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using System;
using System.Collections;
using System.IO;
using Org.BouncyCastle.Bcpg.OpenPgp;
namespace Org.BouncyCastle.Bcpg.OpenPgp.Examples
{
/**
* A simple utility class that creates seperate signatures for files and verifies them.
* <p>
* To sign a file: DetachedSignatureProcessor -s [-a] fileName secretKey passPhrase.<br/>
* If -a is specified the output file will be "ascii-armored".</p>
* <p>
* To decrypt: DetachedSignatureProcessor -v fileName signatureFile publicKeyFile.</p>
* <p>
* Note: this example will silently overwrite files.
* It also expects that a single pass phrase
* will have been used.</p>
*/
public sealed class DetachedSignatureProcessor
{
private DetachedSignatureProcessor()
{
}
private static void VerifySignature(
string fileName,
string inputFileName,
string keyFileName)
{
using (Stream input = File.OpenRead(inputFileName),
keyIn = File.OpenRead(keyFileName))
{
VerifySignature(fileName, input, keyIn);
}
}
/**
* verify the signature in in against the file fileName.
*/
private static void VerifySignature(
string fileName,
Stream inputStream,
Stream keyIn)
{
inputStream = PgpUtilities.GetDecoderStream(inputStream);
PgpObjectFactory pgpFact = new PgpObjectFactory(inputStream);
PgpSignatureList p3 = null;
PgpObject o = pgpFact.NextPgpObject();
if (o is PgpCompressedData)
{
PgpCompressedData c1 = (PgpCompressedData)o;
pgpFact = new PgpObjectFactory(c1.GetDataStream());
p3 = (PgpSignatureList)pgpFact.NextPgpObject();
}
else
{
p3 = (PgpSignatureList)o;
}
PgpPublicKeyRingBundle pgpPubRingCollection = new PgpPublicKeyRingBundle(
PgpUtilities.GetDecoderStream(keyIn));
Stream dIn = File.OpenRead(fileName);
PgpSignature sig = p3[0];
PgpPublicKey key = pgpPubRingCollection.GetPublicKey(sig.KeyId);
sig.InitVerify(key);
int ch;
while ((ch = dIn.ReadByte()) >= 0)
{
sig.Update((byte)ch);
}
dIn.Close();
if (sig.Verify())
{
Console.WriteLine("signature verified.");
}
else
{
Console.WriteLine("signature verification failed.");
}
}
private static void CreateSignature(
string inputFileName,
string keyFileName,
string outputFileName,
char[] pass,
bool armor)
{
using (Stream keyIn = File.OpenRead(keyFileName),
output = File.OpenRead(outputFileName))
{
CreateSignature(inputFileName, keyIn, output, pass, armor);
}
}
private static void CreateSignature(
string fileName,
Stream keyIn,
Stream outputStream,
char[] pass,
bool armor)
{
if (armor)
{
outputStream = new ArmoredOutputStream(outputStream);
}
PgpSecretKey pgpSec = PgpExampleUtilities.ReadSecretKey(keyIn);
PgpPrivateKey pgpPrivKey = pgpSec.ExtractPrivateKey(pass);
PgpSignatureGenerator sGen = new PgpSignatureGenerator(
pgpSec.PublicKey.Algorithm, HashAlgorithmTag.Sha1);
sGen.InitSign(PgpSignature.BinaryDocument, pgpPrivKey);
BcpgOutputStream bOut = new BcpgOutputStream(outputStream);
Stream fIn = File.OpenRead(fileName);
int ch;
while ((ch = fIn.ReadByte()) >= 0)
{
sGen.Update((byte)ch);
}
fIn.Close();
sGen.Generate().Encode(bOut);
if (armor)
{
outputStream.Close();
}
}
public static void Main(
string[] args)
{
if (args[0].Equals("-s"))
{
if (args[1].Equals("-a"))
{
CreateSignature(args[2], args[3], args[2] + ".asc", args[4].ToCharArray(), true);
}
else
{
CreateSignature(args[1], args[2], args[1] + ".bpg", args[3].ToCharArray(), false);
}
}
else if (args[0].Equals("-v"))
{
VerifySignature(args[1], args[2], args[3]);
}
else
{
Console.Error.WriteLine("usage: DetachedSignatureProcessor [-s [-a] file keyfile passPhrase]|[-v file sigFile keyFile]");
}
}
}
}
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