AES加解密C语言实现(任意文件长度)
C#实现AES加密--解密
C#实现AES加密--解密///<summary>/// AES 加密///</summary>///<param name="str">明⽂（待加密）</param>///<param name="key">密⽂</param>///<returns></returns>public static string AesEncrypt(string str, string key){if (string.IsNullOrEmpty(str)) return null;Byte[] toEncryptArray = Encoding.UTF8.GetBytes(str);System.Security.Cryptography.RijndaelManaged rm = new System.Security.Cryptography.RijndaelManaged {Key = Encoding.UTF8.GetBytes(key),Mode = System.Security.Cryptography.CipherMode.ECB,Padding = System.Security.Cryptography.PaddingMode.PKCS7};System.Security.Cryptography.ICryptoTransform cTransform = rm.CreateEncryptor();Byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);return Convert.ToBase64String(resultArray, 0, resultArray.Length);}///<summary>/// AES 解密///</summary>///<param name="str">明⽂（待解密）</param>///<param name="key">密⽂</param>///<returns></returns>public static string AesDecrypt(string str, string key){if (string.IsNullOrEmpty(str)) return null;Byte[] toEncryptArray = Convert.FromBase64String(str);System.Security.Cryptography.RijndaelManaged rm = new System.Security.Cryptography.RijndaelManaged {Key = Encoding.UTF8.GetBytes(key),Mode = System.Security.Cryptography.CipherMode.ECB,Padding = System.Security.Cryptography.PaddingMode.PKCS7};System.Security.Cryptography.ICryptoTransform cTransform = rm.CreateDecryptor();Byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);return Encoding.UTF8.GetString(resultArray);}欢迎评论。
C语言利用OpenSSL实现AES加解密源代码
#include <stdlib.h>#include <stdio.h>#include <iostream>#include <string>#include <cassert>#include <Windows.h>#include <tchar.h>#include <conio.h>#include <openssl\aes.h>#include <openssl\rand.h>#include <openssl\evp.h>#pragma comment(lib,"libeay32.lib")#pragma comment(lib,"ssleay32.lib")#define BIG_TEST_SIZE 10240using namespace std;std::string EncodeAES( /*const std::string&*/char * strPassword, const std::string& strData){AES_KEY aes_key;if (AES_set_encrypt_key((const unsigned char*)strPassword, AES_BLOCK_SIZE * 8/*strlen(strPassword)*8 *//*strPassword.length() * 8*/, &aes_key) < 0){assert(false);return "";}std::string strRet;for (unsigned int i = 0; i < strData.length() / AES_BLOCK_SIZE; i++){std::string str16 = strData.substr(i*AES_BLOCK_SIZE, AES_BLOCK_SIZE);unsigned char out[AES_BLOCK_SIZE];AES_encrypt((const unsigned char*)str16.c_str(), out, &aes_key);strRet += std::string((const char*)out, AES_BLOCK_SIZE);}return strRet;}std::string EncodeAES_little( /*const std::string&*/char * strPassword, const std::string& strData) {AES_KEY aes_key;if (AES_set_encrypt_key((const unsigned char*)strPassword, AES_BLOCK_SIZE * 8/*strlen(strPassword)*8*/ /*strPassword.length() * 8*/, &aes_key) < 0)assert(false);return "";}unsigned char out[AES_BLOCK_SIZE];AES_encrypt((const unsigned char*)strData.c_str(), out, &aes_key);return std::string((const char*)out);}std::string EncodeAES_Big( /*const std::string&*/char * strPassword, const std::string& strData) {AES_KEY aes_key;if (AES_set_encrypt_key((const unsigned char*)strPassword, AES_BLOCK_SIZE * 8/*strlen(strPassword)*8 *//*strPassword.length() * 8*/, &aes_key) < 0){assert(false);return "";}std::string strRet;unsigned int i = 0;std::string str16;unsigned char out[AES_BLOCK_SIZE];for (; i < strData.length() / AES_BLOCK_SIZE; i++){str16 = strData.substr(i*AES_BLOCK_SIZE, AES_BLOCK_SIZE);AES_encrypt((const unsigned char*)str16.c_str(), out, &aes_key);strRet += std::string((const char*)out, AES_BLOCK_SIZE);}str16 = strData.substr(i*AES_BLOCK_SIZE, strData.length() - i*AES_BLOCK_SIZE);AES_encrypt((const unsigned char*)str16.c_str(), out, &aes_key);strRet += std::string((const char*)out, AES_BLOCK_SIZE);cout << "*************:" << str16 << endl;cout << "strRet.length() = " << strRet.length() << endl;return strRet;}std::string DecodeAES( /*const std::string&*/char * strPassword, const std::string& strData){AES_KEY aes_key;if (AES_set_decrypt_key((const unsigned char*)strPassword, AES_BLOCK_SIZE * 8/*strlen(strPassword)*8*/ /*strPassword.length() * 8*/, &aes_key) < 0)assert(false);return "";}std::string strRet;for (unsigned int i = 0; i < strData.length() / AES_BLOCK_SIZE; i++){std::string str16 = strData.substr(i*AES_BLOCK_SIZE, AES_BLOCK_SIZE);unsigned char out[AES_BLOCK_SIZE];AES_decrypt((const unsigned char*)str16.c_str(), out, &aes_key);strRet += std::string((const char*)out, AES_BLOCK_SIZE);}return strRet;}std::string DecodeAES_little( /*const std::string&*/char * strPassword, const std::string& strData) {AES_KEY aes_key;if (AES_set_decrypt_key((const unsigned char*)strPassword, AES_BLOCK_SIZE * 8/*strlen(strPassword)*8*/ /*strPassword.length() * 8*/, &aes_key) < 0){assert(false);return "";}unsigned char out[AES_BLOCK_SIZE];AES_decrypt((const unsigned char*)strData.c_str(), out, &aes_key);return std::string((const char*)out);}std::string DecodeAES_Big( /*const std::string&*/char * strPassword, const std::string& strData) {cout << "strData.length() = " << strData.length() << endl;AES_KEY aes_key;if (AES_set_decrypt_key((const unsigned char*)strPassword, AES_BLOCK_SIZE * 8/*strlen(strPassword)*8*/ /*strPassword.length() * 8*/, &aes_key) < 0){assert(false);return "";}std::string strRet;unsigned int i = 0;unsigned char out[AES_BLOCK_SIZE];for (; i < strData.length() / AES_BLOCK_SIZE; i++){std::string str16 = strData.substr(i*AES_BLOCK_SIZE, AES_BLOCK_SIZE);AES_decrypt((const unsigned char*)str16.c_str(), out, &aes_key);strRet += std::string((const char*)out, AES_BLOCK_SIZE);}std::string str16 = strData.substr(i*AES_BLOCK_SIZE, strData.length() - i*AES_BLOCK_SIZE);AES_decrypt((const unsigned char*)str16.c_str(), out, &aes_key);strRet += std::string((const char*)out, AES_BLOCK_SIZE);return strRet;}int main(int argc, _TCHAR* argv[]){system("cls");std::string buf;cout << "请输入待加密字符串:" << endl;getline(cin, buf);char userkey[AES_BLOCK_SIZE];//std::string userkey;RAND_pseudo_bytes((unsigned char*)userkey, sizeof userkey);std::string encrypt_data;std::string decrypt_data;cout << "输入的字符串长度与16比较大小:" << endl;if (buf.length() % 16 == 0){cout << "等于16 " << endl;encrypt_data = EncodeAES(userkey, buf);cout << "加密:" << endl;cout << encrypt_data << endl;decrypt_data = DecodeAES(userkey, encrypt_data);cout << "解密:" << endl;cout << decrypt_data << endl;}else{if (buf.length()<16){cout << "小于16 " << endl;encrypt_data = EncodeAES_little(userkey, buf);cout << "加密:" << endl;cout << encrypt_data << endl;decrypt_data = DecodeAES_little(userkey, encrypt_data);cout << "解密:" << endl;cout << decrypt_data << endl;}else{cout << "大于16 " << endl;encrypt_data = EncodeAES_Big(userkey, buf);cout << "加密:" << endl;cout << encrypt_data << endl;decrypt_data = DecodeAES_Big(userkey, encrypt_data);cout << "解密:" << endl;cout << decrypt_data << endl;}}getchar();return 0;}。
AES加解密C语言程序
0x34,0x8e,0x43,0x44,0xc4,0xde,0xe9,0xcb, 0x54,0x7b,0x94,0x32,0xa6,0xc2,0x23,0x3d, 0xee,0x4c,0x95,0x0b,0x42,0xfa,0xc3,0xe4, 0x08,0x2e,0xa1,0x66,0x28,0xd9,0x24,0xb2, 0x76,0x5b,0xa2,0x49,0x6d,0x8b,0xd1,0x25, 0x72,0xf8,0xf6,0x64,0x86,0x68,0x98,0x16, 0xd4,0xa4,0x5c,0xcc,0x5d,0x65,0xb6,0x92, 0x6c,0x70,0x48,0x50,0xfd,0xed,0xb9,0xda, 0x5e,0x15,0x46,0x57,0xa7,0x8d,0x9d,0x84, 0x90,0xd8,0xab,0x00,0x8c,0xbc,0xd3,0x0a, 0xf7,0xe4,0x58,0x05,0xb8,0xb3,0x45,0x06, 0xd0,0x2c,0x1e,0x8f,0xca,0x3f,0x0f,0x02, 0xc1,0xaf,0xbd,0x03,0x01,0x13,0x8a,0x6b, 0x3a,0x91,0x11,0x41,0x4f,0x67,0xdc,0xea, 0x97,0xf2,0xcf,0xce,0xf0,0xb4,0xe6,0x73, 0x96,0xac,0x74,0x22,0xe7,0xad,0x35,0x85, 0xe2,0xf9,0x37,0xe8,0x1c,0x75,0xdf,0x6e, 0x47,0xf1,0x1a,0x71,0x1d,0x29,0xc5,0x89, 0x6f,0xb7,0x62,0x0e,0xaa,0x18,0xbe,0x1b, 0xfc,0x56,0x3e,0x4b,0xc6,0xd2,0x79,0x20, 0x9a,0xdb,0xc0,0xfe,0x78,0xcd,0x5a,0xf4, 0x1f,0xdd,0xa8,0x33,0x88,0x07,0xc7,0x31, 0xb1,0x12,0x10,0x59,0x27,0x80,0xec,0x5f, 0x60,0x51,0x7f,0xa9,0x19,0xb5,0x4a,0x0d, 0x2d,0xe5,0x7a,0x9f,0x93,0xc9,0x9c,0xef, 0xa0,0xe0,0x3b,0x4d,0xae,0x2a,0xf5,0xb0, 0xc8,0xeb,0xbb,0x3c,0x83,0x53,0x99,0x61, 0x17,0x2b,0x04,0x7e,0xba,0x77,0xd6,0x26, 0xe1,0x69,0x14,0x63,0x55,0x21,0x0c,0x7d, }; /*The key schedule rcon table*/ static const unsigned char Rcon[10]={ 0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80,0x1b,0x36};
基于C++的 AES加密和解密代码
