md5加密算法C++程序

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#include "global.h"
#include "md5.h"
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/* Constants for MD5Transform routine.
*/
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- v8 b: B1 c0 H#define S11 7
# {: l% S8 `6 w2 ^0 o1 W#define S12 12
5 G& L2 K5 s" O# z#define S13 17
5 q3 e: s! G% y# o: T0 K#define S14 22
7 ]8 n: l7 r$ V" s ~- m#define S21 5
#define S22 9
#define S23 14
#define S24 20
1 }* m( l5 x) Y: w+ \: ~#define S31 4
6 I6 }7 s6 t/ D a3 a#define S32 11
( J. D) o* R8 Z8 a* |0 O' e: P#define S33 16
2 A1 V2 p E6 T* Z#define S34 23
* W3 h& ]; J( ?#define S41 6
#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));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
* ?& g# H4 f5 b+ istatic 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
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/* 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)))
# b. y. r- N5 n' s3 [; x#define H(x, y, z) ((x) ^ (y) ^ (z))
" _7 P, _4 H* z& W2 A#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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X2 w" T/ p! y2 y/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Rotation is separate from addition to prevent recomputation.
*/
( U) }7 m7 p4 \0 E; d#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); \
}
( ?$ ]. K7 Z- o. x3 i* 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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/* 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;
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2 `$ n1 z$ E5 F' S. W! u/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
& g8 N b2 Y% ]( w+ y/ }MD5_CTX *context; /* context */
unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
# l) D9 c1 A3 n1 e{
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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