/// <summary></summary>
private void Initialise(nSignatureType eSignatureType)
{
_abFingerprint = _abHashFingerprint = _abSignature = null;
_iHashedLength = _iSignatureBits = 0;
_eVerified = nVerified.Pending;
_eSignatureType = eSignatureType;
_eTranslatedKeyFlags = nTranslatedKeyFlags.None;
_ePublicKeyAlgorithm = nPublicKeyAlgorithm.RsaEncryptOrSign;
_eHashAlgorithm = nHashAlgorithm.Sha512;
_PrivateKeyPacket = null;
_PublicKeyPacket = null;
_UserIdPacket = null;
_Cryptography = null;
_ltSubpackets = new List <PgpSignatureSubpacket>();
}
/// <summary></summary>
public void Parse(PgpPublicKey MasterKey, List <PgpToken> ltTokens = null)
{
bool isThisMasterKey = true;
byte bVersion;
byte[] abMasterFingerprint;
int i, iSubpacketPointer, iSignatureBytes, iUnhashedLength;
PgpSignature FoundSubkey;
PgpSignatureSubpacket DecodedPgpSubpacket, RawPgpSubpacket;
if ((_abRawBytes == null) || (_abRawBytes.Length < _iHeaderLength + ciSignatureHeaderLength) || (_ePacketTag != nPacketTag.Signature))
{
_eStatus = nStatus.ParseError;
}
else if (_eStatus == nStatus.OK)
{
bVersion = _abRawBytes[_iHeaderLength];
if (bVersion == cbAllowedVersion)
{
_eSignatureType = (nSignatureType)_abRawBytes[_iHeaderLength + 1];
_ePublicKeyAlgorithm = (nPublicKeyAlgorithm)_abRawBytes[_iHeaderLength + 2];
_eHashAlgorithm = (nHashAlgorithm)_abRawBytes[_iHeaderLength + 3];
_iHashedLength = (_abRawBytes[_iHeaderLength + 4] << 8) | _abRawBytes[_iHeaderLength + 5];
if (((_ePublicKeyAlgorithm == nPublicKeyAlgorithm.RsaEncryptOrSign) || (_ePublicKeyAlgorithm == nPublicKeyAlgorithm.RsaSignOnly)) &&
(_eHashAlgorithm == nHashAlgorithm.Sha1) || (_eHashAlgorithm == nHashAlgorithm.Sha256) || (_eHashAlgorithm == nHashAlgorithm.Sha384) || (_eHashAlgorithm == nHashAlgorithm.Sha512))
{
iSubpacketPointer = _iHeaderLength + ciSignatureHeaderLength;
while ((_eStatus == nStatus.OK) && (iSubpacketPointer < _iHeaderLength + ciSignatureHeaderLength + _iHashedLength))
{
RawPgpSubpacket = new PgpSignatureSubpacket(_abRawBytes, iSubpacketPointer);
if (RawPgpSubpacket.eStatus == nStatus.OK)
{
switch (RawPgpSubpacket.eType)
{
case PgpSignatureSubpacket.nSubpacketType.CreationTime: DecodedPgpSubpacket = new PgpCreationTime(RawPgpSubpacket); break;
case PgpSignatureSubpacket.nSubpacketType.KeyExpireTime: DecodedPgpSubpacket = new PgpKeyExpireTime(RawPgpSubpacket); break;
case PgpSignatureSubpacket.nSubpacketType.PreferredSymmetricAlgorithms: DecodedPgpSubpacket = new PgpPreferredSymmetricAlgorithms(RawPgpSubpacket); break;
case PgpSignatureSubpacket.nSubpacketType.IssuerKeyId: DecodedPgpSubpacket = new PgpIssuerKeyId(RawPgpSubpacket); break;
case PgpSignatureSubpacket.nSubpacketType.PreferredHashAlgorithms: DecodedPgpSubpacket = new PgpPreferredHashAlgorithms(RawPgpSubpacket); break;
case PgpSignatureSubpacket.nSubpacketType.PreferredCompressionAlgorithms: DecodedPgpSubpacket = new PgpPreferredCompressionAlgorithms(RawPgpSubpacket); break;
case PgpSignatureSubpacket.nSubpacketType.KeyServerPreferences: DecodedPgpSubpacket = new PgpKeyServerPreferences(RawPgpSubpacket); break;
case PgpSignatureSubpacket.nSubpacketType.PrimaryUserId: DecodedPgpSubpacket = new PgpPrimaryUserId(RawPgpSubpacket); break;
case PgpSignatureSubpacket.nSubpacketType.KeyFlags: DecodedPgpSubpacket = new PgpKeyFlags(RawPgpSubpacket); break;
case PgpSignatureSubpacket.nSubpacketType.RevocationReason: DecodedPgpSubpacket = new PgpRevocationReason(RawPgpSubpacket); break;