///////////头文件-------begin-----------------------------------------#ifndef AES_H_#define AES_H_#include <string>using std::string;////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////class AES{public:AES();//AES(const char *cchKey);~AES();public://加密文件数据int EncryptFile(const char *cszpSourceFileName,const char *cszpPwdFileName,const char *cszpKey);//解密文件数据int DecryptFile(const char *cszpPwdFileName,const char *cszpResultFileName,const char *cszpKey);//加密字符串string EncryptText(const char *pszInText,const char *cszpKey);//解密字符串string DecryptText(const char *pszInText,const char *cszpKey);//备份数据int BackUp(const char *cszpData, const char *cszpKey, const char *cszpFileName);//恢复备份的数据string Recover(const char *cszpKey, const char *cszpFileName);private:int ByteToBit(char ch,char bit[8]);int BitToByte(char bit[8],char *ch);int Char8ToBit64(char ch[8],char bit[64]);int Bit64ToChar8(char bit[64],char ch[8]);int DES_MakeSubKeys(char key[64],char subKeys[16][48]);int DES_PC1_Transform(char key[64], char tempbts[56]);int DES_PC2_Transform(char key[56], char tempbts[48]);int DES_ROL(char data[56], int time);int DES_IP_Transform(char data[64]);int DES_IP_1_Transform(char data[64]);int DES_E_Transform(char data[48]);int DES_P_Transform(char data[32]);int DES_SBOX(char data[48]);int DES_XOR(char R[48], char L[48],int count);int DES_Swap(char left[32],char right[32]);int DES_EncryptBlock(char plainBlock[8], char subKeys[16][48], char cipherBlock[8]);int DES_DecryptBlock(char cipherBlock[8], char subKeys[16][48], char plainBlock[8]); };#endif /* AES_H_ *////////////头文件-------end-----------------------------------------//以下是实现文件#include "stdafx.h"#include <string>#include <stdio.h>#include <memory.h>#include <time.h>#include <stdlib.h>#include "AES.h"using namespace std;#define PLAIN_FILE_OPEN_ERROR -1#define KEY_FILE_OPEN_ERROR -2#define CIPHER_FILE_OPEN_ERROR -3#define OK 1#define PARAM_ERROR -1///////////////////////////////////////////////////////////////////////////*初始置换表IP*/int IP_Table[64] = { 57,49,41,33,25,17,9,1,59,51,43,35,27,19,11,3,61,53,45,37,29,21,13,5,63,55,47,39,31,23,15,7,56,48,40,32,24,16,8,0,58,50,42,34,26,18,10,2,60,52,44,36,28,20,12,4,62,54,46,38,30,22,14,6};/*逆初始置换表IP^-1*/int IP_1_Table[64] = {39,7,47,15,55,23,63,31,38,6,46,14,54,22,62,30,37,5,45,13,53,21,61,29,36,4,44,12,52,20,60,28,35,3,43,11,51,19,59,27,34,2,42,10,50,18,58,26,33,1,41,9,49,17,57,25,32,0,40,8,48,16,56,24};/*扩充置换表E*/int E_Table[48] = {31, 0, 1, 2, 3, 4,3, 4, 5, 6, 7, 8,7, 8,9,10,11,12,11,12,13,14,15,16,15,16,17,18,19,20,19,20,21,22,23,24,23,24,25,26,27,28,27,28,29,30,31, 0};/*置换函数P*/int P_Table[32] = {15,6,19,20,28,11,27,16,0,14,22,25,4,17,30,9,1,7,23,13,31,26,2,8,18,12,29,5,21,10,3,24};/*S盒*/int S[8][4][16] =/*S1*/{{{14,4,13,1,2,15,11,8,3,10,6,12,5,9,0,7}, {0,15,7,4,14,2,13,1,10,6,12,11,9,5,3,8}, {4,1,14,8,13,6,2,11,15,12,9,7,3,10,5,0}, {15,12,8,2,4,9,1,7,5,11,3,14,10,0,6,13}}, /*S2*/{{15,1,8,14,6,11,3,4,9,7,2,13,12,0,5,10}, {3,13,4,7,15,2,8,14,12,0,1,10,6,9,11,5}, {0,14,7,11,10,4,13,1,5,8,12,6,9,3,2,15}, {13,8,10,1,3,15,4,2,11,6,7,12,0,5,14,9}}, /*S3*/{{10,0,9,14,6,3,15,5,1,13,12,7,11,4,2,8}, {13,7,0,9,3,4,6,10,2,8,5,14,12,11,15,1}, {13,6,4,9,8,15,3,0,11,1,2,12,5,10,14,7}, {1,10,13,0,6,9,8,7,4,15,14,3,11,5,2,12}}, /*S4*/{{7,13,14,3,0,6,9,10,1,2,8,5,11,12,4,15}, {13,8,11,5,6,15,0,3,4,7,2,12,1,10,14,9}, {10,6,9,0,12,11,7,13,15,1,3,14,5,2,8,4}, {3,15,0,6,10,1,13,8,9,4,5,11,12,7,2,14}}, /*S5*/{{2,12,4,1,7,10,11,6,8,5,3,15,13,0,14,9}, {14,11,2,12,4,7,13,1,5,0,15,10,3,9,8,6}, {4,2,1,11,10,13,7,8,15,9,12,5,6,3,0,14}, {11,8,12,7,1,14,2,13,6,15,0,9,10,4,5,3}}, /*S6*/{{12,1,10,15,9,2,6,8,0,13,3,4,14,7,5,11}, {10,15,4,2,7,12,9,5,6,1,13,14,0,11,3,8}, {9,14,15,5,2,8,12,3,7,0,4,10,1,13,11,6}, {4,3,2,12,9,5,15,10,11,14,1,7,6,0,8,13}}, /*S7*/{{4,11,2,14,15,0,8,13,3,12,9,7,5,10,6,1}, {13,0,11,7,4,9,1,10,14,3,5,12,2,15,8,6}, {1,4,11,13,12,3,7,14,10,15,6,8,0,5,9,2}, {6,11,13,8,1,4,10,7,9,5,0,15,14,2,3,12}}, /*S8*/{{13,2,8,4,6,15,11,1,10,9,3,14,5,0,12,7}, {1,15,13,8,10,3,7,4,12,5,6,11,0,14,9,2},{7,11,4,1,9,12,14,2,0,6,10,13,15,3,5,8},{2,1,14,7,4,10,8,13,15,12,9,0,3,5,6,11}}};/*置换选择1*/int PC_1[56] = {56,48,40,32,24,16,8,0,57,49,41,33,25,17,9,1,58,50,42,34,26,18,10,2,59,51,43,35,62,54,46,38,30,22,14,6,61,53,45,37,29,21,13,5,60,52,44,36,28,20,12,4,27,19,11,3};/*置换选择2*/int PC_2[48] = {13,16,10,23,0,4,2,27,14,5,20,9,22,18,11,3,25,7,15,6,26,19,12,1,40,51,30,36,46,54,29,39,50,44,32,46,43,48,38,55,33,52,45,41,49,35,28,31};/*对左移次数的规定*/int MOVE_TIMES[16] = {1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};//////////////////////////////////////////////////////////////////////////AES::AES(){}// AES::AES(const char *cchKey)// {//// }AES::~AES(){}/*字节转换成二进制*/int AES::ByteToBit(char ch, char bit[8]){if (bit == NULL){return PARAM_ERROR;}int cnt = 0;for(cnt = 0;cnt < 8; cnt++){*(bit+cnt) = (ch>>cnt)&1;}return 0;}/*二进制转换成字节*/int AES::BitToByte(char bit[8],char *ch){ if ((ch == NULL) || (bit == NULL)){return PARAM_ERROR;}int cnt = 0;for(cnt = 0;cnt < 8; cnt++){*ch |= *(bit + cnt)<<cnt;}return 0;}/*将长度为8的字符串转为二进制位串*/ int AES::Char8ToBit64(char ch[8],char bit[64]){ if ((ch == NULL) || (bit == NULL)){return PARAM_ERROR;}int cnt = 0;for(cnt = 0; cnt < 8; cnt++){ByteToBit(*(ch+cnt),bit+(cnt<<3));}return 0;}/*将二进制位串转为长度为8的字符串*/ int AES::Bit64ToChar8(char bit[64],char ch[8]){ if ((ch == NULL) || (bit == NULL)){return PARAM_ERROR;}int cnt = 0;memset(ch,0,8);for(cnt = 0; cnt < 8; cnt++){BitToByte(bit+(cnt<<3),ch+cnt);}return 0;}/*生成子密钥*/int AES::DES_MakeSubKeys(char key[64],char subKeys[16][48]){if ((key == NULL) || (subKeys == NULL)){return PARAM_ERROR;}char temp[56] = {0};int cnt = 0;if(DES_PC1_Transform(key,temp) < 0)/*PC1置换*/{return -2;}for(cnt = 0; cnt < 16; cnt++){/*16轮跌代，产生16个子密钥*/DES_ROL(temp,MOVE_TIMES[cnt]);/*循环左移*/DES_PC2_Transform(temp,subKeys[cnt]);/*PC2置换，产生子密钥*/ }return 0;}/*密钥置换1*/int AES::DES_PC1_Transform(char key[64], char tempbts[56]){if ((key == NULL) || (tempbts == NULL)){return PARAM_ERROR;}int cnt = 0;for(cnt = 0; cnt < 56; cnt++){tempbts[cnt] = key[PC_1[cnt]];}return 0;}/*密钥置换2*/int AES::DES_PC2_Transform(char key[56], char tempbts[48]){if ((key == NULL) || (tempbts == NULL)){return PARAM_ERROR;}int cnt = 0;for(cnt = 0; cnt < 48; cnt++){tempbts[cnt] = key[PC_2[cnt]];}return 0;}/*循环左移*/int AES::DES_ROL(char data[56], int time){ if ((data == NULL) || (time < 0)){return PARAM_ERROR;}char temp[56] = {0};/*保存将要循环移动到右边的位*/memcpy(temp,data,time);memcpy(temp+time,data+28,time);/*前28位移动*/memcpy(data,data+time,28-time);memcpy(data+28-time,temp,time);/*后28位移动*/memcpy(data+28,data+28+time,28-time);memcpy(data+56-time,temp+time,time);return 0;}/*IP置换*/int AES::DES_IP_Transform(char data[64]){ if (data == NULL){return PARAM_ERROR;}int cnt = 0;char temp[64] = {0};for(cnt = 0; cnt < 64; cnt++){temp[cnt] = data[IP_Table[cnt]];}memcpy(data,temp,64);return 0;}/*IP逆置换*/int AES::DES_IP_1_Transform(char data[64]){ if (data == NULL){return PARAM_ERROR;}int cnt = 0;char temp[64] = {0};for(cnt = 0; cnt < 64; cnt++){temp[cnt] = data[IP_1_Table[cnt]];}memcpy(data,temp,64);return 0;}/*扩展置换*/int AES::DES_E_Transform(char data[48]){ if (data == NULL){return PARAM_ERROR;}int cnt = 0;char temp[48] = {0};for(cnt = 0; cnt < 48; cnt++){temp[cnt] = data[E_Table[cnt]];}memcpy(data,temp,48);return 0;}/*P置换*/int AES::DES_P_Transform(char data[32]){ if (data == NULL){return PARAM_ERROR;}int cnt = 0;char temp[32] = {0};for(cnt = 0; cnt < 32; cnt++){temp[cnt] = data[P_Table[cnt]];}memcpy(data,temp,32);return 0;}/*异或*/int AES::DES_XOR(char R[48], char L[48] ,int count){ if ((R == NULL) || (L == NULL)){return PARAM_ERROR;}int cnt = 0;for(cnt = 0; cnt < count; cnt++){R[cnt] ^= L[cnt];}return 0;}/*S盒置换*/int AES::DES_SBOX(char data[48]){if(data == NULL){return PARAM_ERROR;}int cnt = 0;int line = 0;int row = 0;int output = 0;int cur1 = 0,cur2 = 0;for(cnt = 0; cnt < 8; cnt++){cur1 = cnt*6;cur2 = cnt<<2;/*计算在S盒中的行与列*/line = (data[cur1]<<1) + data[cur1+5];row = (data[cur1+1]<<3) + (data[cur1+2]<<2)+ (data[cur1+3]<<1) + data[cur1+4];output = S[cnt][line][row];/*化为2进制*/data[cur2] = (output&0X08)>>3;data[cur2+1] = (output&0X04)>>2;data[cur2+2] = (output&0X02)>>1;data[cur2+3] = output&0x01;}return 0;}/*交换*/int AES::DES_Swap(char left[32], char right[32]){if((left == NULL) || (right == NULL)){return PARAM_ERROR;}char temp[32] = {0};memcpy(temp,left,32);memcpy(left,right,32);memcpy(right,temp,32);return 0;}/*加密单个分组*/int AES::DES_EncryptBlock(char plainBlock[8], char subKeys[16][48], char cipherBlock[8]){if((plainBlock == NULL) || (subKeys == NULL) || (cipherBlock == NULL)){return PARAM_ERROR;}char plainBits[64] = {0};char copyRight[48] = {0};int cnt = 0;Char8ToBit64(plainBlock,plainBits);/*初始置换（IP置换）*/DES_IP_Transform(plainBits);/*16轮迭代*/for(cnt = 0; cnt < 16; cnt++){memcpy(copyRight,plainBits+32,32);/*将右半部分进行扩展置换，从32位扩展到48位*/DES_E_Transform(copyRight);/*将右半部分与子密钥进行异或操作*/DES_XOR(copyRight,subKeys[cnt],48);/*异或结果进入S盒，输出32位结果*/DES_SBOX(copyRight);/*P置换*/DES_P_Transform(copyRight);/*将明文左半部分与右半部分进行异或*/DES_XOR(plainBits,copyRight,32);if(cnt != 15){/*最终完成左右部的交换*/DES_Swap(plainBits,plainBits+32);}}/*逆初始置换（IP^1置换）*/DES_IP_1_Transform(plainBits);Bit64ToChar8(plainBits,cipherBlock);return 0;}/*解密单个分组*/int AES::DES_DecryptBlock(char cipherBlock[8], char subKeys[16][48],char plainBlock[8]){ if((plainBlock == NULL) || (subKeys == NULL) || (cipherBlock == NULL)){return PARAM_ERROR;}char