}
            }
        }
        return out.toString();
    }

    /**
     * <p>Returns an upper case hexadecimal <code>String</code> for the given
     * character.</p>
     *
     * @param ch The character to convert.
     * @return An upper case hexadecimal <code>String</code>
     */
    protected static String hex(char ch) {
        return Integer.toHexString(ch).toUpperCase(Locale.ENGLISH);

                }
            }
        }
        return out.toString();
    }

    /**
     * <p>Returns an upper case hexadecimal <code>String</code> for the given
     * character.</p>
     *
     * @param ch The character to convert.
     * @return An upper case hexadecimal <code>String</code>
     */
    protected static String hex(char ch) {
        return Integer.toHexString(ch).toUpperCase(Locale.ENGLISH);

      }
      value = (value * radix) + digit;
    }

    return value;
  }

  /**
   * Returns the unsigned {@code long} value represented by the given string.
   *
   * <p>Accepts a decimal, hexadecimal, or octal number given by specifying the following prefix:
   *
   * <ul>
   *   <li>{@code 0x}<i>HexDigits</i>
   *   <li>{@code 0X}<i>HexDigits</i>
   *   <li>{@code #}<i>HexDigits</i>

	regionBytes := sumHMAC(date, []byte(region))
	service := sumHMAC(regionBytes, []byte(stype))
	signingKey := sumHMAC(service, []byte("aws4_request"))
	return signingKey
}

// getSignature final signature in hexadecimal form.
func getSignature(signingKey []byte, stringToSign string) string {
	return hex.EncodeToString(sumHMAC(signingKey, []byte(stringToSign)))
}

// Check to see if Policy is signed correctly.

   * creation time, while Android may always output it as an interface name, even if it was supplied
   * as a numeric ID.
   *
   * <p>This method uses hexadecimal for all IPv6 addresses, including IPv4-mapped IPv6 addresses
   * such as "::c000:201".
   *
   * @param ip {@link InetAddress} to be converted to an address string

  @GwtIncompatible // Doubles.tryParse
  public void testTryParseOfToStringIsOriginal() {
    for (double d : NUMBERS) {
      checkTryParse(d, Double.toString(d));
    }
  }

  @J2ktIncompatible // hexadecimal doubles
  @GwtIncompatible // Doubles.tryParse
  public void testTryParseOfToHexStringIsOriginal() {
    for (double d : NUMBERS) {
      checkTryParse(d, Double.toHexString(d));
    }
  }

    return (int) (toLong(dividend) % toLong(divisor));
  }

  /**
   * Returns the unsigned {@code int} value represented by the given string.
   *
   * <p>Accepts a decimal, hexadecimal, or octal number given by specifying the following prefix:
   *
   * <ul>
   *   <li>{@code 0x}<i>HexDigits</i>
   *   <li>{@code 0X}<i>HexDigits</i>
   *   <li>{@code #}<i>HexDigits</i>

An exponent value exp scales the mantissa (integer and fractional part) by 10<sup>exp</sup>.
</p>

<p>
A hexadecimal floating-point literal consists of a <code>0x</code> or <code>0X</code>
prefix, an integer part (hexadecimal digits), a radix point, a fractional part (hexadecimal digits),
and an exponent part (<code>p</code> or <code>P</code> followed by an optional sign and decimal digits).

      "Invalid URL host: \"[0:0:0:0:0:1:0.0.0.000001]\"",
    )
  }

  @Test
  fun hostIpv6WithIpv4SuffixWithHexadecimalPrefix() {
    // Chrome interprets a leading '0x' as hexadecimal; Firefox rejects them. (We reject them.)
    assertInvalid(
      "http://[0:0:0:0:0:1:0.0x10.0.0x10]/",
      "Invalid URL host: \"[0:0:0:0:0:1:0.0x10.0.0x10]\"",
    )
  }

  @Test

1<<3 | 1<<1 | 1<<0 // x⁸ + x⁴ + x³ + x + 1 // Powers of x mod poly in GF(2). var powx = [16]byte{ 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, } // FIPS-197 Figure 7. S-box substitution values in hexadecimal format. var sbox0 = [256]byte{ 0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76, 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0, 0xb7, 0xfd, 0x93, 0x26,...