md5加密算法C++程序

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

# d( r+ a- j4 |& E( A/* Constants for MD5Transform routine.
*/
. D& X. t& I& u4 e4 S

#define S11 7
#define S12 12
#define S13 17
M6 _# n/ b5 \" _#define S14 22
#define S21 5
#define S22 9
#define S23 14
7 r& N. T4 Z5 Y: p2 k f3 `#define S24 20
9 Y3 E& z ? f8 ~. ?" M#define S31 4
#define S32 11
#define S33 16
#define S34 23
0 W c5 o) s/ t q#define S41 6
#define S42 10
#define S43 15
$ B7 {& K; N4 T3 ~/ @( _4 Z+ h7 u#define S44 21

% ~, }/ r1 a! n) d5 a: e% o$ qstatic void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
( I8 p( a! m/ X6 }+ y% ]static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
! w' R& x! W: p* V- Gstatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
& A4 i/ M9 a; Hstatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

% c0 b4 y1 b! K) kstatic 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
) u1 P' J! x( y2 s};
& z- e/ E) x; \# ~- v
/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
d: k0 {6 l7 u7 }#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
* L9 [5 ?9 W# w G* c, H#define I(x, y, z) ((y) ^ ((x) | (~z)))

# `8 T; i4 y7 _ Y. Z0 g" Q/* ROTATE_LEFT rotates x left n bits.
*/
) s2 P$ a9 a; t1 f: r#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
% U5 Q6 p# I# b6 t0 e$ R
9 U3 z5 F! Z' X* `7 t* B5 ~6 p3 o4 W/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
0 P1 N y' d$ j! c9 V0 HRotation 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); \
}
#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); \
}

9 p" g) C. p0 V: L/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
+ A- ?0 ~5 s$ ^4 @- kvoid MD5Init (context)
MD5_CTX *context; /* context */
{
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;
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, B8 K+ y$ K0 G- }: j
/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
3 s$ i8 v3 Y* I) U0 `6 VMD5_CTX *context; /* context */
unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
{
unsigned int i, index, partLen;

/* Compute number of bytes mod 64 */
index = (unsigned int)((context->count[0] >> 3) & 0x3F);
+ z0 Y5 {6 P8 c6 t$ F3 Q* q3 B2 s5 e5 U
/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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