cipherBits[64] = {0};char copyRight[48] = {0};int cnt = 0;Char8ToBit64(cipherBlock,cipherBits);/*初始置换（IP置换）*/DES_IP_Transform(cipherBits);/*16轮迭代*/for(cnt = 15; cnt >= 0; cnt--){memcpy(copyRight,cipherBits+32,32);/*将右半部分进行扩展置换，从32位扩展到48位*/DES_E_Transform(copyRight);/*将右半部分与子密钥进行异或操作*/DES_XOR(copyRight,subKeys[cnt],48);/*异或结果进入S盒，输出32位结果*/DES_SBOX(copyRight);/*P置换*/DES_P_Transform(copyRight);/*将明文左半部分与右半部分进行异或*/DES_XOR(cipherBits,copyRight,32);if(cnt != 0){/*最终完成左右部的交换*/DES_Swap(cipherBits,cipherBits+32);}}/*逆初始置换（IP^1置换）*/DES_IP_1_Transform(cipherBits);Bit64ToChar8(cipherBits,plainBlock);return 0;}/*功能：加密文件参数：[cszpSourceFileName]:原数据文件名[cszpPwdFileName]:密码文件名[cszpKey]:密码*/int AES::EncryptFile(const char *cszpSourceFileName,const char *cszpPwdFileName,const char *cszpKey){if ((cszpSourceFileName == NULL) ||(cszpPwdFileName == NULL) ||(cszpKey == NULL)){return PARAM_ERROR;}FILE *plain = NULL,*cipher = NULL;int count = 0;char plainBlock[8] = {0};char cipherBlock[8] = {0};char keyBlock[8] = {0};char bKey[64] = {0};char subKeys[16][48] = {0};if((plain = fopen(cszpSourceFileName,("rb"))) == NULL){ return PLAIN_FILE_OPEN_ERROR;}if((cipher = fopen(cszpPwdFileName,"wb")) == NULL){ return CIPHER_FILE_OPEN_ERROR;}/*设置密钥*/memcpy(keyBlock,cszpKey,8);/*将密钥转换为二进制流*/Char8ToBit64(keyBlock,bKey);/*生成子密钥*/DES_MakeSubKeys(bKey,subKeys);while(!feof(plain)){/*每次读8个字节，并返回成功读取的字节数*/if((count = fread(plainBlock,sizeof(char),8,plain)) == 8){DES_EncryptBlock(plainBlock,subKeys,cipherBlock);fwrite(cipherBlock,sizeof(char),8,cipher);}}if(count){/*填充*/memset(plainBlock + count,'\0',7 - count);/*最后一个字符保存包括最后一个字符在内的所填充的字符数量*/plainBlock[7] = 8 - count;DES_EncryptBlock(plainBlock,subKeys,cipherBlock);fwrite(cipherBlock,sizeof(char),8,cipher);}fclose(plain);plain = NULL;fclose(cipher);cipher = NULL;return OK;}/*功能：解密文件参数：[cszpPwdFileName]:密码文件名[cszpResultFileName]:解密后数据文件名[cszpKey]:密码*/int AES::DecryptFile(const char *cszpPwdFileName,const char *cszpResultFileName,const char *cszpKey){if ((cszpResultFileName == NULL) ||(cszpPwdFileName == NULL) ||(cszpKey == NULL)){return PARAM_ERROR;}FILE *plain = NULL, *cipher = NULL;int count,times = 0;long fileLen = 0;char plainBlock[8] = {0};char cipherBlock[8] = {0};char keyBlock[8] = {0};char bKey[64] = {0};char subKeys[16][48] = {0};if((cipher = fopen(cszpPwdFileName,"rb")) == NULL){ return CIPHER_FILE_OPEN_ERROR;}if((plain = fopen(cszpResultFileName,"wb")) == NULL){ return PLAIN_FILE_OPEN_ERROR;}/*设置密钥*/memcpy(keyBlock,cszpKey,8);/*将密钥转换为二进制流*/Char8ToBit64(keyBlock,bKey);/*生成子密钥*/DES_MakeSubKeys(bKey,subKeys);/*取文件长度*/fseek(cipher,0,SEEK_END);/*将文件指针置尾*/ fileLen = ftell(cipher); /*取文件指针当前位置*/ rewind(cipher); /*将文件指针重指向文件头*/while(1){/*密文的字节数一定是8的整数倍*/fread(cipherBlock,sizeof(char),8,cipher);DES_DecryptBlock(cipherBlock,subKeys,plainBlock);times += 8;if(times < fileLen){fwrite(plainBlock,sizeof(char),8,plain);}else{break;}}/*判断末尾是否被填充*/if(plainBlock[7] < 8){for(count = 8 - plainBlock[7]; count < 7; count++){if(plainBlock[count] != '\0'){break;}}}if(count == 7){/*有填充*/fwrite(plainBlock,sizeof(char),8 - plainBlock[7],plain);}else{/*无填充*/fwrite(plainBlock,sizeof(char),8,plain);}fclose(plain);plain = NULL;fclose(cipher);cipher = NULL;return OK;}/*功能：加密字符串参数：[pszInText]:要加密的字符串[cszpKey]:密码*/string AES::EncryptText(const char *pszInText,const char *cszpKey){if ((pszInText == NULL) ||(cszpKey == NULL)){return "";}int count = 0;char plainBlock[9] = {0};char cipherBlock[9] = {0};char keyBlock[9] = {0};char bKey[64] = {0};char subKeys[16][48] = {0};int nSize = strlen(pszInText);char *pchData = (char *)malloc(nSize + 1);if (pchData == NULL){return "";}memset(pchData, 0, nSize + 1);memcpy(pchData, pszInText, nSize);/*设置密钥*/memcpy(keyBlock,cszpKey,8);/*将密钥转换为二进制流*/Char8ToBit64(keyBlock,bKey);/*生成子密钥*/DES_MakeSubKeys(bKey,subKeys);string strData;char *pch = pchData;do{memset(plainBlock, 0, 9);memcpy(plainBlock, pch, 8);int nLen = strlen(plainBlock);if (nLen < 8){count = nLen;break;}else{DES_EncryptBlock(plainBlock,subKeys,cipherBlock);strData += cipherBlock;pch += 8;}} while (true);if(count){/*填充*/memset(plainBlock + count,'\0',7 - count);/*最后一个字符保存包括最后一个字符在内的所填充的字符数量*/ plainBlock[7] = 8 - count;DES_EncryptBlock(plainBlock,subKeys,cipherBlock);strData += cipherBlock;}return strData;}/*功能：解密字符串参数：[pszInText]:要解密的字符串，即加密后的字符串[cszpKey]:密码*/string AES::DecryptText(const char *pszInText,const char *cszpKey) {if ((pszInText == NULL) ||(cszpKey == NULL)){return "";}int count = 0;int times = 0;char plainBlock[9] = {0};char cipherBlock[9] = {0};char keyBlock[9] = {0};char bKey[64] = {0};char subKeys[16][48] = {0};int nSize = strlen(pszInText);char *pchData = (char *)malloc(nSize + 1);if (pchData == NULL){return "";}memset(pchData, 0, nSize + 1);memcpy(pchData, pszInText, nSize);/*设置密钥*/memcpy(keyBlock,cszpKey,8);/*将密钥转换为二进制流*/Char8ToBit64(keyBlock,bKey);/*生成子密钥*/DES_MakeSubKeys(bKey,subKeys);string strData;char *pch = pchData;while(true){/*密文的字节数一定是8的整数倍*/memset(cipherBlock, 0, 9);memset(plainBlock, 0, 9);memcpy(cipherBlock,pch,8);DES_DecryptBlock(cipherBlock,subKeys,plainBlock);times += 8;pch += 8;if(times < nSize){strData += plainBlock;}else{break;}}/*判断末尾是否被填充*/if(plainBlock[7] < 8){for(count = 8 - plainBlock[7]; count < 7; count++){if(plainBlock[count] != '\0'){break;}}}if(count == 7){/*有填充*/memset(cipherBlock, 0, 9);memcpy(cipherBlock,plainBlock,8 - plainBlock[7]);strData += cipherBlock;}else{/*无填充*/memset(cipherBlock, 0, 9);memcpy(cipherBlock,plainBlock,8);strData += cipherBlock;}return strData;}/*功能：备份数据至指定的文件中参数：【cszpData】：要备份的数据【cszpKey】：用于对数据加密的密码【cszpFileName】：保存数据的文件名返回值：成功：大于等于零（>=0）失败：小于零（<0）*/int AES::BackUp(const char *cszpData, const char *cszpKey, const char *cszpFileName) {if ((cszpData == NULL) ||(cszpKey == NULL) ||(cszpFileName == NULL)){return PARAM_ERROR;}string strData = EncryptText(cszpData, cszpKey);if (strData.empty()){return -2;}FILE *pfile = NULL;if((pfile = fopen(cszpFileName,"wb")) == NULL){return CIPHER_FILE_OPEN_ERROR;}fwrite(strData.c_str(), strlen(strData.c_str()), 1, pfile);fclose(pfile);pfile = NULL;return 0;}//恢复备份的数据/*功能：从指定的文件中恢复备份的数据参数：【cszpKey】：用于对数据解密的密码【cszpFileName】：保存数据的文件名返回值：成功：解密后的数据失败：空值*/string AES::Recover(const char *cszpKey, const char *cszpFileName) {if ((cszpKey == NULL) || (cszpFileName == NULL)){return "";}string strData;FILE *pfile = NULL;if ((pfile = fopen(cszpFileName, "rb")) == NULL){return "";}/*取文件长度*/fseek(pfile,0,SEEK_END);/*将文件指针置尾*/long fileLen = ftell(pfile); /*取文件指针当前位置*/rewind(pfile); /*将文件指针重指向文件头*/char *szpFileData = (char *)malloc(fileLen + 1);if (szpFileData == NULL){fclose(pfile);pfile = NULL;return "";}memset(szpFileData, 0, fileLen + 1);fread(szpFileData, fileLen, 1, pfile);fclose(pfile);strData = DecryptText(szpFileData, cszpKey);return strData;}。
AES算法C语言讲解与实现
AES算法C语言讲解与实现
$$AES（Advanced Encryption Standard，高级加密标准）又称Rijndael加密法，是美国联邦政府采用的一种区块加密标准。
AES是一种使用密钥加密的对称性算法，可以使用128位、192位、256位三种长度的密钥，其分组处理的块（block）长度分别为128、192、256bit，由10轮、12轮和14轮加密循环组成，每轮加密循环中采用4
个复合的函数，同时增加密钥的长度。
1.生成口令
首先，在实施AES算法之前，需要生成一个口令，口令是一段由字符
组成的字符串，口令长度需要符合以下要求：128位（16字节），192位（24字节）或256位（32字节）。
2.密钥扩展
由口令生成一系列较长的子密钥。
AES使用一个迭代的函数从口令中
派生出4个较长的密码子串，这些子串以256-bit、192-bit或128-bit
形式组成，此处子串的长度与加密块的长度相同，它们是AES算法执行时
所需要的参数，具体派生步骤可参见下图：
3.加密
AES的加密算法分成10轮，每一轮加密分为三个执行步骤：字节代换、行移位和列混合。
AES解密算法与加密算法一样，也分为10轮，但是解密算法的每一
轮的步骤是加密算法的步骤的逆序。
4.结果
接着加密完成后，AES算法会产生一个新的128位的块作为加密的结果。
AES加密C语言实现代码
#define BPOLY 0x1b //!< Lower 8 bits of (x^8+x^4+x^3+x+1), ie. (x^4+x^3+x+1).#define BLOCKSIZE 16 //!< Block size in number of bytes.#define KEY_COUNT 3#if KEY_COUNT == 1#define KEYBITS 128 //!< Use AES128.#elif KEY_COUNT == 2#define KEYBITS 192 //!< Use AES196.#elif KEY_COUNT == 3#define KEYBITS 256 //!< Use AES256.#else#error Use 1, 2 or 3 keys!#endif#if KEYBITS == 128#define ROUNDS 10 //!< Number of rounds.#define KEYLENGTH 16 //!< Key length in number of bytes.#elif KEYBITS == 192#define ROUNDS 12 //!< Number of rounds.#define KEYLENGTH 24 //!< // Key length in number of bytes.#elif KEYBITS == 256#define ROUNDS 14 //!< Number of rounds.#define KEYLENGTH 32 //!< Key length in number of bytes.#else#error Key must be 128, 192 or 256 bits!#endif#define EXPANDED_KEY_SIZE (BLOCKSIZE * (ROUNDS+1)) //!< 176, 208 or 240 bytes.unsigned char AES_Key_Table[32] ={0xd0, 0x94, 0x3f, 0x8c, 0x29, 0x76, 0x15, 0xd8,0x20, 0x40, 0xe3, 0x27, 0x45, 0xd8, 0x48, 0xad,0xea, 0x8b, 0x2a, 0x73, 0x16, 0xe9, 0xb0, 0x49,0x45, 0xb3, 0x39, 0x28, 0x0a, 0xc3, 0x28, 0x3c,};unsigned char block1[256]; //!< Workspace 1.unsigned char block2[256]; //!< Worksapce 2.unsigned char tempbuf[256];unsigned char *powTbl; //!< Final location of exponentiation lookup table.unsigned char *logTbl; //!< Final location of logarithm lookup table. unsigned char *sBox; //!< Final location of s-box.unsigned char *sBoxInv; //!