md5加密算法C++程序

乐乐天

#include "global.h"
8 n, S5 R4 P V5 d" M. j#include "md5.h"
% {& N7 h& P5 h9 ~
* `* s9 R$ G9 T/* Constants for MD5Transform routine.
*/
! P$ o' `; ?& _8 E
% O& j, A1 J4 o
! {7 Y, N7 m8 s) q6 i#define S11 7
y& s) ?$ d6 ?" {. W( w#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
/ u `' M/ B3 e# W* D6 n+ T#define S24 20
' I6 g+ o! t0 N2 d#define S31 4
9 e! l8 U. x5 S+ R$ [+ E& H#define S32 11
#define S33 16
#define S34 23
8 j5 F" u5 U1 d7 b#define S41 6
, X. D8 N: j+ h( a0 r#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));
# r- ]0 e& g1 i2 E# R- p1 q8 X% p( Fstatic 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));

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
' t1 y6 K u9 ^: Q. L8 E};

/* F, G, H and I are basic MD5 functions.
*/
3 g0 l6 i. D, z# b% s#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
9 O/ x x' \2 e! X' u#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))
+ o4 P' E J9 Z/ \+ g
5 `7 J7 d! t. p/* ROTATE_LEFT rotates x left n bits.
*/
6 B. H1 f* |- W) L* [#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
9 o8 o; f% t. g' z( d! o$ V7 ^! ^Rotation is separate from addition to prevent recomputation.
*/
8 H# O4 `4 e% z, ~1 Y#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); \
}
% ]- J. o! O$ f: ^% n& C#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.
*/
$ u- Z* a, {' w( z8 M$ G' Yvoid MD5Init (context)
MD5_CTX *context; /* context */
{
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;
}

/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
3 e H. C; e5 @+ [. ]6 Wvoid MD5Update (context, input, inputLen)
{# V( Q2 Q8 w% A5 vMD5_CTX *context; /* context */
unsigned char *input; /* input block */
l+ _/ }* }) r# h" e* a) x, O' J) uunsigned int inputLen; /* length of input block */
5 v- K3 w$ d1 u& b9 P{
unsigned int i, index, partLen;
# [* Q0 w3 S0 T" C; q
/* 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

$ U+ l) W" }4 X$ }4 _* p+ q