packagecom.agiers.util;
publicclassDes {
byte[] bytekey;
publicDes(String strKey) {
intlen = strKey.length();
if(len< 8) {
for(inti = len; i< 8; i++) {
strKey += " ";
}
}
this.bytekey = strKey.getBytes();
}
// 声明常量字节数组
privatestaticfinalint[] 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
privatestaticfinalint[] 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
privatestaticfinalint[] 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
privatestaticfinalint[] 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
privatestaticfinalint[] 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
privatestaticfinalint[] 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
privatestaticfinalint[][][] S_Box = {
{ { 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[1]
{ 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[2]
{ 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[3]
{ 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[4]
{ 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[5]
{ 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[6]
{ 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[7]
{ 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} } // S_Box[8]
};
privatestaticfinalint[] LeftMove = { 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2,
2, 2, 2, 2, 1}; // 左移位置列表
privatebyte[] UnitDes(byte[] des_key, byte[] des_data, intflag) {
// 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))) {
thrownewRuntimeException("Data Format Error !");
}
intflags = flag;
// 二进制加密密钥
int[] keydata = newint[64];
// 二进制加密数据
int[] encryptdata = newint[64];
// 加密操作完成后的字节数组
byte[] EncryptCode = newbyte[8];
// 密钥初试化成二维数组
int[][] KeyArray = newint[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);
returnEncryptCode;
}
// 初试化密钥数组
privatevoidKeyInitialize(int[] key, int[][] keyarray) {
inti;
intj;
int[] K0 = newint[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
privatebyte[] Encrypt(int[] timeData, intflag, int[][] keyarray) {
inti;
byte[] encrypt = newbyte[8];
intflags = flag;
int[] M = newint[64];
int[] MIP_1 = newint[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);
}
}
elseif(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
returnencrypt;
}
privateint[] ReadDataToBirnaryIntArray(byte[] intdata) {
inti;
intj;
// 将数据转换为二进制数,存储到数组
int[] IntDa = newint[8];
for(i = 0; i< 8; i++) {
IntDa[i] = intdata[i];
if(IntDa[i]< 0) {
IntDa[i] += 256;
IntDa[i] %= 256;
}
}
int[] IntVa = newint[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;
}
}
returnIntVa;
}
privatevoidLeftBitMove(int[] k, intoffset) {
inti;
// 循环移位操作函数
int[] c0 = newint[28];
int[] d0 = newint[28];
int[] c1 = newint[28];
int[] d1 = newint[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];
}
elseif(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];
}
}
privatevoidLoopF(int[] M, inttimes, intflag, int[][] keyarray) {
inti;
intj;
int[] L0 = newint[32];
int[] R0 = newint[32];
int[] L1 = newint[32];
int[] R1 = newint[32];
int[] RE = newint[48];
int[][] S = newint[8][6];
int[] sBoxData = newint[8];
int[] sValue = newint[32];
int[] RP = newint[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];
}
}
}
privatevoidGetEncryptResultOfByteArray(int[] data, byte[] value) {
inti;
intj;
// 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;
}
}
}
privatebyte[] ByteDataFormat(byte[] data, intflag) {
intlen = data.length;
intpadlen = 8- (len % 8);
intnewlen = len + padlen;
byte[] newdata = newbyte[newlen];
System.arraycopy(data, 0, newdata, 0, len);
for(inti = len; i< newlen; i++) {
newdata[i] = (byte) padlen;
}
returnnewdata;
}
publicbyte[] DesEncrypt(byte[] des_data, intflag) {
byte[] format_key = ByteDataFormat(bytekey, flag);
byte[] format_data = ByteDataFormat(des_data, flag);
intdatalen = format_data.length;
intunitcount = datalen / 8;
byte[] result_data = newbyte[datalen];
for(inti = 0; i< unitcount; i++) {
byte[] tmpkey = newbyte[8];
byte[] tmpdata = newbyte[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) {
inttotal_len = datalen;
intdelete_len = result_data[total_len - 8- 1];
delete_len = ((delete_len >= 1)&& (delete_len< = 8)) ? delete_len : 0;
decryptbytearray = newbyte[total_len - delete_len - 8];
booleandel_flag = true;
for(intk = 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;
}
}
Des源码
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