MD5数字签名 针对字符串 或 文件 生成32位字符的签名 比较两个文件或字符串 只需比较MD5签名就行了 能迅速比较出两个字符串或文件的异同。看代码吧
- ifndef __HAVE_MD5_H__
- #define __HAVE_MD5_H__
- #ifndef PROTOTYPES
- #define PROTOTYPES 0
- #endif
- #if PROTOTYPES
- #define PROTO_LIST(list) list
- #else
- #define PROTO_LIST(list) ()
- #endif
- /* 定义POINTER类型 */
- typedef unsigned char *POINTER;
- /* 定义UINT2类型 */
- typedef unsigned short int UINT2;
- /* 定义UINT4类型 */
- typedef unsigned long int UINT4;
- /* MD5上下文 */
- typedef struct
- {
- UINT4 state[4];
- UINT4 count[2];
- unsigned char buffer[64]; /* 输入缓冲区 */
- } 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 *));
- #endif
-------------------------------------------------------------------------------
- #include "md5.h"
- /*
- * MD5Transform函数中的常量
- */
- #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 and I MD5基本功能函数
- */
- #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 旋转x的左边bits
- */
- #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
- #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); \
- }
- /*
- * MD5Init: MD5初始化,开始MD5的新操作
- *
- * @context:MD5参数
- *
- * @return:
- */
- void MD5Init(MD5_CTX *context)
- {
- context->count[0] = context->count[1] = 0;
- /* 载入MD5常量 */
- context->state[0] = 0x67452301;
- context->state[1] = 0xefcdab89;
- context->state[2] = 0x98badcfe;
- context->state[3] = 0x10325476;
- }
- /*
- * MD5Update:MD5块更新操作,持续的MD5消息摘要操作,处理另一个消息块,并更新上下文
- *
- * @content:摘要信息块
- * @input:输入信息快
- * @inputLen:输入信息块长度
- *
- * @return:
- */
- void MD5Update (MD5_CTX *context, unsigned char *input, unsigned int inputLen)
- {
- unsigned int i, index, partLen;
- /* 计算64位的信息摘要 */
- index = (unsigned int)((context->count[0] >> 3) & 0x3F);
- /* 更新数据位 */
- if((context->count[0] += ((UINT4)inputLen << 3)) < ((UINT4)inputLen << 3))
- context->count[1]++;
- context->count[1] += ((UINT4)inputLen >> 29);
- partLen = 64 - index;
- /* 转化可能多的次数 */
- 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;
- }
- /* 缓冲区中的剩余输入 */
- MD5_memcpy((POINTER)&context->buffer[index], (POINTER)&input[i],inputLen-i);
- }
- /*
- * MD5Final:完成MD5信息摘要操作,书写消息摘要和初始化上下文
- *
- * @digest:信息摘要
- * @content:信息块
- *
- * @return:
- */
- void MD5Final(unsigned char digest[16], MD5_CTX *context)
- {
- unsigned char bits[8];
- unsigned int index, padLen;
- /* 保存数字摘要位 */
- Encode (bits, context->count, 8);
- /* 填充56位到64位 */
- index = (unsigned int)((context->count[0] >> 3) & 0x3f);
- padLen = (index < 56) ? (56 - index) : (120 - index);
- MD5Update (context, PADDING, padLen);
- /* 添加长度 */
- MD5Update (context, bits, 8);
- /* 存储摘要 */
- Encode (digest, context->state, 16);
- /* 清零摘要上下文 */
- MD5_memset ((POINTER)context, 0, sizeof (*context));
- }
- /*
- * MD5Transform:MD5基本转化
- *
- * @state:基本状态转化
- * @block:转化数据块
- *
- * @return:
- */
- static void MD5Transform (UINT4 state[4], unsigned char block[64])
- {
- UINT4 a, b, c, d, x[16];
- a = state[0];
- b = state[1];
- c = state[2];
- d = state[3];
-
- Decode (x, block, 64);
- /* 第一轮 */
- 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 */
- /* 第二轮 */
- 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 */
- /* 第三轮 */
- 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 */
- /* 第四轮 */
- 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));
- }
- /* Encodes input (UINT4) into output (unsigned char). Assumes len is
- a multiple of 4.
- */
- static void Encode(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);
- }
- }
- /*
- * Decode: 解码(unsigned char)到输出(UINT4)
- *
- * @output:输出串
- * @input:输入串
- * @len:输入串长度
- *
- * @return:
- */
- static void Decode(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);
- }
- /*
- * MD5_memcpy:字符串拷贝
- *
- * @output:输出字符串
- * @input:输入字符串
- * @len:字符串的长度
- *
- * @return:
- */
- static void MD5_memcpy (POINTER output, POINTER input, unsigned int len)
- {
- unsigned int i;
- for (i = 0; i < len; i++)
- output[i] = input[i];
- }
- /*
- * MD5_memset:这个都知道
- *
- * @output:输出字符串
- * @value:赋值
- * @len:输出字符串的长度
- *
- * @return:
- */
- static void MD5_memset (POINTER output, int value, unsigned int len)
- {
- unsigned int i;
- for (i = 0; i < len; i++)
- ((char *)output)[i] = (char)value;
- }
--------------------------------------------------------------------------------------
- #ifndef MD
- #define MD5 5
- #define MD MD5
- #endif
- #include <stdio.h>
- #include <time.h>
- #include <string.h>
- #if MD == 2
- #include "md2.h"
- #endif
- #if MD == 4
- #include "md4.h"
- #endif
- #if MD == 5
- #include "md5.h"
- #endif
- #define TEST_BLOCK_LEN 1500
- #define TEST_BLOCK_COUNT 1500
- static void MDString PROTO_LIST ((char *));
- static void MDTimeTrial PROTO_LIST ((void));
- static void MDTestSuite PROTO_LIST ((void));
- static void MDFile PROTO_LIST ((char *));
- static void MDFilter PROTO_LIST ((void));
- static void MDPrint PROTO_LIST ((unsigned char [16]));
- #if MD == 2
- #define MD_CTX MD2_CTX
- #define MDInit MD2Init
- #define MDUpdate MD2Update
- #define MDFinal MD2Final
- #endif
- #if MD == 4
- #define MD_CTX MD4_CTX
- #define MDInit MD4Init
- #define MDUpdate MD4Update
- #define MDFinal MD4Final
- #endif
- #if MD == 5
- #define MD_CTX MD5_CTX
- #define MDInit MD5Init
- #define MDUpdate MD5Update
- #define MDFinal MD5Final
- #endif
- /* Main driver.
