md5加密算法C++程序

乐乐天

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

/* Constants for MD5Transform routine.
*/

; S4 h1 m& h' n3 O" T
( F( [+ G/ `9 s3 k2 V6 o8 g) f. k% @#define S11 7
. r& q3 q2 X# q. M% u#define S12 12
1 H6 s! j5 J9 c8 {* q* e( L; T#define S13 17
#define S14 22
" `/ M/ |6 U5 G6 o$ [: ^; G#define S21 5
& q8 [0 _+ G. ~' c3 V+ p#define S22 9
#define S23 14
# |* M1 D! d% O, N/ f8 N- ]#define S24 20
3 {9 F3 H) | n#define S31 4
#define S32 11
6 B! n4 g z2 j#define S33 16
#define S34 23
, ?+ B. I& J& i: m6 a7 L- @% _/ O: w#define S41 6
4 S6 B+ s/ V) [/ M% T/ t#define S42 10
! M3 X4 m6 N% k( N5 T" H: Z5 p9 {#define S43 15
: \ s9 z! S8 b8 G8 a1 Q#define S44 21
* s# j- k1 y% Y1 T4 |8 i: P
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));

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
8 n6 w e- B2 K. }: s};
# A7 M3 N, T( ?. z. P* s' j$ u% J4 v
. ^9 j. b9 }: N/* F, G, H and I are basic MD5 functions.
*/
6 m' e- h' @. S$ l#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
+ n1 e4 u9 F6 o1 f, R/ D4 [' e#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
: n4 T. N7 L& L5 v( ?6 e5 F#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))

0 k/ l/ j6 V7 ]; [; {; t/* ROTATE_LEFT rotates x left n bits.
*/
4 C7 P8 _+ s* N0 ]& v4 d" _4 O! {#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); \
}
/ w. I- S4 E7 _$ R#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)
# m$ K' y/ }" b1 [! FMD5_CTX *context; /* context */
7 O# y6 j$ W) D. |8 t2 G+ G( h{
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;
a5 t- H, `. E# f- ~}

+ n* _4 Z/ b0 D9 d/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
7 J. j6 }! R5 O& ^1 ` F. Y{
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))
&

guoyun786

/ S. b, c/ e. W% p+ ?' n