I have a problem reading the decrypted messages and the decryptStream.read()
doesn't return me any bytes. See the code below that I used to encrypt data. I
am writing data to file using the encryptStream returned by the following
method.
On the other hand when I write the content to the file with in the following
method and later close all streams I can successfully decrypt the files. Has
anyone used streaming with gpg using RSA successfully. If so, can any one share
the information on how to do it.
I created a key using RSA with 1024 bytes using gpg --gen-key and used addkey
to add the sub key. I am using Bouncy Castle DataGenerators, Input and
outputStreams to stream the output from program and writing the encrypted
content to files. However the only way I could successfully decrypt files was
when I open, write and close compression, encryption and literal streams in the
same method. But for my needs I would like to return a encrypted stream and let
that stream be used for writing various data to files.
protected OutputStream encryptStream (String pPlainFilePath, boolean pAppend)
throws IOException
{
//PGP Encryption Data Generator
PGPEncryptedDataGenerator encryptedDataGen = null;
//PGP Literal Data Generator
PGPLiteralDataGenerator literalDataGen = null;
//PGP Compressed Data Generator
PGPCompressedDataGenerator compressedDataGen = null;
//The outputstream associates with different data generator for encryption,
compression and writing literal data.
OutputStream encryptStream = null;
OutputStream compressStream = null;
OutputStream literalStream = null;
//EncryptionDataGenerator opens this stream to create the encrypt stream.
OutputStream outputStream = null;
try
{
//PGPEncryption using SymmetricKey Algorithm CAST5 (128 bit key, as per
RFC 2144), Configred Message IntegrityCheck, Random Number Genarator Algorithm
SHA1PRNG with Bouncy Castle provider
encryptedDataGen = new
PGPEncryptedDataGenerator(getEncryptionAlgorithm(), isMessageIntegrityCheck(),
SecureRandom.getInstance(getRNGAlgorithm()), PROVIDER_NAME);
//Add a public key encrypted session key to the encrypted object
encryptedDataGen.addMethod(getPublicKey());
String pEncFilePath = null;
if ( isAsciiOutput() )
{
pEncFilePath = pPlainFilePath + ".asc";
}
else
{
pEncFilePath = pPlainFilePath + ".bpg";
}
//Create a FileOutputStream for the file
outputStream = new FileOutputStream(pEncFilePath, pAppend);
//Use ArmoredOutputStream with base64 encoding if it is Ascii
if ( isAsciiOutput() )
{
outputStream = new ArmoredOutputStream(outputStream);
}
//Use EncryptiedDataGenerator to open an output stream to write the
encrypted byes.
encryptStream = encryptedDataGen.open(outputStream, new byte[
BYTE_ARRAY_SIZE ] );
compressedDataGen = new
PGPCompressedDataGenerator(PGPCompressedData.BZIP2);
compressStream = compressedDataGen.open(encryptStream, new byte[
BYTE_ARRAY_SIZE ]);
literalDataGen = new PGPLiteralDataGenerator(true);
literalStream = literalDataGen.open(compressStream,
PGPLiteralData.BINARY, pEncFilePath, DateTools.getInstance().getSystemDate(),
new byte[BYTE_ARRAY_SIZE]);
}
catch (PGPException e)
{
sLOGGER.error(e.getMessage(), e);
if (e.getUnderlyingException() != null)
{
sLOGGER.error(e.getUnderlyingException());
}
}
catch (NoSuchProviderException e)
{
sLOGGER.error("No Such Provider named BC [BouncyCastle]" +
e.getMessage(), e);
}
catch (NoSuchAlgorithmException e)
{
sLOGGER.error("No Such Algorithm [" + getRNGAlgorithm() + "]" +
e.getMessage(), e);
}
finally
{
/*literalDataGen.close();
literalStream.close(); */
compressedDataGen.close();
compressStream.close();
encryptedDataGen.close();
encryptStream.close();
}
return literalStream;
//Encrypted and compressed outputstream
}
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