< Final location of inverse s-box. unsigned char *expandedKey; //!< Final location of expanded key.void CalcPowLog(unsigned char *powTbl, unsigned char *logTbl) {unsigned char i = 0;unsigned char t = 1;do {// Use 0x03 as root for exponentiation and logarithms.powTbl[i] = t;logTbl[t] = i;i++;// Muliply t by 3 in GF(2^8).t ^= (t << 1) ^ (t & 0x80 ? BPOLY : 0);}while( t != 1 ); // Cyclic properties ensure that i < 255.powTbl[255] = powTbl[0]; // 255 = '-0', 254 = -1, etc.}void CalcSBox( unsigned char * sBox ){unsigned char i, rot;unsigned char temp;unsigned char result;// Fill all entries of sBox[].i = 0;do {//Inverse in GF(2^8).if( i > 0 ){temp = powTbl[ 255 - logTbl[i] ];}else{temp = 0;}// Affine transformation in GF(2).result = temp ^ 0x63; // Start with adding a vector in GF(2).for( rot = 0; rot < 4; rot++ ){// Rotate left.temp = (temp<<1) | (temp>>7);// Add rotated byte in GF(2).result ^= temp;}// Put result in table.sBox[i] = result;} while( ++i != 0 );}void CalcSBoxInv( unsigned char * sBox, unsigned char * sBoxInv ) {unsigned char i = 0;unsigned char j = 0;// Iterate through all elements in sBoxInv using i.do {// Search through sBox using j.do {// Check if current j is the inverse of current i.if( sBox[ j ] == i ){// If so, set sBoxInc and indicate search finished.sBoxInv[ i ] = j;j = 255;}} while( ++j != 0 );} while( ++i != 0 );}void CycleLeft( unsigned char * row ){// Cycle 4 bytes in an array left once.unsigned char temp = row[0];row[0] = row[1];row[1] = row[2];row[2] = row[3];row[3] = temp;}void InvMixColumn( unsigned char * column ){unsigned char r0, r1, r2, r3;r0 = column[1] ^ column[2] ^ column[3];r1 = column[0] ^ column[2] ^ column[3];r2 = column[0] ^ column[1] ^ column[3];r3 = column[0] ^ column[1] ^ column[2];column[0] = (column[0] << 1) ^ (column[0] & 0x80 ? BPOLY : 0);column[1] = (column[1] << 1) ^ (column[1] & 0x80 ? BPOLY : 0);column[2] = (column[2] << 1) ^ (column[2] & 0x80 ? BPOLY : 0);column[3] = (column[3] << 1) ^ (column[3] & 0x80 ? BPOLY : 0);r0 ^= column[0] ^ column[1];r1 ^= column[1] ^ column[2];r2 ^= column[2] ^ column[3];r3 ^= column[0] ^ column[3];column[0] = (column[0] << 1) ^ (column[0] & 0x80 ? BPOLY : 0);column[1] = (column[1] << 1) ^ (column[1] & 0x80 ? BPOLY : 0);column[2] = (column[2] << 1) ^ (column[2] & 0x80 ? BPOLY : 0);column[3] = (column[3] << 1) ^ (column[3] & 0x80 ? BPOLY : 0);r0 ^= column[0] ^ column[2];r1 ^= column[1] ^ column[3];r2 ^= column[0] ^ column[2];r3 ^= column[1] ^ column[3];column[0] = (column[0] << 1) ^ (column[0] & 0x80 ? BPOLY : 0);column[1] = (column[1] << 1) ^ (column[1] & 0x80 ? BPOLY : 0);column[2] = (column[2] << 1) ^ (column[2] & 0x80 ? BPOLY : 0);column[3] = (column[3] << 1) ^ (column[3] & 0x80 ? BPOLY : 0);column[0] ^= column[1] ^ column[2] ^ column[3];r0 ^= column[0];r1 ^= column[0];r2 ^= column[0];r3 ^= column[0];column[0] = r0;column[1] = r1;column[2] = r2;column[3] = r3;}void SubBytes( unsigned char * bytes, unsigned char count ){do {*bytes = sBox[ *bytes ]; // Substitute every byte in state.bytes++;} while( --count );}void InvSubBytesAndXOR( unsigned char * bytes, unsigned char * key, unsigned char count ){do {// *bytes = sBoxInv[ *bytes ] ^ *key; // Inverse substitute every byte in state and add key.*bytes = block2[ *bytes ] ^ *key; // Use block2 directly. Increases speed.bytes++;key++;} while( --count );}void InvShiftRows( unsigned char * state ){unsigned char temp;// Note: State is arranged column by column.// Cycle second row right one time.temp = state[ 1 + 3*4 ];state[ 1 + 3*4 ] = state[ 1 + 2*4 ];state[ 1 + 2*4 ] = state[ 1 + 1*4 ];state[ 1 + 1*4 ] = state[ 1 + 0*4 ];state[ 1 + 0*4 ] = temp;// Cycle third row right two times.temp = state[ 2 + 0*4 ];state[ 2 + 0*4 ] = state[ 2 + 2*4 ];state[ 2 + 2*4 ] = temp;temp = state[ 2 + 1*4 ];state[ 2 + 1*4 ] = state[ 2 + 3*4 ];state[ 2 + 3*4 ] = temp;// Cycle fourth row right three times, ie. left once.temp = state[ 3 + 0*4 ];state[ 3 + 0*4 ] = state[ 3 + 1*4 ];state[ 3 + 1*4 ] = state[ 3 + 2*4 ];state[ 3 + 2*4 ] = state[ 3 + 3*4 ];state[ 3 + 3*4 ] = temp;}void InvMixColumns( unsigned char * state ){InvMixColumn( state + 0*4 );InvMixColumn( state + 1*4 );InvMixColumn( state + 2*4 );InvMixColumn( state + 3*4 );}void XORBytes( unsigned char * bytes1, unsigned char * bytes2, unsigned char count ) {do {*bytes1 ^= *bytes2; // Add in GF(2), ie. XOR.bytes1++;bytes2++;} while( --count );}void CopyBytes( unsigned char * to, unsigned char * from, unsigned char count ) {do {*to = *from;to++;from++;} while( --count );}void KeyExpansion( unsigned char * expandedKey ){unsigned char temp[4];unsigned char i;unsigned char Rcon[4] = { 0x01, 0x00, 0x00, 0x00 }; // Round constant.unsigned char * key = AES_Key_Table;// Copy key to start of expanded key.i = KEYLENGTH;do {*expandedKey = *key;expandedKey++;key++;} while( --i );// Prepare last 4 bytes of key in temp.expandedKey -= 4;temp[0] = *(expandedKey++);temp[1] = *(expandedKey++);temp[2] = *(expandedKey++);temp[3] = *(expandedKey++);// Expand key.i = KEYLENGTH;while( i < BLOCKSIZE*(ROUNDS+1) ){// Are we at the start of a multiple of the key size?if( (i % KEYLENGTH) == 0 ){CycleLeft( temp ); // Cycle left once.SubBytes( temp, 4 ); // Substitute each byte.XORBytes( temp, Rcon, 4 ); // Add constant in GF(2).*Rcon = (*Rcon << 1) ^ (*Rcon & 0x80 ? BPOLY : 0);}// Keysize larger than 24 bytes, ie. larger that 192 bits?#if KEYLENGTH > 24// Are we right past a block size?else if( (i % KEYLENGTH) == BLOCKSIZE ) {SubBytes( temp, 4 ); // Substitute each byte.}#endif// Add bytes in GF(2) one KEYLENGTH away.XORBytes( temp, expandedKey - KEYLENGTH, 4 );// Copy result to current 4 bytes.*(expandedKey++) = temp[ 0 ];*(expandedKey++) = temp[ 1 ];*(expandedKey++) = temp[ 2 ];*(expandedKey++) = temp[ 3 ];i += 4; // Next 4 bytes.}}void InvCipher( unsigned char * block, unsigned char * expandedKey ) {unsigned char round = ROUNDS-1;expandedKey += BLOCKSIZE * ROUNDS;XORBytes( block, expandedKey, 16 );expandedKey -= BLOCKSIZE;do {InvShiftRows( block );InvSubBytesAndXOR( block, expandedKey, 16 );expandedKey -= BLOCKSIZE;InvMixColumns( block );} while( --round );InvShiftRows( block );InvSubBytesAndXOR( block, expandedKey, 16 );}void aesDecInit(void){powTbl = block1;logTbl = block2;CalcPowLog( powTbl, logTbl );sBox = tempbuf;CalcSBox( sBox );expandedKey = block1;KeyExpansion( expandedKey );sBoxInv = block2; // Must be block2.CalcSBoxInv( sBox, sBoxInv );}void aesDecrypt( unsigned char * buffer, unsigned char * chainBlock ) {unsigned char temp[ BLOCKSIZE ];CopyBytes( temp, buffer, BLOCKSIZE );InvCipher( buffer, expandedKey );XORBytes( buffer, chainBlock, BLOCKSIZE );CopyBytes( chainBlock, temp, BLOCKSIZE );}unsigned char Multiply( unsigned char num, unsigned char factor ){unsigned char mask = 1;unsigned char result = 0;while( mask != 0 ){// Check bit of factor given by mask.if( mask & factor ){// Add current multiple of num in GF(2).result ^= num;}// Shift mask to indicate next bit.mask <<= 1;// Double num.num = (num << 1) ^ (num & 0x80 ? BPOLY : 0);}return result;}unsigned char DotProduct( unsigned char * vector1, unsigned char * vector2 ) {unsigned char result = 0;result ^= Multiply( *vector1++, *vector2++ );result ^= Multiply( *vector1++, *vector2++ );result ^= Multiply( *vector1++, *vector2++ );result ^= Multiply( *vector1 , *vector2 );return result;}void MixColumn( unsigned char * column ){unsigned char row[8] = {0x02, 0x03, 0x01, 0x01, 0x02, 0x03, 0x01, 0x01};// Prepare first row of matrix twice, to eliminate need for cycling.unsigned char result[4];// Take dot products of each matrix row and the column vector.result[0] = DotProduct( row+0, column );result[1] = DotProduct( row+3, column );result[2] = DotProduct( row+2, column );result[3] = DotProduct( row+1, column );// Copy temporary result to original column.column[0] = result[0];column[1] = result[1];column[2] = result[2];column[3] = result[3];}void MixColumns( unsigned char * state ){MixColumn( state + 0*4 );MixColumn( state + 1*4 );MixColumn( state + 2*4 );MixColumn( state + 3*4 );}void ShiftRows( unsigned char * state ){unsigned char temp;// Note: State is arranged column by column.// Cycle second row left one time.temp = state[ 1 + 0*4 ];state[ 1 + 0*4 ] = state[ 1 + 1*4 ];state[ 1 + 1*4 ] = state[ 1 + 2*4 ];state[ 1 + 2*4 ] = state[ 1 + 3*4 ];state[ 1 + 3*4 ] = temp;// Cycle third row left two times.temp = state[ 2 + 0*4 ];state[ 2 + 0*4 ] = state[ 2 + 2*4 ];state[ 2 + 2*4 ] = temp;temp = state[ 2 + 1*4 ];state[ 2 + 1*4 ] = state[ 2 + 3*4 ];state[ 2 + 3*4 ] = temp;// Cycle fourth row left three times, ie. right once.temp = state[ 3 + 3*4 ];state[ 3 + 3*4 ] = state[ 3 + 2*4 ];state[ 3 + 2*4 ] = state[ 3 + 1*4 ];state[ 3 + 1*4 ] = state[ 3 + 0*4 ];state[ 3 + 0*4 ] = temp;}void Cipher( unsigned char * block, unsigned char * expandedKey ) {unsigned char round = ROUNDS-1;XORBytes( block, expandedKey, 16 );expandedKey += BLOCKSIZE;do {SubBytes( block, 16 );ShiftRows( block );MixColumns( block );XORBytes( block, expandedKey, 16 );expandedKey += BLOCKSIZE;} while( --round );SubBytes( block, 16 );ShiftRows( block );XORBytes( block, expandedKey, 16 );}void aesEncInit(void){powTbl = block1;logTbl = tempbuf;CalcPowLog( powTbl, logTbl );sBox = block2;CalcSBox( sBox );expandedKey = block1;KeyExpansion( expandedKey );}void aesEncrypt( unsigned char * buffer, unsigned char * chainBlock ) {XORBytes( buffer, chainBlock, BLOCKSIZE );Cipher( buffer, expandedKey );CopyBytes( chainBlock, buffer, BLOCKSIZE );}#include <string.h>void AES_Test(void){unsigned char dat[16]="0123456789ABCDEF";unsigned char chainCipherBlock[16];unsigned char i;for(i=0;i<32;i++) AES_Key_Table[i]=i;//做运算之前先要设置好密钥，这里只是设置密钥的DEMO。
