学步园

/*********md5.h************/<br /> #ifndef __MD5_H<br /> #define __MD5_H<br /> #ifndef PROTOTYPES<br /> #define PROTOTYPES 0<br /> #endif<br /> /* POINTER defines a generic pointer type */<br /> typedef unsigned char *POINTER;/* 无符号字符类型的指针类型 */<br /> /* UINT2 defines a two byte word */<br /> typedef unsigned short int UINT2; /* 无符号两字节的整数类型 */<br /> /* UINT4 defines a four byte word */<br /> typedef unsigned long int UINT4; /* 无符号四字节的整数类型 */<br /> /* PROTO_LIST is defined depending on how PROTOTYPES is defined above.<br /> If using PROTOTYPES, then PROTO_LIST returns the list, otherwise it<br /> returns an empty list. */<br /> #if PROTOTYPES<br /> #define PROTO_LIST(list) list /* 非空的列表 */<br /> #else<br /> #define PROTO_LIST(list) () /* 空列表 */<br /> #endif<br /> /* MD5 context. */<br /> typedef struct {<br /> UINT4 state[4]; /* state (ABCD) *//* 0 - 2的16次方*/<br /> UINT4 count[2]; /* number of bits, modulo 2^64 (lsb first) *//* 0 到2的8次方 */<br /> unsigned char buffer[64];/* input buffer *//* 输入缓冲区 容纳64个字符 */<br /> } MD5_CTX;<br /> void MD5Init(MD5_CTX *); /* 初始化一个MD5_CTX结构体指针 */<br /> void MD5Update(MD5_CTX *, unsigned char *, unsigned int);/* 更新MD5_CTX结构体中buffer域、count域 */<br /> void MD5Final(unsigned char [16], MD5_CTX *);/* 获取 */<br /> #endif<br /> /*******md5.c******定义常量***/<br /> #define S11 7<br /> #define S12 12<br /> #define S13 17<br /> #define S14 22<br /> #define S21 5<br /> #define S22 9<br /> #define S23 14<br /> #define S24 20<br /> #define S31 4<br /> #define S32 11<br /> #define S33 16<br /> #define S34 23<br /> #define S41 6<br /> #define S42 10<br /> #define S43 15<br /> #define S44 21<br /> static void MD5Transform(UINT4 [4], unsigned char [64]);/* 转换 */<br /> static void Encode(unsigned char *, UINT4 *, unsigned int);/* 编码 */<br /> static void Decode(UINT4 *, unsigned char *, unsigned int);/* 解码 */<br /> static void MD5_memcpy(POINTER, POINTER, unsigned int); /* 内存拷贝 */<br /> static void MD5_memset(POINTER, int, unsigned int); /* 内存设置 */<br /> static unsigned char PADDING[64] = { /* 64个字符常量 */<br /> 0x80, 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, 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 /> };<br /> /* F, G, H and I are basic MD5 functions. */<br /> #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))/* (x位与y)位或((位反x)位与z) */<br /> #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))/* (x位与z)位或(y位与(位反z)) */<br /> #define H(x, y, z) ((x) ^ (y) ^ (z)) /* x异或y异或z */<br /> #define I(x, y, z) ((y) ^ ((x) | (~z))) /* y异或(x位或(位反z)) */<br /> /* ROTATE_LEFT rotates x left n bits. */<br /> #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))/* x循环左移n位 针对32位整数 UINT4类型 */<br /> /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.<br /> Rotation is separate from addition to prevent recomputation. */<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)); / /* a - UINT4 s - */<br /> (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 /> }<br /> /* MD5 initialization. Begins an MD5 operation, writing a new context. *//* 初始化一个MD5_CTX类型的指针变量 */<br /> void MD5Init (context)<br /> MD5_CTX *context; /* context */<br /> {<br /> context->count[0] = context->count[1] = 0;/* 将高位和低位置零 */<br /> /* Load magic initialization constants.*/<br /> context->state[0] = 0x67452301; /* 初始化状态位 */<br /> context->state[1] = 0xefcdab89; /* 这是不是可以随便赋值的呢？ */<br /> context->state[2] = 0x98badcfe;<br /> context->state[3] = 0x10325476;<br /> }<br /> /* MD5 block update operation. Continues an MD5 message-digest<br /> operation, processing another message block, and updating the<br /> context. */<br /> void MD5Update (context, input, inputLen)<br /> MD5_CTX *context; /* context */<br /> unsigned char *input; /* input block */<br /> unsigned int inputLen; /* length of input block */<br /> {<br /> unsigned int i, index, partLen;<br /> /* Compute number of bytes mod 64 */<br /> index = (unsigned int)((context->count[0] >> 3) & 0x3F);/* 除8后位与0x3F 怎么说是64的模呢？ */<br /> /* Update number of bits *//* 更新 */<br /> if ((context->count[0] += ((UINT4)inputLen << 3))<br /> < ((UINT4)inputLen << 3))<br /> context->count[1]++;<br /> context->count[1] += ((UINT4)inputLen >> 29);<br /> partLen = 64 - index;<br /> /* Transform as many times as possible.*/<br /> if (inputLen >= partLen) {<br /> MD5_memcpy<br /> ((POINTER)&context->buffer[index], (POINTER)input, partLen);<br /> MD5Transform (context->state, context->buffer);<br /> for (i = partLen; i + 63 < inputLen; i += 64)<br /> MD5Transform (context->state, &input[i]);<br /> index = 0;<br /> }<br /> else<br /> i = 0;<br /> /* Buffer remaining input */<br /> MD5_memcpy<br /> ((POINTER)&context->buffer[index], (POINTER)&input[i],<br /> inputLen-i);<br /> }<br /> /* MD5 finalization. Ends an MD5 message-digest operation, writing the<br /> the message digest and zeroizing the context. */<br /> void MD5Final (digest, context)<br /> unsigned char digest[16]; /* message digest */<br /> MD5_CTX *context; /* context */<br /> {<br /> unsigned char bits[8];<br /> unsigned int index, padLen;<br /> /* Save number of bits */<br /> Encode (bits, context->count, 8);<br /> /* Pad out to 56 mod 64.*/<br /> index = (unsigned int)((context->count[0] >> 3) & 0x3f);<br /> padLen = (index < 56) ? (56 - index) : (120 - index);<br /> MD5Update (context, PADDING, padLen);<br /> /* Append length (before padding) */<br /> MD5Update (context, bits, 8);<br /> /* Store state in digest */<br /> Encode (digest, context->state, 16);<br /> /* Zeroize sensitive information.*/<br /> MD5_memset ((POINTER)context, 0, sizeof (*context));<br /> }<br /> /* MD5 basic transformation. Transforms state based on block. */<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];<br /> Decode (x, block, 64);<br /> /* 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 */<br /> /* 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 */<br /> 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 */<br /> /* 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 */<br /> /* 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 */<br /> state[0] += a;<br /> state[1] += b;<br /> state[2] += c;<br /> state[3] += d;<br /> /* Zeroize sensitive information. */<br /> MD5_memset ((POINTER)x, 0, sizeof (x));<br /> }<br /> /* Encodes input (UINT4) into output (unsigned char). Assumes len is<br /> a multiple of 4. */<br /> static void Encode (output, input, len)<br /> unsigned char *output;<br /> UINT4 *input;<br /> unsigned int len;<br /> {<br /> unsigned int i, j;<br /> 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 /> }<br /> /* Decodes input (unsigned char) into output (UINT4). Assumes len is<br /> a multiple of 4. */<br /> static void Decode (output, input, len)<br /> UINT4 *output;<br /> unsigned char *input;<br /> unsigned int len;<br /> {<br /> unsigned int i, j;<br /> 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 /> /* Note: Replace "for loop" with standard memcpy if possible. */<br /> static void MD5_memcpy (output, input, len)<br /> POINTER output;<br /> POINTER input;<br /> unsigned int len;<br /> {<br /> unsigned int i;<br /> for (i = 0; i < len; i++)<br /> output[i] = input[i];<br /> }<br /> /* Note: Replace "for loop" with standard memset if possible. */<br /> static void MD5_memset (output, value, len)<br /> POINTER output;<br /> int value;<br /> unsigned int len;<br /> {<br /> unsigned int i;<br /> for (i = 0; i < len; i++)<br /> ((char *)output)[i] = (char)value;<br /> }<br /> #include <stdio.h><br /> #include <string.h><br /> #include <stdlib.h><br /> /*#include "md5.h"*/<br /> char *MD5String (const char *string)<br /> {<br /> int i;<br /> MD5_CTX context;<br /> unsigned char digest[16];<br /> char *result=(char *)malloc(33);<br /> MD5Init (&context);<br /> MD5Update (&context, string, strlen(string));<br /> MD5Final (digest, &context);<br /> for (i=0; i<16; i++)<br /> sprintf(result+2*i, "%02x", digest[i]);<br /> result[32]=0;<br /> return result;<br /> }<br /> int main(int argc, char **argv)<br /> {<br /> if (argc != 2)<br /> {<br /> fprintf(stderr, "Usage: %s <string>/n", argv[0]);<br /> return 1;<br /> }<br /> printf("%s/n", MD5String(argv[1]));<br /> system("pause");<br /> return 0;<br /> }