📄 md5_encoding.java
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package com.mvc.login;
import java.lang.*;
import java.math.*;
public class MD5_Encoding { //实现数据加密
static final int S11 = 7,S12 = 12,S13 = 17, S14 = 22; //RFC1321中定义的标准4*4矩阵的常量定义
static final int S21 = 5,S22 = 9, S23 = 14, S24 = 20;
static final int S31 = 4,S32 = 11,S33 = 16, S34 = 23;
static final int S41 = 6,S42 = 10,S43 = 15, S44 = 21;
static final byte[] PADDING = { -128, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, //按RFC1321标准定义不可变byte型数组PADDING
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0 };
private long[] state = new long[4]; //计算状态(分别对应a b c d)
private byte[] buffer = new byte[64]; //分配64个字节私有缓冲区
private long[] count = new long[2]; //位个数
public String resultStr; //最新一次计算结果的16进制ASCII字符串表示，代表了16个字符串形式的MD5值
public byte[] digest = new byte[16]; //最新一次计算结果的2进制数组表示，一共16个字节，代表了128bit形式的MD5值
public String getMD5ofStr(String in){ //进行数据加密变换
md5Init(); // 初始化
md5Update(in.getBytes(), in.length());// 调用MD5的主计算过程
md5Final(); // 输出结果到digest数组中
for (int i = 0; i < 16; i++) {
resultStr += byteToHEX(digest[i]); // 将digest数组中的每个byte型数据转为16进制形式的字符串
}
return resultStr;
}
public MD5_Encoding() { //构造函数，调用md5Init函数进行初始化工作
md5Init();
return;
}
private void md5Init() { //初始化核心变量
state[0] = 0x67452301L; // 定义state为RFC1321中定义的标准幻数
state[1] = 0xefcdab89L; // 定义state为RFC1321中定义的标准幻数
state[2] = 0x98badcfeL; // 定义state为RFC1321中定义的标准幻数
state[3] = 0x10325476L; // 定义state为RFC1321中定义的标准幻数
count[0] = count[1] =0L; // 初始化为0
resultStr = "";// 初始化resultStr字符串为空
for(int i=0;i<16;i++) digest[i]=0;//初始化digest数组元素为0
return;
}
private long F(long x, long y, long z) { //定义F G H I 为4个基数 ，即为4个基本的MD5函数,进行简单的位运算
return (x & y) | ((~x) & z);
}
private long G(long x, long y, long z) {
return (x & z) | (y & (~z));
}
private long H(long x, long y, long z) {
return x ^ y ^ z;
}
private long I(long x, long y, long z) {
return y ^ (x | (~z));
}
private long FF(long a, long b, long c, long d, long x, long s, long ac) {
a += F(b, c, d) + x + ac;
a = ((int) a << s) | ((int) a >>> (32 - s)); //这里long型数据右移时使用无符号右移运算符>>>
a += b;
return a;
}
private long GG(long a, long b, long c, long d, long x, long s, long ac) {
a += G(b, c, d) + x + ac;
a = ((int) a << s) | ((int) a >>> (32 - s)); //这里long型数据右移时使用无符号右移运算符>>>
a += b;
return a;
}
private long HH(long a, long b, long c, long d, long x, long s, long ac) {
a += H(b, c, d) + x + ac;
a = ((int) a << s) | ((int) a >>> (32 - s));//这里long型数据右移时使用无符号右移运算符>>>
a += b;
return a;
}
private long II(long a, long b, long c, long d, long x, long s, long ac) {
a += I(b, c, d) + x + ac;
a = ((int) a << s) | ((int) a >>> (32 - s));//这里long型数据右移时使用无符号右移运算符>>>
a += b;
return a;
}
private void md5Update(byte[] input, int inputLen) { //MD5的主计算过程
int i=0, index, partLen;
byte[] block = new byte[64]; // 分配64个字节缓冲区
//根据count计算index值。这里long型数据右移时使用无符号右移运算符>>>
