java.security.spec.ECPrivateKeySpec Java Examples

The following examples show how to use java.security.spec.ECPrivateKeySpec. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.

Example #1

Source File: SoftKeymasterBlob.java From keystore-decryptor with Apache License 2.0

7 votes

private static ECPrivateKey toJcaPrivateKey(org.bouncycastle.asn1.sec.ECPrivateKey ecPrivateKey)
        throws GeneralSecurityException {
    String curveName = null;
    ASN1ObjectIdentifier curveId = (ASN1ObjectIdentifier) ecPrivateKey.getParameters();
    if (curveId.equals(secp224r1_OID)) {
        curveName = "secp224r1";
    } else if (curveId.equals(prime256v1_OID)) {
        curveName = "prime256v1";
    } else if (curveId.equals(secp384r1_OID)) {
        curveName = "secp384r1";
    } else if (curveId.equals(secp521r1_OID)) {
        curveName = "secp521r1";
    } else {
        throw new IllegalStateException("Unknown curve OID: " + curveId);
    }

    ECNamedCurveParameterSpec sp = ECNamedCurveTable.getParameterSpec(curveName);
    ECParameterSpec params = new ECNamedCurveSpec(sp.getName(), sp.getCurve(), sp.getG(),
            sp.getN(), sp.getH());

    ECPrivateKeySpec pkSpec = new ECPrivateKeySpec(ecPrivateKey.getKey(), params);
    KeyFactory kf = KeyFactory.getInstance("EC");
    ECPrivateKey privateKey = (ECPrivateKey) kf.generatePrivate(pkSpec);

    return privateKey;
}

Example #2

Source File: BCECGOST3410PrivateKey.java From ripple-lib-java with ISC License

6 votes

public BCECGOST3410PrivateKey(
    org.ripple.bouncycastle.jce.spec.ECPrivateKeySpec spec)
{
    this.d = spec.getD();

    if (spec.getParams() != null) // can be null if implicitlyCA
    {
        ECCurve curve = spec.getParams().getCurve();
        EllipticCurve ellipticCurve;

        ellipticCurve = EC5Util.convertCurve(curve, spec.getParams().getSeed());

        this.ecSpec = EC5Util.convertSpec(ellipticCurve, spec.getParams());
    }
    else
    {
        this.ecSpec = null;
    }
}

Example #3

Source File: JCEECPrivateKey.java From RipplePower with Apache License 2.0

6 votes

public JCEECPrivateKey(
    String              algorithm,
    org.ripple.bouncycastle.jce.spec.ECPrivateKeySpec     spec)
{
    this.algorithm = algorithm;
    this.d = spec.getD();

    if (spec.getParams() != null) // can be null if implicitlyCA
    {
        ECCurve curve = spec.getParams().getCurve();
        EllipticCurve ellipticCurve;

        ellipticCurve = EC5Util.convertCurve(curve, spec.getParams().getSeed());

        this.ecSpec = EC5Util.convertSpec(ellipticCurve, spec.getParams());
    }
    else
    {
        this.ecSpec = null;
    }
}

Example #4

Source File: BCDSTU4145PrivateKey.java From RipplePower with Apache License 2.0

6 votes

public BCDSTU4145PrivateKey(
    org.ripple.bouncycastle.jce.spec.ECPrivateKeySpec spec)
{
    this.d = spec.getD();

    if (spec.getParams() != null) // can be null if implicitlyCA
    {
        ECCurve curve = spec.getParams().getCurve();
        EllipticCurve ellipticCurve;

        ellipticCurve = EC5Util.convertCurve(curve, spec.getParams().getSeed());

        this.ecSpec = EC5Util.convertSpec(ellipticCurve, spec.getParams());
    }
    else
    {
        this.ecSpec = null;
    }
}

Example #5

Source File: GenerationTests.java From jdk8u_jdk with GNU General Public License v2.0

6 votes

private static PrivateKey getECPrivateKey(String curve) throws Exception {
    String s;
    ECParameterSpec params;
    switch (curve) {
        case "P256":
            s = EC_P256_S;
            params = EC_P256_PARAMS;
            break;
        case "P384":
            s = EC_P384_S;
            params = EC_P384_PARAMS;
            break;
        case "P521":
            s = EC_P521_S;
            params = EC_P521_PARAMS;
            break;
        default:
            throw new Exception("Unsupported curve: " + curve);
    }
    KeyFactory kf = KeyFactory.getInstance("EC");
    KeySpec kspec = new ECPrivateKeySpec(new BigInteger(s), params);
    return kf.generatePrivate(kspec);
}

Example #6

Source File: BCECPrivateKey.java From RipplePower with Apache License 2.0

6 votes

public BCECPrivateKey(
    String algorithm,
    org.ripple.bouncycastle.jce.spec.ECPrivateKeySpec spec,
    ProviderConfiguration configuration)
{
    this.algorithm = algorithm;
    this.d = spec.getD();

    if (spec.getParams() != null) // can be null if implicitlyCA
    {
        ECCurve curve = spec.getParams().getCurve();
        EllipticCurve ellipticCurve;

        ellipticCurve = EC5Util.convertCurve(curve, spec.getParams().getSeed());

        this.ecSpec = EC5Util.convertSpec(ellipticCurve, spec.getParams());
    }
    else
    {
        this.ecSpec = null;
    }

    this.configuration = configuration;
}

Example #7

Source File: GenerationTests.java From openjdk-jdk9 with GNU General Public License v2.0

6 votes

private static PrivateKey getECPrivateKey(String curve) throws Exception {
    String s;
    ECParameterSpec params;
    switch (curve) {
        case "P256":
            s = EC_P256_S;
            params = EC_P256_PARAMS;
            break;
        case "P384":
            s = EC_P384_S;
            params = EC_P384_PARAMS;
            break;
        case "P521":
            s = EC_P521_S;
            params = EC_P521_PARAMS;
            break;
        default:
            throw new Exception("Unsupported curve: " + curve);
    }
    KeyFactory kf = KeyFactory.getInstance("EC");
    KeySpec kspec = new ECPrivateKeySpec(new BigInteger(s), params);
    return kf.generatePrivate(kspec);
}

Example #8

Source File: BCECGOST3410PrivateKey.java From RipplePower with Apache License 2.0

6 votes

public BCECGOST3410PrivateKey(
    org.ripple.bouncycastle.jce.spec.ECPrivateKeySpec spec)
{
    this.d = spec.getD();

    if (spec.getParams() != null) // can be null if implicitlyCA
    {
        ECCurve curve = spec.getParams().getCurve();
        EllipticCurve ellipticCurve;

        ellipticCurve = EC5Util.convertCurve(curve, spec.getParams().getSeed());

        this.ecSpec = EC5Util.convertSpec(ellipticCurve, spec.getParams());
    }
    else
    {
        this.ecSpec = null;
    }
}

Example #9

Source File: JCEECPrivateKey.java From ripple-lib-java with ISC License

6 votes

public JCEECPrivateKey(
    String              algorithm,
    org.ripple.bouncycastle.jce.spec.ECPrivateKeySpec     spec)
{
    this.algorithm = algorithm;
    this.d = spec.getD();

    if (spec.getParams() != null) // can be null if implicitlyCA
    {
        ECCurve curve = spec.getParams().getCurve();
        EllipticCurve ellipticCurve;

        ellipticCurve = EC5Util.convertCurve(curve, spec.getParams().getSeed());

        this.ecSpec = EC5Util.convertSpec(ellipticCurve, spec.getParams());
    }
    else
    {
        this.ecSpec = null;
    }
}

Example #10

Source File: SecurityUtils.java From RISE-V2G with MIT License

6 votes

/**
 * Returns the ECPrivateKey instance from its raw bytes. Note that you must provide the "s" value of the 
 * private key, not e.g. the byte array from reading a PKCS#8 key file.
 * 
 * @param privateKeyBytes The byte array (the "s" value) of the private key
 * @return The ECPrivateKey instance
 */
public static ECPrivateKey getPrivateKey(byte[] privateKeyBytes) {
	try {
		AlgorithmParameters parameters = AlgorithmParameters.getInstance("EC");
		parameters.init(new ECGenParameterSpec("secp256r1"));
		
		ECParameterSpec ecParameterSpec = parameters.getParameterSpec(ECParameterSpec.class);
		ECPrivateKeySpec ecPrivateKeySpec = new ECPrivateKeySpec(new BigInteger(privateKeyBytes), ecParameterSpec);
		
		ECPrivateKey privateKey = (ECPrivateKey) KeyFactory.getInstance("EC").generatePrivate(ecPrivateKeySpec);

		return privateKey;
	} catch (NoSuchAlgorithmException | InvalidKeySpecException | InvalidParameterSpecException e) {
		getLogger().error(e.getClass().getSimpleName() + " occurred when trying to get private key from raw bytes", e);
		return null;
	}
}

Example #11

Source File: GenerationTests.java From openjdk-jdk8u with GNU General Public License v2.0

6 votes

private static PrivateKey getECPrivateKey(String curve) throws Exception {
    String s;
    ECParameterSpec params;
    switch (curve) {
        case "P256":
            s = EC_P256_S;
            params = EC_P256_PARAMS;
            break;
        case "P384":
            s = EC_P384_S;
            params = EC_P384_PARAMS;
            break;
        case "P521":
            s = EC_P521_S;
            params = EC_P521_PARAMS;
            break;
        default:
            throw new Exception("Unsupported curve: " + curve);
    }
    KeyFactory kf = KeyFactory.getInstance("EC");
    KeySpec kspec = new ECPrivateKeySpec(new BigInteger(s), params);
    return kf.generatePrivate(kspec);
}

Example #12

Source File: BCDSTU4145PrivateKey.java From ripple-lib-java with ISC License

6 votes

public BCDSTU4145PrivateKey(
    org.ripple.bouncycastle.jce.spec.ECPrivateKeySpec spec)
{
    this.d = spec.getD();

    if (spec.getParams() != null) // can be null if implicitlyCA
    {
        ECCurve curve = spec.getParams().getCurve();
        EllipticCurve ellipticCurve;

        ellipticCurve = EC5Util.convertCurve(curve, spec.getParams().getSeed());

        this.ecSpec = EC5Util.convertSpec(ellipticCurve, spec.getParams());
    }
    else
    {
        this.ecSpec = null;
    }
}

Example #13

Source File: BCECPrivateKey.java From ripple-lib-java with ISC License

6 votes

public BCECPrivateKey(
    String algorithm,
    org.ripple.bouncycastle.jce.spec.ECPrivateKeySpec spec,
    ProviderConfiguration configuration)
{
    this.algorithm = algorithm;
    this.d = spec.getD();

    if (spec.getParams() != null) // can be null if implicitlyCA
    {
        ECCurve curve = spec.getParams().getCurve();
        EllipticCurve ellipticCurve;

        ellipticCurve = EC5Util.convertCurve(curve, spec.getParams().getSeed());

        this.ecSpec = EC5Util.convertSpec(ellipticCurve, spec.getParams());
    }
    else
    {
        this.ecSpec = null;
    }

    this.configuration = configuration;
}

Example #14

Source File: CryptoUtils.java From cxf with Apache License 2.0

5 votes

public static ECPrivateKey getECPrivateKey(String curve, byte[] privateKey) {
    try {
        ECParameterSpec params = getECParameterSpec(curve, true);
        ECPrivateKeySpec keySpec = new ECPrivateKeySpec(
                                       toBigInteger(privateKey), params);
        KeyFactory kf = KeyFactory.getInstance("EC");
        return (ECPrivateKey) kf.generatePrivate(keySpec);

    } catch (Exception ex) {
        throw new SecurityException(ex);
    }
}

Example #15

Source File: JCEECPrivateKey.java From ripple-lib-java with ISC License

5 votes

public JCEECPrivateKey(
    String              algorithm,
    ECPrivateKeySpec    spec)
{
    this.algorithm = algorithm;
    this.d = spec.getS();
    this.ecSpec = spec.getParams();
}

Example #16

Source File: BCECPrivateKey.java From RipplePower with Apache License 2.0

5 votes

public BCECPrivateKey(
    String algorithm,
    ECPrivateKeySpec spec,
    ProviderConfiguration configuration)
{
    this.algorithm = algorithm;
    this.d = spec.getS();
    this.ecSpec = spec.getParams();
    this.configuration = configuration;
}

Example #17

Source File: JCEECPrivateKey.java From RipplePower with Apache License 2.0

5 votes

public JCEECPrivateKey(
    String              algorithm,
    ECPrivateKeySpec    spec)
{
    this.algorithm = algorithm;
    this.d = spec.getS();
    this.ecSpec = spec.getParams();
}

Example #18

Source File: BCECPrivateKey.java From ripple-lib-java with ISC License

5 votes

public BCECPrivateKey(
    String algorithm,
    ECPrivateKeySpec spec,
    ProviderConfiguration configuration)
{
    this.algorithm = algorithm;
    this.d = spec.getS();
    this.ecSpec = spec.getParams();
    this.configuration = configuration;
}

Example #19

Source File: clientUtil.java From fido2 with GNU Lesser General Public License v2.1

5 votes

public static String decryptKeyHandle(String keyHandleWithIV) throws DecoderException, NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException, ShortBufferException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException, InvalidKeySpecException, SignatureException {

        //get secure element key to decrypt
        byte[] Seckeybytes = Hex.decodeHex(CSConstants.SECURE_ELEMENT_SECRET_KEY.toCharArray());
        SecretKeySpec sks = new SecretKeySpec(Seckeybytes, "AES");

        byte[] receivedkeyHandle = DatatypeConverter.parseBase64Binary(keyHandleWithIV);

        //get IV
        byte[] receivedIV = new byte[16];
        System.arraycopy(receivedkeyHandle, 0, receivedIV, 0, 16);

        //unwrap the key handle
        //get the wrapped key handle bytes
        byte[] wrappedKeyHandleBytes = new byte[receivedkeyHandle.length - receivedIV.length];
        System.arraycopy(receivedkeyHandle, receivedIV.length, wrappedKeyHandleBytes, 0, wrappedKeyHandleBytes.length);

        //unwrapping received key handle
        //decrypt
        Cipher cipher1 = Cipher.getInstance("AES/CBC/PKCS7Padding", "BCFIPS");
        IvParameterSpec ivspec = new IvParameterSpec(receivedIV);
        cipher1.init(Cipher.DECRYPT_MODE, sks, ivspec);

        byte[] receivedunwrappedKeyHandle = new byte[cipher1.getOutputSize(wrappedKeyHandleBytes.length)];
        int p = cipher1.update(wrappedKeyHandleBytes, 0, wrappedKeyHandleBytes.length, receivedunwrappedKeyHandle, 0);
        cipher1.doFinal(receivedunwrappedKeyHandle, p);

        //put decrypted key in a BCPrivate key object //to test
        String privateKey = keyHandleDecode(new String(receivedunwrappedKeyHandle, "UTF-8"), 0); //0 for key
        byte[] prk = Base64.decodeBase64(privateKey);

        //get private key into BC understandable form -- test working
        ECPrivateKeySpec ecpks = new ECPrivateKeySpec(new BigInteger(prk), null);
        KeyFactory kf = KeyFactory.getInstance("ECDSA", "BCFIPS");
        PrivateKey privatetest = kf.generatePrivate(ecpks);

        return new String(receivedunwrappedKeyHandle, "UTF-8");

    }

Example #20

Source File: KeyCodec.java From UAF with Apache License 2.0

5 votes

/**
 * Decode based on d - 32 byte integer
 *
 * @param privKey
 * @param curveName - Example secp256r1
 * @return
 * @throws InvalidKeySpecException
 * @throws NoSuchAlgorithmException
 * @throws NoSuchProviderException
 */
public static PrivateKey getPrivKeyFromCurve(byte[] privKey, String curveName) throws InvalidKeySpecException, NoSuchAlgorithmException, NoSuchProviderException {

    ECNamedCurveParameterSpec spec = ECNamedCurveTable.getParameterSpec(curveName);
    KeyFactory kf = KeyFactory.getInstance("ECDSA", new BouncyCastleProvider());
    ECNamedCurveSpec params = new ECNamedCurveSpec(curveName, spec.getCurve(), spec.getG(), spec.getN());
    ECPrivateKeySpec priKey = new ECPrivateKeySpec(
            new BigInteger(privKey), // d
            params);
    return kf.generatePrivate(priKey);
}

Example #21

Source File: clientUtilAuth.java From fido2 with GNU Lesser General Public License v2.1

5 votes

public static String signObject(String input, String privateKeyS) throws NoSuchAlgorithmException, NoSuchProviderException, InvalidKeyException, SignatureException, InvalidKeySpecException {

        ////put decrypted private key in a BCPrivate key object
        byte[] prk = Base64.decodeBase64(privateKeyS);

        //get private key into BC understandable form
        ECPrivateKeySpec ecpks = new ECPrivateKeySpec(new BigInteger(privateKeyS), null);
        KeyFactory kf = KeyFactory.getInstance("ECDSA", "BCFIPS");
        PrivateKey pvk = kf.generatePrivate(ecpks);

        //Base64 decode input
        byte[] inputbytes = Base64.decodeBase64(input);

