md5加密算法C++程序

乐乐天

#include "global.h"
" e1 l- }- f/ U5 {4 A; ]' z& J#include "md5.h"

' {/ j/ M1 R% ^; a/* Constants for MD5Transform routine.
*/
R2 {% z; V9 c4 |; }$ {! y
: |! S: G4 X4 i, K
1 p( M4 y( _1 h. V#define S11 7
#define S12 12
#define S13 17
! X4 r4 v4 A$ B7 m2 k- l#define S14 22
#define S21 5
# ~ u# m+ y0 N5 H#define S22 9
% x; ?# c% c. z/ f- H#define S23 14
#define S24 20
#define S31 4
#define S32 11
) o! ]' I+ w8 _, K9 ~4 N! @$ s#define S33 16
$ R* y* A7 m+ {& k- n" o$ u#define S34 23
#define S41 6
8 n" e5 y9 A7 C' B1 x#define S42 10
#define S43 15
#define S44 21
) f- k9 L) B7 O/ O: D" b, e
static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
9 e I$ C+ d( g! cstatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
static void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
$ J: M3 G4 H( K; |5 C# Z9 {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
};

/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
6 i( c1 }: H/ k( e& v& s0 r#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
4 U' G9 G+ s0 r8 ?' M% X2 u#define H(x, y, z) ((x) ^ (y) ^ (z))
9 @* V4 M8 A3 U* ? i6 O#define I(x, y, z) ((y) ^ ((x) | (~z)))

0 t' y8 t" ~, T; Z% }' S8 J/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

5 o' J9 v2 N7 ~% S& c/* 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); \
}
: g0 t7 S/ F4 K$ R6 f3 T#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 */
{
context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
$ H8 _9 w0 B; B* w, u*/
context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}
1 r. p& C8 V& _6 `$ R& v
1 r# a+ I2 y" \( O( A/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
& U; B$ j. _, B( k& ~. ZMD5_CTX *context; /* context */
unsigned char *input; /* input block */
5 N( L0 _0 [4 t6 T Wunsigned 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

- I" D% j- N% U4 }5 o/ H" o8 R' w