md5加密算法C++程序

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#include "global.h"
#include "md5.h"

' I! [$ p% ^" o, m/* Constants for MD5Transform routine.
*/

( P) P" | `% T6 K
#define S11 7
+ F8 k% t* J- l W#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
# s7 D% [. s1 l: l; ]& ~" T#define S31 4
#define S32 11
/ t6 O0 ?: l( S }' i' b, t) ], u* V#define S33 16
$ h# ?& l- R7 q& R#define S34 23
#define S41 6
C9 C$ Z5 N# e* v5 G#define S42 10
#define S43 15
#define S44 21
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static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
' i: x9 T& o/ q {, ]static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
1 R# \& g$ x8 j2 f& P. fstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
; x2 Q, ^: B3 z4 A: |static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
6 p) |! @# ^! F: O1 z
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
};

' W3 X- q" \9 a4 F1 D- S/* F, G, H and I are basic MD5 functions.
*/
" k' o9 d& n' e c#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)))

/* ROTATE_LEFT rotates x left n bits.
*/
S% Z1 O! P: m( F" G6 Q#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
! ?- b9 o* _' [2 {0 G. w
/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
3 ~$ o1 z1 h, `2 u" ]Rotation is separate from addition to prevent recomputation.
*/
0 d3 t' D6 Y9 I. {- r9 ^#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
! Y$ C" V* C8 @; ~4 U7 w#define GG(a, b, c, d, x, s, ac) { \
(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
2 c ~ @' e( t#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); \
}

0 ]8 c% v6 w1 I3 ], g/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
+ T, Z- t) s: l3 dMD5_CTX *context; /* context */
- ^% p! r7 A. e K& {. ^{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
4 f3 i/ E0 N7 }- U2 _% O; s' T' G*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
- g G- p$ V- A; b. k9 v# @}

6 O3 K" L0 o/ a) R! G) ?. J/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
. Y' e2 u: ?( e: i5 Avoid MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
e- E% R) d% w7 c" k; x{
unsigned int i, index, partLen;
$ `5 D5 z2 n e
/* Compute number of bytes mod 64 */
index = (unsigned int)((context->count[0] >> 3) & 0x3F);
: z5 [0 n& t% f) H, I0 m) H' I, ^
/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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