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MD5的C++源码
关于MD5的C源码,请参考另外一篇文章:
MD5的C源码 http://www.linuxidc.com/Linux/2011-12/49783.htm
md5.h:
#ifndef MD5_H
#define MD5_H
#include <string>
#include <fstream>
/* Type define */
typedef
unsigned
char
byte;
typedef
unsigned
int
uint32;
using
std::string;
using
std::ifstream;
/* MD5 declaration. */
class
MD5 {
public
:
MD5();
MD5(
const
void
*input,
size_t
length);
MD5(
const
string &str);
MD5(ifstream &in);
void
update(
const
void
*input,
size_t
length);
void
update(
const
string &str);
void
update(ifstream &in);
const
byte* digest();
string toString();
void
reset();
private
:
void
update(
const
byte *input,
size_t
length);
void
final();
void
transform(
const
byte block[64]);
void
encode(
const
uint32 *input, byte *output,
size_t
length);
void
decode(
const
byte *input, uint32 *output,
size_t
length);
string bytesToHexString(
const
byte *input,
size_t
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
_finished;
/* calculate finished ? */
static
const
byte PADDING[64];
/* padding for calculate */
static
const
char
HEX[16];
static
const
size_t
BUFFER_SIZE = 1024;
};
#endif/*MD5_H*/
md5.cpp:
#include "md5.h"
using
namespace
std;
/* 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 21
/* 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) + ac;
(a) = ROTATE_LEFT ((a), (s));
(a) += (b);
}
#define GG(a, b, c, d, x, s, ac) {
(a) += G ((b), (c), (d)) + (x) + ac;
(a) = ROTATE_LEFT ((a), (s));
(a) += (b);
}
#define HH(a, b, c, d, x, s, ac) {
(a) += H ((b), (c), (d)) + (x) + ac;
(a) = ROTATE_LEFT ((a), (s));
(a) += (b);
}
#define II(a, b, c, d, x, s, ac) {
(a) += I ((b), (c), (d)) + (x) + ac;
(a) = ROTATE_LEFT ((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"
};
/* Default construct. */
MD5::MD5() {
reset();
}
/* Construct a MD5 object with a input buffer. */
MD5::MD5(
const
void
*input,
size_t
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
(!_finished) {
_finished =
true
;
final();
}
return
_digest;
}
/* Reset the calculate state */
void
MD5::reset() {
_finished =
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,
size_t
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[BUFFER_SIZE];
while
(!in.eof()) {
in.read(buffer, BUFFER_SIZE);
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,
size_t
length) {
uint32 i, index, partLen;
_finished =
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);
}
/* 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], 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;
}
/* Encodes input (ulong) into output (byte). Assumes length is
a multiple of 4.
*/
void
MD5::encode(
const
uint32 *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 (ulong). Assumes length is
a multiple of 4.
*/
void
MD5::decode(
const
byte *input, uint32 *output,
size_t
length) {
for
(
size_t
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,
size_t
length) {
string str;
str.reserve(length << 1);
for
(
size_t
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);
}
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