public GPGDecryptedDataReturn Decrypt(string data)
{
using (var stream = PgpUtilities.GetDecoderStream(Tools.GenerateStreamFromString(data))) {
var pgpF = new PgpObjectFactory(stream);
var o = pgpF.NextPgpObject();
var enc = o as PgpEncryptedDataList;
if (enc == null)
{
enc = (PgpEncryptedDataList)pgpF.NextPgpObject();
}
PgpPublicKeyEncryptedData pbe = null;
PgpPrivateKey pgpPrivKey = null;
PgpSecretKey pgpSec = null;
string lastFingerPrint = "None";
foreach (PgpPublicKeyEncryptedData pked in enc.GetEncryptedDataObjects())
{
string keyId = pked.KeyId.ToString("X").ToUpper();
string fingerPrint = keyId.Length < 16 ? FP8TO16[Tools.H8FP(keyId)] : Tools.H16FP(keyId);
lastFingerPrint = fingerPrint;
if (!decryptedKeys.ContainsKey(fingerPrint))
{
continue;
}
pgpSec = privateKeys[fingerPrint];
pgpPrivKey = decryptedKeys[fingerPrint];
pbe = pked;
break;
}
if (pbe == null)
{
throw new KeyNotLoadedException(lastFingerPrint);
}
var clear = pbe.GetDataStream(pgpPrivKey);
var plainFact = new PgpObjectFactory(clear);
var message = plainFact.NextPgpObject();
var outData = new GPGDecryptedDataReturn {
FingerPrint = lastFingerPrint,
};
if (message is PgpCompressedData cData)
{
var pgpFact = new PgpObjectFactory(cData.GetDataStream());
message = pgpFact.NextPgpObject();
}
if (message is PgpLiteralData ld)
{
outData.Filename = ld.FileName;
var iss = ld.GetInputStream();
byte[] buffer = new byte[16 * 1024];
using (var ms = new MemoryStream()) {
int read;
while ((read = iss.Read(buffer, 0, buffer.Length)) > 0)
{
ms.Write(buffer, 0, read);
}
outData.Base64Data = Convert.ToBase64String(ms.ToArray());
}
}
else if (message is PgpOnePassSignatureList)
{
throw new PgpException("Encrypted message contains a signed message - not literal data.");
}
else
{
throw new PgpException("Message is not a simple encrypted file - type unknown.");
}
outData.IsIntegrityProtected = pbe.IsIntegrityProtected();
if (outData.IsIntegrityProtected)
{
outData.IsIntegrityOK = pbe.Verify();
}
return(outData);
}
}
public static GPGDecryptedDataReturn DecryptStream(Stream stream, PgpPrivateKey key)
{
var pgpF = new PgpObjectFactory(stream);
var o = pgpF.NextPgpObject();
var enc = o as PgpEncryptedDataList;
if (enc == null)
{
enc = (PgpEncryptedDataList)pgpF.NextPgpObject();
}
PgpPublicKeyEncryptedData pbe = null;
string lastFingerPrint = "None";
foreach (PgpPublicKeyEncryptedData pked in enc.GetEncryptedDataObjects())
{
if (pked.KeyId == key.KeyId)
{
pbe = pked;
break;
}
}
if (pbe == null)
{
throw new NoKeyAvailableException("There is no payload that matches loaded key.");
}
var clear = pbe.GetDataStream(key);
var plainFact = new PgpObjectFactory(clear);
var message = plainFact.NextPgpObject();
var outData = new GPGDecryptedDataReturn {
FingerPrint = lastFingerPrint,
};
if (message is PgpCompressedData cData)
{
var pgpFact = new PgpObjectFactory(cData.GetDataStream());
message = pgpFact.NextPgpObject();
}
if (message is PgpLiteralData ld)
{
outData.Filename = ld.FileName;
var iss = ld.GetInputStream();
byte[] buffer = new byte[16 * 1024];
using (var ms = new MemoryStream()) {
int read;
while ((read = iss.Read(buffer, 0, buffer.Length)) > 0)
{
ms.Write(buffer, 0, read);
}
outData.Base64Data = Convert.ToBase64String(ms.ToArray());
}
}
else if (message is PgpOnePassSignatureList)
{
throw new PgpException("Encrypted message contains a signed message - not literal data.");
}
else
{
throw new PgpException("Message is not a simple encrypted file - type unknown.");
}
outData.IsIntegrityProtected = pbe.IsIntegrityProtected();
if (outData.IsIntegrityProtected)
{
outData.IsIntegrityOK = pbe.Verify();
}
return(outData);
}
