const golang.org/x/crypto/ed25519.PrivateKeySize

3 uses

	golang.org/x/crypto/ed25519 (current package)
		ed25519_go113.go#L31: 	PrivateKeySize = 64

	golang.org/x/crypto/ssh
		keys.go#L1378: 		if len(key.Priv) != ed25519.PrivateKeySize {
		keys.go#L1386: 		pk := ed25519.PrivateKey(make([]byte, ed25519.PrivateKeySize))