md5加密算法C++程序

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

/* Constants for MD5Transform routine.
*/

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#define S11 7
#define S12 12
8 \6 ]( f) r4 l1 U+ s#define S13 17
- s+ x; y+ q7 E+ {3 s( G/ r( z#define S14 22
#define S21 5
8 F' U7 u' Z6 I) Q#define S22 9
" { g# r3 w \' ^#define S23 14
) Y/ N7 I$ X5 ~& L& D/ B0 Y#define S24 20
: \$ l3 \ D$ G* }& j& r#define S31 4
+ c' ^% y4 ]' r; B& S- p7 C! U" I#define S32 11
#define S33 16
#define S34 23
9 U- B( W9 O; v/ c#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]));
/ L- _! c& l* ~; wstatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
4 r, p& [6 Z {2 j$ M5 m2 Ustatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
' e$ y5 n; L+ F8 G7 cstatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
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1 L v" w% o4 z- {. |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.
*/
! d1 B; C6 |1 D/ h J+ ~#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
0 }$ U2 i3 c% d& d4 H, g4 b#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
2 u9 V9 h; w& a; p" ~/ I* p#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))
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/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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/* 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); \
}
/ w* X9 e5 a5 t, {6 v#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
" F0 w9 q+ D- x#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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5 {: {- E0 d2 a5 g9 o# @& D9 Z$ _/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
9 I# r V! S: L3 i# lvoid MD5Init (context)
MD5_CTX *context; /* context */
{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
*/
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.
*/
void MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
7 Z: j+ O# b+ Z1 yunsigned char *input; /* input block */
0 ~1 C) x( c" B4 n6 c n% Tunsigned int inputLen; /* length of input block */
; P1 ] R+ Z) o8 p! L; U* Z# k% b% a{
unsigned int i, index, partLen;
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/* 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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