Example usage for org.bouncycastle.crypto.digests SHAKEDigest update

Introduction

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

Prototype

public void update(byte[] in, int inOff, int len) 

Source Link

Usage

From source file:net.java.otr4j.crypto.ed448.Shake256.java

License:LGPL

/**
 * SHAKE-256 hash function.//from  w  w w  . j a v a 2  s  .  com
 *
 * @param input      The input data for the hash function.
 * @param outputSize The output size of the digest.
 */
@Nonnull
static byte[] shake256(final byte[] input, final int outputSize) {
    requireAtLeast(0, outputSize);
    assert !allZeroBytes(
            input) : "Expected non-zero bytes for input. This may indicate that a critical bug is present, or it may be a false warning.";
    final SHAKEDigest digest = new SHAKEDigest(SHAKE_256_LENGTH_BITS);
    digest.update(input, 0, input.length);
    final byte[] result = new byte[outputSize];
    digest.doFinal(result, 0, outputSize);
    return result;
}

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From source file:net.java.otr4j.crypto.OtrCryptoEngine4.java

License:LGPL

/**
 * KDF_1 key derivation function.//  w  w  w  . j a  v a  2s.  co m
 * <p>
 * "KDF_1(usageID || values, output_size) = SHAKE-256("OTRv4" || usageID || values, size)"
 *
 * @param dst        The destination byte array, with 32 bytes available for KDF_1 result.
 * @param offset     The offset position to start writing to the destination byte array.
 * @param usageID    The usage ID to be mixed in with the input to KDF1.
 * @param input      The input data to KDF_1.
 * @param outputSize The size of the derivative output.
 */
private static void shake256(final byte[] dst, final int offset, final KDFUsage usageID, final int outputSize,
        final byte[]... input) {
    requireNonNull(dst);
    requireAtLeast(0, outputSize);
    final SHAKEDigest digest = new SHAKEDigest(SHAKE_256_LENGTH_BITS);
    digest.update(OTR4_PREFIX, 0, OTR4_PREFIX.length);
    digest.update(usageID.value);
    for (final byte[] entry : input) {
        assert !allZeroBytes(
                entry) : "Expected non-zero bytes for input. This may indicate that a critical bug is present, or it may be a false warning.";
        digest.update(entry, 0, entry.length);
    }
    digest.doFinal(dst, offset, outputSize);
}

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From source file:net.java.otr4j.crypto.OtrCryptoEngine4.java

License:LGPL

/**
 * Generate a new random value in Z_q.//from   w w w .ja  v a 2s .  c  om
 *
 * @param random SecureRandom instance
 * @return Returns a newly generated random value.
 */
public static Scalar generateRandomValueInZq(final SecureRandom random) {
    final byte[] value = randomBytes(random, new byte[SCALAR_LENGTH_BYTES]);
    final byte[] h = new byte[SCALAR_LENGTH_BYTES];
    final SHAKEDigest digest = new SHAKEDigest(SHAKE_256_LENGTH_BITS);
    digest.update(value, 0, value.length);
    digest.doFinal(h, 0, h.length);
    prune(h);
    return decodeScalar(h);
}

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From source file:net.java.otr4j.crypto.OtrCryptoEngine4.java

License:LGPL

/**
 * Derive additional extra symmetric keys from the extra symmetric key, that is used as basis.
 *
 * @param index   the index, i.e. the counter for which key is derived.
 * @param context the context value from the TLV payload. (first 4 bytes of the TLV payload)
 * @param baseKey the extra symmetric key, acquired through the Double Ratchet algorithm.
 * @return Returns the derived extra symmetric key.
 *//*  w  w  w  .j  a v  a 2s .c o  m*/
@Nonnull
public static byte[] deriveExtraSymmetricKey(final int index, final byte[] context, final byte[] baseKey) {
    final byte[] idx = { (byte) (index & 0xff), (byte) ((index >>> 8) & 0xff) };
    requireLengthExactly(EXTRA_SYMMETRIC_KEY_CONTEXT_LENGTH_BYTES, context);
    requireLengthExactly(EXTRA_SYMMETRIC_KEY_LENGTH_BYTES, baseKey);
    final byte[] instanceKey = new byte[EXTRA_SYMMETRIC_KEY_LENGTH_BYTES];
    final SHAKEDigest digest = new SHAKEDigest(SHAKE_256_LENGTH_BITS);
    digest.update(OTR4_PREFIX, 0, OTR4_PREFIX.length);
    digest.update(idx, 0, idx.length);
    digest.update(context, 0, context.length);
    digest.update(baseKey, 0, baseKey.length);
    digest.doFinal(instanceKey, 0, EXTRA_SYMMETRIC_KEY_LENGTH_BYTES);
    return instanceKey;
}

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From source file:org.hyperledger.fabric.sdk.security.CryptoPrimitives.java

License:Open Source License

/**
 * shake256 do shake256 hashing/*from w  w  w. j  ava 2  s  .c  om*/
 *
 * @param in        byte array to be hashed.
 * @param bitLength of the result.
 * @return
 */
public byte[] shake256(byte[] in, int bitLength) {

    if (bitLength % 8 != 0) {
        throw new IllegalArgumentException("bit length not modulo 8");

    }

    final int byteLen = bitLength / 8;

    SHAKEDigest sd = new SHAKEDigest(256);

    sd.update(in, 0, in.length);

    byte[] out = new byte[byteLen];

    sd.doFinal(out, 0, byteLen);

    return out;

}

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