md5加密算法C++程序

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

/* Constants for MD5Transform routine.
*/
( b; \/ g) Q" \6 k# @

0 h8 a' o5 T3 M+ N. k% }: Q#define S11 7
#define S12 12
/ }$ n6 B& s# A1 g. D#define S13 17
#define S14 22
#define S21 5
( M* }- O1 K9 L) a( S* F#define S22 9
2 J. \* H7 o' k7 c5 |7 Q& f8 `#define S23 14
$ v) w2 n3 H M: T#define S24 20
, V+ z+ v' Y3 i$ g! F. M0 ^#define S31 4
4 s: T5 C2 H2 u! g Q; {#define S32 11
8 ]9 S6 l, w: Z& C! x% C) [#define S33 16
6 g; X1 F" D! y3 J; p4 q#define S34 23
0 L; r' @7 n% b% A# ~#define S41 6
#define S42 10
7 W% D- F& N. Q6 z#define S43 15
#define S44 21
* b3 j: w. n% }" i3 O& p* M0 h
: g0 Y0 s" p# k7 p1 Wstatic void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
; _; `9 f6 y, t: vstatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
% a/ a0 C* t+ m7 Fstatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
" V( D' S9 n4 ostatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
+ s8 p/ i+ q% X* O$ e0 dstatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
' ?* A3 `! ?3 e
( G5 K7 T6 v8 Z+ b: U/ Ostatic 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
, @% U2 g! ^# i! U& F; K};

- U- ]: T2 U/ M8 X0 X% O/* 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)))
. k, _6 ]1 z: m. y#define H(x, y, z) ((x) ^ (y) ^ (z))
5 b# |, z+ r1 U/ D#define I(x, y, z) ((y) ^ ((x) | (~z)))
- M4 y% K5 _' u- {6 P; c
/* ROTATE_LEFT rotates x left n bits.
*/
! Y0 M* l5 k/ u' c9 G! W#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

8 Z& D5 J' u; t# e/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
- O; C# R$ k' G9 Y3 {) l6 dRotation is separate from addition to prevent recomputation.
*/
6 | m9 p L# 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); \
}
9 ~) c) }# P- O% p#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
7 k: e4 a4 o1 r/ \; J0 n( y#define HH(a, b, c, d, x, s, ac) { \
(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
0 e: W2 q% k3 t% {% E9 Z) j# v#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}

3 I# [. }. Y0 E# }# a- g/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
. J, k( l" I. _: A- Bvoid MD5Init (context)
MD5_CTX *context; /* context */
6 s, s- ]6 A- F9 l" W! ^' t" ^6 z{
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;
}

/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
4 _4 P! `& f7 _MD5_CTX *context; /* context */
9 K# g) b" K6 j2 l1 Q, kunsigned char *input; /* input block */
w9 [& J/ e+ g5 h* h/ kunsigned int inputLen; /* length of input block */
{
unsigned int i, index, partLen;

/* Compute number of bytes mod 64 */
index = (unsigned int)((context->count[0] >> 3) & 0x3F);

/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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