Which hash is used when providing signature algorithm ED25519 or ED448? From TLS 1.3 there are two signature algorithms using edDSA:


      /* EdDSA algorithms */
      ed25519(0x0807),
      ed448(0x0808),



All the other signature-schemes provide hash information, for example:

ecdsa_secp256r1_sha256 => sha256 

rsa_pkcs1_sha384 => sha384

How can I determine when receiving edDSA signature algorithm which hash to use? 

Is there any default value for each one of them?
Hash algorithms:


Ed25519 uses SHA-512 (As referenced on wikipedia or on bearssl.org)
Ed448 uses SHAKE-256$^1$ (As referenced on bearssl.org)




$^1$ SHAKE-256 is a SHA-3 algorithm, a subgroup of the "Keccak" family.