kerby-common/kerby-util/src/main/java/org/apache/kerby/util/HexUtil.java [34:108]:
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    public static String bytesToHexFriendly(byte[] bytes) {
        int len = bytes.length * 2;
        len += bytes.length; // for ' ' appended for each char
        len += 2; // for '0x' prefix
        char[] hexChars = new char[len];
        hexChars[0] = '0';
        hexChars[1] = 'x';
        for (int j = 0; j < bytes.length; j++) {
            int v = bytes[j] & 0xFF;
            hexChars[j * 3 + 2] = HEX_CHARS[v >>> 4];
            hexChars[j * 3 + 3] = HEX_CHARS[v & 0x0F];
            hexChars[j * 3 + 4] = ' ';
        }

        return new String(hexChars);
    }

    /**
     * Convert friendly hex string like follows into byte array
     * 0x02 02 00 80
     * @param hexString The hex string
     * @return The bytes
     */
    public static byte[] hex2bytesFriendly(String hexString) {
        hexString = hexString.toUpperCase();
        String hexStr = hexString;
        if (hexString.startsWith("0X")) {
            hexStr = hexString.substring(2);
        }
        String[] hexParts = hexStr.split(" ");

        byte[] bytes = new byte[hexParts.length];
        char[] hexPart;
        for (int i = 0; i < hexParts.length; ++i) {
            hexPart = hexParts[i].toCharArray();
            if (hexPart.length != 2) {
                throw new IllegalArgumentException("Invalid hex string to convert");
            }
            bytes[i] = (byte) ((HEX_CHARS_STR.indexOf(hexPart[0]) << 4)
                + HEX_CHARS_STR.indexOf(hexPart[1]));
        }

        return bytes;
    }

    /**
     * Convert bytes into format as:
     * 02020080
     * @param bytes The bytes
     * @return The hex string
     */
    public static String bytesToHex(byte[] bytes) {
        int len = bytes.length * 2;
        char[] hexChars = new char[len];
        for (int j = 0; j < bytes.length; j++) {
            int v = bytes[j] & 0xFF;
            hexChars[j * 2] = HEX_CHARS[v >>> 4];
            hexChars[j * 2 + 1] = HEX_CHARS[v & 0x0F];
        }

        return new String(hexChars);
    }

    /**
     * Convert hex string like follows into byte array
     * 02020080
     * @param hexString The hex string
     * @return The bytes
     */
    public static byte[] hex2bytes(String hexString) {
        hexString = hexString.toUpperCase();
        int len = hexString.length() / 2;
        byte[] bytes = new byte[len];
        char[] hexChars = hexString.toCharArray();
        for (int i = 0, j = 0; i < len; ++i) {
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kerby-common/kerby-xdr/src/main/java/org/apache/kerby/xdr/util/HexUtil.java [35:108]:
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    public static String bytesToHexFriendly(byte[] bytes) {
        int len = bytes.length * 2;
        len += bytes.length; // for ' ' appended for each char
        len += 2; // for '0x' prefix
        char[] hexChars = new char[len];
        hexChars[0] = '0';
        hexChars[1] = 'x';
        for (int j = 0; j < bytes.length; j++) {
            int v = bytes[j] & 0xFF;
            hexChars[j * 3 + 2] = HEX_CHARS[v >>> 4];
            hexChars[j * 3 + 3] = HEX_CHARS[v & 0x0F];
            hexChars[j * 3 + 4] = ' ';
        }

        return new String(hexChars);
    }

    /**
     * Convert friendly hex string like follows into byte array
     * 0x02 02 00 80
     * @param hexString
     */
    public static byte[] hex2bytesFriendly(String hexString) {
        hexString = hexString.toUpperCase();
        String hexStr = hexString;
        if (hexString.startsWith("0X")) {
            hexStr = hexString.substring(2);
        }
        String[] hexParts = hexStr.split(" ");

        byte[] bytes = new byte[hexParts.length];
        char[] hexPart;
        for (int i = 0; i < hexParts.length; ++i) {
            hexPart = hexParts[i].toCharArray();
            if (hexPart.length != 2) {
                throw new IllegalArgumentException("Invalid hex string to convert");
            }
            bytes[i] = (byte) ((HEX_CHARS_STR.indexOf(hexPart[0]) << 4)
                + HEX_CHARS_STR.indexOf(hexPart[1]));
        }

        return bytes;
    }

    /**
     * Convert bytes into format as:
     * 02020080
     * @param bytes The bytes
     * @return The hex string
     */
    public static String bytesToHex(byte[] bytes) {
        int len = bytes.length * 2;
        char[] hexChars = new char[len];
        for (int j = 0; j < bytes.length; j++) {
            int v = bytes[j] & 0xFF;
            hexChars[j * 2] = HEX_CHARS[v >>> 4];
            hexChars[j * 2 + 1] = HEX_CHARS[v & 0x0F];
        }

        return new String(hexChars);
    }

    /**
     * Convert hex string like follows into byte array
     * 02020080
     * @param hexString The hex string
     * @return The bytes
     */
    public static byte[] hex2bytes(String hexString) {
        hexString = hexString.toUpperCase();
        int len = hexString.length() / 2;
        byte[] bytes = new byte[len];
        char[] hexChars = hexString.toCharArray();
        for (int i = 0, j = 0; i < len; ++i) {
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