md5加密算法C++程序

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#include "global.h"
6 z! `4 {' k! [8 n; u$ P#include "md5.h"
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/* Constants for MD5Transform routine.
*/
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#define S11 7
#define S12 12
#define S13 17
% h& H) l; \# ^3 W" U' }* t#define S14 22
$ l& @$ h% C8 S#define S21 5
#define S22 9
# u7 ?% o7 N8 X/ V! f8 m5 `#define S23 14
#define S24 20
#define S31 4
#define S32 11
/ f5 q$ i9 O5 c7 s0 [+ q! S i#define S33 16
#define S34 23
#define S41 6
' t/ A) S4 I( Y9 X$ \- W#define S42 10
$ d+ {4 m9 E8 g3 k7 W7 N2 k* c7 E9 u#define S43 15
#define S44 21

static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
0 E4 d' I- n' F( F3 tstatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
" n7 U+ X7 X# v6 {0 |* c& U0 Z# ystatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
7 t- A! P1 K; h2 F# bstatic 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
c& y, o7 |* c" ]};

/* 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)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))
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1 ~5 r, N1 l7 \6 d% D" _( ^/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

& `+ J& J6 i$ m# J& P/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
0 e+ t! P# b3 X7 Q9 q( L# xRotation is separate from addition to prevent recomputation.
*/
, h2 N- I" f2 e2 \! ~' X0 A9 P8 p2 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); \
}
' q8 p% `0 T# i, a% r* u+ k1 }#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); \
}
#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}

/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
- A1 v. @1 f, I5 Z# {MD5_CTX *context; /* context */
; o$ V& N8 M0 S( M2 p{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
1 ^4 ]$ R: j" P) P+ }' h& k* l# x*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
" N/ V# W" T3 u; D% L}
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/* 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 */
' O! ]( q' X0 ^3 T% V# aunsigned char *input; /* input block */
' P) L: i, N: c: i7 v" f$ A, Y [unsigned int inputLen; /* length of input block */
' Z' |7 P; F$ Q/ s{
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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