package org.bouncycastle.asn1.x509; import java.io.ByteArrayInputStream; import java.io.IOException; import java.util.Enumeration; import org.bouncycastle.asn1.ASN1EncodableVector; import org.bouncycastle.asn1.ASN1Sequence; import org.bouncycastle.asn1.ASN1TaggedObject; import org.bouncycastle.asn1.DERBitString; import org.bouncycastle.asn1.DEREncodable; import org.bouncycastle.asn1.DERInputStream; import org.bouncycastle.asn1.DERObject; import org.bouncycastle.asn1.DERSequence; /** * The object that contains the public key stored in a certficate. * <p> * The getEncoded() method in the public keys in the JCE produces a DER * encoded one of these. */ public class SubjectPublicKeyInfo implements DEREncodable { private AlgorithmIdentifier algId; private DERBitString keyData; public static SubjectPublicKeyInfo getInstance( ASN1TaggedObject obj, boolean explicit) { return getInstance(ASN1Sequence.getInstance(obj, explicit)); } public static SubjectPublicKeyInfo getInstance( Object obj) { if (obj instanceof SubjectPublicKeyInfo) { return (SubjectPublicKeyInfo)obj; } else if (obj instanceof ASN1Sequence) { return new SubjectPublicKeyInfo((ASN1Sequence)obj); } throw new IllegalArgumentException("unknown object in factory"); } public SubjectPublicKeyInfo( AlgorithmIdentifier algId, DEREncodable publicKey) { this.keyData = new DERBitString(publicKey); this.algId = algId; } public SubjectPublicKeyInfo( AlgorithmIdentifier algId, byte[] publicKey) { this.keyData = new DERBitString(publicKey); this.algId = algId; } public SubjectPublicKeyInfo( ASN1Sequence seq) { Enumeration e = seq.getObjects(); this.algId = AlgorithmIdentifier.getInstance(e.nextElement()); this.keyData = (DERBitString)e.nextElement(); } public AlgorithmIdentifier getAlgorithmId() { return algId; } /** * for when the public key is an encoded object - if the bitstring * can't be decoded this routine throws an IOException. * * @exception IOException - if the bit string doesn't represent a DER * encoded object. */ public DERObject getPublicKey() throws IOException { ByteArrayInputStream bIn = new ByteArrayInputStream(keyData.getBytes()); DERInputStream dIn = new DERInputStream(bIn); return dIn.readObject(); } /** * for when the public key is raw bits... */ public DERBitString getPublicKeyData() { return keyData; } /** * Produce an object suitable for an ASN1OutputStream. * <pre> * SubjectPublicKeyInfo ::= SEQUENCE { * algorithm AlgorithmIdentifier, * publicKey BIT STRING } * </pre> */ public DERObject getDERObject() { ASN1EncodableVector v = new ASN1EncodableVector(); v.add(algId); v.add(keyData); return new DERSequence(v); } }