md5加密算法C++程序

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#include "global.h"
* V; [9 x0 B# g) s1 i#include "md5.h"
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/* Constants for MD5Transform routine.
*/
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#define S11 7
#define S12 12
0 z2 |3 ^1 T' j- K#define S13 17
( Y7 i, [, u1 ~* ]3 `#define S14 22
#define S21 5
+ w- d6 K$ m: m/ b, s' @+ Y1 ?#define S22 9
#define S23 14
#define S24 20
#define S31 4
% f S/ T$ n' H6 C' H/ V+ s#define S32 11
2 h5 A: s+ h6 D2 X#define S33 16
; X/ _8 W$ p2 z0 d. h" T#define S34 23
' A9 b7 G4 S, F+ ?* n+ F#define S41 6
#define S42 10
2 Q# q% @0 `0 c$ t6 a/ I! [- G#define S43 15
" n1 W' W" t& {! ?1 C# m7 j! P, N#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));
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
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2 y# p% g: A- P, 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, G, H and I are basic MD5 functions.
*/
8 B$ X3 S# q! x) f3 h3 J. B#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
; `1 K9 v5 R, c! }* G3 Q. H#define H(x, y, z) ((x) ^ (y) ^ (z))
+ b; X- A- @+ Y0 W#define I(x, y, z) ((y) ^ ((x) | (~z)))

0 P/ h9 k8 O6 S" V; s# _9 `/* ROTATE_LEFT rotates x left n bits.
*/
; o' N# U( B H1 \' H- X$ [#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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* O0 h& S/ O4 P; V# {8 q6 k/* 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); \
}

/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
9 K% r& k0 C. P. X3 f! f# dvoid MD5Init (context)
. z& ]! h: V/ g) v8 h* p2 p/ PMD5_CTX *context; /* context */
3 d7 G z4 E+ b' e8 s{
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;
/ [8 ^; L4 u7 o' `7 E0 ^}

/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
7 z, j* D k$ T9 R0 Dvoid MD5Update (context, input, inputLen)
0 `+ T- `$ a2 i9 w, z1 JMD5_CTX *context; /* context */
unsigned char *input; /* input block */
; y- a' V: _4 Vunsigned 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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