md5加密算法C++程序

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#include "global.h"
8 W" s/ a7 r: p c+ e v#include "md5.h"
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" `, y' V4 E' H$ G; Q/ p9 q6 L" z2 M/* Constants for MD5Transform routine.
*/


( t$ k" e u+ E* e' Z#define S11 7
#define S12 12
2 Y$ g B5 {8 c9 Q& }#define S13 17
#define S14 22
. j& R% c: x, e- h4 h1 A1 L, ?#define S21 5
/ \! u6 _8 e( |2 N2 m8 T#define S22 9
#define S23 14
#define S24 20
v/ P. i+ _3 I8 p#define S31 4
#define S32 11
* [& y8 X5 v5 G8 V* f3 r. G#define S33 16
; `9 \ Q9 i+ b7 R f( n- `#define S34 23
( D' A8 g/ E3 R& D1 B#define S41 6
" C* J5 X( l* S5 r#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));
; {7 Y8 i0 N' B7 `! W; vstatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
! j; [9 O+ Z" `' i, gstatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
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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.
*/
9 {& y( ~# l" L+ ^" _$ Y* I1 w#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))
0 t& A2 L- l* W( ]#define I(x, y, z) ((y) ^ ((x) | (~z)))

/* ROTATE_LEFT rotates x left n bits.
*/
2 j2 M6 D. ]. p! d#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

' ^% I8 d- T2 S' ^/* 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); \
}
/ H) {. B/ l6 F#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
; T1 E& t8 ?/ r4 s7 n; h- Q. {#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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t- j2 s! x% b, z- y" O8 \% V; t/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
! D: I8 ^- x+ b6 P9 p) @void MD5Init (context)
& v9 G1 ~6 Q O8 V4 G ]MD5_CTX *context; /* context */
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context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
; @" Q5 D* n% R4 N, d$ n) p*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
! I F( a2 M9 r5 Z# _5 o2 {& a}

/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
. j9 R9 y# h2 m* Fvoid MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
{
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))
&

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