AES算法C语言实现源码(带注释)
AES加密算法c语言实现代码
/*密钥置换1*/ int DES_PC1_Transform(ElemType key[64], ElemType tempbts[56]){ int cnt; for(cnt = 0; cnt < 56; cnt++){
AES加密算法c语言实现代码
/*将二进制位串转为长度为8的字符串*/ int Bit64ToChar8(ElemType bit[64],ElemType ch[8]){ int cnt; memset(ch,0,8); for(cnt = 0; cnt < 8; cnt++){
BitToByte(bit+(cnt<<3),ch+cnt); } return 0; }
/*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};
/*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};
int ByteToBit(ElemType ch,ElemType bit[8]); int BitToByte(ElemType bit[8],ElemType *ch); int Char8ToBit64(ElemType ch[8],ElemType bit[64]); int Bit64ToChar8(ElemType bit[64],ElemType ch[8]); int DES_MakeSubKeys(ElemType key[64],ElemType subKeys[16][48]); int DES_PC1_Transform(ElemType key[64], ElemType tempbts[56]); int DES_PC2_Transform(ElemType key[56], ElemType tempbts[48]); int DES_ROL(ElemType data[56], int time); int DES_IP_Transform(ElemType data[64]); int DES_IP_1_Transform(ElemType data[64]); int DES_E_Transform(ElemType data[48]); int DES_P_Transform(ElemType data[32]); int DES_SBOX(ElemType data[48]); int DES_XOR(ElemType R[48], ElemType L[48],int count); int DES_Swap(ElemType left[32],ElemType right[32]); int DES_EncryptBlock(ElemType plainBlock[8], ElemType subKeys[16][48], ElemType cipherBlock[8]); int DES_DecryptBlock(ElemType cipherBlock[8], ElemType subKeys[16][48], ElemType plainBlock[8]); int DES_Encrypt(char *plainFile, char *keyStr,char *cipherFile); int DES_Decrypt(char *cipherFile, char *keyStr,char *plainFile);
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加密算法源代码
AES加密算法源代码AES加密算法源代码//AES.h#define decrypt TRUE#define encrypt FALSE#define TYPE BOOLtypedef struct _AES{int Nb;int Nr;int Nk;unsigned long *Word;unsigned long *State;}AES;/*加密数据byte *input 明文byte *inSize 明文长byte *out 密文存放的地方byte *key 密钥keybyte *keySize 密钥长*/void Cipher(unsigned char* input,int inSize,unsigned char* out,unsigned char* key,int keySize);/*解密数据byte *input 密文int *inSize 密文长byte *out 明文存放的地方byte *key 密钥keyint *keySize 密钥长*/void InvCipher(unsigned char* input,int inSize,unsigned char* out, unsigned char* key,int keySize);/*生成加密用的参数AES结构int inSize 块大小byte* 密钥int 密钥长unsigned long 属性(标实类型) 返回AES结构指针*/AES *InitAES(AES *aes,int inSize,unsigned char* key,int keySize, TYPE type);生成加密用的参数AES结构int inSize 块大小byte* 密钥int 密钥长返回AES结构指针*/AES *InitAES(int inSize,unsigned char* key,int keySize, BOOL );/*加密时进行Nr轮运算AES * aes 运行时参数*/void CipherLoop(AES *aes);/*解密时进行Nr轮逆运算AES * aes 运行时参数*/void InvCipherLoop(AES *aes);/*释放AES结构和State和密钥库word */void freeAES(AES *aes);//AES.cpp#include "stdafx.h"#include#include#include "AES.h"unsigned char* SubWord(unsigned char* word);unsigned long* keyExpansion(unsigned char* key, int Nk, int Nr,int);/*加密数据byte *input 明文byte *inSize 明文长byte *out 密文存放的地方byte *key 密钥keybyte *keySize 密钥长*/void Cipher(unsigned char* input, int inSize, unsigned char* out, unsigned char* key, int keySize){AES aes ;InitAES(&aes,inSize,key,keySize,encrypt);memcpy(aes.State,input,inSize);CipherLoop(&aes);memcpy(out,aes.State,inSize);}解密数据byte *input 密文int *inSize 密文长byte *out 明文存放的地方byte *key 密钥keyint *keySize 密钥长*/void InvCipher(unsigned char* input, int inSize, unsigned char* out, unsigned char* key, int keySize){AES aes;InitAES(&aes,inSize,key,keySize,decrypt);memcpy(aes.State,input,inSize);InvCipherLoop(&aes);memcpy(aes.State,out,inSize);}/*生成加密用的参数AES结构int inSize 块大小byte* 密钥int 密钥长返回AES结构指针*/AES *InitAES(AES *aes,int inSize, unsigned char *key, int keySize, TYPE type){int Nb = inSize >>2,Nk = keySize >>2,Nr = Nb < Nk ? Nk:Nb+6;aes->Nb = Nb;aes->Nk = Nk;aes->Nr = Nr;aes->Word = keyExpansion(key,Nb,Nr,Nk);aes->State = new unsigned long[Nb+3];if(type)aes->State += 3;return aes;}/*生成加密用的参数AES结构int inSize 块大小byte* 密钥int 密钥长返回AES结构指针*/AES *InitAES(int inSize, unsigned char*key, int keySize,unsigned long type){return InitAES(new AES(),inSize,key,keySize,type); }/**/void CipherLoop(AES *aes){unsigned