md5加密算法C++程序

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#include "global.h"
0 a0 v) x/ b" Q# W#include "md5.h"
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/* Constants for MD5Transform routine.
*/


& x5 l% W6 L0 F6 \( i* A5 q* U#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
$ ~# O1 s; x8 Q: V: \#define S22 9
#define S23 14
#define S24 20
4 ^+ O9 W7 U0 O& j. ]0 k#define S31 4
( j$ o- t9 d# Q* ?, U#define S32 11
#define S33 16
+ ~# V& ]8 z4 h, X, J7 k#define S34 23
#define S41 6
/ T1 z) B. t, r/ J2 H. Z1 N#define S42 10
" ~# ~2 `/ W* ]3 V$ Z0 G4 I9 c$ z" j#define S43 15
#define S44 21

; U8 \( J) k) X5 \static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
) d/ V$ g) q6 ~7 Estatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
5 J7 Q9 g O$ v. D# B7 R; Nstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
8 ~, a% s# a4 ]1 ] J2 V2 a; b( _static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

( m* w- S7 K5 T9 M2 |# tstatic 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
- j5 _7 a1 e' A};

/* F, G, H and I are basic MD5 functions.
*/
+ [* `5 M0 a- ^9 c0 j! ~#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
$ m: V1 @5 [0 a$ i0 V( e#define I(x, y, z) ((y) ^ ((x) | (~z)))
! J7 b( q2 O. w; a% m
/* ROTATE_LEFT rotates x left n bits.
*/
% T) `1 p3 p* i' a1 u#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
* A/ k$ P- g: ?( M' z
/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Rotation is separate from addition to prevent recomputation.
*/
5 P* d% f, L& H. y) g4 {( v: q#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
% Y; a) d9 g, B, z3 K, }; K#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
( i: @8 \0 L9 j' E#define HH(a, b, c, d, x, s, ac) { \
(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
& s# a8 ]4 l9 y# ^7 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); \
}

/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
MD5_CTX *context; /* context */
6 @; o, N1 Q) P( g) P- w{
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;
1 D+ C" |; b. Y- ^5 u2 p$ |}
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/* 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 */
0 Z0 E+ w+ c6 o( F4 B1 ^! Kunsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
. `9 E) f' e; ]( z+ W; Y8 L{
unsigned int i, index, partLen;

/* Compute number of bytes mod 64 */
index = (unsigned int)((context->count[0] >> 3) & 0x3F);
+ ~1 h! o5 E/ D7 p+ d5 O) ^7 l
/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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& }2 \" z6 H" H E# b$ ^! }) }