今天在github上搜到了一个MD5的c++代码段，挺好用的，适合32位和64位的机器，在此感谢JieweiWei，该代码段在github的地址是：https://github.com/DamonHu/md5
GitOsc下载：http://git.oschina.net/DamonHoo/md5
MD5的C++用法
C++的头文件：
/**
* @file md5.h
* @The header file of md5.
* @author Jiewei Wei
* @mail weijieweijerry@163.com
* @github https://github.com/JieweiWei
* @data Oct 19 2014
*
*/
#ifndef MD5_H
#define MD5_H
/* Parameters of MD5. */
#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
/**
* @Basic MD5 functions.
*
* @param there bit32.
*
* @return one bit32.
*/
#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.
*
* @param {num} the raw number.
*
* @param {n} rotate left n.
*
* @return the number after rotated left.
*/
#define ROTATELEFT(num, n) (((num) << (n)) | ((num) >> (32-(n))))
/**
* @Transformations for rounds 1, 2, 3, and 4.
*/
#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + ac; \
(a) = ROTATELEFT ((a), (s)); \
(a) += (b); \
}
#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + ac; \
(a) = ROTATELEFT ((a), (s)); \
(a) += (b); \
}
#define HH(a, b, c, d, x, s, ac) { \
(a) += H ((b), (c), (d)) + (x) + ac; \
(a) = ROTATELEFT ((a), (s)); \
(a) += (b); \
}
#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + ac; \
(a) = ROTATELEFT ((a), (s)); \
(a) += (b); \
}
#include <string>
#include <cstring>
using std::string;
/* Define of btye.*/
typedef unsigned char byte;
/* Define of byte. */
typedef unsigned int bit32;
class MD5 {
public:
/* Construct a MD5 object with a string. */
MD5(const string& message);
/* Generate md5 digest. */
const byte* getDigest();
/* Convert digest to string value */
string toStr();
private:
/* Initialization the md5 object, processing another message block,
* and updating the context.*/
void init(const byte* input, size_t len);
/* MD5 basic transformation. Transforms state based on block. */
void transform(const byte block[64]);
/* Encodes input (usigned long) into output (byte). */
void encode(const bit32* input, byte* output, size_t length);
/* Decodes input (byte) into output (usigned long). */
void decode(const byte* input, bit32* output, size_t length);
private:
/* Flag for mark whether calculate finished. */
bool finished;
/* state (ABCD). */
bit32 state[4];
/* number of bits, low-order word first. */
bit32 count[2];
/* input buffer. */
byte buffer[64];
/* message digest. */
byte digest[16];
/* padding for calculate. */
static const byte PADDING[64];
/* Hex numbers. */
static const char HEX_NUMBERS[16];
};
#endif // MD5_HC++的cpp文件：
/**
* @file md5.cpp
* @The implement of md5.
* @author Jiewei Wei
* @mail weijieweijerry@163.com
* @github https://github.com/JieweiWei
* @data Oct 19 2014
*
*/
#include "md5.h"
/* Define the static member of MD5. */
const byte MD5::PADDING[64] = { 0x80 };
const char MD5::HEX_NUMBERS[16] = {
'0', '1', '2', '3',
'4', '5', '6', '7',
'8', '9', 'a', 'b',
'c', 'd', 'e', 'f'
};
/**
* @Construct a MD5 object with a string.
*
* @param {message} the message will be transformed.
*
*/
MD5::MD5(const string& message) {
finished = false;
/* Reset number of bits. */
count[0] = count[1] = 0;
/* Initialization constants. */
state[0] = 0x67452301;
state[1] = 0xefcdab89;
state[2] = 0x98badcfe;
state[3] = 0x10325476;
/* Initialization the object according to message. */
init((const byte*)message.c_str(), message.length());
}
/**
* @Generate md5 digest.
*
* @return the message-digest.
*
*/
const byte* MD5::getDigest() {
if (!finished) {
finished = true;
byte bits[8];
bit32 oldState[4];
bit32 oldCount[2];
bit32 index, padLen;
/* Save current state and count. */
memcpy(oldState, state, 16);
memcpy(oldCount, count, 8);
/* Save number of bits */
encode(count, bits, 8);
/* Pad out to 56 mod 64. */
index = (bit32)((count[0] >> 3) & 0x3f);
padLen = (index < 56) ? (56 - index) : (120 - index);
init(PADDING, padLen);
/* Append length (before padding) */
init(bits, 8);
/* Store state in digest */
encode(state, digest, 16);
/* Restore current state and count. */
memcpy(state, oldState, 16);
memcpy(count, oldCount, 8);
}
return digest;
}
/**
* @Initialization the md5 object, processing another message block,
* and updating the context.