char temp[4];unsigned long *word8 = aes->Word,*State = aes->State;int Nb = aes->Nb,Nr = aes->Nr;int r;for (r = 0; r < Nb; ++r) {State[r] ^= word8[r];}for (int round =1; round { word8 += Nb;/*假设Nb=4;---------------------| s0 | s1 | s2 | s3 |---------------------| s4 | s5 | s6 | s7 |---------------------| s8 | s9 | sa | sb |---------------------| sc | sd | se | sf |---------------------| | | | |---------------------| | | | |---------------------| | | | |---------------------*/memcpy(State+Nb,State,12);/*Nb=4;---------------------| s0 | | | |---------------------| s4 | s5 | | |---------------------| s8 | s9 | sa | |---------------------| sc | sd | se | sf |---------------------| | s1 | s2 | s3 |---------------------| | | s6 | s7 |---------------------| | | | sb |---------------------*/for(r =0; r {/*temp = {Sbox[s0],Sbox[s5],Sbox[sa],Sbox[sf]};*/temp[0] = Sbox[*((unsigned char*)State)];temp[1] = Sbox[*((unsigned char*)(State+1)+1)];temp[2] = Sbox[*((unsigned char*)(State+2)+2)];temp[3] = Sbox[*((unsigned char*)(State+3)+3)];*((unsigned char*)State) = Log_02[temp[0]] ^ Log_03[temp[1]] ^ temp[2] ^ temp[3];*((unsigned char*)State+1) = Log_02[temp[1]] ^ Log_03[temp[2]] ^ temp[3] ^ temp[0];*((unsigned char*)State+2) = Log_02[temp[2]] ^ Log_03[temp[3]] ^ temp[0] ^ temp[1];*((unsigned char*)State+3) = Log_02[temp[3]] ^ Log_03[temp[0]] ^ temp[1] ^ temp[2];*State ^= word8[r];State++;}State -= Nb;}memcpy(State+Nb,State,12);word8 += Nb;for(r =0; r {*((unsigned char*)State) = Sbox[*(unsigned char*)State];*((unsigned char*)State+1) = Sbox[*((unsigned char*)(State+1)+1)];*((unsigned char*)State+2) = Sbox[*((unsigned char*)(State+2)+2)];*((unsigned char*)State+3) = Sbox[*((unsigned char*)(State+3)+3)];*State ^= word8[r];State++;}}/*解密时进行Nr轮逆运算AES * aes 运行时参数*/void InvCipherLoop(AES *aes){unsigned long *Word = aes->Word,*State = aes->State;int Nb = aes->Nb,Nr = aes->Nr;unsigned char temp[4];int r =0;Word += Nb*Nr;for (r = 0; r < Nb; ++r){State[r] ^= Word[r];}State -= 3;for (int round = Nr-1; round > 0; --round) {/*假设Nb=4;---------------------| | | | |---------------------| | | | || | | | |---------------------| s0 | s1 | s2 | s3 |---------------------| s4 | s5 | s6 | s7 |---------------------| s8 | s9 | sa | sb |---------------------| sc | sd | se | sf |---------------------*/memcpy(State,State+Nb,12); /*Nb=4;---------------------| | | | s7 |---------------------| | | sa | sb |---------------------| | sd | se | sf |---------------------| s0 | s1 | s2 | s3 |---------------------| s4 | s5 | s6 | |---------------------| s8 | s9 | | |---------------------| sc | | | |*/Word -= Nb;State += Nb+2;for(r = Nb-1; r >= 0; r--){/*temp = {iSbox[s0],iSbox[sd],iSbox[sa],iSbox[s7]};*/temp[0] = iSbox[*(byte*)State];temp[1] = iSbox[*((byte*)(State-1)+1)];temp[2] = iSbox[*((byte*)(State-2)+2)];temp[3] = iSbox[*((byte*)(State-3)+3)];*(unsigned long*)temp ^= Word[r];*(unsigned char*)State = Log_0e[temp[0]] ^ Log_0b[temp[1]] ^ Log_0d[temp[2]] ^ Log_09[temp[3]];*((unsigned char*)State+1) = Log_0e[temp[1]] ^ Log_0b[temp[2]] ^ Log_0d[temp[3]] ^ Log_09[temp[0]];*((unsigned char*)State+2) = Log_0e[temp[2]] ^ Log_0b[temp[3]] ^ Log_0d[temp[0]] ^ Log_09[temp[1]];*((unsigned char*)State+3) = Log_0e[temp[3]] ^ Log_0b[temp[0]] ^ Log_0d[temp[1]] ^ Log_09[temp[2]];State --;}State -= 2;}Word -= Nb;memcpy(State,State+Nb,12);State += Nb+2;for(r = Nb-1; r >= 0; r--){*(unsigned char*)State = iSbox[*(unsigned char*)State];*((unsigned char*)State+1) = iSbox[*((unsigned char*)(State-1)+1)];*((unsigned char*)State+2) = iSbox[*((unsigned char*)(State-2)+2)];*((unsigned char*)State+3) = iSbox[*((unsigned char*)(State-3)+3)];*State ^= Word[r];State --;}}/**--------------------------------------------*|k0|k1|k2|k3|k4|k5|k6|k7|k8|k9|.......