Metaprogrammed SHA-1

gistfile1.cpp

template <uint32_t val> 
struct BigEndian {
	enum {
		value = (val & 0xFF << 24) | (val & 0xFF00 << 8) | (val & 0xFF0000 >> 8) | (val & 0xFF000000 >> 24)
	};
};

struct ShaInitVector {
	enum {
		H0 = 0x67452301,
		H1 = 0xEFCDAB89,
		H2 = 0x98BADCFE,
		H3 = 0x10325476,
		H4 = 0xC3D2E1F0
	};
};

template <uint32_t val, uint32_t r>
struct RotateLeft{
	enum { value = (val << r) | (val >> (32 - r)) };
};

template <typename InitVector, typename RoundInfo, uint32_t w>
struct ShaRound {
	enum {
		H0 = RotateLeft<InitVector::H0, 5>::value + RoundInfo::f + InitVector::H4 + RoundInfo::k + w,
		H1 = InitVector::H0,
		H2 = RotateLeft<InitVector::H1, 30>,
		H3 = InitVector::H2,
		H4 = InitVector::H3
	};
}

template <uint32_t b, uint32_t c, uint32_t d>
struct ShaF0 {
	enum {
		f = (b & c) | ((~b) & d),
		k = 0x5A827999
	 };
};

template <uint32_t b, uint32_t c, uint32_t d>
struct ShaF1 {
	enum {
		f = b ^ c ^ d,
		k = 0x6ED9EBA1
	};
};

template <uint32_t b, uint32_t c, uint32_t d>
struct ShaF2 {
	enum {
		f = (b & c) | (b & d) | (c & d),
		k = 0x8F1BBCDC
	}
};

template <uint32_t b, uint32_t c, uint32_t d>
struct ShaF3 {
	enum {
		f = b ^ c ^ d,
		k = 0xCA62C1D6
	}
};

tabs :(