@Override
    protected byte[] engineUpdate(byte[] input, int inputOffset, int inputLen) {
        if (bufferOffset + inputLen > buffer.length) {
            inputTooLarge = true;
            return EmptyArray.BYTE;
        }

        System.arraycopy(input, inputOffset, buffer, bufferOffset, inputLen);
        bufferOffset += inputLen;
        return EmptyArray.BYTE;
    }
Returns {@code true} if the cipher has been initialized.
common/src/main/java/org/conscrypt/OpenSSLCipherRSA.java