md5加密算法C++程序

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#include "global.h"
- w9 a2 r0 a# O( Y#include "md5.h"
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/* Constants for MD5Transform routine.
*/


#define S11 7
0 O" k/ E7 e# q: H9 J4 \#define S12 12
, a! M. y* ^6 \1 }#define S13 17
; V/ s, J. m: J! Q+ _+ P& B1 x#define S14 22
#define S21 5
#define S22 9
3 ]% N- K8 Z8 a; |# Y& {+ P" ^) V#define S23 14
# A# p' _- n _7 i- f- z- Y- S! u#define S24 20
4 W2 Y* \ Z o0 L" W/ Z# f" \#define S31 4
2 o9 Q- X8 ^9 p& u5 W( `; L#define S32 11
#define S33 16
#define S34 23
: T$ I/ W+ Z' @+ H7 [#define S41 6
x# M/ a5 \7 q#define S42 10
#define S43 15
( l5 Y5 D) y. J1 p$ R7 y7 c& j#define S44 21

static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
8 Z9 K* o1 R5 J# z4 a/ xstatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
/ Q8 G- _/ T+ B: U' D* Istatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
$ M* x6 X+ P j: J+ Vstatic 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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2 E; t: P. v! T( M* e; O! g4 B/* F, G, H and I are basic MD5 functions.
*/
$ a W0 f( M5 S( d#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
; c1 ?# R+ e1 I/ v#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
' V0 y, a, N$ n/ `#define I(x, y, z) ((y) ^ ((x) | (~z)))
F" G) q/ e ~' [# [; v9 [
% F) {& b6 s ~# q/* ROTATE_LEFT rotates x left n bits.
*/
% }- `5 A; k* k5 {7 D+ ]6 M! D#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

" Z4 Q9 r- M1 h8 y- f" H/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
. ?- ?7 p+ K/ `" M0 U. FRotation 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); \
}
0 a W, g( m' Z4 a2 s% j# A#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
( l: {5 T6 q2 J; O( K3 J9 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); \
}
. v s+ _: ?9 f+ h# {#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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/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
$ g" t8 H( q) u% v4 a1 U, I% _MD5_CTX *context; /* context */
{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
' v6 P0 E" w8 k; h$ k*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}
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4 f. M1 q& ~) t8 m/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
+ P) z! m/ ?) r9 iunsigned char *input; /* input block */
7 w/ @ z3 j6 i+ aunsigned int inputLen; /* length of input block */
{
unsigned int i, index, partLen;
8 e, ^" q3 J; y, v- j
/* Compute number of bytes mod 64 */
index = (unsigned int)((context->count[0] >> 3) & 0x3F);
) ~& \$ x' M+ W5 F
/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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