md5加密算法C++程序

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#include "global.h"
#include "md5.h"
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: f% m& Y @6 [! b+ g/* Constants for MD5Transform routine.
*/
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#define S11 7
#define S12 12
#define S13 17
#define S14 22
6 J7 U6 S! [! t1 O& N: r) \5 }#define S21 5
#define S22 9
9 \2 B7 R3 r8 h8 H, \$ }. V#define S23 14
/ V1 G" a7 V' ~5 l# w; b#define S24 20
7 _" B; z2 M+ I* K2 B, P) b#define S31 4
- H ~: D5 r* B( S# A6 _% a#define S32 11
#define S33 16
#define S34 23
#define S41 6
! b8 U, N& G9 P' A% P2 r#define S42 10
8 e( v- b. D' r4 Q2 ^6 l' O#define S43 15
#define S44 21
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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));
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
: z7 a5 m2 h- X) |+ T};
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/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
& ^3 A" L6 ^3 M* W#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)))
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/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

% l1 n3 f+ H0 W( l, p6 Z/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
Rotation is separate from addition to prevent recomputation.
*/
% e" f+ k' F- M4 T% q#define FF(a, b, c, d, x, s, ac) { \
(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT ((a), (s)); \
(a) += (b); \
}
G% w; k' e* r5 W' s#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); \
}
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' z7 f% {7 \1 _( R3 F/* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void MD5Init (context)
2 G& e1 |" Z* ]MD5_CTX *context; /* context */
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context->count[0] = context->count[1] = 0;
/* Load magic initialization constants.
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context->state[0] = 0x67452301;
context->state[1] = 0xefcdab89;
context->state[2] = 0x98badcfe;
context->state[3] = 0x10325476;
}

. o- E( s0 C/ @5 L; n& R3 r/* MD5 block update operation. Continues an MD5 message-digest
operation, processing another message block, and updating the
context.
*/
void MD5Update (context, input, inputLen)
6 w1 [: G# k3 w; g/ _MD5_CTX *context; /* context */
unsigned char *input; /* input block */
+ x' y7 x. u7 l8 L. m" Qunsigned int inputLen; /* length of input block */
( y* T7 S" L. o0 D6 I4 ?{
unsigned int i, index, partLen;

/* Compute number of bytes mod 64 */
index = (unsigned int)((context->count[0] >> 3) & 0x3F);
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/* Update number of bits */
if ((context->count[0] += ((UINT4)inputLen << 3))
&

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