|Nk*4|*--------------------------------------------*Nr轮密钥库*每个密钥列长度为Nb*---------------------*| k0 | k1 | k2 | k3 |*---------------------*| k4 | k5 | k6 | k7 |*---------------------*| k8 | k9 | ka | kb |*---------------------*| kc | kd | ke | kf |*---------------------*/unsigned long* keyExpansion(byte* key, int Nb, int Nr, int Nk) {unsigned long *w =new unsigned long[Nb * (Nr+1)]; // 4 columns of bytes corresponds to a wordmemcpy(w,key,Nk<<2);unsigned long temp;for (int c = Nk; c < Nb * (Nr+1); ++c){//把上一轮的最后一行放入temptemp = w[c-1];//判断是不是每一轮密钥的第一行if (c % Nk == 0){//左旋8位temp = (temp<<8)|(temp>>24);//查Sbox表SubWord((byte*)&temp);temp ^= Rcon[c/Nk];}else if ( Nk > 6 && (c % Nk == 4) ){SubWord((byte*)&temp);}//w[c-Nk] 为上一轮密钥的第一行w[c] = w[c-Nk] ^ temp;}return w;}unsigned char* SubWord(unsigned char* word) {word[0] = Sbox[ word[0] ];word[1] = Sbox[ word[1] ];word[2] = Sbox[ word[2] ];word[3] = Sbox[ word[3] ];return word;}/*释放AES结构和State和密钥库word*/void freeAES(AES *aes){// for(int i=0;iNb;i++)// {// printf("%d\n",i);// free(aes->State[i]);// free(aes->Word[i]);// }// printf("sdffd");}。
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};
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）是一种对称加密算法，被广泛应用于各种应用中，如保护通信、数据安全等。
AES算法采用分组密码的方式，将明文数据分成若干个大小相等的分组，然后对每个分组进行加密操作。
1. 密钥扩展（Key Expansion）：AES算法中使用的密钥长度分为128位、192位和256位三种，密钥长度不同，密钥扩展的轮数也不同。
根据密钥长度，需要扩展成多少个轮密钥。
扩展过程中需要进行字节代换、循环左移、模2乘法等操作。
2. 子密钥生成（Subkey Generation）：根据密钥扩展的结果，生成每一轮需要使用的子密钥。
3. 字节替换（SubBytes）：将每个字节替换为S盒中对应的值。
S盒是一个固定的预先计算好的查找表。
4. 行移位（ShiftRows）：对矩阵的行进行循环左移，左移的位数根据行数而定。
5. 列混合（MixColumns）：将每列的四个字节进行混合。
混合操作包括乘法和异或运算。
6. 轮密钥加（AddRoundKey）：将每一轮得到的结果与轮密钥进行异或运算。
以上就是AES算法的六个步骤的实现过程，下面我们来具体讲解一下。
首先，我们需要定义一些辅助函数，如字节代换函数、循环左移函数等。
```cuint8_t substitution(uint8_t byte) return sBox[byte];void shiftRows(uint8_t *state)uint8_t temp;//第二行循环左移1位temp = state[1];state[1] = state[5];state[5] = state[9];state[9] = state[13];state[13] = temp;//第三行循环左移2位temp = state[2];state[2] = state[10];state[10] = temp;temp = state[6];state[6] = state[14];state[14] = temp;//第四行循环左移3位temp = state[15];state[15] = state[11];state[11] = state[7];state[7] = state[3];state[3] = temp;void mixColumns(uint8_t *state)int i;uint8_t temp[4];for(i = 0; i < 4; i++)temp[0] = xTime(state[i * 4]) ^ xTime(state[i * 4 + 1]) ^ state[i * 4 + 1] ^state[i * 4 + 2] ^ state[i * 4 + 3];temp[1] = state[i * 4] ^ xTime(state[i * 4 + 1]) ^xTime(state[i * 4 + 2]) ^state[i * 4 + 2] ^ state[i * 4 + 3];temp[2] = state[i * 4] ^ state[i * 4 + 1] ^ xTime(state[i * 4 + 2]) ^xTime(state[i * 4 + 3]) ^ state[i * 4 + 3];temp[3] = xTime(state[i * 4]) ^ state[i * 4] ^ state[i * 4 + 1] ^state[i * 4 + 2] ^ xTime(state[i * 4 + 3]);state[i * 4] = temp[0];state[i * 4 + 1] = temp[1];state[i * 4 + 2] = temp[2];state[i * 4 + 3] = temp[3];}```接下来，我们实现密钥扩展和子密钥生成的过程。
AES加密算法（C++实现,附源码）
AES加密算法（C++实现,附源码）原创作品，转载请注明出⾃博客地址：本⽂地址：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ByteSubstitution（字节替代）⾮线性的字节替代，单独处理每个字节：求该字节在有限域GF(28)上的乘法逆，"0"被映射为⾃⾝，即对于α∈GF(28)，求β∈GF(28)，使得α·β=β·α=1mod(x 8+x 4+x 2+x+1)。
对上⼀步求得的乘法逆作仿射变换y i =x i + x (i+4)mod8 + x (i+6)mod8 + x (i+7)mod8 + c i(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12345678910111213141516171819unsigned char sBox[] ={ /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */0x63,0x7c,0x77,0x7b,0xf2,0x6b,0x6f,0xc5,0x30,0x01,0x67,0x2b,0xfe,0xd7,0xab,0x76, /*0*/0xca,0x82,0xc9,0x7d,0xfa,0x59,0x47,0xf0,0xad,0xd4,0xa2,0xaf,0x9c,0xa4,0x72,0xc0, /*1*/0xb7,0xfd,0x93,0x26,0x36,0x3f,0xf7,0xcc,0x34,0xa5,0xe5,0xf1,0x71,0xd8,0x31,0x15, /*2*/ 0x04,0xc7,0x23,0xc3,0x18,0x96,0x05,0x9a,0x07,0x12,0x80,0xe2,0xeb,0x27,0xb2,0x75, /*3*/ 0x09,0x83,0x2c,0x1a,0x1b,0x6e,0x5a,0xa0,0x52,0x3b,0xd6,0xb3,0x29,0xe3,0x2f,0x84, /*4*/0x53,0xd1,0x00,0xed,0x20,0xfc,0xb1,0x5b,0x6a,0xcb,0xbe,0x39,0x4a,0x4c,0x58,0xcf, /*5*/0xd0,0xef,0xaa,0xfb,0x43,0x4d,0x33,0x85,0x45,0xf9,0x02,0x7f,0x50,0x3c,0x9f,0xa8, /*6*/0x51,0xa3,0x40,0x8f,0x92,0x9d,0x38,0xf5,0xbc,0xb6,0xda,0x21,0x10,0xff,0xf3,0xd2, /*7*/0xcd,0x0c,0x13,0xec,0x5f,0x97,0x44,0x17,0xc4,0xa7,0x7e,0x3d,0x64,0x5d,0x19,0x73, /*8*/ 