1、 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; stati
2、c 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 ; /* 下面之三个成员是MD5计算过程中用到之3个核心数据,在原始之C实现中 被定义到MD5_CTX结构中 */ private long state = new long4; / state (ABCD) private long count = new long2;
3、/ number of bits, modulo 264 (lsb first) private byte buffer = new byte64; / input buffer/* digestHexStr是MD5之唯一一个公共成员,是最新一次计算结果之 16进制ASCII表示.*/ public String digestHexStr; /* digest,是最新一次计算结果之2进制内部表示,表示128bit之MD5值. private byte digest = new byte16;/*getMD5ofStr是类MD5最主要之公共方法,入口参数是你想要进行MD5变换之字符串返回之是变换
4、完之结果,这个结果是从公共成员digestHexStr取得之 public String getMD5ofStr(String inbuf) md5Init(); md5Update(inbuf.getBytes(), inbuf.length(); md5Final(); digestHexStr = ; for (int i = 0; i 16; i+) digestHexStr += byteHEX(digesti); return digestHexStr; / 这是MD5这个类之标准构造函数,JavaBean要求有一个public之并且没有参数之构造函数 public MD5() r
5、eturn; /* md5Init是一个初始化函数,初始化核心变量,装入标准之幻数 */ private void md5Init() count0 = 0L; count1 = 0L; /* Load magic initialization constants. state0 = 0x67452301L; state1 = 0xefcdab89L; state2 = 0x98badcfeL; state3 = 0x10325476L; /* F, G, H ,I 是4个基本之MD5函数,在原始之MD5之C实现中,由于它们是 简单之位运算,可能出于效率之考虑把它们实现成了宏,在java中,我
6、们把它们 实现成了private方法,名字保持了原来C中之。 private long F(long x, long y, long z) return (x & y) | (x) & z); private long G(long x, long y, long z) 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); /* FF,GG,HH和II将调用F,G,H,I进行近一步变换 FF, GG
7、, HH, and II transformations for rounds 1, 2, 3, and 4. Rotation is separate from addition to prevent recomputation. */ 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 (32 - s); a += b; return a; private long GG(long a, long b, long c,
8、long d, long x, long s, a += G (b, c, d) + x + ac; private long HH(long a, long b, long c, long d, long x, long s, a += H (b, c, d) + x + ac; private long II(long a, long b, long c, long d, long x, long s, a += I (b, c, d) + x + ac; /* md5Update是MD5之主计算过程,inbuf是要变换之字节串,inputlen是长度,这个 函数由getMD5ofStr调
9、用,调用之前需要调用md5init,因此把它设计成private之 private void md5Update(byte inbuf, int inputLen) int i, index, partLen; byte block = new byte64; index = (int)(count0 3) & 0x3F; / /* Update number of bits */ if (count0 += (inputLen 3) (inputLen 29); partLen = 64 - index; / Transform as many times as possible. if (
10、inputLen = partLen) md5Memcpy(buffer, inbuf, index, 0, partLen); md5Transform(buffer); for (i = partLen; i + 63 inputLen; i += 64) md5Memcpy(block, inbuf, 0, i, 64); md5Transform (block); index = 0; else i = 0; /* Buffer remaining input */ md5Memcpy(buffer, inbuf, index, i, inputLen - i); md5Final整理
11、和填写输出结果 private void md5Final () byte bits = new byte8; int index, padLen; /* Save number of bits */ Encode (bits, count, 8); /* Pad out to 56 mod 64. 0x3f; padLen = (index 56) ? (56 - index) : (120 - index); md5Update (PADDING, padLen); /* Append length (before padding) */ md5Update(bits, 8); /* St
12、ore state in digest */ Encode (digest, state, 16); /* md5Memcpy是一个内部使用之byte数组之块拷贝函数,从input之inpos开始把len长度之 字节拷贝到output之outpos位置开始 private void md5Memcpy (byte output, byte input, int outpos, int inpos, int len) int i; for (i = 0; len; i+) outputoutpos + i = inputinpos + i; md5Transform是MD5核心变换程序,有md5
13、Update调用,block是分块之原始字节 private void md5Transform (byte block) long a = state0, b = state1, c = state2, d = state3; long x = new long16; Decode (x, block, 64); /* Round 1 */ a = FF (a, b, c, d, x0, S11, 0xd76aa478L); /* 1 */ d = FF (d, a, b, c, x1, S12, 0xe8c7b756L); /* 2 */ c = FF (c, d, a, b, x2, S
14、13, 0x242070dbL); /* 3 */ b = FF (b, c, d, a, x3, S14, 0xc1bdceeeL); /* 4 */ a = FF (a, b, c, d, x4, S11, 0xf57c0fafL); /* 5 */ d = FF (d, a, b, c, x5, S12, 0x4787c62aL); /* 6 */ c = FF (c, d, a, b, x6, S13, 0xa8304613L); /* 7 */ b = FF (b, c, d, a, x7, S14, 0xfd469501L); /* 8 */ a = FF (a, b, c, d,
15、 x8, S11, 0x698098d8L); /* 9 */ d = FF (d, a, b, c, x9, S12, 0x8b44f7afL); /* 10 */ c = FF (c, d, a, b, x10, S13, 0xffff5bb1L); /* 11 */ b = FF (b, c, d, a, x11, S14, 0x895cd7beL); /* 12 */ a = FF (a, b, c, d, x12, S11, 0x6b901122L); /* 13 */ d = FF (d, a, b, c, x13, S12, 0xfd987193L); /* 14 */ c =
16、FF (c, d, a, b, x14, S13, 0xa679438eL); /* 15 */ b = FF (b, c, d, a, x15, S14, 0x49b40821L); /* 16 */ /* Round 2 */ a = GG (a, b, c, d, x1, S21, 0xf61e2562L); /* 17 */ d = GG (d, a, b, c, x6, S22, 0xc040b340L); /* 18 */ c = GG (c, d, a, b, x11, S23, 0x265e5a51L); /* 19 */ b = GG (b, c, d, a, x0, S24
17、, 0xe9b6c7aaL); /* 20 */ a = GG (a, b, c, d, x5, S21, 0xd62f105dL); /* 21 */ d = GG (d, a, b, c, x10, S22, 0x2441453L); /* 22 */ c = GG (c, d, a, b, x15, S23, 0xd8a1e681L); /* 23 */ b = GG (b, c, d, a, x4, S24, 0xe7d3fbc8L); /* 24 */ a = GG (a, b, c, d, x9, S21, 0x21e1cde6L); /* 25 */ d = GG (d, a,
18、b, c, x14, S22, 0xc33707d6L); /* 26 */ c = GG (c, d, a, b, x3, S23, 0xf4d50d87L); /* 27 */ b = GG (b, c, d, a, x8, S24, 0x455a14edL); /* 28 */ a = GG (a, b, c, d, x13, S21, 0xa9e3e905L); /* 29 */ d = GG (d, a, b, c, x2, S22, 0xfcefa3f8L); /* 30 */ c = GG (c, d, a, b, x7, S23, 0x676f02d9L); /* 31 */ b = GG (b, c, d, a, x12, S24, 0x8d2a4c8aL); /* 32 */ /* Round 3 */ a = HH (a, b, c, d, x5, S31, 0xfffa3942L); /* 33 */ d = HH (d, a, b, c, x
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