using Org.BouncyCastle.Math; using Org.BouncyCastle.Utilities; using System; namespace Org.BouncyCastle.Asn1.X509 { public class RsaPublicKeyStructure : Asn1Encodable { private BigInteger modulus; private BigInteger publicExponent; public BigInteger Modulus => modulus; public BigInteger PublicExponent => 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.ToString()); modulus = DerInteger.GetInstance(seq[0]).PositiveValue; publicExponent = DerInteger.GetInstance(seq[1]).PositiveValue; } public override Asn1Object ToAsn1Object() { return new DerSequence(new DerInteger(Modulus), new DerInteger(PublicExponent)); } } }