配置什么模式和填充方式
java代码：
public static byte[] encrypt(byte[] datasource, byte[] password) {
try {
SecureRandom random = new SecureRandom();
DESKeySpec desKey = new DESKeySpec(password);
//创建一个密匙工厂，然后用它把DESKeySpec转换成
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(“DES”);
SecretKey securekey = keyFactory.generateSecret(desKey);
//Cipher对象实际完成加密操作
Cipher cipher = Cipher.getInstance(“DES/ECB/NoPadding”);
//用密匙初始化Cipher对象
cipher.init(Cipher.ENCRYPT_MODE, securekey);
//现在，获取数据并加密
//正式执行加密操作
return cipher.doFinal(datasource);
} catch (Throwable e) {
e.printStackTrace();
}
return null;
}
public static byte[] decrypt(byte[] src, byte[] password) throws Exception {
// DES算法要求有一个可信任的随机数源
SecureRandom random = new SecureRandom();
// 创建一个DESKeySpec对象
DESKeySpec desKey = new DESKeySpec(password);
// 创建一个密匙工厂
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(“DES”);
// 将DESKeySpec对象转换成SecretKey对象
SecretKey securekey = keyFactory.generateSecret(desKey);
// Cipher对象实际完成解密操作
Cipher cipher = Cipher.getInstance(“DES/ECB/NOPadding”);
// 用密匙初始化Cipher对象
cipher.init(Cipher.DECRYPT_MODE, securekey);
// 真正开始解密操作
return cipher.doFinal(src);
}
c的代码
///////////////////////////////////////////////
//描述：des加密运算函数，每次调用只运算8个byte
//参数source: 输入数据缓冲区
//参数dest： 目标输出缓冲区
//参数inkey： 密钥
//参数flg: 0表示加密，1表示解密
////////////////////////////////////////////
int des(unsigned char*source,unsigned char*dest,unsigned char*inkey,int flg)
{
unsigned char bufout[64],
kwork[56],worka[48],kn[48],buffer[64],key[64],
nbrofshift,temp1,temp2;
int valindex;
int i,j,k,iter;
/* INITIALIZE THE TABLES */
/* Table – s1 */
static unsigned char s1[4][16]={
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};
/* Table – s2 */
static unsigned char s2[4][16]={
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};
/* Table – s3 */
static unsigned char s3[4][16]={
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};
/* Table – s4 */
static unsigned char s4[4][16]={
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};
/* Table – s5 */
static unsigned char s5[4][16]={
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};
/* Table – s6 */
static unsigned char s6[4][16]={
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};
/* Table – s7 */
static unsigned char s7[4][16]={
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};
/* Table – s8 */
static unsigned char s8[4][16]={
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};
/* Table – Shift */
static unsigned char shift[16]={
1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};
/* Table – Binary */
static unsigned char binary[64]={
0,0,0,0,0,0,0,1,0,0,1,0,0,0,1,1,
0,1,0,0,0,1,0,1,0,1,1,0,0,1,1,1,
1,0,0,0,1,0,0,1,1,0,1,0,1,0,1,1,
1,1,0,0,1,1,0,1,1,1,1,0,1,1,1,1};
/* MAIN PROCESS */
/* Convert from 64-bit key into 64-byte key */
for(i=0;i< 8;i++){
key[8*i]=((j=*(inkey+i))/128)%2;
key[8*i+1]=(j/64)%2;
key[8*i+2]=(j/32)%2;
key[8*i+3]=(j/16)%2;
key[8*i+4]=(j/8)%2;
