C++命名空间实现MD5加密

转自：http://blog.csdn.net/feier7501/article/details/10474473

采用namespace。

VS2010新建控制台空项目，加入下面的代码：

global.h：

/* GLOBAL.H - RSAREF types and constants /* Copyright (C) RSA Laboratories, a division of RSA Data Security, Inc., created 1991. All rights reserved. */#ifndef _GLOBAL_H_#define _GLOBAL_H_ 1namespace md5_global{/* PROTOTYPES should be set to one if and only if the compiler supports function argument prototyping. The following makes PROTOTYPES default to 1 if it has not already been defined as 0 with C compiler flags. */#ifndef PROTOTYPES#define PROTOTYPES 1#endif/* POINTER defines a generic pointer type */typedef unsigned char *POINTER;/* UINT2 defines a two byte word */typedef unsigned short int UINT2;/* UINT4 defines a four byte word */typedef unsigned long int UINT4;#ifndef NULL_PTR#define NULL_PTR ((POINTER)0)#endif#ifndef UNUSED_ARG#define UNUSED_ARG(x) x = *(&x);#endif/* PROTO_LIST is defined depending on how PROTOTYPES is defined above. If using PROTOTYPES, then PROTO_LIST returns the list, otherwise it returns an empty list. */#if PROTOTYPES#define PROTO_LIST(list) list#else#define PROTO_LIST(list) ()#endif}#endif /* end _GLOBAL_H_ */

md5.h：

/* MD5.H - header file for MD5C.C *//* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All rights reserved. License to copy and use this software is granted provided that it is identified as the "RSA Data Security, Inc. MD5 Message-Digest Algorithm" in all material mentioning or referencing this software or this function. License is also granted to make and use derivative works provided that such works are identified as "derived from the RSA Data Security, Inc. MD5 Message-Digest Algorithm" in all material mentioning or referencing the derived work. RSA Data Security, Inc. makes no representations concerning either the merchantability of this software or the suitability of this software for any particular purpose. It is provided "as is" without express or implied warranty of any kind. These notices must be retained in any copies of any part of this documentation and/or software. */#ifndef _MD5_H_#define _MD5_H_ 1#ifdef __cplusplusextern "C" {#endif#include "global.h"using namespace md5_global;namespace md5{/* MD5 context. */typedef struct {UINT4 state[4]; /* state (ABCD) */UINT4 count[2]; /* number of bits, modulo 2^64 (lsb first) */unsigned char buffer[64]; /* input buffer */}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 *));void MD5Print(unsigned char *output);void MD5(unsigned char *output, char *input);}#ifdef __cplusplus}#endif#endif

md5c.cpp：

/* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm *//* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All rights reserved. License to copy and use this software is granted provided that it is identified as the "RSA Data Security, Inc. MD5 Message-Digest Algorithm" in all material mentioning or referencing this software or this function. License is also granted to make and use derivative works provided that such works are identified as "derived from the RSA Data Security, Inc. MD5 Message-Digest Algorithm" in all material mentioning or referencing the derived work. RSA Data Security, Inc. makes no representations concerning either the merchantability of this software or the suitability of this software for any particular purpose. It is provided "as is" without express or implied warranty of any kind. These notices must be retained in any copies of any part of this documentation and/or software. */#include "global.h"#include "md5.h"#include <stdio.h>#include <string.h>using namespace md5_global;namespace md5{/* 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 21static 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 are basic MD5 functions. */#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 rotates x left n bits. */#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. Rotation is separate from addition to prevent recomputation. */#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 initialization. Begins an MD5 operation, writing a new context. */void MD5Init (MD5_CTX *context) /* context */{context->count[0] = context->count[1] = 0;/* Load magic initialization constants. */context->state[0] = 0x67452301;context->state[1] = 0xefcdab89;context->state[2] = 0x98badcfe;context->state[3] = 0x10325476;}/* MD5 block update operation. Continues an MD5 message-digest operation, processing another message block, and updating the context. */void MD5Update (MD5_CTX *context, unsigned char *input, unsigned int inputLen){unsigned int i, index, partLen;/* Compute number of bytes mod 64 */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;/* Transform as many times as possible. */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;}elsei = 0;/* Buffer remaining input */MD5_memcpy((POINTER)&context->buffer[index], (POINTER)&input[i],inputLen-i);}/* MD5 finalization. Ends an MD5 message-digest operation, writing the the message digest and zeroizing the context. */void MD5Final (unsigned char digest[16], MD5_CTX *context){unsigned char bits[8];unsigned int index, padLen;/* Save number of bits */Encode (bits, context->count, 8);/* Pad out to 56 mod 64. */index = (unsigned int)((context->count[0] >> 3) & 0x3f);padLen = (index < 56) ? (56 - index) : (120 - index);md5::MD5Update (context, (unsigned char*)PADDING, padLen);/* Append length (before padding) */md5::MD5Update (context, (unsigned char*)bits, 8);/* Store state in digest */Encode (digest, context->state, 16);/* Zeroize sensitive information. */MD5_memset ((POINTER)context, 0, sizeof (*context));}/* MD5 basic transformation. Transforms state based on block. */static void MD5Transform (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;/* Zeroize sensitive information. */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);}}/* Decodes input (unsigned char) into output (UINT4). Assumes len is a multiple of 4. */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);}/* Note: Replace "for loop" with standard memcpy if possible. */static void MD5_memcpy (POINTER output, POINTER input, unsigned int len){unsigned int i;for (i = 0; i < len; i++)output[i] = input[i];}/* Note: Replace "for loop" with standard memset if possible. */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;}void MD5Print(unsigned char *output) {int i;for (i = 0; i < 16; i++)printf("%02x", *(output + i));printf("\n");}void MD5(unsigned char *output, char *input) {md5::MD5_CTX md5;md5::MD5Init(&md5);md5::MD5Update(&md5, (unsigned char*) input, strlen(input));md5::MD5Final(output, &md5);}}

测试main.cpp：

#include <stdio.h>#include <string.h>#include "md5.h"int main(){unsigned char szMD5[16]={0};md5::MD5(szMD5, "");md5::MD5Print(szMD5);md5::MD5(szMD5, "a");md5::MD5Print(szMD5);md5::MD5(szMD5, "abc");md5::MD5Print(szMD5);md5::MD5(szMD5, "message digest");md5::MD5Print(szMD5);md5::MD5(szMD5, "abcdefghijklmnopqrstuvwxyz");md5::MD5Print(szMD5);md5::MD5(szMD5, "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789");md5::MD5Print(szMD5);md5::MD5(szMD5, "12345678901234567890123456789012345678901234567890123456789012345678901234567890");md5::MD5Print(szMD5);return 0;}

不错的MD5加密实现，可以直接用~