md5加密算法C++程序

乐乐天

#include "global.h"
#include "md5.h"
6 ]4 v- u* K4 K Y- c
/* Constants for MD5Transform routine.
*/
' T0 z4 V/ ]/ l: J

#define S11 7
#define S12 12
3 q- \9 G( C6 N. w; f#define S13 17
( x0 b( n' v: j' v8 `#define S14 22
#define S21 5
% N, c H) W( v2 j. i$ R/ q o#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
. g4 O0 |% L& e( Y$ Y#define S34 23
#define S41 6
#define S42 10
/ Y- [7 b# ]3 D* H8 E$ T#define S43 15
% m) {. U0 Z# I( i% H! W! I; |8 C#define S44 21
- U; A) U! b# `; e2 R( T
static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
static void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
- s( T$ Y3 n4 Rstatic 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));

3 b8 [5 o$ r( R' pstatic 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
};
* g0 f9 Z: W) J: {( ]# d
/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
0 u! s, s T+ H, s) ^6 i#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
; j: Y& F7 n. z" I+ u( k" Y#define I(x, y, z) ((y) ^ ((x) | (~z)))
- i/ A6 b$ X) H5 c! s# i M
$ a+ T: o7 r# R/ B) _) _$ x3 K/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
' I1 e& a$ O0 K& K" a) U+ C
, f0 u/ z( n5 ?8 x/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
( Q* x# m# P) u% |2 h9 i; K4 i4 `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); \
}
8 x# F8 r% i. b5 z0 q#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); \
}
- J- W5 ` ]7 X; l" o' V, J
/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
0 X ^7 J! C6 h# _/ B+ Dvoid MD5Init (context)
MD5_CTX *context; /* context */
1 S6 [5 i: n. T& o2 N% |; ~3 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;
}
& Z. U2 S. v* I$ M4 F6 N6 h5 ^0 O
; V* ^8 P& u, P7 ~( d: O% o/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
' \5 T3 Z, u1 T7 A' `" Qvoid MD5Update (context, input, inputLen)
MD5_CTX *context; /* context */
unsigned char *input; /* input block */
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

: h/ [+ g: z9 T) X6 l a
1 i+ z4 H4 v1 r