Little method can go a long way

V6007 Expression ‘(int)x < 0' is always false. BCrypt.java 429
V6025 Possibly index '(int) x' is out of bounds. BCrypt.java 431

private static byte char64(char x) {
  if ((int)x  index_64.length)
    return -1;
  return index_64[(int)x];
}

Issue N1. The expression ‘(int)x ) with “greater than or equal to (“>=”).

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