md5加密算法C++程序

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#include "global.h"
5 S% R9 Q% n% F1 l$ m! ?, I& o#include "md5.h"

, z- ^! S. Z0 R2 `: X- l/* Constants for MD5Transform routine.
*/


#define S11 7
5 ?8 G, u3 C6 v) B7 _; r! L* g#define S12 12
#define S13 17
#define S14 22
1 a/ ?( w8 w! a V#define S21 5
3 w7 y. y( | g* k3 T) a( l6 i#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
' E! p( @, m; z0 M& n( m* I) c#define S33 16
#define S34 23
6 {5 P; y6 X1 l/ {3 r#define S41 6
4 ?# C5 |( f3 p7 b#define S42 10
" c- @3 @8 }* x8 m5 f: _( {#define S43 15
#define S44 21
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static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
: f& j5 d! ^, P7 q4 V) f. ~! Fstatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
6 s, Q4 n) ^$ S, S0 R6 lstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
. @- i, }6 X1 \" k. Q6 M" K& lstatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
8 O) W, N9 m7 K) f; ~
+ E7 P4 Z" v/ t" M6 U5 cstatic 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
- F( S) G! Y% y. O1 }7 T Y% T; C* q3 H};

/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
2 z4 q4 {* D% j#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
* M, e+ P% z M- h: x1 g7 a& i9 v#define I(x, y, z) ((y) ^ ((x) | (~z)))

/* ROTATE_LEFT rotates x left n bits.
*/
0 ]8 ^( E" u- w# q; ?5 ^: [#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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3 m3 X0 R, E0 A) |1 b$ W& Z# c6 f/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
7 o# o' _# u' J+ v2 N CRotation 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); \
}
# h9 {( l% B. d' e#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); \
}

. ~9 }( j. N) h7 _/ ^* ^- K* b) l/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
& P6 l, [& l5 }& Ivoid MD5Init (context)
MD5_CTX *context; /* context */
{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
, e+ W1 C9 [5 w; f; ^7 ^; x5 F*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
1 u( G. T* Y! ]0 l) m8 w& X. B9 _}

+ p/ B: l1 t' n: U$ x: A/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
" N( Q w3 T2 Pvoid MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
unsigned char *input; /* input block */
unsigned 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);
: n# w; q% S' Y; B% P2 r
/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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