AES加密解密C语言实现
快毕业了，最后一个课程设计，《基于Windows Socket的安全通信》，内容就是基于AES加密的SOCKET通信，貌似挺简单，不过要用VC++6.0开发，C++我确实没有任何代码经验，虽然不是强制性，但由于机房里各种纠结，只能用它了（用Java没有挑战性，封装得太好了...也算熟悉下VC++吧）先搞定AES算法，基本变换包括SubBytes（字节替代）、ShiftRows（行移位）、MixColumns（列混淆）、AddRoundKey(轮密钥加）其算法一般描述为明文及密钥的组织排列方式(其中c i是6310即011000112的第i位），用矩阵表示为本来打算把求乘法逆和仿射变换算法敲上去，最后还是放弃了...直接打置换表行移位变换完成基于行的循环位移操作，变换方法：即行移位变换作用于行上，第0行不变，第1行循环左移1个字节，第2行循b(x) = (03·x + 01·x + 01·x + 02) ·a(x) mod(x + 1)矩阵表示形式：其中FFmul为有限域GF(28)上的乘法，标准算法应该是循环8次（b与a的每一位相乘，结果相加），但这里只用到最低2位，解密时用到的逆列混淆也只用了低4位，所以在这里高4位的运算是多余的，只计算低4位。
KeyExpansion（密钥扩展）将输入的密钥扩展为11组128位密钥组，其中第0组为输入密钥本身其后第n组第i列为第n-1组第i列与第n组第i-1列之和（模2加法，1 <= i <=3）对于每一组第一列即i=0，有特殊的处理将前一列即第n-1组第3列的4个字节循环左移1个字节，加密时默认参数length=0,为要加密的数据长度，如果使用默认值，则作为字符串处理，以'\0'为结尾计算长度加密时传进的指针要预留够16整数倍字节的空间，因为加密操作直接修改原数据，不足128位可能造成内存溢出。
AES算法的C语言实现
( (uint32) MUL( 0x0E, y ) << 24 );
RT0[i] &= 0xFFFFFFFF;
RT1[i] = ROTR8( RT0[i] );
0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B,
0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF,
0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, uint32 Fra bibliotekT3[256];
/* reverse S-box & tables */
uint32 RSb[256];
uint32 RT0[256];
uint32 RT1[256];
uint32 RT2[256];
uint32 RT3[256];
/* round constants */
0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76,
0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0,
0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0,
x ^= y; y = ( y << 1 ) | ( y >> 7 );
x ^= y ^ 0x63;
FSb[i] = x;
RSb[x] = i;
}
/* generate the forward and reverse tables */
AES加密和解密文件
AES加密和解密⽂件using System;using System.IO;using System.Security;using System.Security.Cryptography;using System.Runtime.InteropServices;using System.Text;namespace CSEncryptDecrypt{class Class1{// Call this function to remove the key from memory after use for security[System.Runtime.InteropServices.DllImport("KERNEL32.DLL", EntryPoint="RtlZeroMemory")]public static extern bool ZeroMemory(IntPtr Destination, int Length);// Function to Generate a 64 bits Key.static string GenerateKey(){// Create an instance of Symetric Algorithm. Key and IV is generated automatically.DESCryptoServiceProvider desCrypto =(DESCryptoServiceProvider)DESCryptoServiceProvider.Create(); // Use the Automatically generated key for Encryption.return ASCIIEncoding.ASCII.GetString(desCrypto.Key);}static void EncryptFile(string sInputFilename,string sOutputFilename,string sKey){FileStream fsInput = new FileStream(sInputFilename,FileMode.Open,FileAccess.Read);FileStream fsEncrypted = new FileStream(sOutputFilename,FileMode.Create,FileAccess.Write);DESCryptoServiceProvider DES = new DESCryptoServiceProvider();DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);ICryptoTransform desencrypt = DES.CreateEncryptor();CryptoStream cryptostream = new CryptoStream(fsEncrypted,desencrypt,CryptoStreamMode.Write);byte[] bytearrayinput = new byte[fsInput.Length];fsInput.Read(bytearrayinput, 0, bytearrayinput.Length);cryptostream.Write(bytearrayinput, 0, bytearrayinput.Length);cryptostream.Close();fsInput.Close();fsEncrypted.Close();}static void DecryptFile(string sInputFilename,string sOutputFilename,string sKey){DESCryptoServiceProvider DES = new DESCryptoServiceProvider();//A 64 bit key and IV is required for this provider.//Set secret key For DES algorithm.DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);//Set initialization vector.DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);//Create a file stream to read the encrypted file back.FileStream fsread = new FileStream(sInputFilename,FileMode.Open,FileAccess.Read);//Create a DES decryptor from the DES instance.ICryptoTransform desdecrypt = DES.CreateDecryptor();//Create crypto stream set to read and do a//DES decryption transform on incoming bytes.CryptoStream cryptostreamDecr = new CryptoStream(fsread,desdecrypt,CryptoStreamMode.Read);//Print the contents of the decrypted file.StreamWriter fsDecrypted = new StreamWriter(sOutputFilename);fsDecrypted.Write(new StreamReader(cryptostreamDecr).ReadToEnd());fsDecrypted.Flush();fsDecrypted.Close();}static void Main(){// Must be 64 bits, 8 bytes.// Distribute this key to the user who will decrypt this file.string sSecretKey;// Get the Key for the file to Encrypt.sSecretKey = GenerateKey();// For additional security Pin the key.GCHandle gch = GCHandle.Alloc( sSecretKey,GCHandleType.Pinned );// Encrypt the file.EncryptFile(@"C:\MyData.txt",@"C:\Encrypted.txt",sSecretKey);// Decrypt the file.DecryptFile(@"C:\Encrypted.txt",@"C:\Decrypted.txt",sSecretKey);// Remove the Key from memory.ZeroMemory(gch.AddrOfPinnedObject(), sSecretKey.Length * 2);gch.Free();}}}----------------------------------------------------------------------------------------------------------⼤⽂件分块加密和解密using System.Text;using System.Collections;using ponentModel;using System.Data;using ;using .Sockets;using System.Threading;using System.IO;using System.Security.Cryptography;namespace VideoEncrypt{class Program{static void Main(string[] args){RijndaelManaged rij = new RijndaelManaged();rij.KeySize = 128;string fp = @"E://friends//3//3.mkv";string sPhysicalFilePath = @"E://friends//3//o3.mkv";string fw = @"E://friends//3//dd3.mkv";Console.WriteLine("Encrypting begin...");encryption(rij, fp, sPhysicalFilePath);decryption(rij,sPhysicalFilePath,fw);}//⽤于加密的函数public static void encryption(RijndaelManaged rij,string readfile, string writefile){try{byte[] key = rij.Key;byte[] iv = rij.IV;byte[] buffer = new byte[4096];Rijndael crypt = Rijndael.Create();ICryptoTransform transform = crypt.CreateEncryptor(key, iv);//写进⽂件FileStream fswrite = new FileStream(writefile, FileMode.Create);CryptoStream cs = new CryptoStream(fswrite, transform, CryptoStreamMode.Write); //打开⽂件FileStream fsread = new FileStream(readfile, FileMode.Open);int length;//while ((length = fsread.ReadByte()) != -1)//cs.WriteByte((byte)length);while ((length = fsread.Read(buffer, 0, 4096)) > 0)cs.Write(buffer, 0, (int)length);fsread.Close();cs.Close();fswrite.Close();Console.WriteLine("Encrypt Success");}catch (Exception e){Console.WriteLine("Encrypt Faile"+e.ToString());}}//⽤于解密的函数public static void decryption(RijndaelManaged rij, string readfile, string writefile){try{byte[] key = rij.Key;byte[] iv = rij.IV;byte[] buffer=new byte[4096];Rijndael crypt = Rijndael.Create();ICryptoTransform transform = crypt.CreateDecryptor(key, iv);//读取加密后的⽂件FileStream fsopen = new FileStream(readfile, FileMode.Open);CryptoStream cs = new CryptoStream(fsopen, transform, CryptoStreamMode.Read); //把解密后的结果写进⽂件FileStream fswrite = new FileStream(writefile, FileMode.OpenOrCreate);int length;//while ((length = cs.ReadByte()) != -1)//fswrite.WriteByte((byte)length);while ((length = cs.Read(buffer, 0, 4096)) > 0)fswrite.Write(buffer, 0, (int)length);fswrite.Close();cs.Close();fsopen.Close();Console.WriteLine("Decrypt Success");}catch (Exception e){Console.WriteLine("Decrypt Failed"+e.ToString());}}}}。
AES加密C语言实现代码
