encryp.c

48位的双鱼加密解密算法

#include	"aes.h"
#include	<stdio.h>
#include	<stdlib.h>
#include	<string.h>
#include	<time.h>
#include	<ctype.h>

DWORD Here(DWORD x)
{
	unsigned int mask=~0U;

	return (* (((DWORD *)&x)-1)) & mask;
}
extern DWORD TwofishCodeSize(void);

#define keySize		128
int encryption(BYTE *plainText, int block_number, BYTE *cipherText, DWORD *Key) 
{							/* return 0 iff test passes */
	keyInstance    ki;			/* key information, including tables */
	cipherInstance ci;			/* keeps mode (ECB, CBC) and IV */
	int  i,byteCnt;

	if (makeKey(&ki,DIR_ENCRYPT,keySize,NULL) != TRUE)
		return -1;				/* 'dummy' setup for a 128-bit key */
	if (cipherInit(&ci,MODE_ECB,NULL) != TRUE)
		return -1;				/* 'dummy' setup for cipher */
	
	for (i=0;i<keySize/32;i++)	/* select key bits */
		ki.key32[i]=Key[i];
	reKey(&ki);					/* run the key schedule */

	byteCnt = (BLOCK_SIZE/8) * block_number;
	
	/* encrypt the bytes */
	if (blockEncrypt(&ci,&ki, plainText,byteCnt*8,cipherText) != byteCnt*8)
		return -1;

	return 0;
}

int decryption(BYTE *cipherText, int block_number, BYTE *plainText, DWORD *Key) 
{							/* return 0 iff test passes */
	keyInstance    ki;			/* key information, including tables */
	cipherInstance ci;			/* keeps mode (ECB, CBC) and IV */
	int  i,byteCnt;

	if (makeKey(&ki,DIR_DECRYPT,keySize,NULL) != TRUE)
		return -1;				/* 'dummy' setup for a 128-bit key */
	if (cipherInit(&ci,MODE_ECB,NULL) != TRUE)
		return -1;				/* 'dummy' setup for cipher */
	
	for (i=0;i<keySize/32;i++)	/* select key bits */
		ki.key32[i]=Key[i];
	reKey(&ki);					/* run the key schedule */

	byteCnt = (BLOCK_SIZE/8) * block_number;
	
	/* encrypt the bytes */
	if (blockDecrypt(&ci,&ki,cipherText,byteCnt*8, plainText) != byteCnt*8)
		return -1;

	return 0;
}

/*
void main(void)
{
	int block_number = 12;
	BYTE plain[12 * BLOCK_SIZE/8];
	BYTE cipher[12 * BLOCK_SIZE/8];
	BYTE result[12 * BLOCK_SIZE/8];
	DWORD key[keySize/32] = {3456, 4567, 5678, 6789};
	int ret;

	memset(plain, 0, 12 * BLOCK_SIZE/8);
	strcpy(plain, "abcdefghijklmnopqrstuvwxyz");
	ret = encryption(plain, 12, cipher, key);
	if (ret != 0)
	{
		printf("error in encryption\n");
	}
	printf("%s\n", cipher);
	ret = decryption(cipher, 12, result, key);
	if (ret != 0)
	{
		printf("error in decryption\n");
	}
	if(memcmp(plain, result, 12 * BLOCK_SIZE/8))
	{
		printf("error\n");
	}
	printf("%s:Ok\n", result);
}
*/