📄 rfc1321---md5报文摘要算法--中文版.htm
字号:
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,<BR> 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,<BR> 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0<BR>};</P>
<P>/* F, G, H 和 I 是基本MD5函数 */<BR>#define F(x, y, z) (((x) & (y)) | ((~x)
& (z)))<BR>#define G(x, y, z) (((x) & (z)) | ((y) &
(~z)))<BR>#define H(x, y, z) ((x) ^ (y) ^ (z))<BR>#define I(x, y, z) ((y) ^ ((x)
| (~z)))</P>
<P>/* ROTATE_LEFT 将x循环左移n位 */<BR>#define ROTATE_LEFT(x, n) (((x) << (n)) |
((x) >> (32-(n))))</P>
<P>/* 循环从加法中分离出是为了防止重复计算*/<BR>#define FF(a, b, c, d, x, s, ac) { \<BR> (a)
+= F ((b), (c), (d)) + (x) + (UINT4)(ac); \<BR> (a) = ROTATE_LEFT ((a),
(s)); \</P>
<P> (a) += (b); \<BR> }<BR>#define GG(a, b, c, d, x, s, ac) {
\<BR> (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \<BR> (a) =
ROTATE_LEFT ((a), (s)); \<BR> (a) += (b); \<BR> }<BR>#define HH(a, b,
c, d, x, s, ac) { \<BR> (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac);
\<BR> (a) = ROTATE_LEFT ((a), (s)); \<BR> (a) += (b); \<BR>
}<BR>#define II(a, b, c, d, x, s, ac) { \<BR> (a) += I ((b), (c), (d)) +
(x) + (UINT4)(ac); \<BR> (a) = ROTATE_LEFT ((a), (s)); \<BR> (a) +=
(b); \<BR> }</P>
<P>/* MD5 初始化. 开始一个MD5操作写一个新的context. */<BR>void MD5Init (context)<BR>MD5_CTX
*context;
/* context */<BR>{<BR> context->count[0] = context->count[1] =
0;<BR> context->state[0] = 0x67452301;<BR> context->state[1] =
0xefcdab89;<BR> context->state[2] = 0x98badcfe;<BR>
context->state[3] = 0x10325476;<BR>}</P>
<P>/*MD5 分组更新操作. 继续一个MD5操作,处理另一个消息分组并更新context. */<BR>void MD5Update (context,
input, inputLen)<BR>MD5_CTX
*context;
/* context */<BR>unsigned char
*input;
/* 输入分组*/<BR>unsigned int
inputLen;
/* 输入的分组的长度 */<BR>{<BR> unsigned int i, index, partLen;</P>
<P> /* 计算字节数模64的值 */<BR> index = (unsigned
int)((context->count[0] >> 3) & 0x3F);</P>
<P> /* Update number of bits */<BR> if ((context->count[0] +=
((UINT4)inputLen << 3))</P>
<P> < ((UINT4)inputLen <<
3))<BR> context->count[1]++;<BR> context->count[1] +=
((UINT4)inputLen >> 29);</P>
<P> partLen = 64 - index;</P>
<P> /* 按能达到的最大次数转换*/<BR> if (inputLen >=
partLen) {<BR> MD5_memcpy<BR>
((POINTER)&context->buffer[index], (POINTER)input,
partLen);<BR> MD5Transform (context->state, context->buffer);</P>
<P> for (i = partLen; i + 63 < inputLen; i += 64)<BR>
MD5Transform (context->state, &input[i]);</P>
<P> index = 0;<BR> }<BR> else<BR> i = 0;</P>
<P> /* 缓冲器保留输入值 */<BR>
MD5_memcpy<BR> ((POINTER)&context->buffer[index],
(POINTER)&input[i],<BR> inputLen-i);<BR>}</P>
<P>/* MD5 最终结果. 以一个 MD5 报文摘要操作结束, 写下报文摘要值 */<BR>void MD5Final (digest,
context)<BR>unsigned char
digest[16];
/*报文摘要 */<BR>MD5_CTX
*context;
/* context */<BR>{<BR> unsigned char bits[8];<BR> unsigned int
index, padLen;</P>
<P> /* 保存位数值 */<BR> Encode (bits, context->count,
8);<BR> index = (unsigned int)((context->count[0] >> 3) &
0x3f);<BR> padLen = (index < 56) ? (56 - index) : (120 -
index);<BR> MD5Update (context, PADDING, padLen);</P>
<P> /* 附加长度 (在补位之前) */<BR> MD5Update (context, bits, 8);</P>
<P> /* 将 state 存入 digest 中*/<BR> Encode (digest, context->state,
16);<BR> MD5_memset ((POINTER)context, 0, sizeof (*context));<BR>}</P>
<P>/* MD5基本转换. 转换状态基于分组*/<BR>static void MD5Transform (state, block)<BR>UINT4
