网络安全DES算法java实现源代码概要

public class DesUtil {
byte[] bytekey;
public DesUtil(String strKey {
this.bytekey = strKey.getBytes(;
}// 声明常量字节数组
private static final int[] IP = { 58, 50, 42, 34, 26, 18, 10, 2, 60, 52, 44, 36, 28, 20, 12, 4, 62, 54, 46, 38, 30, 22, 14, 6, 64, 56, 48,
40, 32, 24, 16, 8, 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 }; // 64
private static final int[] IP_1 = { 40, 8, 48, 16, 56, 24, 64, 32, 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 }; // 64
private static final int[] PC_1 = { 57, 49, 41, 33, 25, 17, 9, 1, 58, 50, 42, 34, 26, 18, 10, 2, 59, 51, 43, 35, 27, 19, 11, 3, 60, 52, 44,
36, 63, 55, 47, 39, 31, 23, 15, 7, 62, 54, 46, 38, 30, 22, 14, 6,
61, 53, 45, 37, 29, 21, 13, 5, 28, 20, 12, 4 }; // 56
private static final int[] PC_2 = { 14, 17, 11, 24, 1, 5, 3, 28, 15, 6, 21, 10, 23, 19, 12, 4, 26, 8, 16, 7, 27, 20, 13, 2, 41, 52, 31, 37, 47,
55, 30, 40, 51, 45, 33, 48, 44, 49, 39, 56, 34, 53, 46, 42, 50, 36, 29, 32 }; // 48
private static final int[] E = { 32, 1, 2, 3, 4, 5, 4, 5, 6, 7, 8, 9, 8, 9,
10, 11, 12, 13, 12, 13, 14, 15, 16, 17, 16, 17, 18, 19, 20, 21, 20, 21, 22, 23, 24, 25, 24, 25, 26, 27, 28, 29, 28, 29, 30, 31, 32, 1 }; // 48 private static final int[] P = { 16, 7, 20, 21, 29, 12, 28, 17, 1, 15, 23, 26, 5, 18, 31, 10, 2, 8, 24, 14, 32, 27, 3, 9, 19, 13, 30, 6, 22,
11, 4, 25 }; // 32
private static final int[][][] S_Box = {//S-盒
{// S_Box[1]
{ 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 } }, { // S_Box[2]
{ 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 } }, { // S_Box[3]
{ 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 } }, { // S_Box[4]
{ 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 } }, { // S_Box[5]
{ 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 } }, { // S_Box[6]
{ 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 } },
{ // S_Box[7]
{ 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 } },
{ // S_Box[8]
{ 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 } }
};
private static final int[] LeftMove = { 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2,2, 2, 2, 1 }; // 左移位置列表
private byte[] UnitDes(byte[] des_key, byte[] des_data, int flag {
// 检测输入参数格式是否正确,错误直接返回空值(null
if ((des_key.length != 8 || (des_data.length != 8|| ((flag != 1 && (flag != 0 { throw new RuntimeException("Data Format Error !";
}
int flags = flag;// 二进制加密密钥
int[] keydata = new int[64];// 二进制加密数据
int[] encryptdata = new int[64]; // 加密操作完成后的字节数组
byte[] EncryptCode = new byte[8];// 密钥初试化成二维数组
int[][] KeyArray = new int[16][48];// 将密钥字节数组转换成二进制字节数组keydata = ReadDataToBirnaryIntArray(des_key;// 将加密数据字节数组转换成二进制字节数组
encryptdata = ReadDataToBirnaryIntArray(des_data;// 初试化密钥为二维密钥数组