index = (int) (count[0] >>> 3) & 0x3F;
if ((count[0] += (inputLen << 3)) < (inputLen << 3))
count[1]++;
count[1] += (inputLen >>> 29); //这里int型数据右移时使用无符号右移运算符>>>
partLen = 64 - index; //计算partLen值
if (inputLen >= partLen) {
md5Memcpy(buffer, input, index, 0, partLen);
md5Transform(buffer);
for (i = partLen; i + 63 < inputLen; i += 64) {
md5Memcpy(block, input, 0, i, 64);
md5Transform(block);
}
index = 0;
} else
i = 0;
md5Memcpy(buffer, input, index, i, inputLen - i);
}
private void md5Final() { //整理和填写输出结果
byte[] bits = new byte[8];
int index, padLen;
Encode(bits, count, 8);
index = (int) (count[0] >>> 3) & 0x3f; //这里long型数据右移时使用无符号右移运算符>>>
padLen = (index < 56) ? (56 - index) : (120 - index);
md5Update(PADDING, padLen);
md5Update(bits, 8);
Encode(digest, state, 16);
}
private void md5Memcpy(byte[] output, byte[] input, int outpos, int inpos, int len) {//byte数组的块拷贝函数
int i;
for (i = 0; i < len; i++)
output[outpos + i] = input[inpos + i];
}
private void md5Transform(byte block[]) { // MD5核心变换计算程序
long a = state[0], b = state[1], c = state[2], d = state[3];
long[] x = new long[16];
Decode(x, block, 64);
// 进行4级级联运算
// 第1级
a = FF(a, b, c, d, x[0], S11, 0xd76aa478L); /* 1 */
d = FF(d, a, b, c, x[1], S12, 0xe8c7b756L); /* 2 */
c = FF(c, d, a, b, x[2], S13, 0x242070dbL); /* 3 */
b = FF(b, c, d, a, x[3], S14, 0xc1bdceeeL); /* 4 */
a = FF(a, b, c, d, x[4], S11, 0xf57c0fafL); /* 5 */
d = FF(d, a, b, c, x[5], S12, 0x4787c62aL); /* 6 */
c = FF(c, d, a, b, x[6], S13, 0xa8304613L); /* 7 */
b = FF(b, c, d, a, x[7], S14, 0xfd469501L); /* 8 */
a = FF(a, b, c, d, x[8], S11, 0x698098d8L); /* 9 */
d = FF(d, a, b, c, x[9], S12, 0x8b44f7afL); /* 10 */
c = FF(c, d, a, b, x[10], S13, 0xffff5bb1L); /* 11 */
b = FF(b, c, d, a, x[11], S14, 0x895cd7beL); /* 12 */
a = FF(a, b, c, d, x[12], S11, 0x6b901122L); /* 13 */
d = FF(d, a, b, c, x[13], S12, 0xfd987193L); /* 14 */
c = FF(c, d, a, b, x[14], S13, 0xa679438eL); /* 15 */
b = FF(b, c, d, a, x[15], S14, 0x49b40821L); /* 16 */
// 第2级
a = GG(a, b, c, d, x[1], S21, 0xf61e2562L); /* 17 */
d = GG(d, a, b, c, x[6], S22, 0xc040b340L); /* 18 */
c = GG(c, d, a, b, x[11], S23, 0x265e5a51L); /* 19 */
b = GG(b, c, d, a, x[0], S24, 0xe9b6c7aaL); /* 20 */
a = GG(a, b, c, d, x[5], S21, 0xd62f105dL); /* 21 */
d = GG(d, a, b, c, x[10], S22, 0x2441453L); /* 22 */
c = GG(c, d, a, b, x[15], S23, 0xd8a1e681L); /* 23 */
b = GG(b, c, d, a, x[4], S24, 0xe7d3fbc8L); /* 24 */
a = GG(a, b, c, d, x[9], S21, 0x21e1cde6L); /* 25 */
d = GG(d, a, b, c, x[14], S22, 0xc33707d6L); /* 26 */
c = GG(c, d, a, b, x[3], S23, 0xf4d50d87L); /* 27 */
b = GG(b, c, d, a, x[8], S24, 0x455a14edL); /* 28 */
a = GG(a, b, c, d, x[13], S21, 0xa9e3e905L); /* 29 */
d = GG(d, a, b, c, x[2], S22, 0xfcefa3f8L); /* 30 */
c = GG(c, d, a, b, x[7], S23, 0x676f02d9L); /* 31 */
b = GG(b, c, d, a, x[12], S24, 0x8d2a4c8aL); /* 32 */
// 第3级
a = HH(a, b, c, d, x[5], S31, 0xfffa3942L); /* 33 */
