md5加密算法C++程序

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

/* Constants for MD5Transform routine.
*/


8 o" O" A: c" f#define S11 7
#define S12 12
0 d; Q+ V3 D% f4 [; k$ i+ b#define S13 17
#define S14 22
#define S21 5
7 M) @ Q6 J& I, k* ~#define S22 9
#define S23 14
1 K5 `% p' N1 |5 p: X' m& o#define S24 20
?* H7 ?; o+ O1 O& b#define S31 4
' z! W; S* f4 x4 u5 Y5 x( l8 P#define S32 11
$ N& T0 ]1 v5 k5 ^#define S33 16
# a+ _/ U* y J4 ^& b! C#define S34 23
#define S41 6
4 \, Y: M; e% D* ~- E5 j) G ^#define S42 10
4 `3 I- w$ H' e& Y7 N#define S43 15
#define S44 21

) ^5 U. s! p& V" b9 |static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
# k& [" Z) F1 Y& Sstatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
; |5 ^( J% o0 s% k3 X' M1 tstatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
- B9 q0 h! b' ]/ }+ B: `. O3 wstatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
/ k7 E' k" ]& T$ X0 ?4 b
& D9 z. b; [) Q# ~0 s. wstatic 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
- u! G& g4 z) H1 o) H};

" x+ o2 H+ C: E1 x7 W$ J) B/* F, G, H and I are basic MD5 functions.
*/
4 I2 k, T4 j# w' ]( @4 h#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
- A4 k( A6 H. t: l6 N* q: d#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
' n- j8 ]! a1 Q( r& @, I#define H(x, y, z) ((x) ^ (y) ^ (z))
. y: N4 ?8 w2 M6 V* T#define I(x, y, z) ((y) ^ ((x) | (~z)))

% V' v* @0 G9 z- K* ^/* ROTATE_LEFT rotates x left n bits.
*/
9 s% m9 v4 S @* o/ x5 n#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

3 ?% W: n, ~& p2 V0 b* D4 `" d/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Rotation is separate from addition to prevent recomputation.
*/
, N- K0 F3 s" V#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); \
}
# S+ v2 s" Q c: [4 j& @#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 */
: t0 T7 i d5 u$ l, A{
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;
}

3 E# m4 q- G* \/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
& s9 K: C, B6 R3 f! zvoid MD5Update (context, input, inputLen)
1 i/ E3 g# U3 G' CMD5_CTX *context; /* context */
5 n7 v0 R% F) M4 w+ S9 w( K# F+ L) Dunsigned 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);

/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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