*
* @param {input} the input message.
*
* @param {len} the number btye of message.
*
*/
void MD5::init(const byte* input, size_t len) {
bit32 i, index, partLen;
finished = false;
/* Compute number of bytes mod 64 */
index = (bit32)((count[0] >> 3) & 0x3f);
/* update number of bits */
if ((count[0] += ((bit32)len << 3)) < ((bit32)len << 3)) {
++count[1];
}
count[1] += ((bit32)len >> 29);
partLen = 64 - index;
/* transform as many times as possible. */
if (len >= partLen) {
memcpy(&buffer[index], input, partLen);
transform(buffer);
for (i = partLen; i + 63 < len; i += 64) {
transform(&input[i]);
}
index = 0;
} else {
i = 0;
}
/* Buffer remaining input */
memcpy(&buffer[index], &input[i], len - i);
}
/**
* @MD5 basic transformation. Transforms state based on block.
*
* @param {block} the message block.
*/
void MD5::transform(const byte block[64]) {
bit32 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
decode(block, x, 64);
/* Round 1 */
FF (a, b, c, d, x[ 0], s11, 0xd76aa478);
FF (d, a, b, c, x[ 1], s12, 0xe8c7b756);
FF (c, d, a, b, x[ 2], s13, 0x242070db);
FF (b, c, d, a, x[ 3], s14, 0xc1bdceee);
FF (a, b, c, d, x[ 4], s11, 0xf57c0faf);
FF (d, a, b, c, x[ 5], s12, 0x4787c62a);
FF (c, d, a, b, x[ 6], s13, 0xa8304613);
FF (b, c, d, a, x[ 7], s14, 0xfd469501);
FF (a, b, c, d, x[ 8], s11, 0x698098d8);
FF (d, a, b, c, x[ 9], s12, 0x8b44f7af);
FF (c, d, a, b, x[10], s13, 0xffff5bb1);
FF (b, c, d, a, x[11], s14, 0x895cd7be);
FF (a, b, c, d, x[12], s11, 0x6b901122);
FF (d, a, b, c, x[13], s12, 0xfd987193);
FF (c, d, a, b, x[14], s13, 0xa679438e);
FF (b, c, d, a, x[15], s14, 0x49b40821);
/* Round 2 */
GG (a, b, c, d, x[ 1], s21, 0xf61e2562);
GG (d, a, b, c, x[ 6], s22, 0xc040b340);
GG (c, d, a, b, x[11], s23, 0x265e5a51);
GG (b, c, d, a, x[ 0], s24, 0xe9b6c7aa);
GG (a, b, c, d, x[ 5], s21, 0xd62f105d);
GG (d, a, b, c, x[10], s22, 0x2441453);
GG (c, d, a, b, x[15], s23, 0xd8a1e681);
GG (b, c, d, a, x[ 4], s24, 0xe7d3fbc8);
GG (a, b, c, d, x[ 9], s21, 0x21e1cde6);
GG (d, a, b, c, x[14], s22, 0xc33707d6);
GG (c, d, a, b, x[ 3], s23, 0xf4d50d87);
GG (b, c, d, a, x[ 8], s24, 0x455a14ed);
GG (a, b, c, d, x[13], s21, 0xa9e3e905);
GG (d, a, b, c, x[ 2], s22, 0xfcefa3f8);
GG (c, d, a, b, x[ 7], s23, 0x676f02d9);
GG (b, c, d, a, x[12], s24, 0x8d2a4c8a);
/* Round 3 */
HH (a, b, c, d, x[ 5], s31, 0xfffa3942);
HH (d, a, b, c, x[ 8], s32, 0x8771f681);
HH (c, d, a, b, x[11], s33, 0x6d9d6122);
HH (b, c, d, a, x[14], s34, 0xfde5380c);
HH (a, b, c, d, x[ 1], s31, 0xa4beea44);
HH (d, a, b, c, x[ 4], s32, 0x4bdecfa9);
HH (c, d, a, b, x[ 7], s33, 0xf6bb4b60);
HH (b, c, d, a, x[10], s34, 0xbebfbc70);
HH (a, b, c, d, x[13], s31, 0x289b7ec6);
HH (d, a, b, c, x[ 0], s32, 0xeaa127fa);
HH (c, d, a, b, x[ 3], s33, 0xd4ef3085);
HH (b, c, d, a, x[ 6], s34, 0x4881d05);