case PgpSignatureSubpacket.nSubpacketType.Features: DecodedPgpSubpacket = new PgpFeatures(RawPgpSubpacket); break;
case PgpSignatureSubpacket.nSubpacketType.MasterKeyFingerprint: DecodedPgpSubpacket = new PgpMasterKeyFingerprint(RawPgpSubpacket); break;
default: DecodedPgpSubpacket = null; Console.WriteLine("not implemented: eType=" + RawPgpSubpacket.eType.ToString()); break;
}
if ((DecodedPgpSubpacket == null) || (DecodedPgpSubpacket.eStatus != nStatus.OK))
{
_eStatus = nStatus.ParseError;
}
else
{
// Console.WriteLine("found eType=" + RawPgpSubpacket.eType.ToString());
_ltSubpackets.Add(DecodedPgpSubpacket);
iSubpacketPointer += (RawPgpSubpacket.iHeaderLength + RawPgpSubpacket.iDataLength);
}
}
else
{
_eStatus = nStatus.ParseError;
}
}
iUnhashedLength = (_abRawBytes[iSubpacketPointer] << 8) | _abRawBytes[iSubpacketPointer + 1];
iSubpacketPointer += 2;
while ((_eStatus == nStatus.OK) && (iSubpacketPointer < _iHashedLength + iUnhashedLength + 8))
{
RawPgpSubpacket = new PgpSignatureSubpacket(_abRawBytes, iSubpacketPointer);
if (RawPgpSubpacket.eStatus == nStatus.OK)
{
switch (RawPgpSubpacket.eType)
{
case PgpSignatureSubpacket.nSubpacketType.IssuerKeyId: DecodedPgpSubpacket = new PgpIssuerKeyId(RawPgpSubpacket); break;
default: DecodedPgpSubpacket = null; Console.WriteLine("not implemented: eType=" + RawPgpSubpacket.eType.ToString()); break;
}
if ((DecodedPgpSubpacket == null) || (DecodedPgpSubpacket.eStatus != nStatus.OK))
{
_eStatus = nStatus.ParseError;
}
else
{
_ltSubpackets.Add(DecodedPgpSubpacket);
iSubpacketPointer += (RawPgpSubpacket.iHeaderLength + RawPgpSubpacket.iDataLength);
}
}
else
{
_eStatus = nStatus.ParseError;
}
}
_abFingerprint = ComputeFingerprint();
_eTranslatedKeyFlags = TranslateKeyFlags();
if (_abRawBytes.Length > iSubpacketPointer + 2)
{
_abHashFingerprint = CopyFromRawBytes(iSubpacketPointer, 2);
_iSignatureBits = _abRawBytes[iSubpacketPointer + 2] << 8 | _abRawBytes[iSubpacketPointer + 3];
iSignatureBytes = (_iSignatureBits + 7) >> 3;
iSubpacketPointer += 4;
if (_abRawBytes.Length == iSubpacketPointer + iSignatureBytes)
{
_abSignature = CopyFromRawBytes(iSubpacketPointer, iSignatureBytes);
if (_PublicKeyPacket != null)
{
_PublicKeyPacket.Signature = this;
}
abMasterFingerprint = abMasterKeyFingerprint; // do the underlying checks only once
if ((abMasterFingerprint != null) && (abMasterFingerprint.Length == ciSha1FingerprintLength) && (MasterKey.Signature != null) &&
(MasterKey.Signature.abFingerprint != null) && (MasterKey.Signature.abFingerprint.Length == ciSha1FingerprintLength))
{
for (i = 0; i < ciSha1FingerprintLength; i++)
{
isThisMasterKey = isThisMasterKey && (abMasterFingerprint[i] == MasterKey.Signature.abFingerprint[i]);
}
if (!isThisMasterKey)
{
MasterKey = null;
if (ltTokens != null)
{
foreach (PgpToken Token in ltTokens)
{
if (MasterKey == null)
{
FoundSubkey = Token.GetSubkey(abMasterFingerprint);
if (FoundSubkey != null)
{
MasterKey = FoundSubkey.PublicKeyPacket;
}
}
}
}
}
}
if (MasterKey == null)
{
_eVerified = nVerified.KeyNotFound;
}
else if (Verify(MasterKey))
{
_eVerified = nVerified.True;
}
else
{
_eVerified = nVerified.False;
}
}
else
{
_eStatus = nStatus.ParseError;
}
}
else
{
_eStatus = nStatus.ParseError;
}
}
else
{
_eStatus = nStatus.AlgorithmNotSupported;
}
}
else
{
_eStatus = nStatus.VersionNotSupported;
}
}
// else keep the value of _eStatus from PgpPacketBase
}
