blowfish.c

外国开源的硬盘加密软件

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};


// this version is only used to make pbox and sbox
static void crypt_block(BF_KEY *key, const word32 in[2], word32 out[2])
{
	word32 left = in[0];
	word32 right = in[1];

	const word32 *const s=key->sbox;
	const word32 *p=key->pbox;

	unsigned i;

	left ^= p[0];

	for (i=0; i<ROUNDS/2; i++)
	{
		right ^= (((s[GETBYTE(left,3)] + s[256+GETBYTE(left,2)])
			  ^ s[2*256+GETBYTE(left,1)]) + s[3*256+GETBYTE(left,0)])
			  ^ p[2*i+1];

		left ^= (((s[GETBYTE(right,3)] + s[256+GETBYTE(right,2)])
			 ^ s[2*256+GETBYTE(right,1)]) + s[3*256+GETBYTE(right,0)])
			 ^ p[2*i+2];
	}

	right ^= p[ROUNDS+1];

	out[0] = right;
	out[1] = left;
}


void BlowfishSetKey (BF_KEY *key, int keylength, unsigned char *key_string)
{
	unsigned i, j=0, k;
	word32 data, dspace[2] = {0, 0};
	word32 *sbox = key->sbox;
	word32 *pbox = key->pbox;

	memcpy(pbox, p_init, sizeof(p_init));
	memcpy(sbox, s_init, sizeof(s_init));

	// Xor key string into encryption key vector
	for (i=0 ; i<ROUNDS+2 ; ++i)
	{
		data = 0 ;
		for (k=0 ; k<4 ; ++k )
			data = (data << 8) | key_string[j++ % keylength];
		pbox[i] ^= data;
	}

	crypt_block(key, dspace, pbox);

	for (i=0; i<ROUNDS; i+=2)
		crypt_block(key, pbox+i, pbox+i+2);

	crypt_block(key, pbox+ROUNDS, sbox);

	for (i=0; i<4*256-2; i+=2)
		crypt_block(key, sbox+i, sbox+i+2);

	for (i=0; i < ROUNDS+2; i++)
		key->pbox_dec[ROUNDS+1-i] = pbox[i];
}


void BlowfishEncryptLE (unsigned char *inBlock, unsigned char *outBlock, BF_KEY *key, int encrypt)
{
	word32 left = LE32 (((word32 *) inBlock)[0]);
	word32 right = LE32 (((word32 *) inBlock)[1]);

	const word32 *const s = key->sbox;
	const word32 * p = encrypt ? key->pbox : key->pbox_dec;

	unsigned i;

	left ^= p[0];

	for (i=0; i<ROUNDS/2; i++)
	{
		right ^= (((s[GETBYTE(left,3)] + s[256+GETBYTE(left,2)])
			  ^ s[2*256+GETBYTE(left,1)]) + s[3*256+GETBYTE(left,0)])
			  ^ p[2*i+1];

		left ^= (((s[GETBYTE(right,3)] + s[256+GETBYTE(right,2)])
			 ^ s[2*256+GETBYTE(right,1)]) + s[3*256+GETBYTE(right,0)])
			 ^ p[2*i+2];
	}

	right ^= p[ROUNDS+1];

	((word32 *) outBlock)[0] = LE32 (right);
	((word32 *) outBlock)[1] = LE32 (left);
}