md5加密算法C++程序

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#include "global.h"
#include "md5.h"
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1 F- N0 ?9 t' o5 j- h& `) W% J8 h9 m/* Constants for MD5Transform routine.
*/
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# Y0 D9 S5 G9 ` {3 L7 x2 n#define S11 7
7 q, f' q* @# ^$ N#define S12 12
; @ W* L- D5 k2 [* T1 H#define S13 17
; Y$ `2 {9 {/ s) q0 e#define S14 22
#define S21 5
B% k$ q7 h( }3 a#define S22 9
2 S) Z' \- q# \' y. m#define S23 14
#define S24 20
! j' a* Y, E& [, j! r#define S31 4
#define S32 11
#define S33 16
#define S34 23
& Z3 D F6 T" ~6 t' n#define S41 6
* [+ r: W: _. s; Y- P& C#define S42 10
#define S43 15
#define S44 21

static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
0 Z7 |% g/ ~' B% [6 D a( bstatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
7 E0 j9 U8 Q! ^: h* U1 |# D0 pstatic 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
2 M- K4 `1 N. h; x# K9 t};

( z" _6 X. d) X* B/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
- G! e+ v- Z: ~( Q* l#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
2 V1 ^! S* g& [5 G3 f#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))))
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/ J" {4 a9 W% e2 G0 r# R/* 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); \
}
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. J8 W0 |& V% N: s; i/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
MD5_CTX *context; /* context */
; f+ ?! p- D2 a b; w{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
, Q( u9 Q7 f2 g/ S0 ?& y*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
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/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
3 O+ F3 m( _; L6 i+ a& K% k/ ^void MD5Update (context, input, inputLen)
7 O$ a0 o. j/ T; NMD5_CTX *context; /* context */
unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
! f( O4 [2 N* l @% K6 p{
unsigned int i, index, partLen;
0 i& B9 m2 l% B& f3 F3 W+ N& |; \
/* Compute number of bytes mod 64 */
index = (unsigned int)((context->count[0] >> 3) & 0x3F);
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/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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