com.zwitserloot.ivyplusplus.mavencentral.CreateDetachedSignatures_.java Source code

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Here is the source code for com.zwitserloot.ivyplusplus.mavencentral.CreateDetachedSignatures_.java

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/**
 * Copyright  2011 Reinier Zwitserloot.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.zwitserloot.ivyplusplus.mavencentral;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.SignatureException;
import java.util.Iterator;

import lombok.Cleanup;

import org.bouncycastle.bcpg.ArmoredOutputStream;
import org.bouncycastle.bcpg.BCPGOutputStream;
import org.bouncycastle.openpgp.PGPException;
import org.bouncycastle.openpgp.PGPPrivateKey;
import org.bouncycastle.openpgp.PGPSecretKey;
import org.bouncycastle.openpgp.PGPSecretKeyRing;
import org.bouncycastle.openpgp.PGPSecretKeyRingCollection;
import org.bouncycastle.openpgp.PGPSignature;
import org.bouncycastle.openpgp.PGPSignatureGenerator;
import org.bouncycastle.openpgp.PGPUtil;

public class CreateDetachedSignatures_ {
    public void signFile(File file, File keyFile, String passphrase) throws IOException, SigningException {
        try {
            PGPSecretKey key;
            {
                @Cleanup
                FileInputStream keyIn = new FileInputStream(keyFile);
                key = getSigningKey(keyIn, keyFile.getName());
            }

            {
                @Cleanup
                OutputStream outStream = new FileOutputStream(file.getAbsolutePath() + ".asc");
                @Cleanup
                InputStream fileIn = new FileInputStream(file);
                signFile(fileIn, key, passphrase, outStream);
            }
        } catch (NoSuchProviderException e) {
            throw new SigningException("Bouncycastle provider not loaded", e);
        } catch (NoSuchAlgorithmException e) {
            throw new SigningException("Signature key uses an algorithm that is not compatible with ivyplusplus",
                    e);
        } catch (PGPException e) {
            throw new SigningException("Unknown signing problem: " + e.getMessage(), e);
        } catch (SignatureException e) {
            throw new SigningException("Problem with signature: " + e.getMessage(), e);
        }
    }

    public void signFile(InputStream dataIn, OutputStream signOut, File keyFile, String passphrase)
            throws IOException, SigningException {
        try {
            PGPSecretKey key;
            {
                @Cleanup
                FileInputStream keyIn = new FileInputStream(keyFile);
                key = getSigningKey(keyIn, keyFile.getName());
            }

            {
                signFile(dataIn, key, passphrase, signOut);
            }
        } catch (NoSuchProviderException e) {
            throw new SigningException("Bouncycastle provider not loaded", e);
        } catch (NoSuchAlgorithmException e) {
            throw new SigningException("Signature key uses an algorithm that is not compatible with ivyplusplus",
                    e);
        } catch (PGPException e) {
            throw new SigningException("Unknown signing problem: " + e.getMessage(), e);
        } catch (SignatureException e) {
            throw new SigningException("Problem with signature: " + e.getMessage(), e);
        }
    }

    void signFile(InputStream fileData, PGPSecretKey signingKey, String passphrase, OutputStream out)
            throws IOException, NoSuchProviderException, PGPException, NoSuchAlgorithmException,
            SignatureException {
        PGPPrivateKey privKey = signingKey.extractPrivateKey(passphrase.toCharArray(), "BC");
        PGPSignatureGenerator sigGen = new PGPSignatureGenerator(signingKey.getPublicKey().getAlgorithm(),
                PGPUtil.SHA1, "BC");
        sigGen.initSign(PGPSignature.BINARY_DOCUMENT, privKey);
        out = new ArmoredOutputStream(out);
        BCPGOutputStream bOut = new BCPGOutputStream(out);
        byte[] b = new byte[4096];
        while (true) {
            int r = fileData.read(b);
            if (r == -1)
                break;
            sigGen.update(b, 0, r);
        }

        sigGen.generate().encode(bOut);
        bOut.close();
        out.close();
    }

    PGPSecretKey getSigningKey(InputStream keyData, String streamName)
            throws IOException, PGPException, SigningException {
        PGPSecretKeyRingCollection keyrings_ = new PGPSecretKeyRingCollection(PGPUtil.getDecoderStream(keyData));
        Iterator<?> keyrings = keyrings_.getKeyRings();
        while (keyrings.hasNext()) {
            PGPSecretKeyRing keys_ = (PGPSecretKeyRing) keyrings.next();
            Iterator<?> keys = keys_.getSecretKeys();
            while (keys.hasNext()) {
                PGPSecretKey key = (PGPSecretKey) keys.next();
                if (key.isSigningKey())
                    return key;
            }
        }

        throw new SigningException("No signing key found in keyring: " + streamName);
    }
}