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using System;
using System.IO;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Security;
namespace Org.BouncyCastle.Bcpg.OpenPgp
{
/// <remarks>A one pass signature object.</remarks>
public class PgpOnePassSignature
{
private static OnePassSignaturePacket Cast(Packet packet)
{
if (!(packet is OnePassSignaturePacket))
throw new IOException("unexpected packet in stream: " + packet);
return (OnePassSignaturePacket)packet;
}
private readonly OnePassSignaturePacket sigPack;
private readonly int signatureType;
private ISigner sig;
private byte lastb;
internal PgpOnePassSignature(
BcpgInputStream bcpgInput)
: this(Cast(bcpgInput.ReadPacket()))
{
}
internal PgpOnePassSignature(
OnePassSignaturePacket sigPack)
{
this.sigPack = sigPack;
this.signatureType = sigPack.SignatureType;
}
/// <summary>Initialise the signature object for verification.</summary>
public void InitVerify(
PgpPublicKey pubKey)
{
lastb = 0;
try
{
sig = SignerUtilities.GetSigner(
PgpUtilities.GetSignatureName(sigPack.KeyAlgorithm, sigPack.HashAlgorithm));
}
catch (Exception e)
{
throw new PgpException("can't set up signature object.", e);
}
try
{
sig.Init(false, pubKey.GetKey());
}
catch (InvalidKeyException e)
{
throw new PgpException("invalid key.", e);
}
}
public void Update(
byte b)
{
if (signatureType == PgpSignature.CanonicalTextDocument)
{
doCanonicalUpdateByte(b);
}
else
{
sig.Update(b);
}
}
private void doCanonicalUpdateByte(
byte b)
{
if (b == '\r')
{
doUpdateCRLF();
}
else if (b == '\n')
{
if (lastb != '\r')
{
doUpdateCRLF();
}
}
else
{
sig.Update(b);
}
lastb = b;
}
private void doUpdateCRLF()
{
sig.Update((byte)'\r');
sig.Update((byte)'\n');
}
public void Update(
byte[] bytes)
{
if (signatureType == PgpSignature.CanonicalTextDocument)
{
for (int i = 0; i != bytes.Length; i++)
{
doCanonicalUpdateByte(bytes[i]);
}
}
else
{
sig.BlockUpdate(bytes, 0, bytes.Length);
}
}
public void Update(
byte[] bytes,
int off,
int length)
{
if (signatureType == PgpSignature.CanonicalTextDocument)
{
int finish = off + length;
for (int i = off; i != finish; i++)
{
doCanonicalUpdateByte(bytes[i]);
}
}
else
{
sig.BlockUpdate(bytes, off, length);
}
}
/// <summary>Verify the calculated signature against the passed in PgpSignature.</summary>
public bool Verify(
PgpSignature pgpSig)
{
byte[] trailer = pgpSig.GetSignatureTrailer();
sig.BlockUpdate(trailer, 0, trailer.Length);
return sig.VerifySignature(pgpSig.GetSignature());
}
public long KeyId
{
get { return sigPack.KeyId; }
}
public int SignatureType
{
get { return sigPack.SignatureType; }
}
public HashAlgorithmTag HashAlgorithm
{
get { return sigPack.HashAlgorithm; }
}
public PublicKeyAlgorithmTag KeyAlgorithm
{
get { return sigPack.KeyAlgorithm; }
}
public byte[] GetEncoded()
{
MemoryStream bOut = new MemoryStream();
Encode(bOut);
return bOut.ToArray();
}
public void Encode(
Stream outStr)
{
BcpgOutputStream.Wrap(outStr).WritePacket(sigPack);
}
}
}
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