state[4];<BR>unsigned char block[64];<BR>{<BR> UINT4 a = state[0], b =
state[1], c = state[2], d = state[3], x[16];</P>
<P> Decode (x, block, 64);</P>
<P> /* Round 1 */<BR> FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1
*/<BR> FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */<BR> FF (c,
d, a, b, x[ 2], S13, 0x242070db); /* 3 */<BR> FF (b, c, d, a, x[ 3], S14,
0xc1bdceee); /* 4 */<BR> FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5
*/<BR> FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */<BR> FF (c,
d, a, b, x[ 6], S13, 0xa8304613); /* 7 */<BR> FF (b, c, d, a, x[ 7], S14,
0xfd469501); /* 8 */<BR> FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9
*/<BR> FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */<BR> FF (c,
d, a, b, x[10], S13, 0xffff5bb1); /* 11 */<BR> FF (b, c, d, a, x[11], S14,
0x895cd7be); /* 12 */<BR> FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13
*/<BR> FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */<BR> FF (c,
d, a, b, x[14], S13, 0xa679438e); /* 15 */<BR> FF (b, c, d, a, x[15], S14,
0x49b40821); /* 16 */</P>
<P> /* Round 2 */<BR> GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17
*/<BR> GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */<BR> GG (c,
d, a, b, x[11], S23, 0x265e5a51); /* 19 */<BR> GG (b, c, d, a, x[ 0], S24,
0xe9b6c7aa); /* 20 */<BR> GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21
*/<BR> GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */<BR> GG
(c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */<BR> GG (b, c, d, a, x[ 4],
S24, 0xe7d3fbc8); /* 24 */<BR> GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /*
25 */<BR> GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */<BR> GG
(c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */</P>
<P> GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */<BR> GG (a, b,
c, d, x[13], S21, 0xa9e3e905); /* 29 */<BR> GG (d, a, b, c, x[ 2], S22,
0xfcefa3f8); /* 30 */<BR> GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31
*/<BR> GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */</P>
<P> /* Round 3 */<BR> HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33
*/<BR> HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */<BR> HH (c,
d, a, b, x[11], S33, 0x6d9d6122); /* 35 */<BR> HH (b, c, d, a, x[14], S34,
0xfde5380c); /* 36 */<BR> HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37
*/<BR> HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */<BR> HH (c,
d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */<BR> HH (b, c, d, a, x[10], S34,
0xbebfbc70); /* 40 */<BR> HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41
*/<BR> HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */<BR> HH (c,
d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */<BR> HH (b, c, d, a, x[ 6],
S34, 0x4881d05); /* 44 */<BR> HH (a, b, c, d, x[ 9], S31,
0xd9d4d039); /* 45 */<BR> HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46
*/<BR> HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */<BR> HH (b,
c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */</P>
<P> /* Round 4 */<BR> II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49
