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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 with debug enabled.
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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