md5加密算法C++程序

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

/* Constants for MD5Transform routine.
*/


! v9 d( O9 P- _1 g2 X#define S11 7
#define S12 12
3 ^6 T; G! P9 q6 r9 ^$ ~9 w#define S13 17
#define S14 22
#define S21 5
#define S22 9
M) {- l. ]3 q- D#define S23 14
#define S24 20
) P6 N' y t: C, L+ q) }4 h#define S31 4
& Z# G$ |, i: G3 |#define S32 11
#define S33 16
#define S34 23
#define S41 6
+ C ^4 V3 o2 o3 j#define S42 10
9 ^8 u& q/ k( r1 b#define S43 15
#define S44 21

static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
& b y& s5 N8 f- A) O7 d7 Estatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
$ r, o, e- u* H% h# Istatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
6 B, M5 W2 i b& g$ K, b4 p; Bstatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
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; I! V4 V$ k4 C0 `3 E) {+ g- Mstatic 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
$ V3 c3 {, ~# ?( b};
' t1 Z! R0 Z# Z( P" p H" P$ {
1 A# t9 T+ T2 _: P& j/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
9 j& |! S9 y& W 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)))

/* ROTATE_LEFT rotates x left n bits.
*/
- H6 s. d( r/ ~- H4 \5 ~#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
' D% y5 z- u) c1 ERotation is separate from addition to prevent recomputation.
*/
2 J' B' \& m/ n l#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); \
}
+ E4 m+ C% S0 z4 R. i: n#define HH(a, b, c, d, x, s, ac) { \
(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
4 P2 b* x4 f: }; I3 q% D6 C- p8 C#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)
5 g$ O9 M' T1 S5 v& w( aMD5_CTX *context; /* context */
8 h i! b0 ], S' }8 C{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
( B' V3 e0 w- y0 ^! ^5 @*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
! ~4 y# K Y+ L+ u. L}
M* m: S. h$ W6 w
/* 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 */
$ j b6 `2 D, l& cunsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
{
unsigned int i, index, partLen;

/* Compute number of bytes mod 64 */
index = (unsigned int)((context->count[0] >> 3) & 0x3F);
; V% w( c' W7 }. S; y+ l) z
/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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