TLSEXT_SIGALG_ecdsa_secp521r1_sha512
TLSEXT_SIGALG_ecdsa_secp521r1_sha512,
"ECDSA+SHA512", TLSEXT_SIGALG_ecdsa_secp521r1_sha512,
{ TLSEXT_SIGALG_ecdsa_secp521r1_sha512, TLSEXT_SIGALG_ecdsa_secp521r1_sha512_name },