*/<BR> II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */<BR> II (c,
d, a, b, x[14], S43, 0xab9423a7); /* 51 */<BR> II (b, c, d, a, x[ 5], S44,
0xfc93a039); /* 52 */<BR> II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53
*/<BR> II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */<BR> II (c,
d, a, b, x[10], S43, 0xffeff47d); /* 55 */<BR> II (b, c, d, a, x[ 1], S44,
0x85845dd1); /* 56 */<BR> II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57
*/<BR> II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */<BR> II (c,
d, a, b, x[ 6], S43, 0xa3014314); /* 59 */<BR> II (b, c, d, a, x[13], S44,
0x4e0811a1); /* 60 */<BR> II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61
*/<BR> II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */<BR> II (c,
d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */<BR> II (b, c, d, a, x[ 9], S44,
0xeb86d391); /* 64 */</P>
<P> state[0] += a;<BR> state[1] += b;<BR> state[2] +=
c;<BR> state[3] += d;</P>
<P> <BR> MD5_memset ((POINTER)x, 0, sizeof (x));<BR>}</P>
<P>/* 将输入（UINT4）编码输出(unsigned char). 假设len是4的倍数 */<BR>static void Encode
(output, input, len)<BR>unsigned char *output;<BR>UINT4 *input;<BR>unsigned int
len;<BR>{<BR> unsigned int i, j;</P>
<P> for (i = 0, j = 0; j < len; i++, j += 4) {<BR> output[j] =
(unsigned char)(input[i] & 0xff);<BR> output[j+1] = (unsigned
char)((input[i] >> 8) & 0xff);<BR> output[j+2] = (unsigned
char)((input[i] >> 16) & 0xff);<BR> output[j+3] = (unsigned
char)((input[i] >> 24) & 0xff);<BR> }<BR>}</P>
<P>/* 将输入(unsigned char)解码输出 (UINT4). 假设len是4的倍数 */<BR>static void Decode
(output, input, len)<BR>UINT4 *output;<BR>unsigned char *input;<BR>unsigned int
len;<BR>{<BR> unsigned int i, j;</P>
<P> for (i = 0, j = 0; j < len; i++, j += 4)<BR> output[i] =
((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |<BR>
(((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) <<
24);<BR>}<BR>static void MD5_memcpy (output, input, len)<BR>POINTER
output;<BR>POINTER input;<BR>unsigned int len;<BR>{<BR> unsigned int
i;</P>
<P> for (i = 0; i < len; i++)</P>
<P> output[i] = input[i];<BR>}<BR>static void MD5_memset (output, value,
len)<BR>POINTER output;<BR>int value;<BR>unsigned int len;<BR>{<BR>
unsigned int i;</P>
<P> for (i = 0; i < len; i++)<BR> ((char *)output)[i] =
(char)value;<BR>}</P>
<P>A.4 mddriver.c</P>
<P>/* MDDRIVER.C - MD2, MD4 and MD5测试程序 */<BR>/* RSA数据安全公司（RSA Data Security,
Inc.）从来没有出于任何特定目的陈述过关于此软<BR>件的可买性和实用性，它提供了“as
is”,没有表达或暗示过任何理由。<BR>此声明必须在任何此文件和软件的任何拷贝中保留。*/<BR>/* 如果没有定义C编译标志的值，则MD5缺省状态下为MD5
*/<BR>#ifndef MD<BR>#define MD MD5<BR>#endif</P>
<P>#include <stdio.h><BR>#include <time.h><BR>#include
<string.h><BR>#include "global.h"<BR>#if MD == 2<BR>#include
"md2.h"<BR>#endif<BR>#if MD == 4<BR>#include "md4.h"<BR>#endif<BR>#if MD ==
5<BR>#include "md5.h"<BR>#endif</P>
<P>/* 测试分组长度和数量 */<BR>#define TEST_BLOCK_LEN 1000<BR>#define TEST_BLOCK_COUNT
1000</P>
<P>static void MDString PROTO_LIST ((char *));<BR>static void MDTimeTrial
PROTO_LIST ((void));<BR>static void MDTestSuite PROTO_LIST ((void));<BR>static
void MDFile PROTO_LIST ((char *));<BR>static void MDFilter PROTO_LIST
((void));<BR>static void MDPrint PROTO_LIST ((unsigned char [16]));</P>
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