md5加密算法C++程序

乐乐天

#include "global.h"
( z) J9 D: C' N, _0 b$ ]#include "md5.h"

/* Constants for MD5Transform routine.
*/


/ d2 H! k# @6 h; V#define S11 7
#define S12 12
#define S13 17
0 y8 Z* v, X) {#define S14 22
! r! W5 p- u, S- t* q6 e#define S21 5
#define S22 9
#define S23 14
#define S24 20
0 j. p0 M8 J( G8 D. P( P% O#define S31 4
#define S32 11
5 k& D, m) L* T& l#define S33 16
#define S34 23
B" F) ~$ H+ T" C! y#define S41 6
& Y- U; q7 w3 ~ _/ u$ y# d#define S42 10
#define S43 15
- |& J% I1 S4 i. b6 k7 m6 ]5 m1 C#define S44 21

static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
, {; C; q; T: o' D; p7 M/ n/ H9 dstatic void Encode PROTO_LIST
((unsigned char *, UINT4 *, unsigned int));
) E- J3 m+ F+ h3 V2 B6 F1 n/ H; Estatic void Decode PROTO_LIST
((UINT4 *, unsigned char *, unsigned int));
* P3 s8 |0 g6 U9 ^) J) {# [: Y7 Pstatic 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
};

- i( H' I/ Y; C, @7 D/ E/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#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)))
5 l4 o5 J4 T' o( g$ b3 j3 r' e) J: E
# ]7 T; _" S$ e) Q( e& I6 ~/* ROTATE_LEFT rotates x left n bits.
*/
/ ]. h" a% y L9 a' F( [+ F1 q* l#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.
*/
8 l0 c- ^$ r! P9 v#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
+ |2 v# y/ ]$ r+ p& k) 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); \
}

% ?: m) j9 C3 q2 Z* G/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
z0 e+ q. r; _7 E. Vvoid MD5Init (context)
* P5 G* h8 X5 R. S3 Z, n" \$ `% [MD5_CTX *context; /* context */
7 z1 Z, L% S$ z& l; ~5 m9 k2 z{
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;
: M9 ~+ e7 @$ `' S T. y}

/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
, Q; y' U3 N. D& ?MD5_CTX *context; /* context */
unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
{
unsigned int i, index, partLen;
/ O: ?: T- Z) q7 r/ [
/* 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

2 R, R: w0 ~4 S% @8 U