问题
I am tryng to decrypt a file I just encrypted using bouncycastle, but im getting this exception:
Premature end of stream in PartialInputStream
I am using the example code from bouncycastle and haven't changed anything.
I'm getting this when I use this code for encryption:
private static byte[] EncryptFile(byte[] clearData, string fileName, PgpPublicKey encKey, bool withIntegrityCheck)
{
MemoryStream encOut = new MemoryStream();
try
{
MemoryStream bOut = new MemoryStream();
PgpCompressedDataGenerator comData = new PgpCompressedDataGenerator( CompressionAlgorithmTag.Zip );
//PgpUtilities.WriteFileToLiteralData(
// comData.Open(bOut),
// PgpLiteralData.Binary,
// new FileInfo(fileName));
Stream cos = comData.Open(bOut);
PgpLiteralDataGenerator lData = new PgpLiteralDataGenerator();
Stream pOut = lData.Open(
cos,
PgpLiteralData.Binary,
fileName,
clearData.Length,
DateTime.UtcNow
);
lData.Close();
comData.Close();
PgpEncryptedDataGenerator cPk = new PgpEncryptedDataGenerator( SymmetricKeyAlgorithmTag.Cast5, withIntegrityCheck, new SecureRandom() );
cPk.AddMethod(encKey);
byte[] bytes = bOut.ToArray();
Stream os = encOut;
Stream cOut = cPk.Open(os, bytes.Length);
cOut.Write(bytes, 0, bytes.Length);
cOut.Close();
encOut.Close();
}
catch (PgpException e)
{
Console.Error.WriteLine(e);
Exception underlyingException = e.InnerException;
if (underlyingException != null)
{
Console.Error.WriteLine(underlyingException.Message);
Console.Error.WriteLine(underlyingException.StackTrace);
}
}
return encOut.ToArray();
}
I think it has something to do with the PgpLiteralDataGenerator
.
But I need to use it because I want to encrypt data from a byte array, not from a file. Is there some other way to do this?
回答1:
Anybody who is struggeling heres a working code:
using System;
using System.Xml;
using System.IO;
using System.Security.Cryptography;
using System.Security.Cryptography.Xml;
using System.Text;
using Org.BouncyCastle.Bcpg.OpenPgp;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.Utilities.IO;
using Org.BouncyCastle.Utilities.Encoders;
using Org.BouncyCastle.Bcpg;
class Program
{
private static PgpPublicKey ReadPublicKey(Stream inputStream)
{
inputStream = PgpUtilities.GetDecoderStream(inputStream);
PgpPublicKeyRingBundle pgpPub = new PgpPublicKeyRingBundle(inputStream);
//
// we just loop through the collection till we find a key suitable for encryption, in the real
// world you would probably want to be a bit smarter about this.
//
//
// iterate through the key rings.
//
foreach (PgpPublicKeyRing kRing in pgpPub.GetKeyRings())
{
foreach (PgpPublicKey k in kRing.GetPublicKeys())
{
if (k.IsEncryptionKey)
{
return k;
}
}
}
throw new ArgumentException("Can't find encryption key in key ring.");
}
private static byte[] EncryptFile(byte[] clearData, string fileName, PgpPublicKey encKey, bool withIntegrityCheck)
{
MemoryStream bOut = new MemoryStream();
PgpCompressedDataGenerator comData = new PgpCompressedDataGenerator(
CompressionAlgorithmTag.Zip);
Stream cos = comData.Open(bOut); // open it with the final destination
PgpLiteralDataGenerator lData = new PgpLiteralDataGenerator();
// we want to Generate compressed data. This might be a user option later,
// in which case we would pass in bOut.
Stream pOut = lData.Open(
cos, // the compressed output stream
PgpLiteralData.Binary,
fileName, // "filename" to store
clearData.Length, // length of clear data
DateTime.UtcNow // current time
);
pOut.Write(clearData, 0, clearData.Length);
lData.Close();
comData.Close();
PgpEncryptedDataGenerator cPk = new PgpEncryptedDataGenerator(SymmetricKeyAlgorithmTag.Cast5, new SecureRandom());
cPk.AddMethod(encKey);
byte[] bytes = bOut.ToArray();
MemoryStream encOut = new MemoryStream();
Stream os = encOut;
Stream cOut = cPk.Open(os, bytes.Length);
cOut.Write(bytes, 0, bytes.Length); // obtain the actual bytes from the compressed stream
cOut.Close();
encOut.Close();
return encOut.ToArray();
}
static void Main(string[] args)
{
try
{
byte[] dataBytes = File.ReadAllBytes("test.xml");
Stream keyIn = File.OpenRead("cert.asc");
Stream outStream = File.Create("data.bpg");
byte[] encrypted = EncryptFile(dataBytes, "data", ReadPublicKey(keyIn), false);
outStream.Write(encrypted, 0, encrypted.Length);
keyIn.Close();
outStream.Close();
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
Console.ReadLine();
}
}
回答2:
I got the same error, when I tried to read from the 'stream'.
PgpLiteralData ld = (PgpLiteralData)message;
var stream = ld.GetInputStream(); // the stream to read form
A solution for me was to copy the stream to a new .net Stream object
like MemoryStream
. And after that read from the memoryStream object.
So, my base stream type has nothing to do with Org.BouncyCastle.Bcpg
stream types.
来源:https://stackoverflow.com/questions/5660160/partialinputstream-during-bouncycastle-pgp-decryption