const keys = await crypto.subtle.generateKey({

    name: "EdDSA", 
    namedCurve: "Ed28819", // or Ed448
  
}, false, ["sign", "verify"]);

const jwk = await crypto.subtle.exportKey("jwk", keys.privateKey);

{
  kty: 'OKP',
  crv: 'Ed448',
  key_ops: [ 'sign' ],
  ext: true,
  d: 't5dCIp-pFh3bABBt3cwYzQDqvQS_peqjp4WcbB0eKh6zpftEoOTgXdEI4Y9QBjrcr4zOTmi1yOIL'
}

{
  kty: 'OKP',
  crv: 'Ed448',
  key_ops: ['verify'],
  ext: true,
  x: 'Rbvo6MVDZHPwqtAGLm1vNMAVLueu1fVLW3InZDxHltEmVgWW6PnHKc2vPh_XaI2cAWOpfXnoQyk'
}

const signature = await crypto.subtle.sign({name: "EdDSA"}, keys.privateKey, data);
const ok = await crypto.subtle.verify({name: "EdDSA"}, keys.publicKey, signature, data);

const keys = await crypto.subtle.generateKey({

    name: "ECDH-ES", 
    namedCurve: "X28819", // or X448
  
}, false, ["deriveBits", "deriveKey"]);

const jwk = await crypto.subtle.exportKey("jwk", keys.privateKey);

{
  kty: 'OKP',
  crv: 'X448',
  key_ops: [ 'deriveBits', 'deriveKey' ],
  ext: true,
  d: 't5dCIp-pFh3bABBt3cwYzQDqvQS_peqjp4WcbB0eKh6zpftEoOTgXdEI4Y9QBjrcr4zOTmi1yOIL'
}

{
  kty: 'OKP',
  crv: 'X448',
  key_ops: [],
  ext: true,
  x: 'Rbvo6MVDZHPwqtAGLm1vNMAVLueu1fVLW3InZDxHltEmVgWW6PnHKc2vPh_XaI2cAWOpfXnoQyk'
}

const bits = await crypto.subtle.deriveBits({name: "ECDH-ES", public: keys.publicKey}, keys.privateKey, 256);