0x60,0x81,0x4f,0xdc,0x22,0x2a,0x90,0x88,0x46,0xee,0xb8,0x14,0xde,0x5e,0x0b,0xdb, /*9*/ 0xe0,0x32,0x3a,0x0a,0x49,0x06,0x24,0x5c,0xc2,0xd3,0xac,0x62,0x91,0x95,0xe4,0x79, /*a*/0xe7,0xc8,0x37,0x6d,0x8d,0xd5,0x4e,0xa9,0x6c,0x56,0xf4,0xea,0x65,0x7a,0xae,0x08, /*b*/0xba,0x78,0x25,0x2e,0x1c,0xa6,0xb4,0xc6,0xe8,0xdd,0x74,0x1f,0x4b,0xbd,0x8b,0x8a, /*c*/0x70,0x3e,0xb5,0x66,0x48,0x03,0xf6,0x0e,0x61,0x35,0x57,0xb9,0x86,0xc1,0x1d,0x9e, /*d*/ 0xe1,0xf8,0x98,0x11,0x69,0xd9,0x8e,0x94,0x9b,0x1e,0x87,0xe9,0xce,0x55,0x28,0xdf, /*e*/ 0x8c,0xa1,0x89,0x0d,0xbf,0xe6,0x42,0x68,0x41,0x99,0x2d,0x0f,0xb0,0x54,0xbb,0x16 /*f*/};下⾯是逆置换表，解密时使⽤12345678*********unsigned char invsBox[256] ={ /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */0x52,0x09,0x6a,0xd5,0x30,0x36,0xa5,0x38,0xbf,0x40,0xa3,0x9e,0x81,0xf3,0xd7,0xfb, /*0*/ 0x7c,0xe3,0x39,0x82,0x9b,0x2f,0xff,0x87,0x34,0x8e,0x43,0x44,0xc4,0xde,0xe9,0xcb, /*1*/ 0x54,0x7b,0x94,0x32,0xa6,0xc2,0x23,0x3d,0xee,0x4c,0x95,0x0b,0x42,0xfa,0xc3,0x4e, /*2*/0x08,0x2e,0xa1,0x66,0x28,0xd9,0x24,0xb2,0x76,0x5b,0xa2,0x49,0x6d,0x8b,0xd1,0x25, /*3*/0x72,0xf8,0xf6,0x64,0x86,0x68,0x98,0x16,0xd4,0xa4,0x5c,0xcc,0x5d,0x65,0xb6,0x92, /*4*/0x6c,0x70,0x48,0x50,0xfd,0xed,0xb9,0xda,0x5e,0x15,0x46,0x57,0xa7,0x8d,0x9d,0x84, /*5*/ 0x90,0xd8,0xab,0x00,0x8c,0xbc,0xd3,0x0a,0xf7,0xe4,0x58,0x05,0xb8,0xb3,0x45,0x06, /*6*/ 0xd0,0x2c,0x1e,0x8f,0xca,0x3f,0x0f,0x02,0xc1,0xaf,0xbd,0x03,0x01,0x13,0x8a,0x6b, /*7*/ 0x3a,0x91,0x11,0x41,0x4f,0x67,0xdc,0xea,0x97,0xf2,0xcf,0xce,0xf0,0xb4,0xe6,0x73, /*8*/0x96,0xac,0x74,0x22,0xe7,0xad,0x35,0x85,0xe2,0xf9,0x37,0xe8,0x1c,0x75,0xdf,0x6e, /*9*/0x47,0xf1,0x1a,0x71,0x1d,0x29,0xc5,0x89,0x6f,0xb7,0x62,0x0e,0xaa,0x18,0xbe,0x1b, /*a*/ 0xfc,0x56,0x3e,0x4b,0xc6,0xd2,0x79,0x20,0x9a,0xdb,0xc0,0xfe,0x78,0xcd,0x5a,0xf4, /*b*/14 15 16 17 18 19 0x1f,0xdd,0xa8,0x33,0x88,0x07,0xc7,0x31,0xb1,0x12,0x10,0x59,0x27,0x80,0xec,0x5f, /*c*/ 0x60,0x51,0x7f,0xa9,0x19,0xb5,0x4a,0x0d,0x2d,0xe5,0x7a,0x9f,0x93,0xc9,0x9c,0xef, /*d*/ 0xa0,0xe0,0x3b,0x4d,0xae,0x2a,0xf5,0xb0,0xc8,0xeb,0xbb,0x3c,0x83,0x53,0x99,0x61, /*e*/ 0x17,0x2b,0x04,0x7e,0xba,0x77,0xd6,0x26,0xe1,0x69,0x14,0x63,0x55,0x21,0x0c,0x7d /*f*/ };这⾥遇到问题了，本来⽤纯c初始化数组很正常，封装成类以后发现不能初始化，不管是声明、构造函数都⽆法初始化，百歌⾕度了⼀通后没有任何答案，⽆奈只能在构造函数中声明⼀个局部变量数组并初始化，然后⽤memcpy，（成员变量名为Sbox/InvSbox，局部变量名sBox/invsBox）12 3 4 5 6 7 8 9 10 11void AES::SubBytes(unsigned char state[][4]) {int r,c;for(r=0; r<4; r++){for(c=0; c<4; c++){state[r][c] = Sbox[state[r][c]];}}}ShiftRows（⾏移位变换）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⾏循环左移2个字节，第3⾏循环左移3个字节。
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算法加密C语言完整程序
AES算法加密C语言完整程序#包括〈字符串。
"#包括AES。
"#包括“大众。
”#定义字节无符号字符#定义 bpoly OxlB / /!〈下 8 位(x 8X 1 X4+3+1),艮［I (x+4+x + 3 + x+x)。
#定义块16 / /!〈字节大小的块大小。
#定义 keybits 128 / /!〈使用 AES128。
#定义轮10 / /!轮数。
#定义keylength 16 / /!字节长度的键长度。
字节XDATA酒店［256 ］； //!〈工作区1。
字节数据块 2 ［ 256 ］； //! < worksapce 2。
字节数据* powtbl； / /!〈最后位置指数表。
字节数据* logtbl； / /!对数查找表的最后位置。
字节数据* S盒；/ /! < S盒的最终位置。
字节数据* sboxinv； / / !〈逆S盒的最终位置。
字节数据* Expandedkey； / /!〈扩展键的最后位置。
CalcPowLog (* powtbl 无效字节，字节* logtbl){我二0字节数据；T = 1字节数据；做{/ /使用0x03作为幕和对数根。
powtbl ［我］=T；logtbl ［T］二我；++;/ / muliply T 3在 GF (2 " 8)。
T " = (t<<l) " (T & 0x80? bpoly： 0)；} (t! = 1)；循环属性确保i〈 255o powtbl [ 255 ] = powtbl [ 0 ]； / / 255 = - 0, 254 - 1, 虚空CalcSBox （字节* S盒）字节数据我，腐；字节数据的温度；字节的数据结果；/ /填写参赛方法[]o我=0；做{/反转 GF (2X8)。
如果(i = 0) {温度=powtbl [ 255 ] logtbl [我]；其他{ }温度=0;}/GF (2)的仿射变换。
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);。
AES算法C语言实现源码
AES算法C语言实现源码/*AES-128 bit CBC Encryptionby Jacob Lister - Mar. 2024AES128-CBC Encryption for CNOTE: This is a C implementation with minimal cost checking, designed for embedded systems with tight code space constraintsgcc -Wall -c aes.cDescription:This code is the implementation of the AES128 algorithm,specifically ECB and CBC mode. ECB stands for ElectronicCode Book mode, which is essentially plain AES encryption.CBC (Cipher Block Chaining) is a mode that allows forenhanced security.*/#include <stdio.h>#include <stdlib.h>#include <string.h>typedef unsigned char AES_BYTE;/*constant in AES. Value=4*/#define Nb 4/* The number of 32 bit words in a key. */#define Nk 4/*Key length in bytes [128 bit](Nk * 4), or 16 bytes.*/#define KEYLEN 16/*The number of rounds in AES Cipher.Number of rounds=10, 12, 14.*/#define Nr 14AES_BYTE * AES_Encrypt(AES_BYTE *plainText, AES_BYTE *key); AES_BYTE * AES_Decrypt(AES_BYTE *cipherText, AES_BYTE *key);Function to store the round keysgenerated from the cipher key.*/void AES_KeyExpansion(AES_BYTE key[4*Nk], AES_BYTE roundKey[4*Nb*(Nr+1)]);/*Cipher is the main function that encryptsthe plaintext given the key [128 bit].*/void AES_Cipher(AES_BYTE *in, AES_BYTE *out, AES_BYTE *roundKey);/*The SubBytes Function is usedto substitute each byte of the statewith its corresponding byte in theRijndael S-box.*/void SubBytes(AES_BYTE *state);The ShiftRows function is usedto shift the rows cyclically aroundthe state.*/void ShiftRows(AES_BYTE *state);/*The MixColumns function is usedto mix the columns of the statematrix.*/void MixColumns(AES_BYTE *state);/*The AddRoundKey function is usedto add round key word to thestate matrix to produce the output.*/void AddRoundKey(AES_BYTE *state, AES_BYTE* roundKey); /*The SubBytes Function is usedto substitute each byte of the state with its inverse in the Rijndael S-box. */void InvSubBytes(AES_BYTE *state);/*The InvShiftRows function is usedto shift the rows cyclically aroundthe state in the opposite direction.*/void InvShiftRows(AES_BYTE *state);/*The InvMixColumns function is usedto mix the columns of the statematrix in the opposite direction.*/void InvMixColumns(AES_BYTE *state);/*The AES_Encrypt functionencrypts the plaintext usingthe provided AES_128 encryptionkey.*/AES_BYTE* AES_Encrypt(AES_BYTE *plainText, AES_BYTE *key) //struct to store ciphertextAES_BYTE *cipherText;int stat_len = 4 * Nb;// The KeyExpansion routine must be called// before encryption.AES_BYTE roundKey[4 * Nb * (Nr + 1)];。
AES C-代码
/* This is an implementation of the RIJNDAEL cryptosystemfor 128 bit plaintext block.This programme only gives the instance of 128 bit key.You can modify a little details to meet your need for 192or 256 bit key input */#include "stdio.h"typedef unsigned char u1byte; /* an 8 bit unsigned character type */typedef unsigned long u4byte; /* a 32 bit unsigned integer type */#define LARGE_TABLESu1byte pow_tab[256];u1byte log_tab[256];u1byte sbx_tab[256];u1byte isb_tab[256];u4byte rco_tab[ 10];u4byte ft_tab[4][256];u4byte it_tab[4][256];#ifdef LARGE_TABLESu4byte fl_tab[4][256];u4byte il_tab[4][256];#endifu4byte tab_gen = 0;u4byte k_len;u4byte e_key[60];u4byte d_key[60];#define ff_mult(a,b) (a && b ? pow_tab[(log_tab[a] + log_tab[b]) % 255] : 0) #define byte(x,n) ((u1byte)((x) >> (8 * n)))#define f_rn(bo, bi, n, k) \bo[n] = ft_tab[0][byte(bi[n],0)] ^ \ft_tab[1][byte(bi[(n + 1) & 3],1)] ^ \ft_tab[2][byte(bi[(n + 2) & 3],2)] ^ \ft_tab[3][byte(bi[(n + 3) & 3],3)] ^ *(k + n)#define i_rn(bo, bi, n, k) \bo[n] = it_tab[0][byte(bi[n],0)] ^ \it_tab[1][byte(bi[(n + 3) & 3],1)] ^ \it_tab[2][byte(bi[(n + 2) & 3],2)] ^ \it_tab[3][byte(bi[(n + 1) & 3],3)] ^ *(k + n)#define rotr(x,n) (((x) >> ((int)(n))) | ((x) << (32 - (int)(n))))#define rotl(x,n) (((x) << ((int)(n))) | ((x) >> (32 - (int)(n))))#ifdef LARGE_TABLES#define ls_box(x) \( fl_tab[0][byte(x, 0)] ^ \fl_tab[1][byte(x, 1)] ^ \fl_tab[2][byte(x, 2)] ^ \fl_tab[3][byte(x, 3)] )#define f_rl(bo, bi, n, k) \bo[n] = fl_tab[0][byte(bi[n],0)] ^ \fl_tab[1][byte(bi[(n + 1) & 3],1)] ^ \fl_tab[2][byte(bi[(n + 2) & 3],2)] ^ \fl_tab[3][byte(bi[(n + 3) & 3],3)] ^ *(k + n)#define i_rl(bo, bi, n, k) \bo[n] = il_tab[0][byte(bi[n],0)] ^ \il_tab[1][byte(bi[(n + 3) & 3],1)] ^ \il_tab[2][byte(bi[(n + 2) & 3],2)] ^ \il_tab[3][byte(bi[(n + 1) & 3],3)] ^ *(k + n)#else#define ls_box(x) \((u4byte)sbx_tab[byte(x, 0)] << 0) ^ \((u4byte)sbx_tab[byte(x, 1)] << 8) ^ \((u4byte)sbx_tab[byte(x, 2)] << 16) ^ \((u4byte)sbx_tab[byte(x, 3)] << 24)#define f_rl(bo, bi, n, k) \bo[n] = (u4byte)sbx_tab[byte(bi[n],0)] ^ \rotl(((u4byte)sbx_tab[byte(bi[(n + 1) & 3],1)]), 8) ^ \rotl(((u4byte)sbx_tab[byte(bi[(n + 2) & 3],2)]), 16) ^ \rotl(((u4byte)sbx_tab[byte(bi[(n + 3) & 3],3)]), 24) ^ *(k + n)#define i_rl(bo, bi, n, k) \bo[n] = (u4byte)isb_tab[byte(bi[n],0)] ^ \rotl(((u4byte)isb_tab[byte(bi[(n + 3) & 3],1)]), 8) ^ \rotl(((u4byte)isb_tab[byte(bi[(n + 2) & 3],2)]), 16) ^ \rotl(((u4byte)isb_tab[byte(bi[(n + 1) & 3],3)]), 24) ^ *(k + n) #endifvoid gen_tabs(void){ u4byte i, t;u1byte p, q;/* log and power tables for GF(2**8) finite field with *//* 0x11b as modular polynomial - the simplest prmitive *//* root is 0x11, used here to generate the tables */for(i = 0,p = 1; i < 256; ++i){pow_tab[i] = (u1byte)p; log_tab[p] = (u1byte)i;p = p ^ (p << 1) ^ (p & 0x80 ? 0x01b : 0);}log_tab[1] = 0; p = 1;for(i = 0; i < 10; ++i){rco_tab[i] = p;p = (p << 1) ^ (p & 0x80 ? 0x1b : 0);}/* note that the affine byte transformation matrix in *//* rijndael specification is in big endian format with *//* bit 0 as the most significant bit. In the remainder *//* of the specification the bits are numbered from the *//* least significant end of a byte. */for(i = 0; i < 256; ++i){p = (i ? pow_tab[255 - log_tab[i]] : 0); q = p;q = (q >> 7) | (q << 1); p ^= q;q = (q >> 7) | (q << 1); p ^= q;q = (q >> 7) | (q << 1); p ^= q;q = (q >> 7) | (q << 1); p ^= q ^ 0x63;sbx_tab[i] = (u1byte)p; isb_tab[p] = (u1byte)i;}for(i = 0; i < 256; ++i){p = sbx_tab[i];#ifdef LARGE_TABLESt = p; fl_tab[0][i] = t;fl_tab[1][i] = rotl(t, 8);fl_tab[2][i] = rotl(t, 16);fl_tab[3][i] = rotl(t, 24);#endift = ((u4byte)ff_mult(2, p)) |((u4byte)p << 8) |((u4byte)p << 16) |((u4byte)ff_mult(3, p) << 24);ft_tab[0][i] = t;ft_tab[1][i] = rotl(t, 8);ft_tab[2][i] = rotl(t, 16);ft_tab[3][i] = rotl(t, 24);p = isb_tab[i];#ifdef LARGE_TABLESt = p; il_tab[0][i] = t;il_tab[1][i] = rotl(t, 8);il_tab[2][i] = rotl(t, 16);il_tab[3][i] = rotl(t, 24);#endift = ((u4byte)ff_mult(14, p)) |((u4byte)ff_mult( 9, p) << 8) | ((u4byte)ff_mult(13, p) << 16) | ((u4byte)ff_mult(11, p) << 24);it_tab[0][i] = t;it_tab[1][i] = rotl(t, 8);it_tab[2][i] = rotl(t, 16);it_tab[3][i] = rotl(t, 24);}tab_gen = 1;}#define star_x(x) (((x) & 0x7f7f7f7f) << 1) ^ ((((x) & 0x80808080) >> 7) * 0x1b)#define imix_col(y,x) \u = star_x(x); \v = star_x(u); \w = star_x(v); \t = w ^ (x); \(y) = u ^ v ^ w; \(y) ^= rotr(u ^ t, 8) ^ \rotr(v ^ t, 16) ^ \rotr(t,24)/* initialise the key schedule from the user supplied key */#define loop4(i) \{ t = ls_box(rotr(t, 8)) ^ rco_tab[i]; \t ^= e_key[4 * i]; e_key[4 * i + 4] = t; \t ^= e_key[4 * i + 1]; e_key[4 * i + 5] = t; \t ^= e_key[4 * i + 2]; e_key[4 * i + 6] = t; \t ^= e_key[4 * i + 3]; e_key[4 * i + 7] = t; \}#define loop6(i) \{ t = ls_box(rotr(t, 8)) ^ rco_tab[i]; \t ^= e_key[6 * i]; e_key[6 * i + 6] = t; \t ^= e_key[6 * i + 1]; e_key[6 * i + 7] = t; \t ^= e_key[6 * i + 2]; e_key[6 * i + 8] = t; \t ^= e_key[6 * i + 3]; e_key[6 * i + 9] = t; \t ^= e_key[6 * i + 4]; e_key[6 * i + 10] = t; \t ^= e_key[6 * i + 5]; e_key[6 * i + 11] = t; \}#define loop8(i) \{ t = ls_box(rotr(t, 8)) ^ rco_tab[i]; \t ^= e_key[8 * i]; e_key[8 * i + 8] = t; \t ^= e_key[8 * i + 1]; e_key[8 * i + 9] = t; \t ^= e_key[8 * i + 2]; e_key[8 * i + 10] = t; \t ^= e_key[8 * i + 3]; e_key[8 * i + 11] = t; \t = e_key[8 * i + 4] ^ ls_box(t); \e_key[8 * i + 12] = t; \t ^= e_key[8 * i + 5]; e_key[8 * i + 13] = t; \t ^= e_key[8 * i + 6]; e_key[8 * i + 14] = t; \t ^= e_key[8 * i + 7]; e_key[8 * i + 15] = t; \}void set_key(const u4byte in_key[], const u4byte key_len){ u4byte i, t, u, v, w;if(!tab_gen)gen_tabs();k_len = (key_len + 31) / 32;e_key[0] = in_key[0]; e_key[1] = in_key[1];e_key[2] = in_key[2]; e_key[3] = in_key[3];switch(k_len){case 4: t = e_key[3];for(i = 0; i < 10; ++i)loop4(i);break;case 