org.bouncycastle.asn1.cms.RsaKemParameters Maven / Gradle / Ivy

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The Bouncy Castle Java APIs for ASN.1 extension and utility APIs used to support bcpkix and bctls with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.

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/***************************************************************/
/******    DO NOT EDIT THIS CLASS bc-java SOURCE FILE     ******/
/***************************************************************/
package org.bouncycastle.asn1.cms;

import java.math.BigInteger;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;

/**
 * RFC 5990 RSA KEM parameters class.
 *  *  RsaKemParameters ::= SEQUENCE {
 *     keyDerivationFunction  KeyDerivationFunction,
 *     keyLength              KeyLength
 *   }
 *
 *   KeyDerivationFunction ::= AlgorithmIdentifier
 *   KeyLength ::= INTEGER (1..MAX)
 * 
 */
public class RsaKemParameters
    extends ASN1Object
{
    private final AlgorithmIdentifier keyDerivationFunction;
    private final BigInteger keyLength;

    private RsaKemParameters(ASN1Sequence sequence)
    {
        if (sequence.size() != 2)
        {
            throw new IllegalArgumentException("ASN.1 SEQUENCE should be of length 2");
        }
        this.keyDerivationFunction = AlgorithmIdentifier.getInstance(sequence.getObjectAt(0));
        this.keyLength = ASN1Integer.getInstance(sequence.getObjectAt(1)).getValue();
    }

    public static RsaKemParameters getInstance(
        Object  o)
    {
        if (o instanceof RsaKemParameters)
        {
            return (RsaKemParameters)o;
        }
        else if (o != null)
        {
            return new RsaKemParameters(ASN1Sequence.getInstance(o));
        }

        return null;
    }

    /**
     * Base constructor.
     *
     * @param keyDerivationFunction algorithm ID describing the key derivation function.
     * @param keyLength length of key to be derived (in bytes).
     */
    public RsaKemParameters(AlgorithmIdentifier keyDerivationFunction, int keyLength)
    {
        this.keyDerivationFunction = keyDerivationFunction;
        this.keyLength = BigInteger.valueOf(keyLength);
    }

    public AlgorithmIdentifier getKeyDerivationFunction()
    {
        return keyDerivationFunction;
    }

    public BigInteger getKeyLength()
    {
        return keyLength;
    }

    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector();

        v.add(keyDerivationFunction);
        v.add(new ASN1Integer(keyLength));

        return new DERSequence(v);
    }
}