public override bool VerifySignature(SignaturePacket SigPacket)
{
if (!base.VerifySignature(SigPacket))
{
return(false);
}
return(false);
}
//public bool SeekPacket(int PacketIdx)
//{
// Reset();
// while (ReadNextPacket() != null && PacketIdx != _PacketIndex) ;
// return (PacketIdx == _PacketIndex);
//}
//public byte[] ReadPacketBytes()
//{
// // Todo fix for partial packets
// long len = _NextIdx - _Idx;
// long OldPos = _fs.Position;
// byte[] Buffer = new byte[len];
// _fs.Seek(_Idx, SeekOrigin.Begin);
// _fs.Read(Buffer, 0, (int)len);
// _fs.Seek(OldPos, SeekOrigin.Begin);
// return Buffer;
//}
private PGPPacket CreatePGPPacket(byte PacketTag)
{
PGPPacket PGPPacket;
if (PacketTag == 1)
PGPPacket = new PKEncSessionKeyPacket();
else if (PacketTag == 2)
PGPPacket = new SignaturePacket();
else if (PacketTag == 3)
PGPPacket = new SymEncSessionKeyPacket();
else if (PacketTag == 4)
PGPPacket = new OnePassSignaturePacket();
else if (PacketTag == 5)
PGPPacket = new SecretKeyPacket();
else if (PacketTag == 6)
PGPPacket = new PublicKeyPacket();
else if (PacketTag == 7)
PGPPacket = new SecretKeyPacket();
else if (PacketTag == 8)
PGPPacket = new CompressedDataPacket();
else if (PacketTag == 9)
PGPPacket = new SymEncDataPacket();
else if (PacketTag == 10)
PGPPacket = new MarkerPacket();
else if (PacketTag == 11)
PGPPacket = new LiteralDataPacket();
else if (PacketTag == 12)
PGPPacket = new TrustPacket();
else if (PacketTag == 13)
PGPPacket = new UserIDPacket();
else if (PacketTag == 14)
PGPPacket = new PublicKeyPacket();
else if (PacketTag == 17)
PGPPacket = new UserAttributePacket();
else if (PacketTag == 18)
PGPPacket = new SymEncIPDataPacket();
else if (PacketTag == 19)
PGPPacket = new MDCPacket();
else
PGPPacket = new UnknownPacket();
Length = BytesRemaining;
_PacketOffset = (int)( _fs.Position - _Idx);
PGPPacket.Length = this.Length;
PGPPacket.PacketTag = PacketTag;
PGPPacket.PacketIndex = _PacketIndex;
PGPPacket.FileName = this.FileName;
return PGPPacket;
}
public override bool VerifySignature(SignaturePacket SigPacket)
{
if (!base.VerifySignature(SigPacket))
{
return(false);
}
if (!(SigPacket.SecretKeyTransformedData is SecretKeyTransformedRSAData rsa))
{
return(false);
}
var csp = new RSACryptoServiceProvider(ModN.Length * 8);
RSAParameters param = new RSAParameters
{
Modulus = ModN,
Exponent = Exp
};
byte[] SigVerify = new byte[ModN.Length];
csp.ImportParameters(param);
if (rsa.M_D_ModN.Length > ModN.Length)
{
return(false);
}
if (rsa.M_D_ModN.Length < ModN.Length)
{
Array.Copy(rsa.M_D_ModN, 0, SigVerify, ModN.Length - rsa.M_D_ModN.Length, rsa.M_D_ModN.Length);
}
else
{
Array.Copy(rsa.M_D_ModN, SigVerify, ModN.Length);
}
try
{
bool IsMatch = csp.VerifyHash(SigPacket.HashedData, SigVerify, SigPacket.HashAlgorithmName, RSASignaturePadding.Pkcs1);
return(IsMatch);
}
catch { }
return(false);
}
public virtual bool VerifySignature(SignaturePacket SigPacket)
{
if (SigPacket.SecretKeyTransformedData == null)
{
return(false);
}
if (SigPacket.HashedData == null)
{
return(false);
}
return(true);
}
public void GenerateCertifyHash(PublicKeyPacket PKP, UserIDPacket UIDP)
{
SignaturePacket SigP = this;
int HashContextLength = 3 + PKP.PacketDataPublicKey.Length +
5 + UIDP.UserIDBytes.Length +
6 + SigP.HashedSubPacketBytes.Length
+ 6;
int idx = 3 + PKP.PacketDataPublicKey.Length;
byte[] HashContext = new byte[HashContextLength];
HashContext[0] = 0x99;
HashContext[1] = (byte)((PKP.PacketDataPublicKey.Length & 0xFF00) >> 8);
HashContext[2] = (byte)(PKP.PacketDataPublicKey.Length & 0x00FF);
Array.Copy(PKP.PacketDataPublicKey, 0, HashContext, 3, PKP.PacketDataPublicKey.Length);
HashContext[idx++] = 0xB4;
HashContext[idx++] = (byte)((UIDP.UserIDBytes.Length & 0xFF000000) >> 24);
HashContext[idx++] = (byte)((UIDP.UserIDBytes.Length & 0x00FF0000) >> 16);
