Function FPERM

src/cryptopp/des.cpp:98–118

}

static inline void FPERM(word32 &left, word32 &right)
{
	word32 work;

	right = rotrFixed(right, 1U);
	work = (left ^ right) & 0xaaaaaaaa;
	right ^= work;
	left = rotrFixed(left^work, 9U);
	work = (left ^ right) & 0x00ff00ff;
	right ^= work;
	left = rotlFixed(left^work, 6U);
	work = (left ^ right) & 0x33333333;
	right ^= work;
	left = rotlFixed(left^work, 18U);
	work = (left ^ right) & 0xffff0000;
	right ^= work;
	left = rotlFixed(left^work, 20U);
	work = (left ^ right) & 0xf0f0f0f0;
	right ^= work;
	left = rotrFixed(left^work, 4U);
}

void DES::Base::UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &)
{