HH (a, b, c, d, x[ 9], s31, 0xd9d4d039);
HH (d, a, b, c, x[12], s32, 0xe6db99e5);
HH (c, d, a, b, x[15], s33, 0x1fa27cf8);
HH (b, c, d, a, x[ 2], s34, 0xc4ac5665);
/* Round 4 */
II (a, b, c, d, x[ 0], s41, 0xf4292244);
II (d, a, b, c, x[ 7], s42, 0x432aff97);
II (c, d, a, b, x[14], s43, 0xab9423a7);
II (b, c, d, a, x[ 5], s44, 0xfc93a039);
II (a, b, c, d, x[12], s41, 0x655b59c3);
II (d, a, b, c, x[ 3], s42, 0x8f0ccc92);
II (c, d, a, b, x[10], s43, 0xffeff47d);
II (b, c, d, a, x[ 1], s44, 0x85845dd1);
II (a, b, c, d, x[ 8], s41, 0x6fa87e4f);
II (d, a, b, c, x[15], s42, 0xfe2ce6e0);
II (c, d, a, b, x[ 6], s43, 0xa3014314);
II (b, c, d, a, x[13], s44, 0x4e0811a1);
II (a, b, c, d, x[ 4], s41, 0xf7537e82);
II (d, a, b, c, x[11], s42, 0xbd3af235);
II (c, d, a, b, x[ 2], s43, 0x2ad7d2bb);
II (b, c, d, a, x[ 9], s44, 0xeb86d391);
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
}
/**
* @Encodes input (unsigned long) into output (byte).
*
* @param {input} usigned long.
*
* @param {output} byte.
*
* @param {length} the length of input.
*
*/
void MD5::encode(const bit32* input, byte* output, size_t length) {
for (size_t i = 0, j = 0; j < length; ++i, j += 4) {
output[j]= (byte)(input[i] & 0xff);
output[j + 1] = (byte)((input[i] >> 8) & 0xff);
output[j + 2] = (byte)((input[i] >> 16) & 0xff);
output[j + 3] = (byte)((input[i] >> 24) & 0xff);
}
}
/**
* @Decodes input (byte) into output (usigned long).
*
* @param {input} bytes.
*
* @param {output} unsigned long.
*
* @param {length} the length of input.
*
*/
void MD5::decode(const byte* input, bit32* output, size_t length) {
for (size_t i = 0, j = 0; j < length; ++i, j += 4) {
output[i] = ((bit32)input[j]) | (((bit32)input[j + 1]) << 8) |
(((bit32)input[j + 2]) << 16) | (((bit32)input[j + 3]) << 24);
}
}
/**
* @Convert digest to string value.
*
* @return the hex string of digest.
*
*/
string MD5::toStr() {
const byte* digest_ = getDigest();
string str;
str.reserve(16 << 1);
for (size_t i = 0; i < 16; ++i) {
int t = digest_[i];
int a = t / 16;
int b = t % 16;
str.append(1, HEX_NUMBERS[a]);
str.append(1, HEX_NUMBERS[b]);
}
return str;
}C++的使用实例：
/**
* @file test.cpp
* @The test file of md5.
* @author Jiewei Wei
* @mail weijieweijerry@163.com
* @github https://github.com/JieweiWei
* @data Oct 19 2014
*
*/
#include <iostream>
#include "md5.h"
using std::cout;
using std::endl;
void printMD5(const string& message) {
cout << "md5(\"" << message << "\") = "
<< MD5(message).toStr() << endl;
}
int main() {
printMD5("");
printMD5("a");
printMD5("abc");
printMD5("message digest");
printMD5("abcdefghijklmnopqrstuvwxyz");
printMD5("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz");
return 0;
}MD5的OC用法
查看这个文章：Objective-C MD5加密字符串
MD5的另外一种C++用法但是只适用于32位
查看这个文章：MD5填坑备忘
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