HashContext[idx++] = (byte)((UIDP.UserIDBytes.Length & 0x0000FF00) >> 8);
HashContext[idx++] = (byte)(UIDP.UserIDBytes.Length & 0x000000FF);
Array.Copy(UIDP.UserIDBytes, 0, HashContext, idx, UIDP.UserIDBytes.Length);
idx += UIDP.UserIDBytes.Length;
HashContext[idx++] = SigP.Version;
HashContext[idx++] = SigP.SignatureType;
HashContext[idx++] = SigP.PKAlgo;
HashContext[idx++] = SigP.HashAlgorithm; // Version 4
HashContext[idx++] = (byte)((SigP.HashedSubPacketBytes.Length & 0xFF00) >> 8);
HashContext[idx++] = (byte)(SigP.HashedSubPacketBytes.Length & 0x00FF);
Array.Copy(SigP.HashedSubPacketBytes, 0, HashContext, idx, SigP.HashedSubPacketBytes.Length);
var HashedSubPacketLength = SigP.HashedSubPacketBytes.Length;
idx += HashedSubPacketLength;
HashContext[idx++] = 0x04;
HashContext[idx++] = 0xFF;
HashedSubPacketLength += 6; // Add the bytes before the hashed data
HashContext[idx++] = (byte)((HashedSubPacketLength & 0xFF000000) >> 24);
HashContext[idx++] = (byte)((HashedSubPacketLength & 0x00FF0000) >> 16);
HashContext[idx++] = (byte)((HashedSubPacketLength & 0x0000FF00) >> 8);
HashContext[idx++] = (byte)(HashedSubPacketLength & 0x000000FF);
HashedData = ComputeHash(HashContext);
}
public void GenerateSubKeyBindingHash(PublicKeyPacket PKP, PublicKeyPacket SubKey)
{
SignaturePacket SigP = this;
int HashContextLength = 3 + PKP.PacketDataPublicKey.Length +
3 + SubKey.PacketDataPublicKey.Length +
6 + SigP.HashedSubPacketBytes.Length
+ 6;
int idx = 0;
byte[] HashContext = new byte[HashContextLength];
HashContext[idx++] = 0x99;
HashContext[idx++] = (byte)((PKP.PacketDataPublicKey.Length & 0xFF00) >> 8);
HashContext[idx++] = (byte)(PKP.PacketDataPublicKey.Length & 0x00FF);
Array.Copy(PKP.PacketDataPublicKey, 0, HashContext, idx, PKP.PacketDataPublicKey.Length);
idx += PKP.PacketDataPublicKey.Length;
HashContext[idx++] = 0x99;
HashContext[idx++] = (byte)((SubKey.PacketDataPublicKey.Length & 0xFF00) >> 8);
HashContext[idx++] = (byte)(SubKey.PacketDataPublicKey.Length & 0x00FF);
Array.Copy(SubKey.PacketDataPublicKey, 0, HashContext, idx, SubKey.PacketDataPublicKey.Length);
idx += SubKey.PacketDataPublicKey.Length;
HashContext[idx++] = SigP.Version;
HashContext[idx++] = SigP.SignatureType;
HashContext[idx++] = SigP.PKAlgo;
HashContext[idx++] = SigP.HashAlgorithm; // Version 4
HashContext[idx++] = (byte)((SigP.HashedSubPacketBytes.Length & 0xFF00) >> 8);
HashContext[idx++] = (byte)(SigP.HashedSubPacketBytes.Length & 0x00FF);
Array.Copy(SigP.HashedSubPacketBytes, 0, HashContext, idx, SigP.HashedSubPacketBytes.Length);
var HashedSubPacketLength = SigP.HashedSubPacketBytes.Length;
idx += HashedSubPacketLength;
HashContext[idx++] = 0x04;
HashContext[idx++] = 0xFF;
HashedSubPacketLength += 6; // Add the bytes before the hashed data
HashContext[idx++] = (byte)((HashedSubPacketLength & 0xFF000000) >> 24);
HashContext[idx++] = (byte)((HashedSubPacketLength & 0x00FF0000) >> 16);
HashContext[idx++] = (byte)((HashedSubPacketLength & 0x0000FF00) >> 8);
HashContext[idx++] = (byte)(HashedSubPacketLength & 0x000000FF);
HashedData = ComputeHash(HashContext);
}
public override bool VerifySignature(SignaturePacket SigPacket)
{
if (!base.VerifySignature(SigPacket))
{
return(false);
}
if (!(SigPacket.SecretKeyTransformedData is SecretKeyTransformedDSAData dsa))
{
return(false);
}
var csp = new DSACryptoServiceProvider();
DSAParameters param = new DSAParameters
{
P = P,
Q = Q,
G = G,
Y = Y
};
csp.ImportParameters(param);
if (SigPacket.HashedData.Length < Q.Length)
{
return(false);
}
var SubHash = SigPacket.HashedData.SubArray(0, Q.Length);
byte[] SigVerify = new byte[dsa.R.Length + dsa.S.Length];
Array.Copy(dsa.R, 0, SigVerify, 0, dsa.R.Length);
Array.Copy(dsa.S, 0, SigVerify, dsa.R.Length, dsa.S.Length);
try
{
bool IsMatch = csp.VerifyHash(SubHash, SigPacket.HashAlgorithmName.Name, SigVerify);
return(IsMatch);
}
catch { }
return(false);
}
