md5加密算法C++程序

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#include "global.h"
#include "md5.h"
/ Q. h8 x8 G, k3 X2 ?0 A. G4 b9 N! g
! J2 k0 ?1 D4 N; k! m" M, v/* Constants for MD5Transform routine.
*/


#define S11 7
/ `3 C$ ?: E- w7 Q; L#define S12 12
#define S13 17
#define S14 22
#define S21 5
- G3 l# y* b! {2 `#define S22 9
/ O5 ]2 {0 r" Q* }" ?6 H#define S23 14
' O+ t8 a v2 w2 p$ _+ }6 ]! L#define S24 20
#define S31 4
#define S32 11
#define S33 16
. r/ R: R- S3 ^( D% I, D#define S34 23
#define S41 6
& X0 b9 `- i$ T( }( x; }) @2 l) R#define S42 10
# U) l* I2 r6 p2 ]0 ~" N! o#define S43 15
# [/ _/ m, L5 G: t# X#define S44 21

static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
; T, g, J& r" f; V6 Lstatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
7 l: [( U2 D9 d# X/ C, z! j3 a, P; zstatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
: a& ~ w2 r7 Y4 y) Xstatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

6 Z! S- h2 e. T+ o* Fstatic 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
};

( b4 o3 ^& l! K% v0 _/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
, d r' w G `2 V$ T- X2 h, ]#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))

6 y7 l' U& [* r" Y/* 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.
Rotation is separate from addition to prevent recomputation.
*/
! P2 D0 ]8 b5 v. g3 s2 A5 z#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); \
}
a& c6 g: K; J& q#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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" z( r4 B# c( w. k/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
. Y$ B1 E" a/ _2 KMD5_CTX *context; /* context */
( e) }, T. W P( s; T% J# E{
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;
|! @+ f$ s& U3 G}
# Q3 H) Z4 @: N* A" @ x
) {0 B1 m8 j. h/* 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 */
- B0 ^3 Z$ s& t% N* x( {unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
{
unsigned int i, index, partLen;
3 T* |0 D. q2 W% h; W9 z3 j
/* 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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