MD5Digest
package com.shanhh.md5tools; | |
import java.io.UnsupportedEncodingException; | |
//实现MD5算法的类,提供一个静态的函数toMD5()供调用; | |
//还提供一个getMD5ofStr()函数生成一个MD5加密串; | |
public class MD5Digest { | |
static final int S11 = 7; | |
static final int S12 = 12; | |
static final int S13 = 17; | |
static final int S14 = 22; | |
static final int S21 = 5; | |
static final int S22 = 9; | |
static final int S23 = 14; | |
static final int S24 = 20; | |
static final int S31 = 4; | |
static final int S32 = 11; | |
static final int S33 = 16; | |
static final int S34 = 23; | |
static final int S41 = 6; | |
static final int S42 = 10; | |
static final int S43 = 15; | |
static final int S44 = 21; | |
static final byte PADDING[] = { -128, 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, 0, 0, 0, 0, 0, | |
0, 0, 0, 0, 0, 0, 0 }; | |
private long state[]; | |
private long count[]; | |
private byte buffer[]; | |
public String digestHexStr; | |
private byte digest[]; | |
public String getMD5ofStr(String s) throws UnsupportedEncodingException {// 返回MD5串; | |
int i; | |
md5Init(); | |
md5Update(s.getBytes(), s.length()); | |
md5Final(); | |
digestHexStr = ""; | |
for (i = 0; i < 16; i++) | |
digestHexStr = digestHexStr + byteHEX(digest[i]); | |
return digestHexStr; | |
} | |
public MD5Digest() { | |
state = new long[4]; | |
count = new long[2]; | |
buffer = new byte[64]; | |
digest = new byte[16]; | |
md5Init(); | |
} | |
private void md5Init() {// 初始化部分变量; | |
count[0] = 0L; | |
count[1] = 0L; | |
state[0] = 0x67452301L; | |
state[1] = 0xefcdab89L; | |
state[2] = 0x98badcfeL; | |
state[3] = 0x10325476L; | |
} | |
private long F(long l, long l1, long l2) { | |
return l & l1 | ~l & l2; | |
} | |
private long G(long l, long l1, long l2) { | |
return l & l2 | l1 & ~l2; | |
} | |
private long H(long l, long l1, long l2) { | |
return l ^ l1 ^ l2; | |
} | |
private long I(long l, long l1, long l2) { | |
return l1 ^ (l | ~l2); | |
} | |
private long FF(long l, long l1, long l2, long l3, long l4, long l5, long l6) { | |
l += F(l1, l2, l3) + l4 + l6; | |
l = (int) l << (int) l5 | (int) l >>> (int) (32L - l5); | |
l += l1; | |
return l; | |
} | |
private long GG(long l, long l1, long l2, long l3, long l4, long l5, long l6) { | |
l += G(l1, l2, l3) + l4 + l6; | |
l = (int) l << (int) l5 | (int) l >>> (int) (32L - l5); | |
l += l1; | |
return l; | |
} | |
private long HH(long l, long l1, long l2, long l3, long l4, long l5, long l6) { | |
l += H(l1, l2, l3) + l4 + l6; | |
l = (int) l << (int) l5 | (int) l >>> (int) (32L - l5); | |
l += l1; | |
return l; | |
} | |
private long II(long l, long l1, long l2, long l3, long l4, long l5, long l6) { | |
l += I(l1, l2, l3) + l4 + l6; | |
l = (int) l << (int) l5 | (int) l >>> (int) (32L - l5); | |
l += l1; | |
return l; | |
} | |
private void md5Update(byte abyte0[], int i) {// 补位操作,abyte0为需要进行MD5加密的字符串,i为字符串长度; | |
byte abyte1[] = new byte[64]; | |
