md5加密算法C++程序

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#include "global.h"
5 b% d8 G j2 d, |1 ?+ M6 s' Y* ?#include "md5.h"
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* s6 y& D. m8 }6 `* H9 n/* Constants for MD5Transform routine.
*/

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% o$ q. F4 a' {#define S11 7
; S H. O" f! s7 m f#define S12 12
#define S13 17
$ L4 N( x% u9 D, G$ }2 G#define S14 22
#define S21 5
; I0 N! O8 [: H1 E4 M#define S22 9
#define S23 14
) {5 P$ |( P6 D#define S24 20
#define S31 4
8 u, [4 | O9 L! X#define S32 11
#define S33 16
#define S34 23
#define S41 6
8 \9 I; p r& l- C#define S42 10
#define S43 15
#define S44 21

static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
( d. @0 z6 u$ Ostatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
; W( z5 c" y/ }9 @6 h9 nstatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
' t2 j+ s, B, V" z, O6 j. ?; Estatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
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" g$ t# W5 u, w& \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
/ x. D& }/ {' X2 d3 C};
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/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
( M1 V: j6 b1 _. ~% e6 L#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
4 ~, J' i! {" x, a/ y, d6 P& `#define H(x, y, z) ((x) ^ (y) ^ (z))
1 C9 Z1 G0 `1 r6 I/ L2 S) ^7 x" I! Y#define I(x, y, z) ((y) ^ ((x) | (~z)))

. I, z3 L0 H) y/* ROTATE_LEFT rotates x left n bits.
*/
$ p) w9 `1 V2 y. |: x/ `# P#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

& K( G4 ~, \2 X: l1 z* Z6 d& C/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
$ |7 X V) A( yRotation is separate from addition to prevent recomputation.
*/
- d9 N' h2 ]; y2 u5 Q( [# w#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); \
}
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. _- N, t" I( ~; J* L( G/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
MD5_CTX *context; /* context */
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context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
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context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
! s3 e* \: R9 f* m}

/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
8 [6 q- g/ c# R; Bvoid MD5Update (context, input, inputLen)
' c! r. O' Q. A7 \MD5_CTX *context; /* context */
unsigned char *input; /* input block */
P t6 o; M# }4 D: Y" Tunsigned int inputLen; /* length of input block */
3 C: f0 u0 }; L( B{
unsigned int i, index, partLen;
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/* Compute number of bytes mod 64 */
index = (unsigned int)((context->count[0] >> 3) & 0x3F);
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/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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