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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8. Note: this package includes the NTRU encryption algorithms.

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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); } }




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