int k = (int) (count[0] >>> 3) & 0x3f; | |
if ((count[0] += i << 3) < (long) (i << 3)) | |
count[1]++; | |
count[1] += i >>> 29; | |
int l = 64 - k; | |
int j; | |
if (i >= l) { | |
md5Memcpy(buffer, abyte0, k, 0, l); | |
md5Transform(buffer); | |
for (j = l; j + 63 < i; j += 64) { | |
md5Memcpy(abyte1, abyte0, 0, j, 64); | |
md5Transform(abyte1); | |
} | |
k = 0; | |
} else { | |
j = 0; | |
} | |
md5Memcpy(buffer, abyte0, k, j, i - j); | |
} | |
private void md5Final() {// 最终处理,将得到的128位(16字节)MD5码存放在digest数组中 | |
byte abyte0[] = new byte[8]; | |
encode(abyte0, count, 8); | |
int i = (int) (count[0] >>> 3) & 0x3f; | |
int j = i >= 56 ? 120 - i : 56 - i; | |
md5Update(PADDING, j); | |
md5Update(abyte0, 8); | |
encode(digest, state, 16); | |
} | |
private void md5Memcpy(byte abyte0[], byte abyte1[], int i, int j, int k) { | |
for (int l = 0; l < k; l++) | |
abyte0[i + l] = abyte1[j + l]; | |
} | |
private void md5Transform(byte abyte0[]) { | |
long l = state[0]; | |
long l1 = state[1]; | |
long l2 = state[2]; | |
long l3 = state[3]; | |
long al[] = new long[16]; | |
decode(al, abyte0, 64); | |
l = FF(l, l1, l2, l3, al[0], 7L, 0xd76aa478L); | |
l3 = FF(l3, l, l1, l2, al[1], 12L, 0xe8c7b756L); | |
l2 = FF(l2, l3, l, l1, al[2], 17L, 0x242070dbL); | |
l1 = FF(l1, l2, l3, l, al[3], 22L, 0xc1bdceeeL); | |
l = FF(l, l1, l2, l3, al[4], 7L, 0xf57c0fafL); | |
l3 = FF(l3, l, l1, l2, al[5], 12L, 0x4787c62aL); | |
l2 = FF(l2, l3, l, l1, al[6], 17L, 0xa8304613L); | |
l1 = FF(l1, l2, l3, l, al[7], 22L, 0xfd469501L); | |
l = FF(l, l1, l2, l3, al[8], 7L, 0x698098d8L); | |
l3 = FF(l3, l, l1, l2, al[9], 12L, 0x8b44f7afL); | |
l2 = FF(l2, l3, l, l1, al[10], 17L, 0xffff5bb1L); | |
l1 = FF(l1, l2, l3, l, al[11], 22L, 0x895cd7beL); | |
l = FF(l, l1, l2, l3, al[12], 7L, 0x6b901122L); | |
l3 = FF(l3, l, l1, l2, al[13], 12L, 0xfd987193L); | |
l2 = FF(l2, l3, l, l1, al[14], 17L, 0xa679438eL); | |
l1 = FF(l1, l2, l3, l, al[15], 22L, 0x49b40821L); | |
l = GG(l, l1, l2, l3, al[1], 5L, 0xf61e2562L); | |
l3 = GG(l3, l, l1, l2, al[6], 9L, 0xc040b340L); | |
l2 = GG(l2, l3, l, l1, al[11], 14L, 0x265e5a51L); | |
l1 = GG(l1, l2, l3, l, al[0], 20L, 0xe9b6c7aaL); | |
l = GG(l, l1, l2, l3, al[5], 5L, 0xd62f105dL); | |
l3 = GG(l3, l, l1, l2, al[10], 9L, 0x2441453L); | |
l2 = GG(l2, l3, l, l1, al[15], 14L, 0xd8a1e681L); | |
l1 = GG(l1, l2, l3, l, al[4], 20L, 0xe7d3fbc8L); | |
l = GG(l, l1, l2, l3, al[9], 5L, 0x21e1cde6L); | |
l3 = GG(l3, l, l1, l2, al[14], 9L, 0xc33707d6L); | |
l2 = GG(l2, l3, l, l1, al[3], 14L, 0xf4d50d87L); | |
l1 = GG(l1, l2, l3, l, al[8], 20L, 0x455a14edL); | |
l = GG(l, l1, l2, l3, al[13], 5L, 0xa9e3e905L); | |
l3 = GG(l3, l, l1, l2, al[2], 9L, 0xfcefa3f8L); | |
l2 = GG(l2, l3, l, l1, al[7], 14L, 0x676f02d9L); | |
l1 = GG(l1, l2, l3, l, al[12], 20L, 0x8d2a4c8aL); | |
l = HH(l, l1, l2, l3, al[5], 4L, 0xfffa3942L); | |
l3 = HH(l3, l, l1, l2, al[8], 11L, 0x8771f681L); | |
l2 = HH(l2, l3, l, l1, al[11], 16L, 0x6d9d6122L); | |