KeyInitialize(keydata, KeyArray; // 执行加密解密操作 EncryptCode =
Encrypt(encryptdata, flags, KeyArray;
return EncryptCode;
}// 初试化密钥数组
private void KeyInitialize(int[] key, int[][] keyarray {
int i;
int j;
int[] K0 = new int[56];// 特别注意:xxx[IP[i]-1]等类似变换
for (i = 0; i < 56; i++ {
K0[i] = key[PC_1[i] - 1]; // 密钥进行 PC-1变换
}
for (i = 0; i < 16; i++ {
LeftBitMove(K0, LeftMove[i]; // 特别注意:xxx[IP[i]-1]等类似变换 for (j = 0; j < 48; j++ {
keyarray[i][j] = K0[PC_2[j] - 1]; // 生成子密钥 keyarray[i][j] }
}
} // 执行加密解密操作
private byte[] Encrypt(int[] timeData, int flag, int[][] keyarray { int i;
byte[] encrypt = new byte[8];
int flags = flag;
int[] M = new int[64];
int[] MIP_1 = new int[64];
// 特别注意:xxx[IP[i]-1]等类似变换
for (i = 0; i < 64; i++ {
M[i] = timeData[IP[i] - 1]; // 明文 IP 变换
}
if (flags == 1 { // 加密
for (i = 0; i < 16; i++ {
LoopF(M, i, flags, keyarray;
}
} else if (flags == 0 { // 解密
for (i = 15; i > -1; i-- {
LoopF(M, i, flags, keyarray;
}
}
for (i = 0; i < 64; i++ {
MIP_1[i] = M[IP_1[i] - 1]; // 进行 IP-1运算
}
GetEncryptResultOfByteArray(MIP_1, encrypt;// 返回加密数据 return encrypt; }
private int[] ReadDataToBirnaryIntArray(byte[] intdata { int i;
int j;
// 将数据转换为二进制数,存储到数组
int[] IntDa = new int[8];
for (i = 0; i < 8; i++ {
IntDa[i] = intdata[i];
if (IntDa[i] < 0 {
IntDa[i] += 256;
IntDa[i] %= 256;
}
}
int[] IntVa = new int[64];
for (i = 0; i < 8; i++ {
for (j = 0; j < 8; j++ {
IntVa[((i * 8 + 7 - j] = IntDa[i] % 2; IntDa[i] = IntDa[i] / 2; }
}
return IntVa;
}
private void LeftBitMove(int[] k, int offset { int i;
// 循环移位操作函数
int[] c0 = new int[28];
int[] d0 = new int[28];
int[] c1 = new int[28];
int[] d1 = new int[28];
for (i = 0; i < 28; i++ {
c0[i] = k[i];
d0[i] = k[i + 28];
}
if (offset == 1 {
for (i = 0; i < 27; i++ { // 循环左移一位 c1[i] = c0[i + 1]; d1[i] = d0[i + 1];
}
c1[27] = c0[0];
d1[27] = d0[0];
} else if (offset == 2 {
for (i = 0; i < 26; i++ { // 循环左移两位 c1[i] = c0[i + 2]; d1[i] = d0[i + 2];
}
c1[26] = c0[0];
d1[26] = d0[0];
c1[27] = c0[1];
d1[27] = d0[1];
}
for (i = 0; i < 28; i++ {
k[i] = c1[i];
k[i + 28] = d1[i];
}
}
private void LoopF(int[] M, int times, int flag, int[][] keyarray { int i;
int j;
int[] L0 = new int[32];
int[] R0 = new int[32];
int[] L1 = new int[32];
int[] R1 = new int[32];
int[] RE = new int[48];
int[][] S = new int[8][6];
int[] sBoxData = new int[8];
int[] sValue = new int[32];
int[] RP = new int[32];
for (i = 0; i < 32; i++ {
L0[i] = M[i]; // 明文左侧的初始化
R0[i] = M[i + 32]; // 明文右侧的初始化
}
for (i = 0; i < 48; i++ {
RE[i] = R0[E[i] - 1]; // 经过 E 变换扩充,由 32位变为 48位
RE[i] = RE[i] + keyarray[times][i]; // 与 KeyArray[times][i]按位作不进位加法运算
if (RE[i] == 2 {
RE[i] = 0;
}
}
for (i = 0; i < 8; i++ { // 48位分成 8组
for (j = 0; j < 6; j++ {
