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.
*/


#define S11 7
& I9 o) b& Z+ ?4 K$ z3 N#define S12 12
! t, ]$ E% o' N$ R#define S13 17
#define S14 22
4 i# D4 \, ~+ `0 b4 b#define S21 5
#define S22 9
#define S23 14
% v6 p( v; V' j1 `6 r#define S24 20
#define S31 4
# W5 c3 u+ F6 [# B6 M( {1 D0 o" B! h#define S32 11
#define S33 16
8 t3 h* `1 u+ r- t5 N* A7 v4 v#define S34 23
) M! P1 Y- ^; b. e+ f- f5 f* v#define S41 6
#define S42 10
$ H3 R+ K) G; I; V8 h8 T" D#define S43 15
) h- C3 ^1 g, t#define S44 21

static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
0 ^4 F2 R/ E. Z- O2 J* nstatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
' ^; c, R9 ^9 a9 w$ i& ~3 jstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
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$ g5 t1 }5 ?) h- t/ ]9 dstatic 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
, O9 o b' T4 e# g% B};

% O: x/ `1 ^, Q4 r0 [/* F, G, H and I are basic MD5 functions.
*/
! y1 _( f0 p0 g#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
/ N2 o6 S: v+ D+ @& Y/ d#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
. p0 h1 A" l# {( p% n* X! P) }% \#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))
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/* ROTATE_LEFT rotates x left n bits.
*/
! ]& T6 f2 ^7 P#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); \
}
#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); \
}

$ g9 K* N$ U* j! {9 A/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
8 Z8 E1 U& B' {) z' a! dvoid MD5Init (context)
* Z# ?/ W' C7 S/ X& kMD5_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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& Z" ^" g& y# z% O6 b/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
8 c- }) c7 J8 F1 G j2 Yvoid MD5Update (context, input, inputLen)
& l! ~! O# e/ M2 z- q/ ~( l5 cMD5_CTX *context; /* context */
unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
# k$ d" F! p2 M. S* Q{
unsigned int i, index, partLen;
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/* 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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