md5加密算法C++程序

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#include "global.h"
, n: ]" M$ e& \4 {/ z* w! o7 B, M#include "md5.h"

4 O+ R, Q. s" ^ J4 q, R# F/* Constants for MD5Transform routine.
*/
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#define S11 7
- H7 g6 ~/ g& l1 s#define S12 12
* l7 Y; ~2 G# P+ U# y#define S13 17
#define S14 22
#define S21 5
#define S22 9
4 u0 w: V' e N2 e#define S23 14
#define S24 20
#define S31 4
# S. z$ D) d$ P2 P! D D/ z#define S32 11
$ v, R- o: ]) G. A7 R8 e, O; s#define S33 16
#define S34 23
#define S41 6
* q& l( e" ^1 S#define S42 10
#define S43 15
#define S44 21
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static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
/ d8 V6 u% S( jstatic 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));
. A! C' P( U7 k% ^% {0 X% d. U) }1 g- Jstatic 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
@+ g" F8 F- q# {9 ^};

; a- x8 I4 F! s X. Q: Y6 E/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
" e/ H! m5 H! O+ {/ H#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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& b$ i [+ }3 Y! g* r% B& D/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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: c9 R/ q. z* {& P3 {2 P/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
# V0 w6 u9 w# z$ {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); \
}
) C# l1 v- Y; p* Z! D#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
& ?0 m: E( e; |+ o#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); \
}

' m0 p0 F6 A: n; e* C3 e$ h/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
- n- z% h% d; f% e) avoid MD5Init (context)
. Q8 H) a% i. m: p+ k+ k. M6 T+ nMD5_CTX *context; /* context */
$ N) H% i7 @3 |{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
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context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}

/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
( m8 n5 n, u: q1 evoid MD5Update (context, input, inputLen)
: _4 ~! l1 d) h8 u* W% o- RMD5_CTX *context; /* context */
unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
{
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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