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package org.spongycastle.asn1.eac;
import java.math.BigInteger;
import java.util.Enumeration;
import org.spongycastle.asn1.ASN1EncodableVector;
import org.spongycastle.asn1.ASN1ObjectIdentifier;
import org.spongycastle.asn1.ASN1Primitive;
import org.spongycastle.asn1.ASN1Sequence;
import org.spongycastle.asn1.DERSequence;
/**
* an Iso7816RSAPublicKeyStructure structure.
* <pre>
* Certificate Holder Authorization ::= SEQUENCE {
* // modulus should be at least 1024bit and a multiple of 512.
* DERTaggedObject modulus,
* // access rights exponent
* DERTaggedObject accessRights,
* }
* </pre>
*/
public class RSAPublicKey
extends PublicKeyDataObject
{
private ASN1ObjectIdentifier usage;
private BigInteger modulus;
private BigInteger exponent;
private int valid = 0;
private static int modulusValid = 0x01;
private static int exponentValid = 0x02;
RSAPublicKey(ASN1Sequence seq)
{
Enumeration en = seq.getObjects();
this.usage = ASN1ObjectIdentifier.getInstance(en.nextElement());
while (en.hasMoreElements())
{
UnsignedInteger val = UnsignedInteger.getInstance(en.nextElement());
switch (val.getTagNo())
{
case 0x1:
setModulus(val);
break;
case 0x2:
setExponent(val);
break;
default:
throw new IllegalArgumentException("Unknown DERTaggedObject :" + val.getTagNo() + "-> not an Iso7816RSAPublicKeyStructure");
}
}
if (valid != 0x3)
{
throw new IllegalArgumentException("missing argument -> not an Iso7816RSAPublicKeyStructure");
}
}
public RSAPublicKey(ASN1ObjectIdentifier usage, BigInteger modulus, BigInteger exponent)
{
this.usage = usage;
this.modulus = modulus;
this.exponent = exponent;
}
public ASN1ObjectIdentifier getUsage()
{
return usage;
}
public BigInteger getModulus()
{
return modulus;
}
public BigInteger getPublicExponent()
{
return exponent;
}
private void setModulus(UnsignedInteger modulus)
{
if ((valid & modulusValid) == 0)
{
valid |= modulusValid;
this.modulus = modulus.getValue();
}
else
{
throw new IllegalArgumentException("Modulus already set");
}
}
private void setExponent(UnsignedInteger exponent)
{
if ((valid & exponentValid) == 0)
{
valid |= exponentValid;
this.exponent = exponent.getValue();
}
else
{
throw new IllegalArgumentException("Exponent already set");
}
}
public ASN1Primitive toASN1Primitive()
{
ASN1EncodableVector v = new ASN1EncodableVector();
v.add(usage);
v.add(new UnsignedInteger(0x01, getModulus()));
v.add(new UnsignedInteger(0x02, getPublicExponent()));
return new DERSequence(v);
}
}
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