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.
*/
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#define S11 7
% p( m3 L- `, c& W! _- X3 z; B" [#define S12 12
4 x: A7 J; N# M, m- W#define S13 17
$ Q; [& \5 g8 [: s- t) ]0 l6 I) W#define S14 22
1 n+ B; Y' \8 P' r2 x b#define S21 5
#define S22 9
#define S23 14
#define S24 20
" s$ {/ n# U, R/ d* N#define S31 4
#define S32 11
#define S33 16
#define S34 23
- B, I3 _' P# z2 f#define S41 6
1 N" S; ^( y5 Q) D$ F#define S42 10
#define S43 15
#define S44 21

static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
8 c& B9 X+ Y5 |: i- d9 bstatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
( }2 ] }8 M9 G/ n2 p$ Z& estatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
# b7 c- u. O; wstatic 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
. ~/ \1 d7 X; C. i};

3 P6 _4 l N6 \& E6 u% |/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
: N' D1 H5 `" Q) N, `# f& _' `#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
; z7 T2 ]! y2 R! e/ J1 U: a#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))
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. i8 i! i2 V# r8 O9 N$ ?/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

6 H* J: x9 S, W! X9 V! |/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
+ @- e9 S3 s" I& A/ ]Rotation is separate from addition to prevent recomputation.
*/
% M) z0 Q6 B% ^#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
+ k' K- g2 E* I& G, ]#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
, U: X: [4 w( x. ^' j6 F6 P; ]#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); \
}

/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
9 S$ g) R2 [; ]1 hvoid MD5Init (context)
. W2 u$ w' c( b0 h; ?+ g! JMD5_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;
}

4 Z& @/ s0 j% Y/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
! _% R1 A! T" M+ k/ c0 a0 J6 lvoid MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
0 o/ Z3 ]( n" n" Uunsigned char *input; /* input block */
4 M- m/ X) \. @1 Ounsigned int inputLen; /* length of input block */
) P. x n' V0 @{
unsigned int i, index, partLen;
+ t, ?( i C6 d# m9 \
/* 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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