md5加密算法C++程序

乐乐天

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

/* Constants for MD5Transform routine.
*/

- u; T2 k1 E& [
#define S11 7
* T2 H* y4 {7 L" _ U, Z$ @' f! Z#define S12 12
#define S13 17
#define S14 22
: C* v7 o1 d. q- x/ y' X: x( I5 O6 B#define S21 5
2 Y7 T# z+ J' c* ~4 F9 ^#define S22 9
#define S23 14
#define S24 20
; O/ N$ l: q3 P#define S31 4
5 n. s6 e$ s! I/ D#define S32 11
8 d% Q- l2 f1 z5 C3 a#define S33 16
0 {9 _6 ~9 x& M9 P1 v% g#define S34 23
#define S41 6
#define S42 10
$ Z* W5 g# L/ N B& m- ?6 s#define S43 15
#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));
+ b" T5 t% O! q& Dstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
5 ?7 V8 _2 y; p0 x4 \
0 t, j8 o% r; K9 I% C, r/ sstatic 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
};
0 ~, L$ f+ r7 K+ v! Z' n
/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
" d" r& w# P+ E+ b7 V4 n#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
: o3 L z- C: _7 N& S% H; Y#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))
- i0 ~ `3 }6 f* n
- O5 _1 Q5 k/ a6 F" `/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
+ J2 o5 l' J2 m3 V+ b) l8 J
- Y) R3 f* l* v8 r3 k/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Rotation 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); \
}
9 u6 i! `! q2 h. w& Z#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
8 Y- b4 ~; t. x( F r5 T8 E5 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); \
}
$ i6 @1 e1 W! h+ j2 u#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}

. c5 e1 G9 f7 F; R' v( E% q% {, W/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
MD5_CTX *context; /* context */
1 e& b" E1 m. C/ o( o: a# G{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}

2 Q# ?* @' a b4 h- }6 t/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
+ F+ s; K( b7 \0 [4 _+ C* VMD5_CTX *context; /* context */
4 ~* k% j% d$ f( Q% ?unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
{
unsigned int i, index, partLen;
: q. ]/ E9 a) ~- m, i
/* Compute number of bytes mod 64 */
index = (unsigned int)((context->count[0] >> 3) & 0x3F);

/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

guoyun786

8 q# z7 i5 _; X; b) D
2 E" z' q. ]5 O, U