public boolean verify(String base64Signature, String content, String timestamp) throws Exception {
        return verify(base64Signature, content, timestamp, keyName);
    }
public boolean verify ( String base64Signature , String content , String timestamp ) throws Exception { return verify ( base64Signature , content , timestamp , keyName ) ; }
Verifies the validity of the digital signature using stored key name.

@param base64Signature The digital signature.
@param content The authorization string to which the signature was applied.
@param timestamp The timestamp of the digital signature.
@return True if the signature is valid.
@throws Exception Unspecified exception.