Example usage for org.bouncycastle.crypto.digests SHA256Digest SHA256Digest

Introduction

In this page you can find the example usage for org.bouncycastle.crypto.digests SHA256Digest SHA256Digest.

Prototype

public SHA256Digest()

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Standard constructor

Usage

From source file:secret.sharing.Encryptor.java

License:Open Source License

/**
 * Initiate the HMAC generator/*w ww . j  av a  2s.c o m*/
 * @param passphrase string used for encryption / decryption and authentification
 * @param hmacSalt salt for HMAC key
 */
private void initHMAC(String passphrase, byte[] hmacSalt)
        throws NoSuchAlgorithmException, InvalidKeySpecException {
    byte[] hmacKey = deriveKey(passphrase, hmacSalt, mHMACKeySize);
    mHmac = new HMac(new SHA256Digest());
    mHmac.init(new KeyParameter(hmacKey));
    mHMAC = null;
}

From source file:us.eharning.atomun.core.ec.internal.BouncyCastleECKeyPair.java

License:Apache License

/**
 * Perform an ECDSA signature using the private key.
 *
 * @param hash//  w  w w . jav  a  2 s .  c om
 *         byte array to sign.
 *
 * @return ASN.1 representation of the signature.
 */
@Nonnull
@Override
public byte[] sign(@Nonnull byte[] hash) {
    /* The HMacDSAKCalculator is what makes this signer RFC 6979 compliant. */
    ECDSASigner signer = new ECDSASigner(new RFC6979KCalculator(new SHA256Digest()));
    signer.init(true, new ECPrivateKeyParameters(privateExponent, domain));
    BigInteger[] signature = signer.generateSignature(hash);
    ByteArrayOutputStream stream = new ByteArrayOutputStream();
    /* Need to canonicalize signature up front ... */
    if (CANONICALIZE && signature[1].compareTo(HALF_CURVE_ORDER) > 0) {
        /* BOP does not do this */
        signature[1] = curve.getN().subtract(signature[1]);
    }
    try {
        DERSequenceGenerator seq = new DERSequenceGenerator(stream);
        seq.addObject(new ASN1Integer(signature[0]));
        seq.addObject(new ASN1Integer(signature[1]));
        seq.close();
        return stream.toByteArray();
    } catch (IOException e) {
        throw new IllegalStateException("IOException should not be thrown", e);
    }
}