md5加密算法C++程序

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#include "global.h"
#include "md5.h"
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/* Constants for MD5Transform routine.
*/

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#define S11 7
#define S12 12
#define S13 17
" Q" F& S5 D8 `#define S14 22
#define S21 5
4 ^% N! {. b3 K, T#define S22 9
+ w3 ], c/ @- p$ a, K7 F3 _#define S23 14
#define S24 20
- @9 P7 i) s: K; ?$ C% d! |#define S31 4
8 S6 I* H/ p7 b8 D( i+ x1 D#define S32 11
#define S33 16
#define S34 23
* j' ~! v# I) H: m9 _; d) |8 P#define S41 6
#define S42 10
1 M. Q" F n, R" l: d9 A#define S43 15
#define S44 21

static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
8 T2 G4 r4 b2 y7 C9 l# p g" ~$ C. {static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
" X6 l7 O9 b5 U" Nstatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));

! S3 G9 }% `- H% d+ P1 wstatic 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
Z2 A4 r. m4 \0 D};
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/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
; k D9 W i7 {: x: K#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
* R% k* b; n5 F9 w2 u2 t1 ~( |; @#define H(x, y, z) ((x) ^ (y) ^ (z))
4 l& P) `( x, b( `6 T$ k8 Q6 F#define I(x, y, z) ((y) ^ ((x) | (~z)))
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, n, Q) @, J3 u( u/ V9 F- m) W: l8 M/* ROTATE_LEFT rotates x left n bits.
*/
& k# @$ }+ s! J" Z/ h" l#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.
*/
! H- P! [* l0 u' }#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
8 H- m1 S5 Z9 C$ N7 e! F/ I/ Q; F) K#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); \
}
+ R& n' T/ l& D# S! S0 E. O. P#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}

# g/ `( O5 F" v$ k6 Y, A/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
' Y( M4 G! l! D8 {' \* P# _MD5_CTX *context; /* context */
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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;
: R% O" [- Y8 q9 z}

: S2 c+ ?6 v: i: B4 \/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
& d! R" K: t( r7 C1 {MD5_CTX *context; /* context */
" r* E# Z* n. D& Yunsigned char *input; /* input block */
* S) W: r5 Q; |# i/ d( Lunsigned int inputLen; /* length of input block */
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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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