- Arguments (may be any combination):
- -sstring - 摘要串
- -t - 运行时间测试
- -x - 运行测试脚本
- filename - 摘要文件
- (none) - 摘要标准输入
- */
- int main (int argc, char *argv[])
- {
- int i;
- if (argc > 1)
- for (i = 1; i < argc; i++)
- if (argv[i][0] == '-' && argv[i][1] == 's')
- MDString (argv[i] + 2);
- else if (strcmp (argv[i], "-t") == 0)
- MDTimeTrial ();
- else if (strcmp (argv[i], "-x") == 0)
- MDTestSuite ();
- else
- MDFile (argv[i]);
- else
- MDFilter ();
- return (0);
- }
- /*
- * MDString:将字符串转化为MD5字符串(摘要串)
- *
- * @string:被摘要的字符串
- *
- * @return:
- *
- * NOTE:将字符串转化为摘要串并输出,用的选项为-s
- */
- static void MDString(char *string)
- {
- MD_CTX context;
- unsigned char digest[16];
- unsigned int len = strlen(string);
- MDInit(&context);
- MDUpdate(&context, string, len);
- MDFinal(digest, &context);
- printf ("MD%d (\"%s\") = ", MD, string);
- MDPrint (digest);
- printf ("\n");
- }
- /*
- * MDTimeTrial:摘要时间测试并输出
- *
- * @return:
- */
- static void MDTimeTrial()
- {
- MD_CTX context;
- time_t endTime, startTime;
- unsigned char block[TEST_BLOCK_LEN], digest[16];
- unsigned int i;
- printf("MD%d time trial. Digesting %d %d-byte blocks ...", MD,
- TEST_BLOCK_LEN, TEST_BLOCK_COUNT);
- /* 初始化数据块 */
- for (i = 0; i < TEST_BLOCK_LEN; i++)
- block[i] = (unsigned char)(i & 0xff);
- /* 开始时间 */
- time (&startTime);
- /* 摘要信息块 */
- MDInit (&context);
- for (i = 0; i < TEST_BLOCK_COUNT; i++)
- MDUpdate (&context, block, TEST_BLOCK_LEN);
- MDFinal (digest, &context);
- /* 停止时间 */
- time (&endTime);
- printf ("done\n");
- printf ("Digest = ");
- MDPrint (digest);
- printf ("\nTime = %ld seconds\n", (long)(endTime-startTime));
- printf ("Speed = %ld bytes/second\n",
- (long)TEST_BLOCK_LEN * (long)TEST_BLOCK_COUNT/(endTime-startTime));
- }
- /*
- * MDTestSuite:测试MDString,测试脚本
- *
- * @return:
- */
- static void MDTestSuite()
- {
- printf ("MD%d test suite:\n", MD);
- MDString ("");
- MDString ("a");
- MDString ("abc");
- MDString ("message digest");
- MDString ("abcdefghijklmnopqrstuvwxyz");
- MDString ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789");
- MDString ("1234567890123456789012345678901234567890\
- 1234567890123456789012345678901234567890");
- }
- /*
- * MDFile:摘要文件并输出
- *
- * @filename:摘要文件名称
- *
- * @return:
- */
- static void MDFile(char *filename)
- {
- FILE *file;
- MD_CTX context;
- int len;
- unsigned char buffer[1024], digest[16];
- if ((file = fopen (filename, "rb")) == NULL)
- printf ("%s can't be opened\n", filename);
- else
- {
- MDInit (&context);
- while (len = fread (buffer, 1, 1024, file))
- MDUpdate (&context, buffer, len);
- MDFinal (digest, &context);
- fclose (file);
- printf ("MD%d (%s) = ", MD, filename);
- MDPrint (digest);
- printf ("\n");
- }
- }
- /*
- * MDFilter:摘要标准输入
- *
- * @return:
- */
- static void MDFilter()
- {
- MD_CTX context;
- int len;
- unsigned char buffer[16], digest[16];
- MDInit (&context);
- while (len = fread (buffer, 1, 16, stdin))
- MDUpdate (&context, buffer, len);
- MDFinal (digest, &context);
- MDPrint (digest);
- printf ("\n");
- }
- /*
- * MDPrint:以16进制输出信息摘要
- *
- * @digest:摘要信息
- *
- * @return:
- */
- static void MDPrint(unsigned char digest[16])
- {
- unsigned int i;
- for (i = 0; i < 16; i++)
- printf ("%02x", digest[i]);
- }
------------------------------------------------------------------------
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