/**
* Checks if an XDI attribute is a valid XDI signature.
*
* @param xdiAttribute The XDI attribute to check.
* @return True if the XDI attribute is a valid XDI signature.
*/
public static boolean isValid(XdiAttribute xdiAttribute) {
if (xdiAttribute == null) return false;
return RSASignature.isValid(xdiAttribute)
|| AESSignature.isValid(xdiAttribute)
|| EC25519Signature.isValid(xdiAttribute);
}
/**
* Factory method that creates an XDI signature bound to a given XDI attribute.
*
* @param xdiAttribute The XDI signature that is an XDI signature.
* @return The XDI signature.
*/
public static Signature fromXdiAttribute(XdiAttribute xdiAttribute) {
Signature signature;
if ((signature = RSASignature.fromXdiAttribute(xdiAttribute)) != null) return signature;
if ((signature = AESSignature.fromXdiAttribute(xdiAttribute)) != null) return signature;
if ((signature = EC25519Signature.fromXdiAttribute(xdiAttribute)) != null) return signature;
return null;
}