6: e_key[4] = in_key[4]; t = e_key[5] = in_key[5]; for(i = 0; i < 8; ++i)loop6(i);break;case 8: e_key[4] = in_key[4]; e_key[5] = in_key[5];e_key[6] = in_key[6]; t = e_key[7] = in_key[7]; for(i = 0; i < 7; ++i)loop8(i);break;}d_key[0] = e_key[0]; d_key[1] = e_key[1];d_key[2] = e_key[2]; d_key[3] = e_key[3];for(i = 4; i < 4 * k_len + 24; ++i){imix_col(d_key[i], e_key[i]);}}/* encrypt a block of text */#define f_nround(bo, bi, k) \f_rn(bo, bi, 0, k); \f_rn(bo, bi, 1, k); \f_rn(bo, bi, 2, k); \f_rn(bo, bi, 3, k); \k += 4#define f_lround(bo, bi, k) \f_rl(bo, bi, 0, k); \f_rl(bo, bi, 1, k); \f_rl(bo, bi, 2, k); \f_rl(bo, bi, 3, k)void encrypt(const u4byte in_blk[4], u4byte out_blk[4]){ u4byte b0[4], b1[4], *kp;b0[0] = in_blk[0] ^ e_key[0]; b0[1] = in_blk[1] ^ e_key[1]; b0[2] = in_blk[2] ^ e_key[2]; b0[3] = in_blk[3] ^ e_key[3];kp = e_key + 4;if(k_len > 6){f_nround(b1, b0, kp); f_nround(b0, b1, kp);}if(k_len > 4){f_nround(b1, b0, kp); f_nround(b0, b1, kp);}f_nround(b1, b0, kp); f_nround(b0, b1, kp);f_nround(b1, b0, kp); f_nround(b0, b1, kp);f_nround(b1, b0, kp); f_nround(b0, b1, kp);f_nround(b1, b0, kp); f_nround(b0, b1, kp);f_nround(b1, b0, kp); f_lround(b0, b1, kp);out_blk[0] = b0[0]; out_blk[1] = b0[1];out_blk[2] = b0[2]; out_blk[3] = b0[3];}/* decrypt a block of text */#define i_nround(bo, bi, k) \i_rn(bo, bi, 0, k); \i_rn(bo, bi, 1, k); \i_rn(bo, bi, 2, k); \i_rn(bo, bi, 3, k); \k -= 4#define i_lround(bo, bi, k) \i_rl(bo, bi, 0, k); \i_rl(bo, bi, 1, k); \i_rl(bo, bi, 2, k); \i_rl(bo, bi, 3, k)void decrypt(const u4byte in_blk[4], u4byte out_blk[4]){ u4byte b0[4], b1[4], *kp;b0[0] = in_blk[0] ^ e_key[4 * k_len + 24]; b0[1] = in_blk[1] ^ e_key[4 * k_len + 25]; b0[2] = in_blk[2] ^ e_key[4 * k_len + 26]; b0[3] = in_blk[3] ^ e_key[4 * k_len + 27];kp = d_key + 4 * (k_len + 5);if(k_len > 6){i_nround(b1, b0, kp); i_nround(b0, b1, kp);}if(k_len > 4){i_nround(b1, b0, kp); i_nround(b0, b1, kp);}i_nround(b1, b0, kp); i_nround(b0, b1, kp);i_nround(b1, b0, kp); i_nround(b0, b1, kp);i_nround(b1, b0, kp); i_nround(b0, b1, kp);i_nround(b1, b0, kp); i_nround(b0, b1, kp);i_nround(b1, b0, kp); i_lround(b0, b1, kp);out_blk[0] = b0[0]; out_blk[1] = b0[1];out_blk[2] = b0[2]; out_blk[3] = b0[3];}/* use data to test programme */void main( ){ int i;u4byte out_block[4];c onst u4byte in_key[4]={0x11111111,0x22222222,0x33333333,0x44444444};const u4byte plain_block[4]={0x12121212,0x34343434,0x45454545,0x56565656}; const u4byte cipher_block[4]={0x844050f7,0xe346a4ff,0x375104da,0xabb97f8b};printf("--------------------------------------------\n");set_key(in_key, 128);encrypt(plain_block, out_block);printf("Encryptions:\n");for(i=0;i<4;i++)printf("%x ",out_block[i]);decrypt(cipher_block, out_block);printf("\nDecryptions:\n");for(i=0;i<4;i++)printf("%x ",out_block[i]);}。
aes算法c语言实现
aes算法c语言实现AES（Advanced Encryption Standard）是一种广泛应用于数据加密的算法。
以下是一个使用C语言实现的AES加密算法示例，用于对字符串进行加密和解密。
这个实现是基于ECB模式的，这是一种常用的加密模式，因为它简单且易于实现。
注意：这个实现是为了教学目的而提供的，可能不适合用于生产环境。
生产环境中的加密实现通常需要更复杂和安全的方法。
```c #include <stdio.h> #include <string.h> #include <stdint.h> #include <openssl/aes.h>void AES_encrypt(const uint8_t *key, const uint8_t*plaintext, uint8_t *ciphertext) { AES_KEY aesKey; AES_set_encrypt_key(key, 128, &aesKey);AES_encrypt(plaintext, ciphertext, &aesKey); }void AES_decrypt(const uint8_t *key, const uint8_t*ciphertext, uint8_t *plaintext) { AES_KEY aesKey; AES_set_decrypt_key(key, 128, &aesKey);AES_decrypt(ciphertext, plaintext, &aesKey); }int main() { // 定义密钥和明文/密文缓冲区uint8_t key[AES_BLOCK_SIZE]; // AES_BLOCK_SIZE是AES算法的块大小，通常是16字节（128位） uint8_tplaintext[AES_BLOCK_SIZE], ciphertext[AES_BLOCK_SIZE];// 填充密钥和明文/密文缓冲区 // 这里省略了填充代码，因为在实际应用中，你应该使用合适的填充方案来保护数据的完整性。
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算法C语言讲解与实现
