md5加密算法C++程序

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#include "global.h"
) `$ V, x5 S* m7 d1 i#include "md5.h"

: l6 E# ^1 e: ^/* Constants for MD5Transform routine.
*/
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1 |. |* H3 _. u. X#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
4 n! |8 k# l4 \$ ~5 O#define S23 14
: r. s4 b( g9 p+ v) f7 t#define S24 20
#define S31 4
) R% T4 R1 r5 ~#define S32 11
8 v y) J) y& S* p: Z#define S33 16
#define S34 23
#define S41 6
* G7 K7 f, x. T: }2 X W#define S42 10
8 d+ V7 X3 [* Y. B* Y# a#define S43 15
#define S44 21

, O8 O" Q3 K2 l! _. Z: Rstatic 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));
* R1 G' v9 x" h; Fstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
8 v' p& y( u: Y3 }6 C* l* Dstatic 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
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/ q5 v5 S; |1 k/* F, G, H and I are basic MD5 functions.
*/
# ^/ P* d9 E& a- \#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))
$ `2 b. \$ j6 N& m. f5 L6 W+ x#define I(x, y, z) ((y) ^ ((x) | (~z)))
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4 K8 |# w, K* Z- Y! p/* ROTATE_LEFT rotates x left n bits.
*/
) j u2 a& a6 M* D, ^# I! W#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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3 h" G0 v/ m* i$ c* v0 X/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
+ f) z- K1 u) Q2 Q# HRotation 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); \
}
9 \; X8 R! d6 B" T#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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* s7 f* i) m7 v+ C/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
MD5_CTX *context; /* context */
{
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;
}

/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
+ p* k. V) X& S1 q/ |, Qvoid MD5Update (context, input, inputLen)
' ~( l( b9 d/ }+ \% C5 m. BMD5_CTX *context; /* context */
! N( h% }& s, n! e* runsigned 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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