key[8*i+5]=(j/4)%2;
key[8*i+6]=(j/2)%2;
key[8*i+7]=j%2;
}
/* Convert from 64-bit data into 64-byte data */
for(i=0;i< 8;i++){
buffer[8*i]=((j=*(source+i))/128)%2;
buffer[8*i+1]=(j/64)%2;
buffer[8*i+2]=(j/32)%2;
buffer[8*i+3]=(j/16)%2;
buffer[8*i+4]=(j/8)%2;
buffer[8*i+5]=(j/4)%2;
buffer[8*i+6]=(j/2)%2;
buffer[8*i+7]=j%2;
}
/* Initial Permutation of Data */
bufout[0]=buffer[57];
bufout[1]=buffer[49];
bufout[2]=buffer[41];
bufout[3]=buffer[33];
bufout[4]=buffer[25];
bufout[5]=buffer[17];
bufout[6]=buffer[9];
bufout[7]=buffer[1];
bufout[8]=buffer[59];
bufout[9]=buffer[51];
bufout[10]=buffer[43];
bufout[11]=buffer[35];
bufout[12]=buffer[27];
bufout[13]=buffer[19];
bufout[14]=buffer[11];
bufout[15]=buffer[3];
bufout[16]=buffer[61];
bufout[17]=buffer[53];
bufout[18]=buffer[45];
bufout[19]=buffer[37];
bufout[20]=buffer[29];
bufout[21]=buffer[21];
bufout[22]=buffer[13];
bufout[23]=buffer[5];
bufout[24]=buffer[63];
bufout[25]=buffer[55];
bufout[26]=buffer[47];
bufout[27]=buffer[39];
bufout[28]=buffer[31];
bufout[29]=buffer[23];
bufout[30]=buffer[15];
bufout[31]=buffer[7];
bufout[32]=buffer[56];
bufout[33]=buffer[48];
bufout[34]=buffer[40];
bufout[35]=buffer[32];
bufout[36]=buffer[24];
bufout[37]=buffer[16];
bufout[38]=buffer[8];
bufout[39]=buffer[0];
bufout[40]=buffer[58];
bufout[41]=buffer[50];
bufout[42]=buffer[42];
bufout[43]=buffer[34];
bufout[44]=buffer[26];
bufout[45]=buffer[18];
bufout[46]=buffer[10];
bufout[47]=buffer[2];
bufout[48]=buffer[60];
bufout[49]=buffer[52];
bufout[50]=buffer[44];
bufout[51]=buffer[36];
bufout[52]=buffer[28];
bufout[53]=buffer[20];
bufout[54]=buffer[12];
bufout[55]=buffer[4];
bufout[56]=buffer[62];
bufout[57]=buffer[54];
bufout[58]=buffer[46];
bufout[59]=buffer[38];
bufout[60]=buffer[30];
bufout[61]=buffer[22];
bufout[62]=buffer[14];
bufout[63]=buffer[6];
/* Initial Permutation of Key */
kwork[0]=key[56];
kwork[1]=key[48];
kwork[2]=key[40];
kwork[3]=key[32];
kwork[4]=key[24];
kwork[5]=key[16];
kwork[6]=key[8];
kwork[7]=key[0];
kwork[8]=key[57];
kwork[9]=key[49];
kwork[10]=key[41];
kwork[11]=key[33];
kwork[12]=key[25];
kwork[13]=key[17];
kwork[14]=key[9];
kwork[15]=key[1];
kwork[16]=key[58];
kwork[17]=key[50];
kwork[18]=key[42];
kwork[19]=key[34];
kwork[20]=key[26];
kwork[21]=key[18];
kwork[22]=key[10];
kwork[23]=key[2];
kwork[24]=key[59];
kwork[25]=key[51];
kwork[26]=key[43];
kwork[27]=key[35];
kwork[28]=key[62];
kwork[29]=key[54];
kwork[30]=key[46];
kwork[31]=key[38];
kwork[32]=key[30];
kwork[33]=key[22];
kwork[34]=key[14];
kwork[35]=key[6];
kwork[36]=key[61];
kwork[37]=key[53];
kwork[38]=key[45];
kwork[39]=key[37];
kwork[40]=key[29];
kwork[41]=key[21];
kwork[42]=key[13];
kwork[43]=key[5];
kwork[44]=key[60];
kwork[45]=key[52];
kwork[46]=key[44];
kwork[47]=key[36];
kwork[48]=key[28];
kwork[49]=key[20];
kwork[50]=key[12];
kwork[51]=key[4];
kwork[52]=key[27];
kwork[53]=key[19];
kwork[54]=key[11];
kwork[55]=key[3];
50
现在还用DES怕是不太好吧。
30
20
