Method create

CodenameOne/src/com/codename1/security/Hmac.java:69–89

(String algorithm, byte[] key)

    ///   is no enforced minimum but for security 128-256 bits of entropy is
    ///   recommended.
    public static Hmac create(String algorithm, byte[] key) {
        MessageDigestImpl h = MessageDigestImpl.create(algorithm);
        int blockSize = blockSizeFor(algorithm);

        byte[] k = key;
        if (k.length > blockSize) {
            h.update(k, 0, k.length);
            k = h.digest();
            h.reset();
        }
        byte[] paddedKey = new byte[blockSize];
        System.arraycopy(k, 0, paddedKey, 0, k.length);

        byte[] inner = new byte[blockSize];
        byte[] outer = new byte[blockSize];
        for (int i = 0; i < blockSize; i++) {
            inner[i] = (byte) (paddedKey[i] ^ 0x36);
            outer[i] = (byte) (paddedKey[i] ^ 0x5c);
        }
        return new Hmac(h, outer, inner);
    }

    private static int blockSizeFor(String algorithm) {
        String a = MessageDigestImpl.normalise(algorithm);