md5加密算法C++程序

乐乐天

#include "global.h"
# F% Q' P) b3 L! ~5 w0 P#include "md5.h"
, D( v) M- x/ B$ l) Y$ E) V v9 W* L* {
/* Constants for MD5Transform routine.
*/
1 U* r& u! I' N7 [5 @

#define S11 7
#define S12 12
#define S13 17
#define S14 22
; z( }9 v2 p+ f- A1 j |4 }#define S21 5
#define S22 9
9 }7 r0 l8 o9 g0 H `( V#define S23 14
9 f F! z' I& H1 v#define S24 20
7 i2 C# x/ X& x1 ]# }, r#define S31 4
#define S32 11
#define S33 16
% s( I# P& t% M#define S34 23
#define S41 6
; F! p8 j4 U" w+ v1 N3 z: I#define S42 10
#define S43 15
#define S44 21

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));
6 E8 F/ H6 m0 z9 _2 Q+ S% ostatic void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
' d& c) ]! H+ F7 j. Astatic void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
: H* B7 a9 s/ P: b$ m. l7 O
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
2 w" U/ B: M( x& K6 K: S- k* H5 {};

: h$ `, D( h2 X. j- b2 ?5 q0 t/* F, G, H and I are basic MD5 functions.
*/
& D( M2 B8 F, T. ?0 E* P#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
4 J: ?3 Q# q* _# U. V1 i#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
' U) A- B. Z( V6 V* l! M9 h#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))
( B( _7 @8 @; | n" R
/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

% y& K* ~) A' A \1 Q" a/* 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); \
}
( ~& ~/ g- G8 N0 y- E* M5 v#define II(a, b, c, d, x, s, ac) { \
(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
, \/ v# D# y7 f3 i
/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
& |4 }: p5 X3 xvoid MD5Init (context)
- Q3 r% c5 ]3 W& `0 C) WMD5_CTX *context; /* context */
! K7 k* [' V: Q! g8 s% `) U, 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;
}
1 @: V: u! s R) J- H
/* 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 */
9 M) e9 g0 e6 Y. m* f9 x3 _unsigned int inputLen; /* length of input block */
. a, o4 j* z4 e% P+ D{
unsigned int i, index, partLen;
! w: q3 G1 f7 f& ]3 `, z. Y9 q
/* Compute number of bytes mod 64 */
index = (unsigned int)((context->count[0] >> 3) & 0x3F);
" X/ k$ W3 `2 S3 l0 `
/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

guoyun786

, Y U/ \- [! @# |2 w( F3 c
* ]! Q* r1 f, t; V0 O