104 lines
2.3 KiB
C#
104 lines
2.3 KiB
C#
using System;
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using System.IO;
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using Org.BouncyCastle.Math;
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namespace Org.BouncyCastle.Bcpg
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{
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/// <remarks>Basic packet for a PGP public key.</remarks>
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public class PublicKeyEncSessionPacket
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: ContainedPacket //, PublicKeyAlgorithmTag
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{
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private int version;
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private long keyId;
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private PublicKeyAlgorithmTag algorithm;
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private BigInteger[] data;
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internal PublicKeyEncSessionPacket(
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BcpgInputStream bcpgIn)
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{
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version = bcpgIn.ReadByte();
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keyId |= (long)bcpgIn.ReadByte() << 56;
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keyId |= (long)bcpgIn.ReadByte() << 48;
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keyId |= (long)bcpgIn.ReadByte() << 40;
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keyId |= (long)bcpgIn.ReadByte() << 32;
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keyId |= (long)bcpgIn.ReadByte() << 24;
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keyId |= (long)bcpgIn.ReadByte() << 16;
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keyId |= (long)bcpgIn.ReadByte() << 8;
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keyId |= (uint)bcpgIn.ReadByte();
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algorithm = (PublicKeyAlgorithmTag) bcpgIn.ReadByte();
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switch ((PublicKeyAlgorithmTag) algorithm)
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{
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case PublicKeyAlgorithmTag.RsaEncrypt:
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case PublicKeyAlgorithmTag.RsaGeneral:
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data = new BigInteger[]{ new MPInteger(bcpgIn).Value };
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break;
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case PublicKeyAlgorithmTag.ElGamalEncrypt:
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case PublicKeyAlgorithmTag.ElGamalGeneral:
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data = new BigInteger[]
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{
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new MPInteger(bcpgIn).Value,
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new MPInteger(bcpgIn).Value
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};
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break;
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default:
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throw new IOException("unknown PGP public key algorithm encountered");
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}
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}
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public PublicKeyEncSessionPacket(
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long keyId,
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PublicKeyAlgorithmTag algorithm,
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BigInteger[] data)
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{
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this.version = 3;
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this.keyId = keyId;
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this.algorithm = algorithm;
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this.data = (BigInteger[]) data.Clone();
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}
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public int Version
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{
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get { return version; }
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}
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public long KeyId
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{
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get { return keyId; }
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}
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public PublicKeyAlgorithmTag Algorithm
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{
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get { return algorithm; }
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}
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public BigInteger[] GetEncSessionKey()
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{
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return (BigInteger[]) data.Clone();
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}
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public override void Encode(
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BcpgOutputStream bcpgOut)
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{
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MemoryStream bOut = new MemoryStream();
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BcpgOutputStream pOut = new BcpgOutputStream(bOut);
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pOut.WriteByte((byte) version);
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pOut.WriteLong(keyId);
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pOut.WriteByte((byte)algorithm);
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for (int i = 0; i != data.Length; i++)
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{
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MPInteger.Encode(pOut, data[i]);
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}
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bcpgOut.WritePacket(PacketTag.PublicKeyEncryptedSession , bOut.ToArray(), true);
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}
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}
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}
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