SHA512t256 test suite:
SHA512t256 ("") = c672b8d1ef56ed28ab87c3622c5114069bdd3ad7b8f9737498d0c01ecef0967a - verified correct
SHA512t256 ("a") = 455e518824bc0601f9fb858ff5c37d417d67c2f8e0df2babe4808858aea830f8 - verified correct
SHA512t256 ("abc") = 53048e2681941ef99b2e29b76b4c7dabe4c2d0c634fc6d46e0e2f13107e7af23 - verified correct
SHA512t256 ("message digest") = 0cf471fd17ed69d990daf3433c89b16d63dec1bb9cb42a6094604ee5d7b4e9fb - verified correct
SHA512t256 ("abcdefghijklmnopqrstuvwxyz") = fc3189443f9c268f626aea08a756abe7b726b05f701cb08222312ccfd6710a26 - verified correct
SHA512t256 ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789") = cdf1cc0effe26ecc0c13758f7b4a48e000615df241284185c39eb05d355bb9c8 - verified correct
SHA512t256 ("12345678901234567890123456789012345678901234567890123456789012345678901234567890") = 2c9fdbc0c90bdd87612ee8455474f9044850241dc105b1e8b94b8ddf5fac9148 - verified correct
SHA512t256 ("MD5 has not yet (2001-09-03) been broken, but sufficient attacks have been made that its security is in some doubt") = dd095fc859b336c30a52548b3dc59fcc0d1be8616ebcf3368fad23107db2d736 - verified correct