S[i][j] = RE[(i * 6 + j];
}
// 下面经过 S 盒,得到 8个数
sBoxData[i] = S_Box[i][(S[i][0] << 1 + S[i][5]][(S[i][1] << 3
+ (S[i][2] << 2 + (S[i][3] << 1 + S[i][4]];
// 8个数变换输出二进制
for (j = 0; j < 4; j++ {
sValue[((i * 4 + 3 - j] = sBoxData[i] % 2;
sBoxData[i] = sBoxData[i] / 2;
}
}
for (i = 0; i < 32; i++ {
RP[i] = sValue[P[i] - 1]; // 经过 P 变换
L1[i] = R0[i]; // 右边移到左边
R1[i] = L0[i] + RP[i];
if (R1[i] == 2 {
R1[i] = 0;
}
// 重新合成 M ,返回数组 M
// 最后一次变换时,左右不进行互换。

此处采用两次变换实现不变 if (((flag == 0 && (times == 0 || ((flag == 1 && (times == 15 { M[i] = R1[i];
M[i + 32] = L1[i];
}
else {
M[i] = L1[i];
M[i + 32] = R1[i];
}
}
}
private void GetEncryptResultOfByteArray(int[] data, byte[] value { int i;
int j; // 将存储 64位二进制数据的数组中的数据转换为八个整数(byte for (i = 0;
i < 8; i++ {
for (j = 0; j < 8; j++ {
value[i] += (data[(i << 3 + j] << (7 - j;
}
}
for (i = 0; i < 8; i++ {
value[i] %= 256;
if (value[i] > 128 {
value[i] -= 255;
}
}
}
private byte[] ByteDataFormat(byte[] data, int flag { int len = data.length;
int padlen = 8 - (len % 8;
int newlen = len + padlen;
byte[] newdata = new byte[newlen];
System.arraycopy(data, 0, newdata, 0, len;
for (int i = len; i < newlen; i++
newdata[i] = (byte padlen;
return newdata;
}
public byte[] DesEncrypt(byte[] des_data, int flag { byte[] format_key = ByteDataFormat(bytekey, flag; byte[] format_data = ByteDataFormat(des_data, flag; int datalen = format_data.length;
int unitcount = datalen / 8;
byte[] result_data = new byte[datalen];
for (int i = 0; i < unitcount; i++ {
byte[] tmpkey = new byte[8];
byte[] tmpdata = new byte[8];
System.arraycopy(format_key, 0, tmpkey, 0, 8; System.arraycopy(format_data, i * 8, tmpdata, 0, 8;
byte[] tmpresult = UnitDes(tmpkey, tmpdata, flag; System.arraycopy(tmpresult, 0, result_data, i * 8, 8;
} // 当前为解密过程,去掉加密时产生的填充位
byte[] decryptbytearray = null;
if (flag == 0 {
int total_len = datalen;
int delete_len = result_data[total_len - 8 - 1];
delete_len = ((delete_len >= 1 && (delete_len <= 8 ? delete_len : 0; decryptbytearray = new byte[total_len - delete_len - 8];
boolean del_flag = true;
for (int k = 0; k < delete_len; k++ {
if (delete_len != result_data[total_len - 8 - (k + 1]
del_flag = false;
}
if (del_flag == true {
System.arraycopy(result_data, 0, decryptbytearray, 0, total_len- delete_len 8; } } return (flag == 1 ? result_data : decryptbytearray; } public static void main(String[] args { String key = "这是密钥"; String data = "这是明文"; DesUtil desUtil = new
DesUtil(key; System.err.println("加密前明文：" + data; // 加密后的 byte 型的密文
byte[] result = desUtil.DesEncrypt(data.getBytes(, 1; System.err.println("加密后密文：" + new String(result; // 下句直接把 byte 类型的密文解密 System.err.println("解密后明文："+ new String(desUtil.DesEncrypt(result, 0; } } 11。