| package org.bouncycastle.asn1.x509; |
| |
| import org.bouncycastle.asn1.ASN1Encodable; |
| import org.bouncycastle.asn1.ASN1EncodableVector; |
| import org.bouncycastle.asn1.ASN1Object; |
| import org.bouncycastle.asn1.ASN1ObjectIdentifier; |
| import org.bouncycastle.asn1.ASN1Primitive; |
| import org.bouncycastle.asn1.ASN1Sequence; |
| import org.bouncycastle.asn1.ASN1TaggedObject; |
| import org.bouncycastle.asn1.DERSequence; |
| |
| public class AlgorithmIdentifier |
| extends ASN1Object |
| { |
| private ASN1ObjectIdentifier algorithm; |
| private ASN1Encodable parameters; |
| |
| public static AlgorithmIdentifier getInstance( |
| ASN1TaggedObject obj, |
| boolean explicit) |
| { |
| return getInstance(ASN1Sequence.getInstance(obj, explicit)); |
| } |
| |
| public static AlgorithmIdentifier getInstance( |
| Object obj) |
| { |
| if (obj instanceof AlgorithmIdentifier) |
| { |
| return (AlgorithmIdentifier)obj; |
| } |
| else if (obj != null) |
| { |
| return new AlgorithmIdentifier(ASN1Sequence.getInstance(obj)); |
| } |
| |
| return null; |
| } |
| |
| public AlgorithmIdentifier( |
| ASN1ObjectIdentifier algorithm) |
| { |
| this.algorithm = algorithm; |
| } |
| |
| public AlgorithmIdentifier( |
| ASN1ObjectIdentifier algorithm, |
| ASN1Encodable parameters) |
| { |
| this.algorithm = algorithm; |
| this.parameters = parameters; |
| } |
| |
| private AlgorithmIdentifier( |
| ASN1Sequence seq) |
| { |
| if (seq.size() < 1 || seq.size() > 2) |
| { |
| throw new IllegalArgumentException("Bad sequence size: " |
| + seq.size()); |
| } |
| |
| algorithm = ASN1ObjectIdentifier.getInstance(seq.getObjectAt(0)); |
| |
| if (seq.size() == 2) |
| { |
| parameters = seq.getObjectAt(1); |
| } |
| else |
| { |
| parameters = null; |
| } |
| } |
| |
| public ASN1ObjectIdentifier getAlgorithm() |
| { |
| return algorithm; |
| } |
| |
| public ASN1Encodable getParameters() |
| { |
| return parameters; |
| } |
| |
| /** |
| * Produce an object suitable for an ASN1OutputStream. |
| * <pre> |
| * AlgorithmIdentifier ::= SEQUENCE { |
| * algorithm OBJECT IDENTIFIER, |
| * parameters ANY DEFINED BY algorithm OPTIONAL } |
| * </pre> |
| */ |
| public ASN1Primitive toASN1Primitive() |
| { |
| ASN1EncodableVector v = new ASN1EncodableVector(); |
| |
| v.add(algorithm); |
| |
| if (parameters != null) |
| { |
| v.add(parameters); |
| } |
| |
| return new DERSequence(v); |
| } |
| } |