Function H

libi2pd/Gost.cpp:870–906

	}

	static void H (const uint8_t * iv, const uint8_t * buf, size_t len, uint8_t * digest)
	{
		// stage 1
		GOST3411Block h, N, s, m;
		memcpy (h.buf, iv, 64);
		memset (N.buf, 0, 64);
		memset (s.buf, 0, 64);
		size_t l = len;
		// stage 2
		while (l >= 64)
		{
			memcpy (m.buf, buf + l - 64, 64); // TODO
			h= gN (N, h, m);
			N.Add (512);
			s = m + s;
			l -= 64;
		}
		// stage 3
		size_t padding = 64 - l;
		if (padding)
		{
			memset (m.buf, 0, padding - 1);
			m.buf[padding - 1] = 1;
		}
		memcpy (m.buf + padding, buf, l);

		h = gN (N, h, m);
		N.Add (l*8);
		s = m + s;

		GOST3411Block N0;
		memset (N0.buf, 0, 64);
		h = gN (N0, h, N);
		h = gN (N0, h, s);

		memcpy (digest, h.buf, 64);
	}

	void GOSTR3411_2012_256 (const uint8_t * buf, size_t len, uint8_t * digest)
	{