private int wrappingSize(int inputSize) {
    int paddingSize = 7 - (inputSize + 7) % 8;
    return inputSize + paddingSize + 8;
  }
Returns the size of a wrapped key for a given input size.
@param inputSize the size of the key to wrap in bytes.
java_src/src/main/java/com/google/crypto/tink/subtle/Kwp.java