Android Open Source - amanaje R S A Key Pair Generator

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License

The source code is released under:

Apache License

Java Source Code

package org.jdamico.bc.openpgp.utils;
/*from   ww w. j  ava  2  s .c  o m*/
import java.io.IOException;
import java.io.OutputStream;
import java.security.InvalidKeyException;
import java.security.NoSuchProviderException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SignatureException;
import java.security.interfaces.RSAPrivateCrtKey;
import java.util.Date;

import org.spongycastle.bcpg.ArmoredOutputStream;
import org.spongycastle.bcpg.HashAlgorithmTags;
import org.spongycastle.bcpg.RSASecretBCPGKey;
import org.spongycastle.openpgp.PGPEncryptedData;
import org.spongycastle.openpgp.PGPException;
import org.spongycastle.openpgp.PGPKeyPair;
import org.spongycastle.openpgp.PGPPrivateKey;
import org.spongycastle.openpgp.PGPPublicKey;
import org.spongycastle.openpgp.PGPSecretKey;
import org.spongycastle.openpgp.PGPSignature;
import org.spongycastle.openpgp.operator.PGPDigestCalculator;
import org.spongycastle.openpgp.operator.jcajce.JcaPGPContentSignerBuilder;
import org.spongycastle.openpgp.operator.jcajce.JcaPGPDigestCalculatorProviderBuilder;
import org.spongycastle.openpgp.operator.jcajce.JcaPGPKeyConverter;
import org.spongycastle.openpgp.operator.jcajce.JcePBESecretKeyEncryptorBuilder;

/**
 * A simple utility class that generates a RSA PGPPublicKey/PGPSecretKey pair.
 * <p>
 * usage: RSAKeyPairGenerator [-a] identity passPhrase
 * <p>
 * Where identity is the name to be associated with the public key. The keys are placed 
 * in the files pub.[asc|bpg] and secret.[asc|bpg].
 */
public class RSAKeyPairGenerator
{
    public void exportKeyPair(
        OutputStream    secretOut,
        OutputStream    publicOut,
        PublicKey       publicKey,
        PrivateKey      privateKey,
        String          identity,
        char[]          passPhrase,
        boolean         armor)
        throws IOException, InvalidKeyException, NoSuchProviderException, SignatureException, PGPException
    {    
        if (armor)
        {
            secretOut = new ArmoredOutputStream(secretOut);
        }
        
        
        PGPPublicKey a = (new JcaPGPKeyConverter().getPGPPublicKey(PGPPublicKey.RSA_GENERAL, publicKey, new Date()));
        RSAPrivateCrtKey rsK = (RSAPrivateCrtKey)privateKey;
        RSASecretBCPGKey privPk = new RSASecretBCPGKey(rsK.getPrivateExponent(), rsK.getPrimeP(), rsK.getPrimeQ());
        PGPPrivateKey b = new PGPPrivateKey(a.getKeyID(), a.getPublicKeyPacket(), privPk);

        PGPDigestCalculator sha1Calc = new JcaPGPDigestCalculatorProviderBuilder().build().get(HashAlgorithmTags.SHA1);
        PGPKeyPair          keyPair = new PGPKeyPair(a,b);
        PGPSecretKey        secretKey = new PGPSecretKey(PGPSignature.DEFAULT_CERTIFICATION, keyPair, identity, sha1Calc, null, null, new JcaPGPContentSignerBuilder(keyPair.getPublicKey().getAlgorithm(), HashAlgorithmTags.SHA1), new JcePBESecretKeyEncryptorBuilder(PGPEncryptedData.CAST5, sha1Calc).setProvider("SC").build(passPhrase));
        
        secretKey.encode(secretOut);
        
        secretOut.close();
        
        if (armor)
        {
            publicOut = new ArmoredOutputStream(publicOut);
        }

        PGPPublicKey    key = secretKey.getPublicKey();
        
        key.encode(publicOut);
        
        publicOut.close();
    }
    
    
}

Java Source Code List

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