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using System;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1.X509
{
public class RsaPublicKeyStructure
: Asn1Encodable
{
private BigInteger modulus;
private BigInteger publicExponent;
public static RsaPublicKeyStructure GetInstance(
Asn1TaggedObject obj,
bool explicitly)
{
return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
}
public static RsaPublicKeyStructure GetInstance(
object obj)
{
if (obj == null || obj is RsaPublicKeyStructure)
{
return (RsaPublicKeyStructure) obj;
}
if (obj is Asn1Sequence)
{
return new RsaPublicKeyStructure((Asn1Sequence) obj);
}
throw new ArgumentException("Invalid RsaPublicKeyStructure: " + Platform.GetTypeName(obj));
}
public RsaPublicKeyStructure(
BigInteger modulus,
BigInteger publicExponent)
{
if (modulus == null)
throw new ArgumentNullException("modulus");
if (publicExponent == null)
throw new ArgumentNullException("publicExponent");
if (modulus.SignValue <= 0)
throw new ArgumentException("Not a valid RSA modulus", "modulus");
if (publicExponent.SignValue <= 0)
throw new ArgumentException("Not a valid RSA public exponent", "publicExponent");
this.modulus = modulus;
this.publicExponent = publicExponent;
}
private RsaPublicKeyStructure(
Asn1Sequence seq)
{
if (seq.Count != 2)
throw new ArgumentException("Bad sequence size: " + seq.Count);
// Note: we are accepting technically incorrect (i.e. negative) values here
modulus = DerInteger.GetInstance(seq[0]).PositiveValue;
publicExponent = DerInteger.GetInstance(seq[1]).PositiveValue;
}
public BigInteger Modulus
{
get { return modulus; }
}
public BigInteger PublicExponent
{
get { return publicExponent; }
}
/**
* This outputs the key in Pkcs1v2 format.
* <pre>
* RSAPublicKey ::= Sequence {
* modulus Integer, -- n
* publicExponent Integer, -- e
* }
* </pre>
*/
public override Asn1Object ToAsn1Object()
{
return new DerSequence(
new DerInteger(Modulus),
new DerInteger(PublicExponent));
}
}
}
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