AES加密C语言实现代码以下是一个简单的C语言实现AES加密算法的代码：```c#include <stdio.h>#include <stdlib.h>#include <stdint.h>//定义AES加密的轮数#define NR 10//定义AES加密的扩展密钥长度#define Nk 4//定义AES加密的行数和列数#define Nb 4//定义AES加密的状态矩阵typedef uint8_t state_t[4][4];//定义AES加密的S盒变换表static const uint8_t sbox[256] =//S盒变换表};//定义AES加密的轮常量表static const uint8_t Rcon[11] =//轮常量表};//定义AES加密的密钥扩展变换函数void KeyExpansion(const uint8_t* key, uint8_t* expandedKey) uint32_t* ek = (uint32_t*)expandedKey;uint32_t temp;//密钥拷贝到扩展密钥中for (int i = 0; i < Nk; i++)ek[i] = (key[4 * i] << 24) ， (key[4 * i + 1] << 16) ，(key[4 * i + 2] << 8) ， (key[4 * i + 3]);}//扩展密钥生成for (int i = Nk; i < Nb * (NR + 1); i++)temp = ek[i - 1];if (i % Nk == 0)//对上一个密钥的字节进行循环左移1位temp = (temp >> 8) ， ((temp & 0xFF) << 24);//对每个字节进行S盒变换temp = (sbox[temp >> 24] << 24) ， (sbox[(temp >> 16) & 0xFF] << 16) ， (sbox[(temp >> 8) & 0xFF] << 8) ， sbox[temp & 0xFF];// 取轮常量Rcontemp = temp ^ (Rcon[i / Nk - 1] << 24);} else if (Nk > 6 && i % Nk == 4)//对每个字节进行S盒变换temp = (sbox[temp >> 24] << 24) ， (sbox[(temp >> 16) & 0xFF] << 16) ， (sbox[(temp >> 8) & 0xFF] << 8) ， sbox[temp & 0xFF];}//生成下一个密钥ek[i] = ek[i - Nk] ^ temp;}//定义AES加密的字节替换函数void SubBytes(state_t* state)for (int i = 0; i < 4; i++)for (int j = 0; j < 4; j++)(*state)[i][j] = sbox[(*state)[i][j]];}}//定义AES加密的行移位函数void ShiftRows(state_t* state) uint8_t temp;//第2行循环左移1位temp = (*state)[1][0];(*state)[1][0] = (*state)[1][1]; (*state)[1][1] = (*state)[1][2]; (*state)[1][2] = (*state)[1][3]; (*state)[1][3] = temp;//第3行循环左移2位temp = (*state)[2][0];(*state)[2][0] = (*state)[2][2]; (*state)[2][2] = temp;temp = (*state)[2][1];(*state)[2][1] = (*state)[2][3]; (*state)[2][3] = temp;//第4行循环左移3位temp = (*state)[3][0];(*state)[3][0] = (*state)[3][3];(*state)[3][3] = (*state)[3][2];(*state)[3][2] = (*state)[3][1];(*state)[3][1] = temp;//定义AES加密的列混淆函数void MixColumns(state_t* state)uint8_t temp, tmp, tm;for (int i = 0; i < 4; i++)tmp = (*state)[i][0];tm = (*state)[i][0] ^ (*state)[i][1] ^ (*state)[i][2] ^ (*state)[i][3] ;temp = (*state)[i][0] ^ (*state)[i][1];(*state)[i][0] ^= temp ^ tm;temp = (*state)[i][1] ^ (*state)[i][2];(*state)[i][1] ^= temp ^ tm;temp = (*state)[i][2] ^ (*state)[i][3];(*state)[i][2] ^= temp ^ tm;temp = (*state)[i][3] ^ tmp;(*state)[i][3] ^= temp ^ tm;}//定义AES加密的轮密钥加函数void AddRoundKey(state_t* state, const uint8_t* roundKey) for (int i = 0; i < 4; i++)for (int j = 0; j < 4; j++)(*state)[j][i] ^= roundKey[i * 4 + j];}}//定义AES加密函数void AES_Encrypt(const uint8_t* plainText, const uint8_t* key, uint8_t* cipherText)state_t* state = (state_t*)cipherText;uint8_t expandedKey[4 * Nb * (NR + 1)];//密钥扩展KeyExpansion(key, expandedKey);//初始化状态矩阵for (int i = 0; i < 4; i++)for (int j = 0; j < 4; j++)(*state)[j][i] = plainText[i * 4 + j];}}//第1轮密钥加AddRoundKey(state, key);//迭代执行第2至第10轮加密for (int round = 1; round < NR; round++) SubBytes(state);ShiftRows(state);MixColumns(state);AddRoundKey(state, expandedKey + round * 16); }//执行第11轮加密SubBytes(state);ShiftRows(state);AddRoundKey(state, expandedKey + NR * 16);int maiuint8_t plainText[16] =//明文数据};uint8_t key[16] =//密钥数据};uint8_t cipherText[16];AES_Encrypt(plainText, key, cipherText);。
C语言利用OpenSSL实现AES加解密源代码
#include <stdlib.h>#include <stdio.h>#include <iostream>#include <string>#include <cassert>#include <Windows.h>#include <tchar.h>#include <conio.h>#include <openssl\aes.h>#include <openssl\rand.h>#include <openssl\evp.h>#pragma comment(lib,"libeay32.lib")#pragma comment(lib,"ssleay32.lib")#define BIG_TEST_SIZE 10240using namespace std;std::string EncodeAES( /*const std::string&*/char * strPassword, const std::string& strData){AES_KEY aes_key;if (AES_set_encrypt_key((const unsigned char*)strPassword, AES_BLOCK_SIZE * 8/*strlen(strPassword)*8 *//*strPassword.length() * 8*/, &aes_key) < 0){assert(false);return "";}std::string strRet;for (unsigned int i = 0; i < strData.length() / AES_BLOCK_SIZE; i++){std::string str16 = strData.substr(i*AES_BLOCK_SIZE, AES_BLOCK_SIZE);unsigned char out[AES_BLOCK_SIZE];AES_encrypt((const unsigned char*)str16.c_str(), out, &aes_key);strRet += std::string((const char*)out, AES_BLOCK_SIZE);}return strRet;}std::string EncodeAES_little( /*const std::string&*/char * strPassword, const std::string& strData) {AES_KEY aes_key;if (AES_set_encrypt_key((const unsigned char*)strPassword, AES_BLOCK_SIZE * 8/*strlen(strPassword)*8*/ /*strPassword.length() * 8*/, &aes_key) < 0)assert(false);return "";}unsigned char out[AES_BLOCK_SIZE];AES_encrypt((const unsigned char*)strData.c_str(), out, &aes_key);return std::string((const char*)out);}std::string EncodeAES_Big( /*const std::string&*/char * strPassword, const std::string& strData) {AES_KEY aes_key;if (AES_set_encrypt_key((const unsigned char*)strPassword, AES_BLOCK_SIZE * 8/*strlen(strPassword)*8 *//*strPassword.length() * 8*/, &aes_key) < 0){assert(false);return "";}std::string strRet;unsigned int i = 0;std::string str16;unsigned char out[AES_BLOCK_SIZE];for (; i < strData.length() / AES_BLOCK_SIZE; i++){str16 = strData.substr(i*AES_BLOCK_SIZE, AES_BLOCK_SIZE);AES_encrypt((const unsigned char*)str16.c_str(), out, &aes_key);strRet += std::string((const char*)out, AES_BLOCK_SIZE);}str16 = strData.substr(i*AES_BLOCK_SIZE, strData.length() - i*AES_BLOCK_SIZE);AES_encrypt((const unsigned char*)str16.c_str(), out, &aes_key);strRet += std::string((const char*)out, AES_BLOCK_SIZE);cout << "*************:" << str16 << endl;cout << "strRet.length() = " << strRet.length() << endl;return strRet;}std::string DecodeAES( /*const std::string&*/char * strPassword, const std::string& strData){AES_KEY aes_key;if (AES_set_decrypt_key((const unsigned char*)strPassword, AES_BLOCK_SIZE * 8/*strlen(strPassword)*8*/ /*strPassword.length() * 8*/, &aes_key) < 0)assert(false);return "";}std::string strRet;for (unsigned int i = 0; i < strData.length() / AES_BLOCK_SIZE; i++){std::string str16 = strData.substr(i*AES_BLOCK_SIZE, AES_BLOCK_SIZE);unsigned char out[AES_BLOCK_SIZE];AES_decrypt((const unsigned char*)str16.c_str(), out, &aes_key);strRet += std::string((const char*)out, AES_BLOCK_SIZE);}return strRet;}std::string DecodeAES_little( /*const std::string&*/char * strPassword, const std::string& strData) {AES_KEY aes_key;if (AES_set_decrypt_key((const unsigned char*)strPassword, AES_BLOCK_SIZE * 8/*strlen(strPassword)*8*/ /*strPassword.length() * 8*/, &aes_key) < 0){assert(false);return "";}unsigned char out[AES_BLOCK_SIZE];AES_decrypt((const unsigned char*)strData.c_str(), out, &aes_key);return std::string((const char*)out);}std::string DecodeAES_Big( /*const std::string&*/char * strPassword, const std::string& strData) {cout << "strData.length() = " << strData.length() << endl;AES_KEY aes_key;if (AES_set_decrypt_key((const unsigned char*)strPassword, AES_BLOCK_SIZE * 8/*strlen(strPassword)*8*/ /*strPassword.length() * 8*/, &aes_key) < 0){assert(false);return "";}std::string strRet;unsigned int i = 0;unsigned char out[AES_BLOCK_SIZE];for (; i < strData.length() / AES_BLOCK_SIZE; i++){std::string str16 = strData.substr(i*AES_BLOCK_SIZE, AES_BLOCK_SIZE);AES_decrypt((const unsigned char*)str16.c_str(), out, &aes_key);strRet += std::string((const char*)out, AES_BLOCK_SIZE);}std::string str16 = strData.substr(i*AES_BLOCK_SIZE, strData.length() - i*AES_BLOCK_SIZE);AES_decrypt((const unsigned char*)str16.c_str(), out, &aes_key);strRet += std::string((const char*)out, AES_BLOCK_SIZE);return strRet;}int main(int argc, _TCHAR* argv[]){system("cls");std::string buf;cout << "请输入待加密字符串:" << endl;getline(cin, buf);char userkey[AES_BLOCK_SIZE];//std::string userkey;RAND_pseudo_bytes((unsigned char*)userkey, sizeof userkey);std::string encrypt_data;std::string decrypt_data;cout << "输入的字符串长度与16比较大小:" << endl;if (buf.length() % 16 == 0){cout << "等于16 " << endl;encrypt_data = EncodeAES(userkey, buf);cout << "加密:" << endl;cout << encrypt_data << endl;decrypt_data = DecodeAES(userkey, encrypt_data);cout << "解密:" << endl;cout << decrypt_data << endl;}else{if (buf.length()<16){cout << "小于16 " << endl;encrypt_data = EncodeAES_little(userkey, buf);cout << "加密:" << endl;cout << encrypt_data << endl;decrypt_data = DecodeAES_little(userkey, encrypt_data);cout << "解密:" << endl;cout << decrypt_data << endl;}else{cout << "大于16 " << endl;encrypt_data = EncodeAES_Big(userkey, buf);cout << "加密:" << endl;cout << encrypt_data << endl;decrypt_data = DecodeAES_Big(userkey, encrypt_data);cout << "解密:" << endl;cout << decrypt_data << endl;}}getchar();return 0;}。
AES加解密算法的C语言实现(VC版)
* 3 pre-rotated to save the ROTL8, ROTL16 and ROTL24 overhead */
void encrypt(char *buff)
{
int i,j,k,m;
WORD a[8],b[8],*x,*y,*t;
for (i=j=0;i<Nb;i++,j+=4)
by=by>>4 &0x0f;
if(by >= 0 && by <= 9)
*str++ = by + '0';
else if(by >= 0x0A && by <= 0x0F)
*str++ = by - 10 + 'A';
by = *hex++;
by=by &0x0f;
if(by >= 0 && by <= 9)
else
return 0;
}
static WORD SubByte(WORD a)
{
BYTE b[4];
unpack(a,b);
b[0]=fbsub[b[0]];
b[1]=fbsub[b[1]];
b[2]=fbsub[b[2]];
b[3]=fbsub[b[3]];
return pack(b);
}
static BYTE product(WORD x,WORD y)
{ /* unpack bytes from a word */
b[0]=(BYTE)a; b[1]=(BYTE)(a>>8);
AES加密算法C++实现
