package org.bouncycastle.asn1.pkcs; import java.io.ByteArrayInputStream; import java.io.IOException; import java.math.BigInteger; import java.util.Enumeration; import org.bouncycastle.asn1.ASN1EncodableVector; import org.bouncycastle.asn1.ASN1OctetString; import org.bouncycastle.asn1.ASN1Sequence; import org.bouncycastle.asn1.DEREncodable; import org.bouncycastle.asn1.DERInputStream; import org.bouncycastle.asn1.DERInteger; import org.bouncycastle.asn1.DERObject; import org.bouncycastle.asn1.DEROctetString; import org.bouncycastle.asn1.DERSequence; import org.bouncycastle.asn1.x509.AlgorithmIdentifier; public class PrivateKeyInfo implements PKCSObjectIdentifiers, DEREncodable { private DERObject privKey; private AlgorithmIdentifier algId; public PrivateKeyInfo( AlgorithmIdentifier algId, DERObject privateKey) { this.privKey = privateKey; this.algId = algId; } public PrivateKeyInfo( ASN1Sequence seq) { Enumeration e = seq.getObjects(); BigInteger version = ((DERInteger)e.nextElement()).getValue(); if (version.intValue() != 0) { throw new IllegalArgumentException("wrong version for private key info"); } algId = new AlgorithmIdentifier((ASN1Sequence)e.nextElement()); try { ByteArrayInputStream bIn = new ByteArrayInputStream(((ASN1OctetString)e.nextElement()).getOctets()); DERInputStream dIn = new DERInputStream(bIn); privKey = dIn.readObject(); } catch (IOException ex) { throw new IllegalArgumentException("Error recoverying private key from sequence"); } } public AlgorithmIdentifier getAlgorithmId() { return algId; } public DERObject getPrivateKey() { return privKey; } /** * write out an RSA private key with it's asscociated information * as described in PKCS8. * <pre> * PrivateKeyInfo ::= SEQUENCE { * version Version, * privateKeyAlgorithm AlgorithmIdentifier {{PrivateKeyAlgorithms}}, * privateKey PrivateKey, * attributes [0] IMPLICIT Attributes OPTIONAL * } * Version ::= INTEGER {v1(0)} (v1,...) * * PrivateKey ::= OCTET STRING * * Attributes ::= SET OF Attribute * </pre> */ public DERObject getDERObject() { ASN1EncodableVector v = new ASN1EncodableVector(); v.add(new DERInteger(0)); v.add(algId); v.add(new DEROctetString(privKey)); return new DERSequence(v); } }