MD5 源码(一次自私的发帖, 还有帖子里的代码非本人原创,请作者看到后跟下贴,那大伙儿都知道)

[hongzao]

#ifndef MD5_H
#define MD5_H

#include <string>
#include <fstream>

/* Type define */
typedef unsigned char Byte;
typedef unsigned int UInt32;
typedef size_t SizeType;

using std::string;
using std::ifstream;

/* MD5 declaration. */
class MD5 {
public:
	MD5();
	MD5(const void* input, SizeType length);
	MD5(const string& str);
	MD5(ifstream& in);
	void update(const void* input, SizeType length);
	void update(const string& str);
	void update(ifstream& in);
	const Byte* digest();
	string toString();
	void reset();

private:
	void update(const Byte* input, SizeType length);
	void final();
	void transform(const Byte block[64]);
	void encode(const UInt32* input, Byte* output, SizeType length);
	void decode(const Byte* input, UInt32* output, SizeType length);
	string bytesToHexString(const Byte* input, SizeType length);

	/* class uncopyable */
	MD5(const MD5&);
	MD5& operator=(const MD5&);

private:
	UInt32 state_[4];	/* state (ABCD) */
	UInt32 count_[2];	/* number of bits, modulo 2^64 (low-order word first) */
	Byte buffer_[64];	/* input buffer */
	Byte digest_[16];	/* message digest */
	bool isFinished_;		/* calculate finished ? */

	static const Byte Padding[64];	/* padding for calculate */
	static const char Hex[16];
	static const int BufferSize = 1024;
};

#endif /*MD5_H*/

[hongzao]

#include "md5.h"

using namespace std;

/* Constants for MD5Transform routine. */
const int S[4][4] = {
	7, 12, 17, 22,
	5, 9, 14, 20,
	4, 11, 16, 23,
	6, 10, 15, 21
};

/* F, G, H and I are basic MD5 functions.
*/
inline UInt32 F(UInt32 x, UInt32 y, UInt32 z)
{
	return (x & y) | ((~x) & z);
}

inline UInt32 G(UInt32 x, UInt32 y, UInt32 z)
{
	return (x & z) | (y & (~z));
}

inline UInt32 H(UInt32 x, UInt32 y, UInt32 z)
{
	return x ^ y ^ z;
}

inline UInt32 I(UInt32 x, UInt32 y, UInt32 z)
{
	return y ^ (x | (~z));
}

/* ROTATE_LEFT rotates x left n bits.
*/
inline UInt32 RotateLeft(UInt32 x, int n)
{
	return (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.
*/
inline void FF(UInt32& a, UInt32 b, UInt32 c, UInt32 d, UInt32 x, int s, UInt32 ac)
{
	a += F(b, c, d) + x + ac;
	a = RotateLeft(a, s);
	a += b;
}

inline void GG(UInt32& a, UInt32 b, UInt32 c, UInt32 d, UInt32 x, int s, UInt32 ac)
{
	a += G(b, c, d) + x + ac;
	a = RotateLeft(a, s);
	a += b;
}

inline void HH(UInt32& a, UInt32 b, UInt32 c, UInt32 d, UInt32 x, int s, UInt32 ac)
{
	a += H(b, c, d) + x + ac;
	a = RotateLeft(a, s);
	a += b;
}

inline void II(UInt32& a, UInt32 b, UInt32 c, UInt32 d, UInt32 x, int s, UInt32 ac)
{
	a += I(b, c, d) + x + ac;
	a = RotateLeft(a, s);
	a += b;
}

const Byte MD5::Padding[64] = { 0x80 };
const char MD5::Hex[16] = {
	'0', '1', '2', '3',
	'4', '5', '6', '7',
	'8', '9', 'a', 'b',
	'c', 'd', 'e', 'f'
};

[hongzao]

/* Default construct. */
MD5::MD5() {
	reset();
}

/* Construct a MD5 object with a input buffer. */
MD5::MD5(const void* input, SizeType length) {
	reset();
	update(input, length);
}

/* Construct a MD5 object with a string. */
MD5::MD5(const string& str) {
	reset();
	update(str);
}

/* Construct a MD5 object with a file. */
MD5::MD5(ifstream& in) {
	reset();
	update(in);
}

/* Return the message-digest */
const Byte* MD5::digest() {

	if (!isFinished_) {
		isFinished_ = true;
		final();
	}
	return digest_;
}

/* Reset the calculate state */
void MD5::reset() {

	isFinished_ = false;
	/* reset number of bits. */
	count_[0] = count_[1] = 0;
	/* Load magic initialization constants. */
	state_[0] = 0x67452301;
	state_[1] = 0xefcdab89;
	state_[2] = 0x98badcfe;
	state_[3] = 0x10325476;
}

