md5加密算法C++程序

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

/* Constants for MD5Transform routine.
*/
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#define S11 7
9 \6 K O' K E9 V$ P#define S12 12
8 \- {& I r( q- B ~3 m/ \#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
' r4 ^) E/ d# i+ n#define S24 20
#define S31 4
/ y* T1 d D7 h8 G' Z+ D* h#define S32 11
" `7 C- L' p. G- ~3 j5 p1 {#define S33 16
* H: {- g$ m O% j+ `3 {; h#define S34 23
7 x- G( Y( E- ?$ G- z8 X6 l#define S41 6
* g* _& q; N; `, c#define S42 10
2 ]- t6 q+ {" Q9 R9 N- b8 A7 w4 }5 d8 ~#define S43 15
4 c5 D7 J& Z* u( G#define S44 21
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; `2 z2 Q. D z* w* M3 ?static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
* s* B; N1 ^. U, c/ Vstatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
% h; S0 l5 @5 @; e" ustatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

6 U7 q2 ^9 E8 K9 Y- z8 @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' B5 @' B) h, N: W$ w};

/* F, G, H and I are basic MD5 functions.
*/
& N! O# h" Y% D8 }. f$ b! \#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
6 b. G) X6 w: {: Y7 b- V#define H(x, y, z) ((x) ^ (y) ^ (z))
% B# @# `4 }; l. p9 B+ l#define I(x, y, z) ((y) ^ ((x) | (~z)))

/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
( m9 s$ {2 v/ l4 C7 X: NRotation is separate from addition to prevent recomputation.
*/
# T3 }: X0 {0 E% R! n! [( }#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
; F$ x; c( s3 t: @#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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/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
% Z" @" r) `0 e: aMD5_CTX *context; /* context */
; r. ~: @8 ?* K/ g{
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;
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) y6 U, B6 S' c4 @% y6 d/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
7 a% X, \4 r' H; e' ivoid MD5Update (context, input, inputLen)
4 Q5 N! R$ w7 a6 L9 e$ AMD5_CTX *context; /* context */
. H4 R& ~0 {! B, yunsigned char *input; /* input block */
, R1 o- E* C2 j4 L7 \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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