l1 = HH(l1, l2, l3, l, al[14], 23L, 0xfde5380cL); | |
l = HH(l, l1, l2, l3, al[1], 4L, 0xa4beea44L); | |
l3 = HH(l3, l, l1, l2, al[4], 11L, 0x4bdecfa9L); | |
l2 = HH(l2, l3, l, l1, al[7], 16L, 0xf6bb4b60L); | |
l1 = HH(l1, l2, l3, l, al[10], 23L, 0xbebfbc70L); | |
l = HH(l, l1, l2, l3, al[13], 4L, 0x289b7ec6L); | |
l3 = HH(l3, l, l1, l2, al[0], 11L, 0xeaa127faL); | |
l2 = HH(l2, l3, l, l1, al[3], 16L, 0xd4ef3085L); | |
l1 = HH(l1, l2, l3, l, al[6], 23L, 0x4881d05L); | |
l = HH(l, l1, l2, l3, al[9], 4L, 0xd9d4d039L); | |
l3 = HH(l3, l, l1, l2, al[12], 11L, 0xe6db99e5L); | |
l2 = HH(l2, l3, l, l1, al[15], 16L, 0x1fa27cf8L); | |
l1 = HH(l1, l2, l3, l, al[2], 23L, 0xc4ac5665L); | |
l = II(l, l1, l2, l3, al[0], 6L, 0xf4292244L); | |
l3 = II(l3, l, l1, l2, al[7], 10L, 0x432aff97L); | |
l2 = II(l2, l3, l, l1, al[14], 15L, 0xab9423a7L); | |
l1 = II(l1, l2, l3, l, al[5], 21L, 0xfc93a039L); | |
l = II(l, l1, l2, l3, al[12], 6L, 0x655b59c3L); | |
l3 = II(l3, l, l1, l2, al[3], 10L, 0x8f0ccc92L); | |
l2 = II(l2, l3, l, l1, al[10], 15L, 0xffeff47dL); | |
l1 = II(l1, l2, l3, l, al[1], 21L, 0x85845dd1L); | |
l = II(l, l1, l2, l3, al[8], 6L, 0x6fa87e4fL); | |
l3 = II(l3, l, l1, l2, al[15], 10L, 0xfe2ce6e0L); | |
l2 = II(l2, l3, l, l1, al[6], 15L, 0xa3014314L); | |
l1 = II(l1, l2, l3, l, al[13], 21L, 0x4e0811a1L); | |
l = II(l, l1, l2, l3, al[4], 6L, 0xf7537e82L); | |
l3 = II(l3, l, l1, l2, al[11], 10L, 0xbd3af235L); | |
l2 = II(l2, l3, l, l1, al[2], 15L, 0x2ad7d2bbL); | |
l1 = II(l1, l2, l3, l, al[9], 21L, 0xeb86d391L); | |
state[0] += l; | |
state[1] += l1; | |
state[2] += l2; | |
state[3] += l3; | |
} | |
private void encode(byte abyte0[], long al[], int i) { | |
// 转换函数,将al中long型的变量输出到byte型的数组abyte0中, | |
// 低位字节在前,高位字节在后; | |
int j = 0; | |
for (int k = 0; k < i; k += 4) { | |
abyte0[k] = (byte) (int) (al[j] & 255L); | |
abyte0[k + 1] = (byte) (int) (al[j] >>> 8 & 255L); | |
abyte0[k + 2] = (byte) (int) (al[j] >>> 16 & 255L); | |
abyte0[k + 3] = (byte) (int) (al[j] >>> 24 & 255L); | |
j++; | |
} | |
} | |
private void decode(long al[], byte abyte0[], int i) { | |
int j = 0; | |
for (int k = 0; k < i; k += 4) { | |
al[j] = b2iu(abyte0[k]) | b2iu(abyte0[k + 1]) << 8 | |
| b2iu(abyte0[k + 2]) << 16 | b2iu(abyte0[k + 3]) << 24; | |
j++; | |
} | |
} | |
public static long b2iu(byte byte0) { | |
return byte0 >= 0 ? byte0 : byte0 & 0xff; | |
} | |
public static String byteHEX(byte byte0) {// 字节到十六进制的ASCII码转换 | |
char ac[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', | |
'B', 'C', 'D', 'E', 'F' }; | |
char ac1[] = new char[2]; | |
ac1[0] = ac[byte0 >>> 4 & 0xf]; | |
ac1[1] = ac[byte0 & 0xf]; | |
String s = new String(ac1); | |
return s; | |
} | |
public static String toMD5(String s) throws UnsupportedEncodingException { | |
MD5Digest md5 = new MD5Digest(); | |
return md5.getMD5ofStr(s); | |
} | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment