Java Code Examples for org.bouncycastle.crypto.generators.RSAKeyPairGenerator#init()

private KeyPair createKeyPair() throws InvalidKeySpecException, NoSuchAlgorithmException {

        final RSAKeyPairGenerator gen = new RSAKeyPairGenerator();

        gen.init(new RSAKeyGenerationParameters(BigInteger.valueOf(3), new SecureRandom(), 1024, 80));
        final AsymmetricCipherKeyPair keypair = gen.generateKeyPair();

        final RSAKeyParameters publicKey = (RSAKeyParameters) keypair.getPublic();
        final RSAPrivateCrtKeyParameters privateKey = (RSAPrivateCrtKeyParameters) keypair.getPrivate();

        final PublicKey pubKey = KeyFactory.getInstance("RSA").generatePublic(
                new RSAPublicKeySpec(publicKey.getModulus(), publicKey.getExponent()));

        final PrivateKey privKey = KeyFactory.getInstance("RSA").generatePrivate(
                new RSAPrivateCrtKeySpec(publicKey.getModulus(), publicKey.getExponent(),
                        privateKey.getExponent(), privateKey.getP(), privateKey.getQ(),
                        privateKey.getDP(), privateKey.getDQ(), privateKey.getQInv()));

        return new KeyPair(pubKey, privKey);
    }
 

@Override
public KeyPair rsaGenerate() {
	RSAKeyPairGenerator keyGen = new RSAKeyPairGenerator();
	keyGen.init(new RSAKeyGenerationParameters(E, new SecureRandom(), RSA_KEY_SIZE,
			PrimeCertaintyCalculator.getDefaultCertainty(RSA_KEY_SIZE)));
	AsymmetricCipherKeyPair pair = keyGen.generateKeyPair();

	RSAKeyParameters pub = (RSAKeyParameters) pair.getPublic();
	RSAPrivateCrtKeyParameters priv = (RSAPrivateCrtKeyParameters) pair.getPrivate();

	// As in BCRSAPrivateKey / BCRSAPublicKey
	AlgorithmIdentifier algo = new AlgorithmIdentifier(PKCSObjectIdentifiers.rsaEncryption, DERNull.INSTANCE);
	byte[] publicKey = KeyUtil.getEncodedSubjectPublicKeyInfo(algo, new RSAPublicKey(pub.getModulus(),
			pub.getExponent()));
	byte[] privateKey = KeyUtil.getEncodedPrivateKeyInfo(algo, new RSAPrivateKey(priv.getModulus(),
			priv.getPublicExponent(), priv.getExponent(), priv.getP(), priv.getQ(), priv.getDP(), priv.getDQ(),
			priv.getQInv()));

	return new KeyPair(privateKey, publicKey);
}
 

public static AsymmetricCipherKeyPair generateRsaKeyPair(int keyStrength) throws Exception {
	Security.addProvider(new BouncyCastleProvider());

	try {
		RSAKeyPairGenerator generator = new RSAKeyPairGenerator();
		generator.init(new RSAKeyGenerationParameters(RSAKeyGenParameterSpec.F4, SecureRandom.getInstance("SHA1PRNG"), keyStrength, 80));
		AsymmetricCipherKeyPair keyPair = generator.generateKeyPair();
		return keyPair;
	} catch (Exception e) {
		throw new Exception("Cannot create RSA keypair", e);
	}
}
 

@Test
@Ignore
public void testPureLightweightBouncyCastle() throws IOException, InvalidKeyException, IllegalBlockSizeException,
		BadPaddingException, DataLengthException, IllegalStateException, InvalidCipherTextException,
		NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException, InvalidAlgorithmParameterException {

	long startTime = System.currentTimeMillis();

	Security.addProvider(new BouncyCastleProvider());

	// generate RSA keys
	RSAKeyPairGenerator gen = new RSAKeyPairGenerator();
	gen.init(new RSAKeyGenerationParameters(new BigInteger("10001", 16), new SecureRandom(), 2048, 80));
	AsymmetricCipherKeyPair keyPair = gen.generateKeyPair();

	// some data where first entry is 0
	byte[] data = { 10, 122, 12, 127, 35, 58, 87, 56, -6, 73, 10, -13, -78, 4, -122, -61 };

	// encrypt data asymmetrically
	AsymmetricBlockCipher cipher = new RSAEngine();
	cipher = new PKCS1Encoding(cipher);
	cipher.init(true, keyPair.getPublic());
	byte[] rsaEncryptedData = cipher.processBlock(data, 0, data.length);

	Assert.assertFalse(Arrays.equals(data, rsaEncryptedData));

	// decrypt data asymmetrically
	cipher.init(false, keyPair.getPrivate());
	byte[] dataBack = cipher.processBlock(rsaEncryptedData, 0, rsaEncryptedData.length);

	assertTrue(Arrays.equals(data, dataBack));

	long stopTime = System.currentTimeMillis();
	long elapsedTime = stopTime - startTime;
	logger.debug("elapsed time = {}", elapsedTime);
}
 

private static PGPKeyRingGenerator generateKeyRingGenerator( String id, char[] pass, int s2kcount, int keySize,
                                                             KeyPair keyPair ) throws PGPException
{
    // This object generates individual key-pairs.
    RSAKeyPairGenerator kpg = new RSAKeyPairGenerator();

    // Boilerplate RSA parameters, no need to change anything
    // except for the RSA key-size (2048). You can use whatever
    // key-size makes sense for you -- 4096, etc.
    kpg.init( new RSAKeyGenerationParameters( BigInteger.valueOf( 0x10001 ), new SecureRandom(), keySize, 12 ) );

    // First create the master (signing) key with the generator.
    PGPKeyPair rsakp_sign = new BcPGPKeyPair( PGPPublicKey.RSA_GENERAL, kpg.generateKeyPair(), new Date() );
    // Then an encryption subkey.
    PGPKeyPair rsakp_enc = new BcPGPKeyPair( PGPPublicKey.RSA_GENERAL, kpg.generateKeyPair(), new Date() );

    keyPair.setPrimaryKeyId( Long.toHexString( rsakp_sign.getKeyID() ) );
    keyPair.setPrimaryKeyFingerprint( BytesToHex( rsakp_sign.getPublicKey().getFingerprint() ) );
    keyPair.setSubKeyId( Long.toHexString( rsakp_enc.getKeyID() ) );
    keyPair.setSubKeyFingerprint( BytesToHex( rsakp_enc.getPublicKey().getFingerprint() ) );

    // Add a self-signature on the id
    PGPSignatureSubpacketGenerator signhashgen = new PGPSignatureSubpacketGenerator();

    // Add signed metadata on the signature.
    // 1) Declare its purpose
    signhashgen.setKeyFlags( false, KeyFlags.SIGN_DATA | KeyFlags.CERTIFY_OTHER );
    // 2) Set preferences for secondary crypto algorithms to use
    //    when sending messages to this key.
    signhashgen.setPreferredSymmetricAlgorithms( false, new int[] {
            SymmetricKeyAlgorithmTags.AES_256, SymmetricKeyAlgorithmTags.AES_192, SymmetricKeyAlgorithmTags.AES_128,
            SymmetricKeyAlgorithmTags.CAST5, SymmetricKeyAlgorithmTags.TRIPLE_DES
    } );
    signhashgen.setPreferredHashAlgorithms( false, new int[] {
            HashAlgorithmTags.SHA256, HashAlgorithmTags.SHA1, HashAlgorithmTags.SHA384, HashAlgorithmTags.SHA512,
            HashAlgorithmTags.SHA224,
    } );
    signhashgen.setPreferredCompressionAlgorithms( false, new int[] {
            CompressionAlgorithmTags.ZLIB, CompressionAlgorithmTags.BZIP2, CompressionAlgorithmTags.ZIP
    } );
    // 3) Request senders add additional checksums to the
    //    message (useful when verifying unsigned messages.)
    signhashgen.setFeature( false, Features.FEATURE_MODIFICATION_DETECTION );

    // Create a signature on the encryption subkey.
    PGPSignatureSubpacketGenerator enchashgen = new PGPSignatureSubpacketGenerator();
    // Add metadata to declare its purpose
    enchashgen.setKeyFlags( false, KeyFlags.ENCRYPT_COMMS | KeyFlags.ENCRYPT_STORAGE );

    // Objects used to encrypt the secret key.
    PGPDigestCalculator sha1Calc = new BcPGPDigestCalculatorProvider().get( HashAlgorithmTags.SHA1 );

    // bcpg 1.48 exposes this API that includes s2kcount. Earlier
    // versions use a default of 0x60.
    PBESecretKeyEncryptor pske =
            ( new BcPBESecretKeyEncryptorBuilder( PGPEncryptedData.CAST5, sha1Calc, s2kcount ) ).build( pass );
    // Finally, create the keyring itself. The constructor
    // takes parameters that allow it to generate the self
    // signature.
    PGPKeyRingGenerator keyRingGen =
            new PGPKeyRingGenerator( PGPSignature.POSITIVE_CERTIFICATION, rsakp_sign, id, sha1Calc,
                    signhashgen.generate(), null,
                    new BcPGPContentSignerBuilder( rsakp_sign.getPublicKey().getAlgorithm(),
                            HashAlgorithmTags.SHA1 ), pske );

    // Add our encryption subkey, together with its signature.
    keyRingGen.addSubKey( rsakp_enc, enchashgen.generate(), null );
    return keyRingGen;
}
 

private static AsymmetricCipherKeyPair generateKeyPair(int rsaKeyBits) throws Exception {
  RSAKeyPairGenerator generator = new RSAKeyPairGenerator();
  generator.init(new RSAKeyGenerationParameters(SIGNING_EXPONENT, SECURE_RANDOM, rsaKeyBits, 12));
  return generator.generateKeyPair();
}
 

@Override
public Object apply(WarpScriptStack stack) throws WarpScriptException {
  Object top = stack.pop();

  if (!(top instanceof Long)) {
    throw new WarpScriptException(getName() + " expects a key length.");
  }

  int strength = ((Number) top).intValue();
  
  top = stack.pop();

  BigInteger exponent = new BigInteger(top.toString());
          
  RSAKeyPairGenerator gen = new RSAKeyPairGenerator();
  
  // For explanation of 'certainty', refer to http://bouncy-castle.1462172.n4.nabble.com/Questions-about-RSAKeyGenerationParameters-td1463186.html
  RSAKeyGenerationParameters params = new RSAKeyGenerationParameters(exponent, CryptoHelper.getSecureRandom(), strength, 64);
  
  gen.init(params);
  final AsymmetricCipherKeyPair keypair = gen.generateKeyPair();
      
  Map<String,String> keyparams = new HashMap<String,String>();
  
  keyparams.put(Constants.KEY_MODULUS, ((RSAKeyParameters) keypair.getPrivate()).getModulus().toString());
  keyparams.put(Constants.KEY_ALGORITHM, "RSA");
  keyparams.put(Constants.KEY_EXPONENT, ((RSAKeyParameters) keypair.getPrivate()).getExponent().toString());
  
  stack.push(keyparams);
  
  keyparams = new HashMap<String,String>();

  keyparams.put(Constants.KEY_MODULUS, ((RSAKeyParameters) keypair.getPublic()).getModulus().toString());
  keyparams.put(Constants.KEY_ALGORITHM, "RSA");
  keyparams.put(Constants.KEY_EXPONENT, ((RSAKeyParameters) keypair.getPublic()).getExponent().toString());

  stack.push(keyparams);

  return stack;
}