md5加密算法C++程序

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#include "global.h"
1 ~' r& L0 f% q5 N#include "md5.h"

/* Constants for MD5Transform routine.
*/


#define S11 7
3 C- ]* ]1 T' U! Y4 M9 y% B#define S12 12
6 Q v5 c& j4 M+ S) ^2 b2 B7 b" @8 T#define S13 17
( n" ]$ J1 y$ b2 F: r#define S14 22
#define S21 5
#define S22 9
5 Z- F% q. c a#define S23 14
#define S24 20
8 G w( i9 [* P5 L$ {, z3 D#define S31 4
#define S32 11
& `8 H* t0 _' _2 _5 q- C#define S33 16
#define S34 23
#define S41 6
#define S42 10
! l5 }. W. A) S* z7 }% N#define S43 15
#define S44 21
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static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
$ M7 c4 o! [1 V: H0 }" W1 A4 qstatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
4 N: i4 {5 v8 W e' [static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
% `8 y) [1 f# u% Y% x; Z9 e, Cstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
4 Q) X+ Q" Q: ystatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
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, B: ]/ ^6 c" q4 X! Istatic 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.
*/
3 S7 M- d$ ?, P9 T5 z/ |#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
6 [, l U! {6 O#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)))

: e$ ^# n/ h# |5 q/* ROTATE_LEFT rotates x left n bits.
*/
# m& U- m* K* j" ?# P' B#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

& d+ n: W7 O V/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Rotation is separate from addition to prevent recomputation.
*/
3 d* {6 v' r3 e#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); \
}
& ^$ h. ~% v, l7 O" ?0 N) A# [( j: F#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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- h1 J, k2 {1 r: K6 P; D/* 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.
5 ^( E" H' t3 ?. O/ G8 R5 k6 Y*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}
* z4 s8 G8 f" m& B5 r
/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
! @ X8 Z' d3 {8 A4 I6 uvoid MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
, }0 r3 Y, B5 j$ H# r9 f{
unsigned int i, index, partLen;
# S% D/ w( @3 e* ]1 ~! M
/* Compute number of bytes mod 64 */
index = (unsigned int)((context->count[0] >> 3) & 0x3F);
- U. w2 _( i1 p
/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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