AES加密算法C++实现 我从⽹上下载了⼀套AES加密算法的C++实现，代码如下：（1）aes.h#ifndef SRC_UTILS_AES_H#define SRC_UTILS_AES_Hclass AES{public:AES(unsigned char* key);virtual ~AES();unsigned char* Cipher(unsigned char* input); // 加密，传⼊的数组⼤⼩必须是16字节unsigned char* InvCipher(unsigned char* input); // 解密，传⼊的数组也必须是16字节void* Cipher(void* input, int length=0); // 可以传⼊数组，⼤⼩必须是16的整数倍，如果不是将会越界操作；如果不传length⽽默认为0，那么将按照字符串处理，遇'\0'结束void* InvCipher(void* input, int length); // 必须传⼊数组和⼤⼩，必须是16的整数倍private:unsigned char Sbox[256];unsigned char InvSbox[256];unsigned char w[11][4][4];void KeyExpansion(unsigned char* key, unsigned char w[][4][4]);unsigned char FFmul(unsigned char a, unsigned char b);void SubBytes(unsigned char state[][4]);void ShiftRows(unsigned char state[][4]);void MixColumns(unsigned char state[][4]);void AddRoundKey(unsigned char state[][4], unsigned char k[][4]);void InvSubBytes(unsigned char state[][4]);void InvShiftRows(unsigned char state[][4]);void InvMixColumns(unsigned char state[][4]);};#endif// SRC_UTILS_AES_H（2）aes.cpp1 #include "aes.h"2 #include "string.h"34 AES::AES(unsigned char* key)5 {6 unsigned char sBox[] =7 { /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */80x63,0x7c,0x77,0x7b,0xf2,0x6b,0x6f,0xc5,0x30,0x01,0x67,0x2b,0xfe,0xd7,0xab,0x76, /*0*/90xca,0x82,0xc9,0x7d,0xfa,0x59,0x47,0xf0,0xad,0xd4,0xa2,0xaf,0x9c,0xa4,0x72,0xc0, /*1*/100xb7,0xfd,0x93,0x26,0x36,0x3f,0xf7,0xcc,0x34,0xa5,0xe5,0xf1,0x71,0xd8,0x31,0x15, /*2*/110x04,0xc7,0x23,0xc3,0x18,0x96,0x05,0x9a,0x07,0x12,0x80,0xe2,0xeb,0x27,0xb2,0x75, /*3*/120x09,0x83,0x2c,0x1a,0x1b,0x6e,0x5a,0xa0,0x52,0x3b,0xd6,0xb3,0x29,0xe3,0x2f,0x84, /*4*/130x53,0xd1,0x00,0xed,0x20,0xfc,0xb1,0x5b,0x6a,0xcb,0xbe,0x39,0x4a,0x4c,0x58,0xcf, /*5*/140xd0,0xef,0xaa,0xfb,0x43,0x4d,0x33,0x85,0x45,0xf9,0x02,0x7f,0x50,0x3c,0x9f,0xa8, /*6*/150x51,0xa3,0x40,0x8f,0x92,0x9d,0x38,0xf5,0xbc,0xb6,0xda,0x21,0x10,0xff,0xf3,0xd2, /*7*/160xcd,0x0c,0x13,0xec,0x5f,0x97,0x44,0x17,0xc4,0xa7,0x7e,0x3d,0x64,0x5d,0x19,0x73, /*8*/170x60,0x81,0x4f,0xdc,0x22,0x2a,0x90,0x88,0x46,0xee,0xb8,0x14,0xde,0x5e,0x0b,0xdb, /*9*/180xe0,0x32,0x3a,0x0a,0x49,0x06,0x24,0x5c,0xc2,0xd3,0xac,0x62,0x91,0x95,0xe4,0x79, /*a*/190xe7,0xc8,0x37,0x6d,0x8d,0xd5,0x4e,0xa9,0x6c,0x56,0xf4,0xea,0x65,0x7a,0xae,0x08, /*b*/200xba,0x78,0x25,0x2e,0x1c,0xa6,0xb4,0xc6,0xe8,0xdd,0x74,0x1f,0x4b,0xbd,0x8b,0x8a, /*c*/210x70,0x3e,0xb5,0x66,0x48,0x03,0xf6,0x0e,0x61,0x35,0x57,0xb9,0x86,0xc1,0x1d,0x9e, /*d*/220xe1,0xf8,0x98,0x11,0x69,0xd9,0x8e,0x94,0x9b,0x1e,0x87,0xe9,0xce,0x55,0x28,0xdf, /*e*/230x8c,0xa1,0x89,0x0d,0xbf,0xe6,0x42,0x68,0x41,0x99,0x2d,0x0f,0xb0,0x54,0xbb,0x16/*f*/24 };25 unsigned char invsBox[256] =26 { /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */270x52,0x09,0x6a,0xd5,0x30,0x36,0xa5,0x38,0xbf,0x40,0xa3,0x9e,0x81,0xf3,0xd7,0xfb, /*0*/280x7c,0xe3,0x39,0x82,0x9b,0x2f,0xff,0x87,0x34,0x8e,0x43,0x44,0xc4,0xde,0xe9,0xcb, /*1*/290x54,0x7b,0x94,0x32,0xa6,0xc2,0x23,0x3d,0xee,0x4c,0x95,0x0b,0x42,0xfa,0xc3,0x4e, /*2*/300x08,0x2e,0xa1,0x66,0x28,0xd9,0x24,0xb2,0x76,0x5b,0xa2,0x49,0x6d,0x8b,0xd1,0x25, /*3*/310x72,0xf8,0xf6,0x64,0x86,0x68,0x98,0x16,0xd4,0xa4,0x5c,0xcc,0x5d,0x65,0xb6,0x92, /*4*/320x6c,0x70,0x48,0x50,0xfd,0xed,0xb9,0xda,0x5e,0x15,0x46,0x57,0xa7,0x8d,0x9d,0x84, /*5*/330x90,0xd8,0xab,0x00,0x8c,0xbc,0xd3,0x0a,0xf7,0xe4,0x58,0x05,0xb8,0xb3,0x45,0x06, /*6*/340xd0,0x2c,0x1e,0x8f,0xca,0x3f,0x0f,0x02,0xc1,0xaf,0xbd,0x03,0x01,0x13,0x8a,0x6b, /*7*/350x3a,0x91,0x11,0x41,0x4f,0x67,0xdc,0xea,0x97,0xf2,0xcf,0xce,0xf0,0xb4,0xe6,0x73, /*8*/360x96,0xac,0x74,0x22,0xe7,0xad,0x35,0x85,0xe2,0xf9,0x37,0xe8,0x1c,0x75,0xdf,0x6e, /*9*/370x47,0xf1,0x1a,0x71,0x1d,0x29,0xc5,0x89,0x6f,0xb7,0x62,0x0e,0xaa,0x18,0xbe,0x1b, /*a*/380xfc,0x56,0x3e,0x4b,0xc6,0xd2,0x79,0x20,0x9a,0xdb,0xc0,0xfe,0x78,0xcd,0x5a,0xf4, /*b*/390x1f,0xdd,0xa8,0x33,0x88,0x07,0xc7,0x31,0xb1,0x12,0x10,0x59,0x27,0x80,0xec,0x5f, /*c*/400x60,0x51,0x7f,0xa9,0x19,0xb5,0x4a,0x0d,0x2d,0xe5,0x7a,0x9f,0x93,0xc9,0x9c,0xef, /*d*/410xa0,0xe0,0x3b,0x4d,0xae,0x2a,0xf5,0xb0,0xc8,0xeb,0xbb,0x3c,0x83,0x53,0x99,0x61, /*e*/420x17,0x2b,0x04,0x7e,0xba,0x77,0xd6,0x26,0xe1,0x69,0x14,0x63,0x55,0x21,0x0c,0x7d/*f*/43 };44 memcpy(Sbox, sBox, 256);45 memcpy(InvSbox, invsBox, 256);46 KeyExpansion(key, w);47 }49 AES::~AES()50 {5152 }5354 unsigned char* AES::Cipher(unsigned char* input)55 {56 unsigned char state[4][4];57int i,r,c;5859for(r=0; r<4; r++)60 {61for(c=0; c<4 ;c++)62 {63 state[r][c] = input[c*4+r];64 }65 }6667 AddRoundKey(state,w[0]);6869for(i=1; i<=10; i++)70 {71 SubBytes(state);72 ShiftRows(state);73if(i!=10)MixColumns(state);74 AddRoundKey(state,w[i]);75 }7677for(r=0; r<4; r++)78 {79for(c=0; c<4 ;c++)80 {81 input[c*4+r] = state[r][c];82 }83 }8485return input;86 }8788 unsigned char* AES::InvCipher(unsigned char* input)89 {90 unsigned char state[4][4];91int i,r,c;9293for(r=0; r<4; r++)94 {95for(c=0; c<4 ;c++)96 {97 state[r][c] = input[c*4+r];98 }99 }100101 AddRoundKey(state, w[10]);102for(i=9; i>=0; i--)103 {104 InvShiftRows(state);105 InvSubBytes(state);106 AddRoundKey(state, w[i]);107if(i)108 {109 InvMixColumns(state);110 }111 }112113for(r=0; r<4; r++)114 {115for(c=0; c<4 ;c++)116 {117 input[c*4+r] = state[r][c];118 }119 }120121return input;122 }123124void* AES::Cipher(void* input, int length)125 {126 unsigned char* in = (unsigned char*) input;127int i;128if(!length) // 如果是0则当做字符串处理129 {130while(*(in+length++));131in = (unsigned char*) input;132 }133for(i=0; i<length; i+=16)134 {135 Cipher(in+i);136 }137return input;139140void* AES::InvCipher(void* input, int length)141 {142 unsigned char* in = (unsigned char*) input;143int i;144for(i=0; i<length; i+=16)145 {146 InvCipher(in+i);147 }148return input;149 }150151void AES::KeyExpansion(unsigned char* key, unsigned char w[][4][4])152 {153int i,j,r,c;154 unsigned char rc[] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36}; 155for(r=0; r<4; r++)156 {157for(c=0; c<4; c++)158 {159 w[0][r][c] = key[r+c*4];160 }161 }162for(i=1; i<=10; i++)163 {164for(j=0; j<4; j++)165 {166 unsigned char t[4];167for(r=0; r<4; r++)168 {169 t[r] = j ? w[i][r][j-1] : w[i-1][r][3];170 }171if(j == 0)172 {173 unsigned char temp = t[0];174for(r=0; r<3; r++)175 {176 t[r] = Sbox[t[(r+1)%4]];177 }178 t[3] = Sbox[temp];179 t[0] ^= rc[i-1];180 }181for(r=0; r<4; r++)182 {183 w[i][r][j] = w[i-1][r][j] ^ t[r];184 }185 }186 }187 }188189 unsigned char AES::FFmul(unsigned char a, unsigned char b)190 {191 unsigned char bw[4];192 unsigned char res=0;193int i;194 bw[0] = b;195for(i=1; i<4; i++)196 {197 bw[i] = bw[i-1]<<1;198if(bw[i-1]&0x80)199 {200 bw[i]^=0x1b;201 }202 }203for(i=0; i<4; i++)204 {205if((a>>i)&0x01)206 {207 res ^= bw[i];208 }209 }210return res;211 }212213void AES::SubBytes(unsigned char state[][4])214 {215int r,c;216for(r=0; r<4; r++)217 {218for(c=0; c<4; c++)219 {220 state[r][c] = Sbox[state[r][c]];221 }222 }223 }224225void AES::ShiftRows(unsigned char state[][4])226 {227 unsigned char t[4];228int r,c;229for(r=1; r<4; r++)230 {231for(c=0; c<4; c++)232 {233 t[c] = state[r][(c+r)%4];234 }235for(c=0; c<4; c++)236 {237 state[r][c] = t[c];238 }239 }240 }241242void AES::MixColumns(unsigned char state[][4])243 {244 unsigned char t[4];245int r,c;246for(c=0; c< 4; c++)247 {248for(r=0; r<4; r++)249 {250 t[r] = state[r][c];251 }252for(r=0; r<4; r++)253 {254 state[r][c] = FFmul(0x02, t[r])255 ^ FFmul(0x03, t[(r+1)%4])256 ^ FFmul(0x01, t[(r+2)%4])257 ^ FFmul(0x01, t[(r+3)%4]);258 }259 }260 }261262void AES::AddRoundKey(unsigned char state[][4], unsigned char k[][4]) 263 {264int r,c;265for(c=0; c<4; c++)266 {267for(r=0; r<4; r++)268 {269 state[r][c] ^= k[r][c];270 }271 }272 }273274void AES::InvSubBytes(unsigned char state[][4])275 {276int r,c;277for(r=0; r<4; r++)278 {279for(c=0; c<4; c++)280 {281 state[r][c] = InvSbox[state[r][c]];282 }283 }284 }285286void AES::InvShiftRows(unsigned char state[][4])287 {288 unsigned char t[4];289int r,c;290for(r=1; r<4; r++)291 {292for(c=0; c<4; c++)293 {294 t[c] = state[r][(c-r+4)%4];295 }296for(c=0; c<4; c++)297 {298 state[r][c] = t[c];299 }300 }301 }302303void AES::InvMixColumns(unsigned char state[][4])304 {305 unsigned char t[4];306int r,c;307for(c=0; c< 4; c++)308 {309for(r=0; r<4; r++)310 {311 t[r] = state[r][c];312 }313for(r=0; r<4; r++)314 {315 state[r][c] = FFmul(0x0e, t[r])316 ^ FFmul(0x0b, t[(r+1)%4])317 ^ FFmul(0x0d, t[(r+2)%4])318 ^ FFmul(0x09, t[(r+3)%4]);319 }320 }321 }View Code 上⾯的加密算法是没问题的，但是接⼝有两个需要注意的地⽅，也就是在头⽂件中备注的地⽅：1、数组的⼤⼩必须是16字节或者16的整数倍。
C语言实现AES加密解密
C语言实现AES加密解密AES（Advanced Encryption Standard）是一种对称加密算法，它是目前广泛使用的加密标准之一、本文将介绍如何使用C语言实现AES加密和解密。
AES算法使用128位（16字节）的块进行加密和解密。
它支持128位、192位和256位长度的密钥。
在下面的示例中，我们将演示如何使用128位的密钥进行AES加密和解密。
首先，我们需要准备一个AES加密所需的密钥。
我们可以通过一个字符串来表示密钥，然后将其转换为字节数组。
在C语言中，可以使用`strncpy`函数将字符串复制到字节数组中。
```c#include <stdio.h>#include <stdlib.h>#include <string.h>#include <openssl/aes.h>#define AES_KEY_SIZE 128int mai//准备AES密钥unsigned char key[AES_KEY_SIZE/8];strncpy((char*)key, keyStr, AES_KEY_SIZE/8);//创建AES加密上下文AES_KEY aesKey;AES_set_encrypt_key(key, AES_KEY_SIZE, &aesKey); //待加密的数据unsigned char input[] = "Hello, AES!";int inputLen = sizeof(input)/sizeof(input[0]); //加密数据unsigned char encrypted[AES_BLOCK_SIZE];AES_encrypt(input, encrypted, &aesKey);//输出加密结果printf("Encrypted: ");for (int i = 0; i < AES_BLOCK_SIZE; i++)printf("%02x", encrypted[i]);}printf("\n");//创建AES解密上下文AES_set_decrypt_key(key, AES_KEY_SIZE, &aesKey); //解密数据unsigned char decrypted[AES_BLOCK_SIZE];AES_decrypt(encrypted, decrypted, &aesKey);//输出解密结果printf("Decrypted: ");for (int i = 0; i < AES_BLOCK_SIZE; i++)printf("%c", decrypted[i]);}printf("\n");return 0;```在上面的示例中，我们使用OpenSSL库提供的AES函数来执行加密和解密操作。
