md5加密算法C++程序

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

& D) ^- j* i/ ?6 A1 }5 h4 W. U/* Constants for MD5Transform routine.
*/
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. n9 _3 p, \4 v& q# T7 j#define S11 7
#define S12 12
#define S13 17
#define S14 22
& x x, q9 U7 m#define S21 5
#define S22 9
1 _& H2 k+ p9 S& p3 F% |5 I5 h; S' O; g1 ]. u#define S23 14
#define S24 20
#define S31 4
* d! F5 q+ ^( a) Z5 X#define S32 11
#define S33 16
#define S34 23
/ a+ O0 @+ p, x* s C0 x#define S41 6
/ z) w: c8 H) ^#define S42 10
#define S43 15
#define S44 21
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static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
- C% D' ]% b6 \: S+ ustatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
* R% z( \' n& V4 u& Estatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
# P9 z1 J9 v8 G
6 u# {- x4 o4 Istatic 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
};

" Y# R. g; Y( h* G7 _/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
: b5 V; g" S( D! T2 V0 z#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
- m4 t3 R& T# z3 p2 O#define I(x, y, z) ((y) ^ ((x) | (~z)))
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/* ROTATE_LEFT rotates x left n bits.
*/
9 G p/ ]0 R" v2 ]! {" q: n* Z' }5 ]#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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+ J, u" h# I, |/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Rotation 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); \
}
; c- ]/ D4 p/ J! j#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
2 S! n% m1 \, ]+ m. [0 {* w#define HH(a, b, c, d, x, s, ac) { \
(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
& X9 J1 Q/ a+ y* h& h: z) b+ x#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}

. n* z# e d: B/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
6 @5 M* ?- q4 H& u7 h7 P2 avoid MD5Init (context)
1 `% k2 d) r, {( _3 {0 xMD5_CTX *context; /* context */
{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
2 s% e; \3 k* I0 |. S2 X*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}

' {$ o9 w g/ o& y8 y/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
8 s6 y( X, Y" t* s! p% J$ q9 uvoid MD5Update (context, input, inputLen)
6 V7 S" T8 v" Q5 P8 uMD5_CTX *context; /* context */
unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
8 t3 d: Y6 u& C6 r% d{
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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