跪求C语言转JAVA

风吹大了 2012-07-05 11:19:26

跪求C语言转JAVA，我不会C语言，谁帮帮我，拜谢！



#include "stdio.h"

#define u32 unsigned long int

#define u8  unsigned char

#define DES_KEY_SIZE		8

#define DES_EXPKEY_WORDS	32

#define DES_BLOCK_SIZE		8

#define DES3_EDE_KEY_SIZE	(3 * DES_KEY_SIZE)

#define DES3_EDE_EXPKEY_WORDS	(3 * DES_EXPKEY_WORDS)

#define DES3_EDE_BLOCK_SIZE	DES_BLOCK_SIZE

	static const u32 des_keymap[] = {

	0x02080008, 0x02082000, 0x00002008, 0x00000000,

	0x02002000, 0x00080008, 0x02080000, 0x02082008,

	0x00000008, 0x02000000, 0x00082000, 0x00002008,

	0x00082008, 0x02002008, 0x02000008, 0x02080000

};

static const u8 rotors[] = {

	34, 13,  5, 46, 47, 18, 32, 41, 11, 53, 33, 20,

	14, 36, 30, 24, 49,  2, 15, 37, 42, 50,  0, 21,

	38, 48,  6, 26, 39,  4, 52, 25, 12, 27, 31, 40,

	1, 17, 28, 29, 23, 51, 35,  7,  3, 22,  9, 43

};

static const u8 parity[] = {

	8,1,0,8,0,8,8,0,0,8,8,0,8,0,2,8,0,8,8,0,8,0,0,8,8,0,0,8,0,8,8,3,

	0,8,8,0,8,0,0,8,8,0,0,8,0,8,8,0,8,0,0,8,0,8,8,0,0,8,8,0,8,0,0,8,

	0,8,8,0,8,0,0,8,8,0,0,8,0,8,8,0,8,0,0,8,0,8,8,0,0,8,8,0,8,0,0,8,

	8,0,0,8,0,8,8,0,0,8,8,0,8,0,0,8,0,8,8,0,8,0,0,8,8,0,0,8,0,8,8,0

};

static void des_small_fips_decrypt(u32 *expkey, u8 *dst, const u8 *src)

{

	u32 x, y, z;



	x  = src[7];

	x <<= 8;

	x |= src[6];

	x <<= 8;

	x |= src[5];

	x <<= 8;

	x |= src[4];

	y  = src[3];

	y <<= 8;

	y |= src[2];

	y <<= 8;

	y |= src[1];

	y <<= 8;

	y |= src[0];

	

	z  = ((x >> 004) ^ y) & 0x0F0F0F0FL;

	x ^= z << 004;

	y ^= z;

	z  = ((y >> 020) ^ x) & 0x0000FFFFL;

	y ^= z << 020;

	x ^= z;

	z  = ((x >> 002) ^ y) & 0x33333333L;

	x ^= z << 002;

	y ^= z;

	z  = ((y >> 010) ^ x) & 0x00FF00FFL;

	y ^= z << 010;

	x ^= z;

	x  = x >> 1 | x << 31;

	z  = (x ^ y) & 0x55555555L;

	y ^= z;

	x ^= z;

	y  = y >> 1 | y << 31;

	z  = expkey[31];

	z ^= y;

	z  = z << 4 | z >> 28;

	x ^= * (u32 *) ((u8 *) (des_keymap + 448) + (0xFC & z));

	z >>= 8;

	x ^= * (u32 *) ((u8 *) (des_keymap + 384) + (0xFC & z));

	z >>= 8;

	x ^= * (u32 *) ((u8 *) (des_keymap + 320) + (0xFC & z));

	z >>= 8;

	x ^= * (u32 *) ((u8 *) (des_keymap + 256) + (0xFC & z));

	z  = expkey[30];

	z  = (x ^ y) & 0x55555555L;

	y ^= z;

	x ^= z;

	y  = y << 1 | y >> 31;

	z  = ((x >> 010) ^ y) & 0x00FF00FFL;

	x ^= z << 010;

	y ^= z;

	z  = ((y >> 002) ^ x) & 0x33333333L;

	y ^= z << 002;

	x ^= z;

	z  = ((x >> 020) ^ y) & 0x0000FFFFL;

	x ^= z << 020;

	y ^= z;

	z  = ((y >> 004) ^ x) & 0x0F0F0F0FL;

	y ^= z << 004;

	x ^= z;



	dst[0] = x;

	x >>= 8;

	dst[1] = x;

	x >>= 8;

	dst[2] = x;

	x >>= 8;

	dst[3] = x;

	dst[4] = y;

	y >>= 8;

	dst[5] = y;

	y >>= 8;

	dst[6] = y;

	y >>= 8;

	dst[7] = y;

}

	u32 key[DES3_EDE_EXPKEY_WORDS]={

   0x02030008, 0x02080608, 0x02030008,

   0x02080908, 0x02080508, 0x02080908,

   0x02080808, 0x02080408, 0x02080808,

   0x02080708, 0x02080308, 0x02080708

};

 void   DE( u8 *d, u8 *s)

 {  

    des_small_fips_decrypt(&key[DES_EXPKEY_WORDS * 2], d, s);

  }