private SignatureStatus DecryptFile()
{
if (InStream.CanSeek)
{
InStream.Seek(0, SeekOrigin.Begin);
}
var inputStream = PgpUtilities.GetDecoderStream(InStream);
try
{
PgpObjectFactory pgpF = new PgpObjectFactory(inputStream);
PgpEncryptedDataList enc;
PgpObject o = pgpF.NextPgpObject();
//
// the first object might be a PGP marker packet.
//
if (o is PgpEncryptedDataList)
{
enc = (PgpEncryptedDataList)o;
}
else
{
enc = (PgpEncryptedDataList)pgpF.NextPgpObject();
}
var privateKeys = GetAllPrivateKeys();
//
// find the secret key
//
PgpPrivateKey sKey = null;
PgpPublicKeyEncryptedData pbe = null;
foreach (PgpPublicKeyEncryptedData pked in enc.GetEncryptedDataObjects())
{
sKey = FindPrivateKey(privateKeys, pked.KeyId);
if (sKey != null)
{
pbe = pked;
break;
}
}
if (sKey == null)
{
throw new SecretKeyNotFound("secret key for message not found.");
}
Stream clear = pbe.GetDataStream(sKey);
PgpLiteralData pgpLiteralData = null;
PgpOnePassSignatureList onePassSignatureList = null;
PgpSignatureList signatureList = null;
PgpObjectFactory pgpObjectFactory = new PgpObjectFactory(clear);
var pgpObject = pgpObjectFactory.NextPgpObject();
while (pgpObject != null)
{
if (pgpObject is PgpCompressedData)
{
var compressedData = (PgpCompressedData)pgpObject;
pgpObjectFactory = new PgpObjectFactory(compressedData.GetDataStream());
pgpObject = pgpObjectFactory.NextPgpObject();
}
if (pgpObject is PgpLiteralData)
{
pgpLiteralData = pgpObject as PgpLiteralData;
//must read directly to continue reading next pgp objects
Stream unc = pgpLiteralData.GetInputStream();
Streams.PipeAll(unc, OutStream);
}
else if (pgpObject is PgpOnePassSignatureList)
{
onePassSignatureList = pgpObject as PgpOnePassSignatureList;
}
else if (pgpObject is PgpSignatureList)
{
signatureList = pgpObject as PgpSignatureList;
}
pgpObject = pgpObjectFactory.NextPgpObject();
}
if (pgpLiteralData == null)
{
throw new PgpLitralDataNotFound("couldn't find pgp literal data");
}
if (pbe.IsIntegrityProtected())
{
if (!pbe.Verify())
{
throw new PgpIntegrityCheckFailed("message failed integrity check");
}
}
if (CheckSignature)
{
if (onePassSignatureList == null || signatureList == null)
{
return(SignatureStatus.NoSignature);
}
else
{
return(VerifyFileSignature(OutStream, onePassSignatureList, signatureList));
}
}
else
{
return(SignatureStatus.NotChecked);
}
}
catch
{
throw;
}
}
