md5加密算法C++程序

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

* n% g* S' Y" N8 h/* Constants for MD5Transform routine.
*/

! I5 n1 R4 X" y0 [2 W% x0 ]# I8 X
#define S11 7
#define S12 12
#define S13 17
#define S14 22
3 ~" @0 @9 U, y( v4 H, Z#define S21 5
9 b7 X# J3 @5 R: {#define S22 9
#define S23 14
#define S24 20
#define S31 4
* p1 c( t( d8 U% H#define S32 11
#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
& O% V2 a% o2 ~1 l. U#define S44 21

v3 w# v; ~- l# @* t8 U; E2 w, `9 istatic void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
. s$ T' n6 V- g5 Wstatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
4 i" s5 S% I5 j0 Gstatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
& e' c, [! |2 D: }: s$ estatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
* u0 u E) `- Y# G8 K! g2 l- f$ e
$ r1 W2 A1 l- o7 W6 I8 v Fstatic 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
};

7 F# s+ q4 B( n: B/* F, G, H and I are basic MD5 functions.
*/
0 X0 s a4 D& S' Q; R( F6 U% e#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
6 E( `* q4 A0 N T. T#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))

0 U K. P. \9 ?3 ^4 x& s/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
) Z6 n$ n0 Y) T3 v- y, ^/ lRotation is separate from addition to prevent recomputation.
*/
. ~7 L" I# z) x) c9 R4 m#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
; J7 }( L2 ?/ j#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); \
}
2 D6 k8 q0 k' |: F" h5 `#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}

: o$ W4 S. s9 x) ]# B( K. U; x8 ]/* 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.
7 ^- O- |5 o" }2 v n( \8 J6 V*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
/ K( ?; c& p" f" b$ H4 t}

5 P3 x9 e! K2 x f1 t) f/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
& ^! z8 ^: ^9 x2 S8 Pvoid MD5Update (context, input, inputLen)
6 N; P1 b! X% e3 fMD5_CTX *context; /* context */
, G b* m5 E5 s3 B4 d9 w, punsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
) ]! R( @2 a8 U% e& c( r{
unsigned int i, index, partLen;

/* 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))
&

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4 s* ]7 C f2 l* W: w* C