md5加密算法C++程序

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#include "global.h"
#include "md5.h"
/ U9 e; l4 i1 _$ g+ x/ t
: H$ {7 `* ]9 S$ G" T/* Constants for MD5Transform routine.
*/

# l+ {8 V2 O: F! b1 n: }& W
& S) ^, w3 n. n8 B& ^8 d#define S11 7
( r9 O9 T) [0 i9 R#define S12 12
#define S13 17
#define S14 22
! {# j- H9 R' Q+ g% ]#define S21 5
1 M# P" N. O+ G! V#define S22 9
#define S23 14
#define S24 20
$ E0 _- D/ F' x: c4 H. T/ w! {#define S31 4
2 j, U* u+ n% F* v#define S32 11
+ k! `- t) _: t$ F#define S33 16
$ |9 D+ s9 c1 ` k2 }, N#define S34 23
5 x" F# w: R+ q+ W#define S41 6
9 P" J2 v/ v' G/ n4 [; X#define S42 10
#define S43 15
#define S44 21
; i% q& l! z& X/ [! @
static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
% v+ Z3 |0 ^8 z4 zstatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
+ I2 ?5 T% d) S9 e }7 C. `) zstatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
7 b0 |% z) I% d' _2 G6 b* }static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
7 O3 K4 {4 V% l w l0 S
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
};
U8 F4 Y# G* h2 {( I
9 g$ L) h, z( Y7 X& R @9 V/* F, G, H and I are basic MD5 functions.
*/
. ^$ j0 M$ D1 e3 m( d#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
: ]2 U+ p' D' q1 [( @+ H#define H(x, y, z) ((x) ^ (y) ^ (z))
, \& h" @2 k) i1 N$ e#define I(x, y, z) ((y) ^ ((x) | (~z)))

/* ROTATE_LEFT rotates x left n bits.
*/
* r2 W* y K$ G/ [: d0 v#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

/* 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.
*/
void MD5Init (context)
MD5_CTX *context; /* context */
1 G0 ]# D, `1 @$ s9 t3 u{
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;
}

5 m, e6 R/ ~$ b8 W" T) R/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
! t9 ?5 X% c2 E0 [% s5 i8 VMD5_CTX *context; /* context */
unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
{
unsigned int i, index, partLen;
# S8 Y5 G$ U& k
/* 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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