Keypair generates a public/private key pair using entropy from rand.

Sign signs the message with privateKey.

Verify reports whether sig is a valid signature of message by publicKey.

PrivateKeySize is the size, in bytes, of private keys as used in this package.

PublicKeySize is the size, in bytes, of public keys as used in this package.

SignatureSize is the size, in bytes, of signatures generated and verified by this package.

PrivateKey is the type of Ed25519 private keys.

PublicKey is the type of Ed25519 public keys.