package org.bouncycastle.asn1.x509; import java.math.BigInteger; import java.util.Enumeration; import org.bouncycastle.asn1.ASN1EncodableVector; import org.bouncycastle.asn1.ASN1Sequence; import org.bouncycastle.asn1.ASN1TaggedObject; import org.bouncycastle.asn1.DEREncodable; import org.bouncycastle.asn1.DERInteger; import org.bouncycastle.asn1.DERObject; import org.bouncycastle.asn1.DERSequence; public class RSAPublicKeyStructure implements DEREncodable { private BigInteger modulus; private BigInteger publicExponent; public static RSAPublicKeyStructure getInstance( ASN1TaggedObject obj, boolean explicit) { return getInstance(ASN1Sequence.getInstance(obj, explicit)); } public static RSAPublicKeyStructure getInstance( Object obj) { if(obj == null || obj instanceof RSAPublicKeyStructure) { return (RSAPublicKeyStructure)obj; } if(obj instanceof ASN1Sequence) { return new RSAPublicKeyStructure((ASN1Sequence)obj); } throw new IllegalArgumentException("Invalid RSAPublicKeyStructure: " + obj.getClass().getName()); } public RSAPublicKeyStructure( BigInteger modulus, BigInteger publicExponent) { this.modulus = modulus; this.publicExponent = publicExponent; } public RSAPublicKeyStructure( ASN1Sequence seq) { Enumeration e = seq.getObjects(); modulus = ((DERInteger)e.nextElement()).getPositiveValue(); publicExponent = ((DERInteger)e.nextElement()).getPositiveValue(); } public BigInteger getModulus() { return modulus; } public BigInteger getPublicExponent() { return publicExponent; } /** * This outputs the key in PKCS1v2 format. * <pre> * RSAPublicKey ::= SEQUENCE { * modulus INTEGER, -- n * publicExponent INTEGER, -- e * } * </pre> * <p> */ public DERObject getDERObject() { ASN1EncodableVector v = new ASN1EncodableVector(); v.add(new DERInteger(getModulus())); v.add(new DERInteger(getPublicExponent())); return new DERSequence(v); } }