        //sign
        Signature sig = Signature.getInstance("SHA256withECDSA", "BCFIPS");
        sig.initSign(pvk, new SecureRandom());
        sig.update(inputbytes);
        byte[] signedBytes = sig.sign();

//        //verify locally FIXME -- local verification is required // not sure how to get the public key
//        PublicKey pkey = userKeyPair.getPublic();
//        sig.initVerify(pkey);
//        sig.update(inputbytes);
//        if (sig.verify(signedBytes)) {
//            return Base64.encodeBase64String(signedBytes);
//        } else {
//            return null;
//        }
        return Base64.encodeBase64String(signedBytes);
    }

Example #22

Source File: Common.java From fido2 with GNU Lesser General Public License v2.1

5 votes

/**
 * Function to generate a PrivateKey object from a byte-array containing the
 * ECDSA private-key
 *
 * @param pvk String with Base64-encoded private key
 * @return PrivateKey
 * @throws NoSuchAlgorithmException
 * @throws NoSuchProviderException
 * @throws InvalidKeySpecException
 * @throws java.security.spec.InvalidParameterSpecException
 */
public static PrivateKey getUserPrivateKey(String pvk)
        throws NoSuchAlgorithmException, NoSuchProviderException,
        InvalidKeySpecException, InvalidParameterSpecException
{
    AlgorithmParameters parameters = AlgorithmParameters.getInstance("EC");
    parameters.init(new ECGenParameterSpec("secp256r1"));

    ECParameterSpec ecParameterSpec = parameters.getParameterSpec(ECParameterSpec.class);
    ECPrivateKeySpec ecPrivateKeySpec = new ECPrivateKeySpec(new BigInteger(1, Base64.getUrlDecoder().decode(pvk)), ecParameterSpec);

    return KeyFactory.getInstance("EC").generatePrivate(ecPrivateKeySpec);
}

Example #23

Source File: JsonWebKey.java From swim with Apache License 2.0

5 votes

public ECPrivateKey ecPrivateKey() {
  final ECParameterSpec params = ecParameterSpec(this.value.get("crv").stringValue());
  final BigInteger d = parseBase64UrlUInt(this.value.get("d").stringValue());
  try {
    final ECPrivateKeySpec keySpec = new ECPrivateKeySpec(d, params);
    final KeyFactory keyFactory = KeyFactory.getInstance("EC");
    return (ECPrivateKey) keyFactory.generatePrivate(keySpec);
  } catch (GeneralSecurityException cause) {
    throw new RuntimeException(cause);
  }
}

Example #24

Source File: ECCDecrypt.java From web3sdk with Apache License 2.0

5 votes

/**
 * create BCECPrivateKey from privateKey
 *
 * @param privateKey
 * @return
 */
private BCECPrivateKey createBCECPrivateKey(BigInteger privateKey) {
    // Handle secret key
    ECPrivateKeySpec secretKeySpec =
            new ECPrivateKeySpec(privateKey, ECCParams.ecNamedCurveSpec);
    BCECPrivateKey bcecPrivateKey =
            new BCECPrivateKey("ECDSA", secretKeySpec, BouncyCastleProvider.CONFIGURATION);
    return bcecPrivateKey;
}

Example #25

Source File: TestECDH2.java From openjdk-jdk9 with GNU General Public License v2.0

5 votes

private KeyPair genECKeyPair(String curvName, String privD, String pubX,
                             String pubY, Provider p) throws Exception {
    AlgorithmParameters params = AlgorithmParameters.getInstance("EC", p);
    params.init(new ECGenParameterSpec(curvName));
    ECParameterSpec ecParams = params.getParameterSpec(ECParameterSpec.class);
    ECPrivateKeySpec privKeySpec =
        new ECPrivateKeySpec(new BigInteger(privD, 16), ecParams);
    ECPublicKeySpec pubKeySpec =
        new ECPublicKeySpec(new ECPoint(new BigInteger(pubX, 16),
                                        new BigInteger(pubY, 16)),
                            ecParams);
    PrivateKey privKey = kf.generatePrivate(privKeySpec);
    PublicKey pubKey = kf.generatePublic(pubKeySpec);
    return new KeyPair(pubKey, privKey);
}

Example #26

Source File: TestKeyFactory.java From openjdk-jdk9 with GNU General Public License v2.0

5 votes

private static void testPrivate(KeyFactory kf, PrivateKey key) throws Exception {
    System.out.println("Testing private key...");
    PrivateKey key2 = (PrivateKey)kf.translateKey(key);
    KeySpec keySpec = kf.getKeySpec(key, ECPrivateKeySpec.class);
    PrivateKey key3 = kf.generatePrivate(keySpec);
    KeySpec pkcs8Spec = kf.getKeySpec(key, PKCS8EncodedKeySpec.class);
    PrivateKey key4 = kf.generatePrivate(pkcs8Spec);
    KeySpec pkcs8Spec2 = new PKCS8EncodedKeySpec(key.getEncoded());
    PrivateKey key5 = kf.generatePrivate(pkcs8Spec2);
    testKey(key, key);
    testKey(key, key2);
    testKey(key, key3);
    testKey(key, key4);
    testKey(key, key5);
}

Example #27

Source File: TestECDSA2.java From openjdk-jdk9 with GNU General Public License v2.0

5 votes

private KeyPair genECKeyPair(String curvName, String privD, String pubX,
        String pubY, Provider p) throws Exception {
    AlgorithmParameters params = AlgorithmParameters.getInstance("EC", p);
    params.init(new ECGenParameterSpec(curvName));
    ECParameterSpec ecParams = params.getParameterSpec(ECParameterSpec.class);
    ECPrivateKeySpec privKeySpec =
        new ECPrivateKeySpec(new BigInteger(privD, 16), ecParams);
    ECPublicKeySpec pubKeySpec =
        new ECPublicKeySpec(new ECPoint(new BigInteger(pubX, 16), new BigInteger(pubY, 16)),
                            ecParams);
    PrivateKey privKey = kf.generatePrivate(privKeySpec);
    PublicKey pubKey = kf.generatePublic(pubKeySpec);
    return new KeyPair(pubKey, privKey);
}

Example #28

Source File: ConstantPasswords.java From Android_Code_Arbiter with GNU Lesser General Public License v3.0

5 votes

public void bad10() throws Exception {
    BigInteger bigInteger = new BigInteger("12345", 5);
    new DSAPrivateKeySpec(bigInteger, null, null, null);
    new DSAPublicKeySpec(bigInteger, null, bigInteger, null); // report once
    new DHPrivateKeySpec(bigInteger, null, null);
    new DHPublicKeySpec(bigInteger, null, null);
    new ECPrivateKeySpec(bigInteger, null);
    new RSAPrivateKeySpec(bigInteger, null);
    new RSAMultiPrimePrivateCrtKeySpec(bigInteger, null, null, null, null, null, null, null, null);
    new RSAPrivateCrtKeySpec(bigInteger, null, null, null, null, null, null, null);
    new RSAPublicKeySpec(bigInteger, null);
    new DSAPublicKeyImpl(bigInteger, null, null, null);
}

Example #29

Source File: JsonWebKey.java From azure-keyvault-java with MIT License

5 votes

private static PrivateKey getECPrivateKey(byte[] d, ECParameterSpec curveSpec, Provider provider) {
    try {
        ECPrivateKeySpec priSpec = new ECPrivateKeySpec(new BigInteger(1, d), curveSpec);
        KeyFactory kf = provider != null ? KeyFactory.getInstance("EC", provider)
                : KeyFactory.getInstance("EC", "SunEC");
        return (ECPrivateKey) kf.generatePrivate(priSpec);
    } catch (GeneralSecurityException e) {
        throw new IllegalStateException(e);
    }
}

Example #30

Source File: KeyCodec.java From UAF with Apache License 2.0

5 votes

/**
 * Decode based on d - 32 byte integer
 * 
 * @param privKey
 * @param curveName
 *            - Example secp256r1
 * @return
 * @throws InvalidKeySpecException
 * @throws NoSuchAlgorithmException
 * @throws NoSuchProviderException
 */
public static PrivateKey getPrivKeyFromCurve(byte[] privKey,
		String curveName) throws InvalidKeySpecException,
		NoSuchAlgorithmException, NoSuchProviderException {

	ECNamedCurveParameterSpec spec = ECNamedCurveTable
			.getParameterSpec(curveName);
	KeyFactory kf = KeyFactory.getInstance("ECDSA",
			new BouncyCastleProvider());
	ECNamedCurveSpec params = new ECNamedCurveSpec(curveName,
			spec.getCurve(), spec.getG(), spec.getN());
	ECPrivateKeySpec priKey = new ECPrivateKeySpec(new BigInteger(privKey), // d
			params);
	return kf.generatePrivate(priKey);
}