Examples with ECPrivateKeySpec org.bouncycastle.jce.spec.ECPrivateKeySpec used on opensource projects

Example 6 with ECPrivateKeySpec

use of org.bouncycastle.jce.spec.ECPrivateKeySpec in project habot by ghys.

the class Utils method loadPrivateKey.

/**
 * Load the private key from a URL-safe base64 encoded string
 *
 * @param encodedPrivateKey
 * @return
 * @throws NoSuchProviderException
 * @throws NoSuchAlgorithmException
 * @throws InvalidKeySpecException
 */
public static PrivateKey loadPrivateKey(String encodedPrivateKey) throws NoSuchProviderException, NoSuchAlgorithmException, InvalidKeySpecException {
    byte[] decodedPrivateKey = base64Decode(encodedPrivateKey);
    BigInteger s = BigIntegers.fromUnsignedByteArray(decodedPrivateKey);
    ECNamedCurveParameterSpec parameterSpec = ECNamedCurveTable.getParameterSpec(CURVE);
    ECPrivateKeySpec privateKeySpec = new ECPrivateKeySpec(s, parameterSpec);
    KeyFactory keyFactory = KeyFactory.getInstance(ALGORITHM, PROVIDER_NAME);
    return keyFactory.generatePrivate(privateKeySpec);
}