如何使用RFC1321中MD5加密

参照RFC1321添加三个文件：global.h md5.h md5.c

global.h：

/* GLOBAL.H - RSAREF 类型和常数*/
/* 当且仅当编译器支持函数原型的声明时，PROTOTYPES必须被设置一次
如果还没有定义C编译器的标记，下面的代码使PROTOTYPES置为0。*/
#ifndef PROTOTYPES
#define PROTOTYPES 1
#endif

/* POINTER 定义成一个普通的指针类型 */
typedef unsigned char *POINTER;

/* UINT2 定义成两字节的字 */
typedef unsigned short int UINT2;

/* UINT4定一成四字节的字 */
typedef unsigned long int UINT4;

/* PROTO_LIST的定义依赖于上面PROTOTYPES的定义，如果使用了PROTOTYPES，那么
PROTO_LIST返回此列表，否则返回一个空列表。*/
#if PROTOTYPES
#define PROTO_LIST(list) list
#else
#define PROTO_LIST(list) ()
#endif

md5.h：在C++中引用时需定义__cplusplus

/*MD5.H - MD5C.C头文件*/
/*本软件允许被复制或运用，但必须在所有提及和参考的地方标注"RSA Data Security, Inc. MD5
Message-Digest Algorithm"，也允许产生或运用派生软件，但必须在所有提及和参考的地方标明
"derived from the RSA Data Security, Inc. MD5 Message-Digest Algorithm"
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。
此声明必须在任何此文件和软件的任何拷贝中保留。*/

#ifdef __cplusplus
extern "C" {
#endif

/* MD5 context. */
#include "global.h"

typedef struct
{
unsigned int state[4]; /* state (ABCD) */
unsigned int count[2]; /* 位数量, 模 2^64 (低位在前) */
unsigned char buffer[64]; /* 输入缓冲器 */
} MD5_CTX;

void MD5Init PROTO_LIST ((MD5_CTX *));
void MD5Update PROTO_LIST
((MD5_CTX *, unsigned char *, unsigned int));
void MD5Final PROTO_LIST ((unsigned char [16], MD5_CTX *));

#ifdef __cplusplus
}
#endif

md5.c：

/* MD5C.C - RSA数据安全公司，MD5报文摘要算法*/
/*本软件允许被复制或运用，但必须在所有提及和参考的地方标注"RSA Data Security, Inc. MD5
Message-Digest Algorithm"也允许产生或运用派生软件，但必须在所有提及和参考的地方标明
"derived from the RSA Data 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。
此声明必须在任何此文件和软件的任何拷贝中保留。*/

#include "global.h"
#include "md5.h"

/* Constants for MD5Transform routine.
*/

#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21

static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

static unsigned char PADDING[64] = {
0x80, 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
};

/* F, G, H 和 I 是基本MD5函数 */
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))

/* ROTATE_LEFT 将x循环左移n位 */
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

/* 循环从加法中分离出是为了防止重复计算*/
#define FF(a, b, c, d, x, s, ac) { /
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); /
(a) = ROTATE_LEFT ((a), (s)); /
(a) += (b); /
}
#define GG(a, b, c, d, x, s, ac) { /
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); /
(a) = ROTATE_LEFT ((a), (s)); /
(a) += (b); /
}
#define HH(a, b, c, d, x, s, ac) { /
(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); /
(a) = ROTATE_LEFT ((a), (s)); /
(a) += (b); /
}
#define II(a, b, c, d, x, s, ac) { /
(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); /
(a) = ROTATE_LEFT ((a), (s)); /
(a) += (b); /
}

/* MD5 初始化. 开始一个MD5操作写一个新的context. */
void MD5Init (context)
MD5_CTX *context; /* context */
{
context->count[0] = context->count[1] = 0;
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}

/*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. */
void MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
unsigned char *input; /* 输入分组*/
unsigned int inputLen; /* 输入的分组的长度 */
{
unsigned int i, index, partLen;

/* 计算字节数模64的值 */
index = (unsigned int)((context->count[0] >> 3) & 0x3F);

/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))

< ((UINT4)inputLen << 3))
context->count[1]++;
context->count[1] += ((UINT4)inputLen >> 29);

partLen = 64 - index;

