Function ENC_crypt

src/common/enc.cpp:462–601

void ENC_crypt(TEXT* buf, size_t bufSize, const TEXT* key, const TEXT* setting)
{
	fb_assert(bufSize >= RESULT_SIZE);
	Firebird::MutexLockGuard guard(cryptMutex, "ENC_crypt");

	int t;
	int num_iter, salt_size;
	C_block keyblock;

	for (SLONG i = 0; i < 8; i++)
	{
		if ((t = 2 * (unsigned char) (*key)) != 0)
			key++;
		keyblock.b[i] = t;
	}
	if (des_setkey(keyblock.b))	// also initializes "a64toi"
	{
		buf[0] = 0;
		return;
	}

	char* encp = buf;
	switch (*setting)
	{
	case _PASSWORD_EFMT1:
		// Involve the rest of the password 8 characters at a time.
		while (*key)
		{
			if (des_cipher(&keyblock, &keyblock, 0L, 1))
			{
				buf[0] = 0;
				return;
			}
			for (SLONG i = 0; i < 8; i++)
			{
				if ((t = 2 * (unsigned char) (*key)) != 0)
					key++;
				keyblock.b[i] ^= t;
			}
			if (des_setkey(keyblock.b))
			{
				buf[0] = 0;
				return;
			}
		}

		*encp++ = *setting++;

		// get iteration count
		num_iter = 0;
		for (SLONG i = 4; --i >= 0;)
		{
			if ((t = (unsigned char) setting[i]) == '\0')
				t = '.';
			encp[i] = t;
			num_iter = (num_iter << 6) | a64toi[t];
		}
		setting += 4;