md5加密算法C++程序

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#include "global.h"
& ?! i/ I& a; h- D( j' E) Y" W0 ^+ \$ j#include "md5.h"

/* Constants for MD5Transform routine.
*/
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#define S11 7
2 E) n8 ^" E5 [0 h#define S12 12
#define S13 17
- W7 l( d: x0 G7 H k& r#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
- w s5 m) U) n' s#define S33 16
$ E' f2 }, ]/ h4 ~& J; T0 F- Q, ]#define S34 23
2 x* P: A6 d1 Z# k1 O6 U) n4 l. y#define S41 6
#define S42 10
#define S43 15
#define S44 21
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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));
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
9 a5 C5 c9 {3 K4 f- tstatic 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
};

# y& s, j5 p2 I" H; k7 h/* 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)))
% l' B$ P o4 \! s2 }#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))
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3 ^0 a) T' T- T+ h, L/* ROTATE_LEFT rotates x left n bits.
*/
2 `8 b0 C% u- S* b+ @1 k& N; e#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.
*/
3 X% N* I0 Q! x& n# N) O; y#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
( ~* c; j% T4 @, V H% g! R5 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); \
}
' A- T h" f: p/ N#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); \
}

, f9 ~2 e1 p# H; ]/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
) u. }" f+ d8 `/ ~4 I( rMD5_CTX *context; /* context */
2 a% A2 l$ u3 A: U{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
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context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
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$ p# t$ u Z7 j/ q( o' q$ x/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
) C. u6 t) \$ H# ]5 MMD5_CTX *context; /* context */
9 R u: }0 R" a$ N7 z7 P9 uunsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
{
unsigned int i, index, partLen;
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/* 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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