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package org.spongycastle.asn1.pkcs;
import java.math.BigInteger;
import java.util.Enumeration;
import org.spongycastle.asn1.ASN1EncodableVector;
import org.spongycastle.asn1.ASN1Integer;
import org.spongycastle.asn1.ASN1Object;
import org.spongycastle.asn1.ASN1Primitive;
import org.spongycastle.asn1.ASN1Sequence;
import org.spongycastle.asn1.ASN1TaggedObject;
import org.spongycastle.asn1.DERSequence;
public class RSAPublicKey
extends ASN1Object
{
private BigInteger modulus;
private BigInteger publicExponent;
public static RSAPublicKey getInstance(
ASN1TaggedObject obj,
boolean explicit)
{
return getInstance(ASN1Sequence.getInstance(obj, explicit));
}
public static RSAPublicKey getInstance(
Object obj)
{
if (obj instanceof RSAPublicKey)
{
return (RSAPublicKey)obj;
}
if (obj != null)
{
return new RSAPublicKey(ASN1Sequence.getInstance(obj));
}
return null;
}
public RSAPublicKey(
BigInteger modulus,
BigInteger publicExponent)
{
this.modulus = modulus;
this.publicExponent = publicExponent;
}
private RSAPublicKey(
ASN1Sequence seq)
{
if (seq.size() != 2)
{
throw new IllegalArgumentException("Bad sequence size: "
+ seq.size());
}
Enumeration e = seq.getObjects();
modulus = ASN1Integer.getInstance(e.nextElement()).getPositiveValue();
publicExponent = ASN1Integer.getInstance(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 ASN1Primitive toASN1Primitive()
{
ASN1EncodableVector v = new ASN1EncodableVector();
v.add(new ASN1Integer(getModulus()));
v.add(new ASN1Integer(getPublicExponent()));
return new DERSequence(v);
}
}
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