d = HH(d, a, b, c, x[8], S32, 0x8771f681L); /* 34 */
c = HH(c, d, a, b, x[11], S33, 0x6d9d6122L); /* 35 */
b = HH(b, c, d, a, x[14], S34, 0xfde5380cL); /* 36 */
a = HH(a, b, c, d, x[1], S31, 0xa4beea44L); /* 37 */
d = HH(d, a, b, c, x[4], S32, 0x4bdecfa9L); /* 38 */
c = HH(c, d, a, b, x[7], S33, 0xf6bb4b60L); /* 39 */
b = HH(b, c, d, a, x[10], S34, 0xbebfbc70L); /* 40 */
a = HH(a, b, c, d, x[13], S31, 0x289b7ec6L); /* 41 */
d = HH(d, a, b, c, x[0], S32, 0xeaa127faL); /* 42 */
c = HH(c, d, a, b, x[3], S33, 0xd4ef3085L); /* 43 */
b = HH(b, c, d, a, x[6], S34, 0x4881d05L); /* 44 */
a = HH(a, b, c, d, x[9], S31, 0xd9d4d039L); /* 45 */
d = HH(d, a, b, c, x[12], S32, 0xe6db99e5L); /* 46 */
c = HH(c, d, a, b, x[15], S33, 0x1fa27cf8L); /* 47 */
b = HH(b, c, d, a, x[2], S34, 0xc4ac5665L); /* 48 */
// 第4级
a = II(a, b, c, d, x[0], S41, 0xf4292244L); /* 49 */
d = II(d, a, b, c, x[7], S42, 0x432aff97L); /* 50 */
c = II(c, d, a, b, x[14], S43, 0xab9423a7L); /* 51 */
b = II(b, c, d, a, x[5], S44, 0xfc93a039L); /* 52 */
a = II(a, b, c, d, x[12], S41, 0x655b59c3L); /* 53 */
d = II(d, a, b, c, x[3], S42, 0x8f0ccc92L); /* 54 */
c = II(c, d, a, b, x[10], S43, 0xffeff47dL); /* 55 */
b = II(b, c, d, a, x[1], S44, 0x85845dd1L); /* 56 */
a = II(a, b, c, d, x[8], S41, 0x6fa87e4fL); /* 57 */
d = II(d, a, b, c, x[15], S42, 0xfe2ce6e0L); /* 58 */
c = II(c, d, a, b, x[6], S43, 0xa3014314L); /* 59 */
b = II(b, c, d, a, x[13], S44, 0x4e0811a1L); /* 60 */
a = II(a, b, c, d, x[4], S41, 0xf7537e82L); /* 61 */
d = II(d, a, b, c, x[11], S42, 0xbd3af235L); /* 62 */
c = II(c, d, a, b, x[2], S43, 0x2ad7d2bbL); /* 63 */
b = II(b, c, d, a, x[9], S44, 0xeb86d391L); /* 64 */
//分别累加到state[0],state[1],state[2],state[3]
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
}
private static long byteToul(byte b) { //把byte型数据转换为无符号long型数据
return b >0 ?b : ( b & 0x7F + 128);
}
private static String byteToHEX(byte in) { //把byte类型的数据转换成十六进制ASCII字符表示
char[] DigitStr = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'A', 'B', 'C', 'D', 'E', 'F' };
char[] out = new char[2];
out[0] = DigitStr[(in >> 4) & 0x0F]; //取高4位
out[1] = DigitStr[in & 0x0F]; //取低4位
String s = new String(out);
return s;
}
private void Encode(byte[] output, long[] input, int len) { //将long型数组按顺序拆成byte型数组,长度为len
int i, j;
for (i = 0, j = 0; j < len; i++, j += 4) {
output[j] = (byte) (input[i] & 0xffL);
output[j + 1] = (byte) ((input[i] >>> 8) & 0xffL);
output[j + 2] = (byte) ((input[i] >>> 16) & 0xffL);
output[j + 3] = (byte) ((input[i] >>> 24) & 0xffL);
}
}
private void Decode(long[] output, byte[] input, int len) { //将byte型数组按顺序合成long型数组，长度为len
int i, j;
for (i = 0, j = 0; j < len; i++, j += 4)
output[i] = byteToul(input[j])
| (byteToul(input[j + 1]) << 8)
| (byteToul(input[j + 2]) << 16)
| (byteToul(input[j + 3]) << 24);
return;
}
}
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