md5加密算法C++程序

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#include "global.h"
# p3 w: Z& {: A#include "md5.h"
; L/ R$ \( [9 [. o) V9 m
/* Constants for MD5Transform routine.
*/
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' V( A, t q) m5 k& M0 A4 q#define S11 7
#define S12 12
#define S13 17
: X) N) V: ]% G#define S14 22
. _" C/ p5 i, e3 _) ~: v#define S21 5
#define S22 9
9 ]# `; R% A3 W8 R* B' v' ?#define S23 14
#define S24 20
( o. x h+ X; @7 v#define S31 4
#define S32 11
' s6 j q B5 a" i8 S#define S33 16
2 b* n$ b# e6 Z3 m: T#define S34 23
#define S41 6
! A/ O6 Z# c) r1 | J#define S42 10
4 w# q0 j; q* z$ Q/ R& x#define S43 15
#define S44 21
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4 u) O4 F5 T1 b; b. @) Dstatic void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
4 d7 \, U' b. M0 ystatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
. `4 ?/ X- N, B4 K' ystatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
8 e/ P0 A) F6 U0 z) S. ]! T/ O; istatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
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+ ^5 S+ Y0 c5 t7 ^) n* |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
- W$ L3 Q+ p5 y( \};

6 V' W: N |. j( A' y$ _/* 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)))
, u! {/ s5 ^9 B! [! L& s#define H(x, y, z) ((x) ^ (y) ^ (z))
# i' w, P3 b# y0 q0 {#define I(x, y, z) ((y) ^ ((x) | (~z)))

" O9 i* E5 S. B( i! s S/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

/* 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); \
}
7 Z7 e+ L/ j; J/ u#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
( E+ ]$ }1 `4 _% [; x8 k#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); \
}

* v- S Z; x# c5 z5 v% b/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
; C" ?; k! t1 u; p/ xvoid MD5Init (context)
MD5_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;
}
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, p& T W8 c7 J' e2 e/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
k6 Z* T$ |. _: T( ZMD5_CTX *context; /* context */
. x4 L1 q/ j& X% C r+ {% |; ounsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
{
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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