md5加密算法C++程序

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#include "global.h"
#include "md5.h"

* x" a1 k! U6 B8 l( c6 z% W5 L/* Constants for MD5Transform routine.
*/


7 \, `9 q% O7 s) r/ o#define S11 7
, y% ^% z4 ~5 {# `#define S12 12
" u l; p1 ]# b. z#define S13 17
; F* y6 e: R0 e* G2 l#define S14 22
#define S21 5
4 g, l' {* _9 s; u" n3 g! ]#define S22 9
#define S23 14
% w& l2 z$ T/ k. y. M" P#define S24 20
#define S31 4
#define S32 11
5 w4 i; l" K, ], I, J8 J. T! y#define S33 16
#define S34 23
#define S41 6
" O$ z; I# [ C$ t#define S42 10
' h- {% e* M% ^* { W2 L: `3 ]#define S43 15
#define S44 21
q' |% @7 a8 E& @" l: t) q
static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
' w( ]( C9 s0 d/ q7 wstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

5 Q7 C4 ]( C; kstatic 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
) ?/ |- _, M$ v; R7 r& b% g0 Z};

/* 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))
0 k7 U1 ~ ]9 W9 ]6 b. v- K#define I(x, y, z) ((y) ^ ((x) | (~z)))

n+ U: U4 k8 s/* 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.
$ ?$ i$ A% |1 B$ G3 B& j5 nRotation 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); \
}
+ d4 }6 i. m# O/ P& s#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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4 A+ O# {: a6 C$ v3 S/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
/ a( K8 F. ~6 a, xvoid MD5Init (context)
# T1 c* R; ~2 D8 D0 D* [MD5_CTX *context; /* context */
{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
4 a6 ~ W7 _9 G; d1 e6 p*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}

, `" U+ n5 Y) n5 H/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
7 p, W* T' t/ A; s; F3 Fvoid MD5Update (context, input, inputLen)
( k2 M) i' ]4 b" Z, o9 n1 ^* a3 }MD5_CTX *context; /* context */
, X9 G5 L) Y+ G& g. junsigned char *input; /* input block */
, u3 g: h4 n' `: hunsigned int inputLen; /* length of input block */
$ Q5 d, ^: ^1 v0 s{
unsigned int i, index, partLen;
' v X& s: B w) D& }) Z" @ L
/* 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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