用C#实现AES加密和解密
⽤C#实现AES加密和解密AES 是⼀个新的可以⽤于保护电⼦数据的加密算法。
明确地说，AES 是⼀个迭代的、对称密钥分组的密码，它可以使⽤128、192 和 256位密钥，并且⽤ 128 位（16字节）分组加密和解密数据。
与公共密钥密码使⽤密钥对不同，对称密钥密码使⽤相同的密钥加密和解密数据。
通过分组密码返回的加密数据的位数与输⼊数据相同。
迭代加密使⽤⼀个循环结构，在该循环中重复置换（permutations ）和替换(substitutions）输⼊数据。
需要加⼊引⽤ using System.Security.Cryptography;///<summary>///有密码的AES加密///</summary>///<param name="text">加密字符</param>///<param name="password">加密的密码</param>///<param name="iv">密钥</param>///<returns></returns>public static string AESEncrypt(string text, string password, string iv){RijndaelManaged rijndaelCipher = new RijndaelManaged();rijndaelCipher.Mode = CipherMode.CBC;rijndaelCipher.Padding = PaddingMode.PKCS7;rijndaelCipher.KeySize = 128;rijndaelCipher.BlockSize = 128;byte[] pwdBytes = System.Text.Encoding.UTF8.GetBytes(password);byte[] keyBytes = new byte[16];int len = pwdBytes.Length;if (len > keyBytes.Length) len = keyBytes.Length;System.Array.Copy(pwdBytes, keyBytes, len);rijndaelCipher.Key = keyBytes;byte[] ivBytes = System.Text.Encoding.UTF8.GetBytes(iv);rijndaelCipher.IV = ivBytes;ICryptoTransform transform = rijndaelCipher.CreateEncryptor();byte[] plainText = Encoding.UTF8.GetBytes(text);byte[] cipherBytes = transform.TransformFinalBlock(plainText, 0, plainText.Length);return Convert.ToBase64String(cipherBytes);}///<summary>///随机⽣成密钥///</summary>///<returns></returns>public static string GetIv(int n){char[] arrChar = new char[]{'a','b','d','c','e','f','g','h','i','j','k','l','m','n','p','r','q','s','t','u','v','w','z','y','x','0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F','G','H','I','J','K','L','M','N','Q','P','R','T','S','V','U','W','X','Y','Z'};StringBuilder num = new StringBuilder();Random rnd = new Random(lisecond);for (int i = 0; i < n; i++){num.Append(arrChar[rnd.Next(0, arrChar.Length)].ToString());}return num.ToString();}///<summary>/// AES解密///</summary>///<param name="text"></param>///<param name="password"></param>///<param name="iv"></param>///<returns></returns>public static string AESDecrypt(string text, string password, string iv){RijndaelManaged rijndaelCipher = new RijndaelManaged();rijndaelCipher.Mode = CipherMode.CBC;rijndaelCipher.Padding = PaddingMode.PKCS7;rijndaelCipher.KeySize = 128;rijndaelCipher.BlockSize = 128;byte[] encryptedData = Convert.FromBase64String(text);byte[] pwdBytes = System.Text.Encoding.UTF8.GetBytes(password);byte[] keyBytes = new byte[16];int len = pwdBytes.Length;if (len > keyBytes.Length) len = keyBytes.Length;System.Array.Copy(pwdBytes, keyBytes, len);rijndaelCipher.Key = keyBytes;byte[] ivBytes = System.Text.Encoding.UTF8.GetBytes(iv);rijndaelCipher.IV = ivBytes;ICryptoTransform transform = rijndaelCipher.CreateDecryptor();byte[] plainText = transform.TransformFinalBlock(encryptedData, 0, encryptedData.Length);return Encoding.UTF8.GetString(plainText);}。
AES原理及其在c语言上的实现
AES加密解密算法及其在c语言上的实现引言对称密码算法主要用于保证数据的机密性,通信双方在加密/ 解密过程中使用它们共享的单一密钥。
对称密码算法的使用相当广泛,密码学界已经对它们进行了深入的研究[1] 。
最常用的对称密码算法是数据加密标准(DES) 算法,它是由IBM在美国国家安全局(NSA) 授意之下研制的一种使用56 位密钥的分组密码算法。
自1977 年公布成为美国政府的商用加密标准以来已使用20 多年[2] 。
DES 的主要问题是其密钥长度较短,已不适合于当今分布式开放网络对数据加密安全性的要求。
在DES 每隔五年的评估会议中,最后一次在1998 年美国政府终于决定不再继续延用DES作为联邦加密标准,也就表明了DES 将退出加密标准的舞台,而新的标准AES(AdvancedEncryptionStandard ) 将粉墨登场[3] 。
AES是美国国家标准技术研究所NIST旨在取代DES的新一代的加密标准[3～5] 。
NIST对AES候选算法的基本要求是:对称分组密码体制;密钥长度支持128,192,256位;明文分组长度128 位;算法应易于各种硬件和软件实现。
1998年NIST开始AES第一轮征集、分析、测试,共产生了15 个候选算法。
1999 年3 月完成了第二轮AES 的分析、测试。
1999 年8 月NIST公布了五种算法(MARS,RC6,Rijndael,Serpent,Twofish) 成为候选算法。
最后,Rijn2dael[5] ,这个由比利时人设计的算法与其它候选算法在成为高级加密标准(AES) 的竞争中取得成功,于2000 年10月被NIST宣布成为取代DES的新一代的数据加密标准,即AES。
尽管人们对AES还有不同的看法[6～8] ,但总体来说,Rijndael作为新一代的数据加密标准汇聚了强安全性、高性能、高效率、易用和灵活等优点。
AES设计有三个密钥长度:128,192,256 比特, 相对而言,AES 的128 比特密钥比DES的56 比特密钥强1021倍[4] 。
C#实现AES加解密方法
C#实现AES加解密⽅法using System;using System.Collections.Generic;using System.Text;using System.Security.Cryptography;using System.IO;namespace Csharp{class AESHelper{///<summary>/// AES加密///</summary>///<param name="Data">被加密的明⽂</param>///<param name="Key">密钥</param>///<param name="Vector">向量</param>///<returns>密⽂</returns>public static String AESEncrypt(String Data, String Key, String Vector){Byte[] plainBytes = Encoding.UTF8.GetBytes(Data);Byte[] bKey = new Byte[32];Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length);Byte[] bVector = new Byte[16];Array.Copy(Encoding.UTF8.GetBytes(Vector.PadRight(bVector.Length)), bVector, bVector.Length);Byte[] Cryptograph = null; // 加密后的密⽂Rijndael Aes = Rijndael.Create();try{// 开辟⼀块内存流using (MemoryStream Memory = new MemoryStream()){// 把内存流对象包装成加密流对象using (CryptoStream Encryptor = new CryptoStream(Memory,Aes.CreateEncryptor(bKey, bVector),CryptoStreamMode.Write)){// 明⽂数据写⼊加密流Encryptor.Write(plainBytes, 0, plainBytes.Length);Encryptor.FlushFinalBlock();Cryptograph = Memory.ToArray();}}}catch{Cryptograph = null;}return Convert.ToBase64String(Cryptograph);}///<summary>/// AES解密///</summary>///<param name="Data">被解密的密⽂</param>///<param name="Key">密钥</param>///<param name="Vector">向量</param>///<returns>明⽂</returns>public static String AESDecrypt(String Data, String Key, String Vector){Byte[] encryptedBytes = Convert.FromBase64String(Data);Byte[] bKey = new Byte[32];Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length);Byte[] bVector = new Byte[16];Array.Copy(Encoding.UTF8.GetBytes(Vector.PadRight(bVector.Length)), bVector, bVector.Length);Byte[] original = null; // 解密后的明⽂Rijndael Aes = Rijndael.Create();try{// 开辟⼀块内存流，存储密⽂using (MemoryStream Memory = new MemoryStream(encryptedBytes)){// 把内存流对象包装成加密流对象using (CryptoStream Decryptor = new CryptoStream(Memory,Aes.CreateDecryptor(bKey, bVector),CryptoStreamMode.Read)){// 明⽂存储区using (MemoryStream originalMemory = new MemoryStream()){Byte[] Buffer = new Byte[1024];Int32 readBytes = 0;while ((readBytes = Decryptor.Read(Buffer, 0, Buffer.Length)) > 0){originalMemory.Write(Buffer, 0, readBytes);}original = originalMemory.ToArray();}}}}catch{original = null;}return Encoding.UTF8.GetString(original);}///<summary>/// AES加密(⽆向量)///</summary>///<param name="plainBytes">被加密的明⽂</param>///<param name="key">密钥</param>///<returns>密⽂</returns>public static string AESEncrypt(String Data, String Key){MemoryStream mStream = new MemoryStream();RijndaelManaged aes = new RijndaelManaged();byte[] plainBytes = Encoding.UTF8.GetBytes(Data);Byte[] bKey = new Byte[32];Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length);aes.Mode = CipherMode.ECB;aes.Padding = PaddingMode.PKCS7;aes.KeySize = 128;//aes.Key = _key;aes.Key = bKey;//aes.IV = _iV;CryptoStream cryptoStream = new CryptoStream(mStream, aes.CreateEncryptor(), CryptoStreamMode.Write);try{cryptoStream.Write(plainBytes, 0, plainBytes.Length);cryptoStream.FlushFinalBlock();return Convert.ToBase64String(mStream.ToArray());}finally{cryptoStream.Close();mStream.Close();aes.Clear();}}///<summary>/// AES解密(⽆向量)///</summary>///<param name="encryptedBytes">被加密的明⽂</param>///<param name="key">密钥</param>///<returns>明⽂</returns>public static string AESDecrypt(String Data, String Key){Byte[] encryptedBytes = Convert.FromBase64String(Data);Byte[] bKey = new Byte[32];Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length);MemoryStream mStream = new MemoryStream(encryptedBytes);//mStream.Write( encryptedBytes, 0, encryptedBytes.Length );//mStream.Seek( 0, SeekOrigin.Begin );RijndaelManaged aes = new RijndaelManaged();aes.Mode = CipherMode.ECB;aes.Padding = PaddingMode.PKCS7;aes.KeySize = 128;aes.Key = bKey;//aes.IV = _iV;CryptoStream cryptoStream = new CryptoStream(mStream, aes.CreateDecryptor(), CryptoStreamMode.Read);try{byte[] tmp = new byte[encryptedBytes.Length + 32];int len = cryptoStream.Read(tmp, 0, encryptedBytes.Length + 32);byte[] ret = new byte[len];Array.Copy(tmp, 0, ret, 0, len);return Encoding.UTF8.GetString(ret);}finally{cryptoStream.Close();mStream.Close();aes.Clear();}}}}。
C#_-AES加密+解密
{ using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(),
CryptoStreamMode.Read)) { cs.Read(decryptBytes, 0, decryptse(); }
} }
/// <summary> /// AES 解密 /// </summary> /// <param name="inputdata">输入的数据</param> /// <param name="iv">向量 128</param> /// <param name="strKey">key</param> /// <returns></returns> public static byte[] AESDecrypt(byte[] inputdata, byte[] iv, string strKey) {
} return decryptBytes; }
SymmetricAlgorithm des = Rijndael.Create(); des.Key = Encoding.UTF8.GetBytes(strKey.Substring(0, 32)); des.IV = iv; byte[] decryptBytes = new byte[inputdata.Length]; using (MemoryStream ms = new MemoryStream(inputdata))
CryptoStreamMode.Write)) { cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); byte[] cipherBytes = ms.ToArray();//得到加密后的字节数组 cs.Close(); ms.Close(); return cipherBytes; }