/* 按能达到的最大次数转换*/
if (inputLen >= partLen) {
MD5_memcpy
((POINTER)&context->buffer[index], (POINTER)input, partLen);
MD5Transform (context->state, context->buffer);

for (i = partLen; i + 63 < inputLen; i += 64)
MD5Transform (context->state, &input[i]);

index = 0;
}
else
i = 0;

/* 缓冲器保留输入值 */
MD5_memcpy
((POINTER)&context->buffer[index], (POINTER)&input[i],
inputLen-i);
}

/* MD5 最终结果. 以一个 MD5 报文摘要操作结束, 写下报文摘要值 */
void MD5Final (digest, context)
unsigned char digest[16]; /*报文摘要 */
MD5_CTX *context; /* context */
{
unsigned char bits[8];
unsigned int index, padLen;

/* 保存位数值 */
Encode (bits, context->count, 8);
index = (unsigned int)((context->count[0] >> 3) & 0x3f);
padLen = (index < 56) ? (56 - index) : (120 - index);
MD5Update (context, PADDING, padLen);

/* 附加长度 (在补位之前) */
MD5Update (context, bits, 8);

/* 将 state 存入 digest 中*/
Encode (digest, context->state, 16);
MD5_memset ((POINTER)context, 0, sizeof (*context));
}

/* MD5基本转换. 转换状态基于分组*/
static void MD5Transform (state, block)
UINT4 state[4];
unsigned char block[64];
{
UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];

Decode (x, block, 64);

/* Round 1 */
FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */

/* Round 2 */
GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */

GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */

/* Round 3 */
HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */

/* Round 4 */
II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */

state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;

MD5_memset ((POINTER)x, 0, sizeof (x));
}

/* 将输入（UINT4）编码输出(unsigned char). 假设len是4的倍数 */
static void Encode (output, input, len)
unsigned char *output;
UINT4 *input;
unsigned int len;
{
unsigned int i, j;

for (i = 0, j = 0; j < len; i++, j += 4) {
output[j] = (unsigned char)(input[i] & 0xff);
output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
}
}

/* 将输入(unsigned char)解码输出 (UINT4). 假设len是4的倍数 */
static void Decode (output, input, len)
UINT4 *output;
unsigned char *input;
unsigned int len;
{
unsigned int i, j;

for (i = 0, j = 0; j < len; i++, j += 4)
output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
(((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
}

static void MD5_memcpy (output, input, len)
POINTER output;
POINTER input;
unsigned int len;
{
unsigned int i;

for (i = 0; i < len; i++)

output[i] = input[i];
}

static void MD5_memset (output, value, len)
POINTER output;
int value;
unsigned int len;
{
unsigned int i;

for (i = 0; i < len; i++)
((char *)output)[i] = (char)value;
}

文件添加后在程序中添加：

#include "md5.h"

#define HASHLEN 16
typedef char HASH[HASHLEN];
#define HASHHEXLEN 32
typedef char HASHHEX[HASHHEXLEN + 1];

计算MD5的代码为：

MD5_CTX Md5Ctx1;
HASH HA1;
HASHHEX HAHEX1;
MD5Init(&Md5Ctx1);
MD5Update(&Md5Ctx1,(unsigned char *)name,strlen(name));
MD5Update(&Md5Ctx1,(unsigned char *)":",1);
MD5Update(&Md5Ctx1,(unsigned char *)realm,strlen(realm));
MD5Update(&Md5Ctx1,(unsigned char *)":",1);
MD5Update(&Md5Ctx1,(unsigned char *)pwd,strlen(pwd));
MD5Final((unsigned char *)HA1,&Md5Ctx1);
CvtHex (HA1, HAHEX1);
printf(HAHEX1);
printf("/n");

其中CvtHex 函数是转字符串显示：

void CvtHex (IN HASH Bin, OUT HASHHEX Hex)
{
unsigned short i;
unsigned char j;

for (i = 0; i < HASHLEN; i++)
{
j = (Bin[i] >> 4) & 0xf;
if (j <= 9)
Hex[i * 2] = (j + '0');
else
Hex[i * 2] = (j + 'a' - 10);
j = Bin[i] & 0xf;
if (j <= 9)
Hex[i * 2 + 1] = (j + '0');
else
Hex[i * 2 + 1] = (j + 'a' - 10);
};
Hex[HASHHEXLEN] = '/0';
}

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