md5加密算法C++程序

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#include "global.h"
% b# `' u! U1 j L$ E/ M3 p. n#include "md5.h"

/* Constants for MD5Transform routine.
*/

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#define S11 7
#define S12 12
& j; }9 X9 B n6 w0 `#define S13 17
! s4 Y! U8 v3 ~6 h: z$ M/ F#define S14 22
#define S21 5
: n& E+ K6 \9 Z4 @$ ]#define S22 9
#define S23 14
% L o. z5 i# d- ~( z#define S24 20
#define S31 4
#define S32 11
, p$ T7 A R8 ~# `6 u8 O) _ Q#define S33 16
#define S34 23
$ ]+ I2 h8 ]1 K/ |' M ^#define S41 6
- b" l" O3 C/ _2 C( q$ {/ z#define S42 10
& u+ B; F6 f& M) X4 N, |#define S43 15
4 _" J6 Y# H+ e: S$ G#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));
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
& n) E1 x" @# ]+ z) I# Ustatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
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4 U" k" A2 e" @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)))
1 n- p- t w7 s9 n+ L#define H(x, y, z) ((x) ^ (y) ^ (z))
#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))))

/ a' F8 g/ `0 l! O `2 A9 u4 u% r/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Rotation is separate from addition to prevent recomputation.
*/
9 a8 o8 A6 k3 G3 U4 v#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); \
}
5 k! j* j0 c; U# C% L#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 Y! e# D, D3 V/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
9 ]& u1 R2 Q. K% jMD5_CTX *context; /* context */
8 E8 c4 O# O9 p2 W9 _: g{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
& Y% g8 O! N8 y*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}
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/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
! }+ ^7 n3 j" vvoid MD5Update (context, input, inputLen)
( n! H1 p( ^5 ~0 F4 m* IMD5_CTX *context; /* context */
unsigned 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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