md5加密算法C++程序

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#include "global.h"
6 z; F+ G; r: |9 |#include "md5.h"
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2 `; v ^. }4 l' Z, b$ Q/* Constants for MD5Transform routine.
*/

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: |7 V. l7 \$ q/ x. u; v#define S11 7
3 Z: ^% X! s, W; z% e#define S12 12
- @0 z* u$ ^7 v4 F+ q#define S13 17
/ P$ l; Q' u% A4 J( J; D#define S14 22
#define S21 5
: m. |$ v2 T* L, A# F#define S22 9
0 a4 B* V, |4 P6 s+ z, s#define S23 14
: |- t f4 j1 r( V#define S24 20
#define S31 4
# i' u; E3 S' R+ D#define S32 11
' L* b% E' W. ]' K8 O#define S33 16
#define S34 23
2 D$ G. Q8 [ K }4 [( e& z( F8 i#define S41 6
( q' v# ~4 e( W4 w% t8 e! S#define S42 10
#define S43 15
6 P' q9 Z; t9 ]/ G; C( u& R#define S44 21

7 ]: z) M; e) _4 O; r7 V0 ]static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
n$ K# E# l9 u9 s* mstatic 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
};

( O6 K7 D, z3 o- d l/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
. a: \6 u+ J* l) N) i) @#define H(x, y, z) ((x) ^ (y) ^ (z))
/ y3 D6 V8 Y1 n#define I(x, y, z) ((y) ^ ((x) | (~z)))
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/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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+ F8 w' m: s2 i Y0 c. b3 q8 l/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
4 M I* p2 i6 BRotation is separate from addition to prevent recomputation.
*/
5 a9 A. R3 z6 v4 i0 M/ |% p#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); \
}
1 _) z( e2 c, j+ {& n: |0 j#define HH(a, b, c, d, x, s, ac) { \
(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
" g, [) a F# u* w#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}

0 j4 Q4 u" `& @& z. b2 a/ a/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
4 n! _5 ^# `( U) D" M4 fMD5_CTX *context; /* context */
{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
1 m0 T2 c( m- I; U( J! C4 R*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
; i. N# P% X7 S) M' k, U}

* j, @" e4 D! U3 l/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
8 q0 i x& G( G( e3 VMD5_CTX *context; /* context */
4 {" k @+ a4 {0 Nunsigned char *input; /* input block */
+ q8 M" b4 n4 ~. @6 t" _unsigned int inputLen; /* length of input block */
6 m9 H8 W9 ~8 `( V{
unsigned int i, index, partLen;

/* 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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