1 files changed, 103 insertions, 0 deletions
diff --git a/crypto/src/bcpg/PublicKeyEncSessionPacket.cs b/crypto/src/bcpg/PublicKeyEncSessionPacket.cs
new file mode 100644
index 000000000..d10605f1d
--- /dev/null
+++ b/crypto/src/bcpg/PublicKeyEncSessionPacket.cs
@@ -0,0 +1,103 @@
+using System;
+using System.IO;
+
+using Org.BouncyCastle.Math;
+
+namespace Org.BouncyCastle.Bcpg
+{
+ /// <remarks>Basic packet for a PGP public key.</remarks>
+ public class PublicKeyEncSessionPacket
+ : ContainedPacket //, PublicKeyAlgorithmTag
+ {
+ private int version;
+ private long keyId;
+ private PublicKeyAlgorithmTag algorithm;
+ private BigInteger[] data;
+
+ internal PublicKeyEncSessionPacket(
+ BcpgInputStream bcpgIn)
+ {
+ version = bcpgIn.ReadByte();
+
+ keyId |= (long)bcpgIn.ReadByte() << 56;
+ keyId |= (long)bcpgIn.ReadByte() << 48;
+ keyId |= (long)bcpgIn.ReadByte() << 40;
+ keyId |= (long)bcpgIn.ReadByte() << 32;
+ keyId |= (long)bcpgIn.ReadByte() << 24;
+ keyId |= (long)bcpgIn.ReadByte() << 16;
+ keyId |= (long)bcpgIn.ReadByte() << 8;
+ keyId |= (uint)bcpgIn.ReadByte();
+
+ algorithm = (PublicKeyAlgorithmTag) bcpgIn.ReadByte();
+
+ switch ((PublicKeyAlgorithmTag) algorithm)
+ {
+ case PublicKeyAlgorithmTag.RsaEncrypt:
+ case PublicKeyAlgorithmTag.RsaGeneral:
+ data = new BigInteger[]{ new MPInteger(bcpgIn).Value };
+ break;
+ case PublicKeyAlgorithmTag.ElGamalEncrypt:
+ case PublicKeyAlgorithmTag.ElGamalGeneral:
+ data = new BigInteger[]
+ {
+ new MPInteger(bcpgIn).Value,
+ new MPInteger(bcpgIn).Value
+ };
+ break;
+ default:
+ throw new IOException("unknown PGP public key algorithm encountered");
+ }
+ }
+
+ public PublicKeyEncSessionPacket(
+ long keyId,
+ PublicKeyAlgorithmTag algorithm,
+ BigInteger[] data)
+ {
+ this.version = 3;
+ this.keyId = keyId;
+ this.algorithm = algorithm;
+ this.data = (BigInteger[]) data.Clone();
+ }
+
+ public int Version
+ {
+ get { return version; }
+ }
+
+ public long KeyId
+ {
+ get { return keyId; }
+ }
+
+ public PublicKeyAlgorithmTag Algorithm
+ {
+ get { return algorithm; }
+ }
+
+ public BigInteger[] GetEncSessionKey()
+ {
+ return (BigInteger[]) data.Clone();
+ }
+
+ public override void Encode(
+ BcpgOutputStream bcpgOut)
+ {
+ MemoryStream bOut = new MemoryStream();
+ BcpgOutputStream pOut = new BcpgOutputStream(bOut);
+
+ pOut.WriteByte((byte) version);
+
+ pOut.WriteLong(keyId);
+
+ pOut.WriteByte((byte)algorithm);
+
+ for (int i = 0; i != data.Length; i++)
+ {
+ MPInteger.Encode(pOut, data[i]);
+ }
+
+ bcpgOut.WritePacket(PacketTag.PublicKeyEncryptedSession , bOut.ToArray(), true);
+ }
+ }
+}
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