I'm trying to encrypt files using my private key (in ascii format) and any other public key (also in ascii format). The BouncyCastle library looks like the correct thing to use, but I cannot find documentation for C#. Could anyone please assist me with an example. Thank you.
At a basic level, PGP encryption uses a combination of two forms of encryption: symmetric key encryption, and public-key encryption.
PGP uses the public key system in which every user has a unique encryption key known publicly and a private key that only they know. A message is encrypted when a user sends it to someone using their public key, then decrypted when the recipient opens it with their private key.
Here's some code from the BouncyCastle example. You should grab the source code and look in the unit tests, they contain examples. I've found that Java resources are also useful. The example can be found in the source under crypto\test\src\openpgp\examples\PbeFileProcessor.cs
private static void EncryptFile(
Stream outputStream,
string fileName,
char[] passPhrase,
bool armor,
bool withIntegrityCheck)
{
if (armor)
{
outputStream = new ArmoredOutputStream(outputStream);
}
MemoryStream bOut = new MemoryStream();
PgpCompressedDataGenerator comData = new PgpCompressedDataGenerator(
CompressionAlgorithmTag.Zip);
PgpUtilities.WriteFileToLiteralData(
comData.Open(bOut),
PgpLiteralData.Binary,
new FileInfo(fileName));
comData.Close();
byte[] bytes = bOut.ToArray();
PgpEncryptedDataGenerator cPk = new PgpEncryptedDataGenerator(
SymmetricKeyAlgorithmTag.Cast5, withIntegrityCheck, new SecureRandom());
cPk.AddMethod(passPhrase);
Stream cOut = cPk.Open(outputStream, bytes.Length);
cOut.Write(bytes, 0, bytes.Length);
cOut.Close();
if (armor)
{
outputStream.Close();
}
}
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With