md5加密算法C++程序

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

- k7 f; j5 O* q6 R/* Constants for MD5Transform routine.
*/


#define S11 7
#define S12 12
/ ?. A Y" Y: W: s' ^#define S13 17
#define S14 22
' N+ T7 m( [. W+ F9 \) l% A6 ]#define S21 5
#define S22 9
- |, e5 J: o) f4 Z, d: t#define S23 14
; z+ A) {0 S+ H( q9 {: F$ I! u#define S24 20
5 P3 `! w2 h$ b/ M#define S31 4
& h m# r' Q0 a% x1 D#define S32 11
#define S33 16
C( L5 \$ s4 f5 Z; x#define S34 23
' _: Z Y/ E7 o. F2 R#define S41 6
#define S42 10
#define S43 15
#define S44 21

) }/ }! \: c* \4 C+ T4 bstatic void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
& _" B" n7 P3 K# s2 L& ?: Zstatic 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));
0 m: n, I& U5 e b, |static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
$ o# f% ?/ |* k, {& A: @
- [: {3 W O* U: `% f: Cstatic 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
};

3 Z6 }- }' g1 x/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
2 w; r2 O+ |6 c6 Y#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)))

2 ^+ F: l& \, K3 C: P* e/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

8 V" |! o, G" `% [* b3 h% y/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
* }" H) y+ F" h5 T+ oRotation is separate from addition to prevent recomputation.
*/
#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); \
}
4 C0 O) ?/ w; L- y" m9 Y: u#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); \
}
; s1 M, `7 G3 Y8 L8 v
/* 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.
# G' K- S! k7 v9 T: N1 V*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}

( A4 {* Y/ G) f6 _5 F Q$ N0 g/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
2 s+ Y: t+ {/ G1 g1 Zvoid MD5Update (context, input, inputLen)
& W. Y! p' r, O3 E% k& X; |$ r) x7 \MD5_CTX *context; /* context */
unsigned char *input; /* input block */
+ ~4 @1 f" ?; n5 S3 z3 ?unsigned int inputLen; /* length of input block */
- t& b; j3 r0 a{
unsigned int i, index, partLen;
- f/ g2 i+ n' L: I
/* Compute number of bytes mod 64 */
index = (unsigned int)((context->count[0] >> 3) & 0x3F);
/ X3 E. e- O$ @7 _, H
/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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