md5加密算法C++程序

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#include "global.h"
#include "md5.h"
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/* Constants for MD5Transform routine.
*/


#define S11 7
#define S12 12
#define S13 17
8 X0 r! |9 M0 Z+ X% o#define S14 22
#define S21 5
#define S22 9
5 I0 L% p- f6 D4 Q#define S23 14
" W0 L3 c8 p) g5 ?/ H# K5 L5 J#define S24 20
#define S31 4
#define S32 11
#define S33 16
$ L/ r$ U5 F- Y#define S34 23
#define S41 6
#define S42 10
7 S" ^" R; D8 ?: L: U6 P5 v5 ^#define S43 15
% |7 O, s1 [3 W9 p0 H#define S44 21

static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
S" H l7 C+ i1 z) f- rstatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
. \( K* f" h/ c1 T [8 D8 A1 Bstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
7 |- N7 ^) E' ystatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
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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
};
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9 a, \9 F7 ]# G/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
/ z$ {2 K& A+ ~/ M& C3 t#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
I2 `4 X. ]4 B* p3 S$ n#define I(x, y, z) ((y) ^ ((x) | (~z)))

/* ROTATE_LEFT rotates x left n bits.
*/
% X/ _1 G1 H6 J; P0 \#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

* m1 M2 A$ X) z* {! t6 Z/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
. |& X5 Z3 D+ ^2 ?6 t8 V; J# yRotation is separate from addition to prevent recomputation.
*/
! v0 H S& G& C! I" ^1 M! O#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
* u. a% J8 Q- N6 [9 E#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
$ P+ L! }& m: S+ [#define HH(a, b, c, d, x, s, ac) { \
(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
3 I' U/ Z" z; Q k5 d7 j" E6 N#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.
*/
) z3 m& b- b9 E7 Fvoid MD5Init (context)
, M2 U9 `) f& g# T' B* tMD5_CTX *context; /* context */
: i% U# f6 e& C8 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;
2 I& Q+ W3 [7 E; X# Q4 p6 f R}
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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)
- _) `2 Z$ m' |) t C& zMD5_CTX *context; /* context */
unsigned char *input; /* input block */
& d$ \# f& N: V, H# Uunsigned 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);
% r! V8 }8 T8 }# |8 g$ `1 w! }
/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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