md5加密算法C++程序

乐乐天

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

/* Constants for MD5Transform routine.
*/
( ?) Q! i) @5 G

#define S11 7
#define S12 12
#define S13 17
+ {1 g' r8 t6 p& z#define S14 22
#define S21 5
#define S22 9
8 S. b2 K! t3 {7 P4 y! U) D- L; \#define S23 14
/ N8 Q8 j1 c0 p2 c#define S24 20
#define S31 4
#define S32 11
S7 K; r* ]9 ~) l! M: K#define S33 16
#define S34 23
4 O4 I4 w* z% [1 e3 H9 z1 t4 E8 b#define S41 6
#define S42 10
#define S43 15
#define S44 21

static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
' e% }0 F# c3 D2 a Z1 Astatic 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));
" _8 m- b$ T1 i5 l% |6 I
7 `/ o4 x& A6 b) t8 @* R- [' c( V. Zstatic 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
, o1 j. P7 q( D0 r; j+ ~: o};

/* F, G, H and I are basic MD5 functions.
*/
2 _6 S1 M7 _0 N J9 N#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
: y. [3 Q' x1 w- [8 G5 c' x9 D" I#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)))

K; m6 ^- H5 O" I9 b# U0 w/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

}: K7 H* F: n5 {4 H/* 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.
*/
6 J* c( W6 g" J; Kvoid MD5Init (context)
# n V! x0 e: m) x5 ?* @9 AMD5_CTX *context; /* context */
, E( v* g7 ~7 e; T$ J. m* ^{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
* p8 k6 V; `2 X! K! z- {1 z*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}

% V& s# Q& t7 F4 U7 n/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
- ]6 b, }9 [5 B# G( R9 {6 xMD5_CTX *context; /* context */
unsigned char *input; /* input block */
T! n* k2 O9 x7 h' C% @( j) @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))
&

guoyun786

, K$ N- @8 s- O9 O" ?