md5加密算法C++程序

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#include "global.h"
$ d0 G5 C8 e0 t! g) w. G: F#include "md5.h"
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/* Constants for MD5Transform routine.
*/
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#define S11 7
& q8 F; m {8 S$ @) m0 V0 _5 k" |#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
4 N/ i6 [# o) A, s9 s#define S24 20
4 [- G1 B( T% \, \4 J& X" k9 W#define S31 4
4 d9 a) B: [3 L5 j/ U#define S32 11
' `! C- R5 T9 v/ {+ ]6 j#define S33 16
0 Y% W) Z3 M3 |2 h/ D4 c' I#define S34 23
& p [. `% v3 E" B1 A: ~#define S41 6
#define S42 10
#define S43 15
#define S44 21
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# i3 d+ r2 I, d8 H' ystatic void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
4 T v" i! G( f* e" T% w4 V) V3 hstatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
5 o7 s; Z8 c& A: Wstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
3 u$ s: a/ N6 ?0 wstatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
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static 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
/ ^% d* |) H' b+ G};

" v% N K" |$ L$ T. K& P( Y, h0 x& ?' }/* F, G, H and I are basic MD5 functions.
*/
3 m4 k+ F8 H% b8 }$ t#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))

5 x& l' c5 \; x" _3 t$ \# u/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

3 l3 n: S; H! W; K+ ]/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
# r* V) [4 m. z, B$ DRotation is separate from addition to prevent recomputation.
*/
* Y. O3 ]! z0 O#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
) ^+ k- a- y9 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); \
}

/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
MD5_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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/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
) f" u7 }9 E" C jMD5_CTX *context; /* context */
unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
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unsigned int i, index, partLen;

/* 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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