/* Updating the context with a input buffer. */
void MD5::update(const void* input, SizeType length) {
	update((const Byte*)input, length);
}

/* Updating the context with a string. */
void MD5::update(const string& str) {
	update((const Byte*)str.c_str(), str.length());
}

/* Updating the context with a file. */
void MD5::update(ifstream& in) {

	if (!in) {
		return;
	}

	std::streamsize length;
	char buffer[BufferSize];
	while (!in.eof()) {
		in.read(buffer, BufferSize);
		length = in.gcount();
		if (length > 0) {
			update(buffer, length);
		}
	}
	in.close();
}

/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5::update(const Byte* input, SizeType length) {

	UInt32 i, index, partLen;

	isFinished_ = false;

	/* Compute number of bytes mod 64 */
	index = (UInt32)((count_[0] >> 3) & 0x3f);

	/* update number of bits */
	if ((count_[0] += ((UInt32)length << 3)) < ((UInt32)length << 3)) {
		++count_[1];
	}
	count_[1] += ((UInt32)length >> 29);

	partLen = 64 - index;

	/* transform as many times as possible. */
	if (length >= partLen) {

		memcpy(&buffer_[index], input, partLen);
		transform(buffer_);

		for (i = partLen; i + 63 < length; i += 64) {
			transform(&input[i]);
		}
		index = 0;

	} else {
		i = 0;
	}

	/* Buffer remaining input */
	memcpy(&buffer_[index], &input[i], length - i);
}

/* MD5 finalization. Ends an MD5 message-digest_ operation, writing the
the message digest_ and zeroizing the context.
*/
void MD5::final() {

	Byte bits[8];
	UInt32 oldState[4];
	UInt32 oldCount[2];
	UInt32 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 = (UInt32)((count_[0] >> 3) & 0x3f);
	padLen = (index < 56) ? (56 - index) : (120 - index);
	update(Padding, padLen);

	/* Append length (before padding) */
	update(bits, 8);

	/* Store state in digest */
	encode(state_, digest_, 16);

	/* Restore current state and count. */
	memcpy(state_, oldState, 16);
	memcpy(count_, oldCount, 8);
}

[hongzao]

/* MD5 basic transformation. Transforms state_ based on block. */
void MD5::transform(const Byte block[64]) {

	UInt32 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], S[0][0], 0xd76aa478); /* 1 */
	FF (d, a, b, c, x[ 1], S[0][1], 0xe8c7b756); /* 2 */
	FF (c, d, a, b, x[ 2], S[0][2], 0x242070db); /* 3 */
	FF (b, c, d, a, x[ 3], S[0][3], 0xc1bdceee); /* 4 */
	FF (a, b, c, d, x[ 4], S[0][0], 0xf57c0faf); /* 5 */
	FF (d, a, b, c, x[ 5], S[0][1], 0x4787c62a); /* 6 */
	FF (c, d, a, b, x[ 6], S[0][2], 0xa8304613); /* 7 */
	FF (b, c, d, a, x[ 7], S[0][3], 0xfd469501); /* 8 */
	FF (a, b, c, d, x[ 8], S[0][0], 0x698098d8); /* 9 */
	FF (d, a, b, c, x[ 9], S[0][1], 0x8b44f7af); /* 10 */
	FF (c, d, a, b, x[10], S[0][2], 0xffff5bb1); /* 11 */
	FF (b, c, d, a, x[11], S[0][3], 0x895cd7be); /* 12 */
	FF (a, b, c, d, x[12], S[0][0], 0x6b901122); /* 13 */
	FF (d, a, b, c, x[13], S[0][1], 0xfd987193); /* 14 */
	FF (c, d, a, b, x[14], S[0][2], 0xa679438e); /* 15 */
	FF (b, c, d, a, x[15], S[0][3], 0x49b40821); /* 16 */

