Curve25519 An elliptic curve that enables X25519 key agreement and Ed25519 signatures. Declarationenum Curve25519 TopicsPerforming operationsCurve25519.KeyAgreementCurve25519.Signing RelationshipsConforms ToSendableSendableMetatype See AlsoPublic key cryptographyP521P384P256SharedSecretSecureEnclaveHPKE