https://openjdk.java.net/ 
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package java.security.interfaces;

import java.math.BigInteger;
import java.security.spec.AlgorithmParameterSpec;


The interface to a public or private key in
PKCS#1 v2.2 standard,
such as those for RSA, or RSASSA-PSS algorithms.

Author:Jan Luehe
See Also:
Since:1.3
/**
 * The interface to a public or private key in
 * <a href="https://tools.ietf.org/rfc/rfc8017.txt">PKCS#1 v2.2</a> standard,
 * such as those for RSA, or RSASSA-PSS algorithms.
 *
 * @author Jan Luehe
 *
 * @see RSAPublicKey
 * @see RSAPrivateKey
 *
 * @since 1.3
 */

public interface RSAKey {

    
Returns the modulus.

Returns:the modulus
/**
     * Returns the modulus.
     *
     * @return the modulus
     */
    public BigInteger getModulus();

    
Returns the parameters associated with this key.
The parameters are optional and may be either
explicitly specified or implicitly created during
key pair generation.

Implementation Requirements: The default implementation returns null.
Returns:the associated parameters, may be null
Since:11
/**
     * Returns the parameters associated with this key.
     * The parameters are optional and may be either
     * explicitly specified or implicitly created during
     * key pair generation.
     *
     * @implSpec
     * The default implementation returns {@code null}.
     *
     * @return the associated parameters, may be null
     * @since 11
     */
    default AlgorithmParameterSpec getParams() {
        return null;
    }
}