	/* Round 2 */
	GG (a, b, c, d, x[ 1], S[1][0], 0xf61e2562); /* 17 */
	GG (d, a, b, c, x[ 6], S[1][1], 0xc040b340); /* 18 */
	GG (c, d, a, b, x[11], S[1][2], 0x265e5a51); /* 19 */
	GG (b, c, d, a, x[ 0], S[1][3], 0xe9b6c7aa); /* 20 */
	GG (a, b, c, d, x[ 5], S[1][0], 0xd62f105d); /* 21 */
	GG (d, a, b, c, x[10], S[1][1],  0x2441453); /* 22 */
	GG (c, d, a, b, x[15], S[1][2], 0xd8a1e681); /* 23 */
	GG (b, c, d, a, x[ 4], S[1][3], 0xe7d3fbc8); /* 24 */
	GG (a, b, c, d, x[ 9], S[1][0], 0x21e1cde6); /* 25 */
	GG (d, a, b, c, x[14], S[1][1], 0xc33707d6); /* 26 */
	GG (c, d, a, b, x[ 3], S[1][2], 0xf4d50d87); /* 27 */
	GG (b, c, d, a, x[ 8], S[1][3], 0x455a14ed); /* 28 */
	GG (a, b, c, d, x[13], S[1][0], 0xa9e3e905); /* 29 */
	GG (d, a, b, c, x[ 2], S[1][1], 0xfcefa3f8); /* 30 */
	GG (c, d, a, b, x[ 7], S[1][2], 0x676f02d9); /* 31 */
	GG (b, c, d, a, x[12], S[1][3], 0x8d2a4c8a); /* 32 */

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

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

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

/* Encodes input (ulong) into output (Byte). Assumes length is
a multiple of 4.
*/
void MD5::encode(const UInt32* input, Byte* output, SizeType length) {

	for (SizeType 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 (ulong). Assumes length is
a multiple of 4.
*/
void MD5::decode(const Byte* input, UInt32* output, SizeType length) {

	for (SizeType i = 0, j = 0; j < length; ++i, j += 4) {
		output[i] = ((UInt32)input[j]) | (((UInt32)input[j + 1]) << 8) |
		(((UInt32)input[j + 2]) << 16) | (((UInt32)input[j + 3]) << 24);
	}
}

/* Convert Byte array to hex string. */
string MD5::bytesToHexString(const Byte* input, SizeType length) {

	string str;
	str.reserve(length << 1);
	for (SizeType i = 0; i < length; ++i) {
		int t = input[i];
		int a = t / 16;
		int b = t % 16;
		str.append(1, Hex[a]);
		str.append(1, Hex[b]);
	}
	return str;
}

/* Convert digest to string value */
string MD5::toString() {
	return bytesToHexString(digest(), 16);
}

[yefei679]

LZ这是做什么？

[hongzao]

现在在家找到的一个源码,准备到公司用,但公司是不能上博客和下东西,所以只好放到这里来了

[hongzao]

#include "md5.h"
#include <iostream>

using namespace std;

void PrintMD5(const string& str, MD5& md5) {
	cout << "MD5(\"" << str << "\") = " << md5.toString() << endl;
}

string FileDigest(const string& file) {

	ifstream in(file.c_str(), ios::binary);
	if (!in) {
		return "";
	}

	MD5 md5;
	std::streamsize length;
	char buffer[1024];
	while (!in.eof()) {
		in.read(buffer, 1024);
		length = in.gcount();
		if (length > 0) {
			md5.update(buffer, length);
		}
	}
	in.close();
	return md5.toString();
}

int main() {

	//cout << MD5("abc").toString() << endl;
	//cout << MD5(ifstream("D:\\test.txt")).toString() << endl;
	//cout << MD5(ifstream("D:\\test.exe", ios::binary)).toString() << endl;
	//cout << FileDigest("D:\\test.exe") << endl;

	MD5 md5;
	md5.update("");
	PrintMD5("", md5);

	md5.update("a");
	PrintMD5("a", md5);

	md5.update("bc");
	PrintMD5("abc", md5);

	md5.update("defghijklmnopqrstuvwxyz");
	PrintMD5("abcdefghijklmnopqrstuvwxyz", md5);

	md5.reset();
	md5.update("message digest");
	PrintMD5("message digest", md5);
	
	md5.reset();
	md5.update("sdfasdfadfasdfasdf");
	PrintMD5("sdfasdfadfasdfasdf", md5);

	//md5.reset();
	//md5.update(ifstream("D:\\test.txt"));
	//PrintMD5("D:\\test.txt", md5);
	return 0;
}

"" = d41d8cd98f00b204e9800998ecf8427e
"a" = 0cc175b9c0f1b6a831c399e269772661
"abc" = 900150983cd24fb0d6963f7d28e17f72
"abcdefghijklmnopqrstuvwxyz" = c3fcd3d76192e4007dfb496cca67e13b
"message digest" = f96b697d7cb7938d525a2f31aaf161d0
"sdfasdfadfasdfasdf" = 6dc48f52b4d534a46923d4d354937433

[eatsweetpotato]

mark