字节替换Void AES::SubBytes(unsigned char state[][4]) {Int r,c;for(r=0; r<4; r++){for(c=0; c<4; c++){state[r][c] = Sbox[state[r][c]];}}}行移位Void AES::ShiftRows(unsigned char state[][4]) {unsigned char t[4];Int r,c;for(r=1; r<4; r++){for(c=0; c<4; c++){t[c] = state[r][(c+r)%4];}for(c=0; c<4; c++){state[r][c] = t[c];}}}列混淆Void AES::MixColumns(unsigned char state[][4]) {unsigned char t[4];Int r,c;for(c=0; c< 4; c++){for(r=0; r<4; r++){t[r] = state[r][c];}for(r=0; r<4; r++){state[r][c] = FFmul(0x02, t[r])^ FFmul(0x03, t[(r+1)%4])^ FFmul(0x01, t[(r+2)%4])^ FFmul(0x01, t[(r+3)%4]);}}}unsigned char AES::FFmul(unsigned char a, unsigned char b) {unsigned char bw[4];unsigned char res=0;Int i;bw[0] = b;for(i=1; i<4; i++){bw[i] = bw[i-1]<<1;if(bw[i-1]&0x80){bw[i]^=0x1b;}}for(i=0; i<4; i++){if((a>>i)&0x01){res ^= bw[i];}}Return res;}轮密钥加算法Void AES::AddRoundKey(unsigned char state[][4], unsigned char k[][4]) {Int r,c;for(c=0; c<4; c++){for(r=0; r<4; r++){state[r][c] ^= k[r][c];}}}密钥扩展算法Void AES::KeyExpansion(unsigned char* key, unsigned char w[][4][4]) {Int i,j,r,c;unsigned char rc[] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36};for(r=0; r<4; r++){for(c=0; c<4; c++){w[0][r][c] = key[r+c*4];}}for(i=1; i<=10; i++){for(j=0; j<4; j++){unsigned char t[4];for(r=0; r<4; r++){t[r] = j ? w[i][r][j-1] : w[i-1][r][3];}if(j == 0){unsigned char temp = t[0];for(r=0; r<3; r++){t[r] = Sbox[t[(r+1)%4]];}t[3] = Sbox[temp];t[0] ^= rc[i-1];}for(r=0; r<4; r++){w[i][r][j] = w[i-1][r][j] ^ t[r]; }}}}解密过程（只有逆字节替换，逆行移位，逆列混淆）Void AES::InvSubBytes(unsigned char state[][4]) {Int r,c;for(r=0; r<4; r++){for(c=0; c<4; c++){state[r][c] = InvSbox[state[r][c]];}}}Void AES::InvShiftRows(unsigned char state[][4]) {unsigned char t[4];Int r,c;for(r=1; r<4; r++){for(c=0; c<4; c++){t[c] = state[r][(c-r+4)%4];}for(c=0; c<4; c++){state[r][c] = t[c];}}}Void AES::InvMixColumns(unsigned char state[][4]) {unsigned char t[4];Int r,c;for(c=0; c< 4; c++){for(r=0; r<4; r++){t[r] = state[r][c];}for(r=0; r<4; r++){state[r][c] = FFmul(0x0e, t[r])^ FFmul(0x0b, t[(r+1)%4])^ FFmul(0x0d, t[(r+2)%4])^ FFmul(0x09, t[(r+3)%4]);}}}整体加密过程unsigned char* AES::Cipher(unsigned char* input){unsigned char state[4][4];int i,r,c;for(r=0; r<4; r++){for(c=0; c<4 ;c++){state[r][c] = input[c*4+r];}}AddRoundKey(state,w[0]);for(i=1; i<=10; i++){SubBytes(state);ShiftRows(state);if(i!=10)MixColumns(state);AddRoundKey(state,w[i]);}for(r=0; r<4; r++){for(c=0; c<4 ;c++){input[c*4+r] = state[r][c];}}return input;}整体解密过程unsigned char* AES::InvCipher(unsigned char* input) {unsigned char state[4][4];Int i,r,c;for(r=0; r<4; r++){for(c=0; c<4 ;c++){state[r][c] = input[c*4+r];}}AddRoundKey(state, w[10]);for(i=9; i>=0; i--){InvShiftRows(state);InvSubBytes(state);AddRoundKey(state, w[i]); if(i)InvMixColumns(state); }for(r=0; r<4; r++){for(c=0; c<4 ;c++){input[c*4+r] = state[r][c]; }}Return input;}。
C语言实现数据加密算法
C语言实现数据加密算法数据加密是对敏感信息进行转换的过程，以保护数据的机密性和完整性。
C语言提供了强大的工具和库来实现各种加密算法，包括对称加密和非对称加密等。
对称加密算法是一种使用相同密钥加密和解密数据的方法。
其中最常见的算法是DES(Data Encryption Standard)和AES(Advanced Encryption Standard)。
下面是一个实现AES算法的示例代码：```c#include <stdio.h>#include <stdlib.h>#include <string.h>#include <openssl/aes.h>void encrypt_data(const unsigned char *data, size_t len, const unsigned char *key, unsigned char *encrypted_data) AES_KEY aes_key;AES_set_encrypt_key(key, 128, &aes_key);AES_encrypt(data, encrypted_data, &aes_key);void decrypt_data(const unsigned char *encrypted_data,size_t len, const unsigned char *key, unsigned char *data) AES_KEY aes_key;AES_set_decrypt_key(key, 128, &aes_key);AES_decrypt(encrypted_data, data, &aes_key);int maiunsigned char data[AES_BLOCK_SIZE] = "hello world!";size_t len = sizeof(data);unsigned char encrypted_data[AES_BLOCK_SIZE];encrypt_data(data, len, key, encrypted_data);unsigned char decrypted_data[AES_BLOCK_SIZE];decrypt_data(encrypted_data, len, key, decrypted_data);printf("Original Data: %s\n", data);printf("Encrypted Data: ");for (int i = 0; i < len; i++)printf("%02x ", encrypted_data[i]);}printf("\nDecrypted Data: %s\n", decrypted_data);return 0;```以上代码使用了OpenSSL库中的AES加密算法。