if (value != null) {                            data = new byte[value.length() / 2 + 1];                            int pos = 0;                            for (char c: value.toCharArray()) {                                int hex;                                if (c >= '0' && c <= '9') {                                    hex = c - '0' ;                                } else if (c >= 'A' && c <= 'F') {                                    hex = c - 'A' + 10;                                } else if (c >= 'a' && c <= 'f') {                                    hex = c - 'a' + 10;                                } else {                                    continue;                                }                                if (pos % 2 == 0) {                                    data[pos/2] = (byte)(hex << 4);                                } else {                                    data[pos/2] += hex;                                }                                pos++;                            }                            if (pos % 2 != 0) {                                throw new Exception(rb.getString(                                        "Odd.number.of.hex.digits.found.") + extstr);                            }                            data = Arrays.copyOf(data, pos/2);                        } else {                            data = new byte[0];                        }                        ext.set(oid.toString(), new Extension(oid, isCritical,                                new DerValue(DerValue.tag_OctetString, data)                                        .toByteArray()));                        break;                    default:                        throw new Exception(rb.getString(                                "Unknown.extension.type.") + extstr);                }            }            // always non-critical            ext.set(SubjectKeyIdentifierExtension.NAME,                    new SubjectKeyIdentifierExtension(                        new KeyIdentifier(pkey).getIdentifier()));            if (akey != null && !pkey.equals(akey)) {                ext.set(AuthorityKeyIdentifierExtension.NAME,                        new AuthorityKeyIdentifierExtension(                        new KeyIdentifier(akey), null, null));            }        } catch(IOException e) {            throw new RuntimeException(e);        }        return ext;    }     /**     * Prints the usage of this tool.     */    private void usage() {        if (command != null) {            System.err.println("keytool " + command +                    rb.getString(".OPTION."));            System.err.println();            System.err.println(rb.getString(command.description));            System.err.println();            System.err.println(rb.getString("Options."));            System.err.println();             // Left and right sides of the options list            String[] left = new String[command.options.length];            String[] right = new String[command.options.length];             // Check if there's an unknown option            boolean found = false;             // Length of left side of options list            int lenLeft = 0;            for (int j=0; j<left.length; j++) {                Option opt = command.options[j];                left[j] = opt.toString();                if (opt.arg != null) left[j] += " " + opt.arg;                if (left[j].length() > lenLeft) {                    lenLeft = left[j].length();                }                right[j] = rb.getString(opt.description);            }            for (int j=0; j<left.length; j++) {                System.err.printf(" %-" + lenLeft + "s  %s\n",                        left[j], right[j]);            }            System.err.println();            System.err.println(rb.getString(                    "Use.keytool.help.for.all.available.commands"));        } else {            System.err.println(rb.getString(                    "Key.and.Certificate.Management.Tool"));            System.err.println();            System.err.println(rb.getString("Commands."));            System.err.println();            for (Command c: Command.values()) {                if (c == KEYCLONE) break;                System.err.printf(" %-20s%s\n", c, rb.getString(c.description));            }            System.err.println();            System.err.println(rb.getString(                    "Use.keytool.command.name.help.for.usage.of.command.name"));        }    }     private void tinyHelp() {        usage();        if (debug) {            throw new RuntimeException("NO BIG ERROR, SORRY");        } else {            System.exit(1);        }    }     private void errorNeedArgument(String flag) {        Object[] source = {flag};        System.err.println(new MessageFormat(                rb.getString("Command.option.flag.needs.an.argument.")).format(source));        tinyHelp();    }     private char[] getPass(String modifier, String arg) {        char[] output = getPassWithModifier(modifier, arg);        if (output != null) return output;        tinyHelp();        return null;    // Useless, tinyHelp() already exits.    }     // This method also used by JarSigner    public static char[] getPassWithModifier(String modifier, String arg) {        if (modifier == null) {            return arg.toCharArray();        } else if (collator.compare(modifier, "env") == 0) {            String value = System.getenv(arg);            if (value == null) {                System.err.println(rb.getString(                        "Cannot.find.environment.variable.") + arg);                return null;            } else {                return value.toCharArray();            }        } else if (collator.compare(modifier, "file") == 0) {            try {                URL url = null;                try {                    url = new URL(arg);                } catch (java.net.MalformedURLException mue) {                    File f = new File(arg);                    if (f.exists()) {                        url = f.toURI().toURL();                    } else {                        System.err.println(rb.getString(                                "Cannot.find.file.") + arg);                        return null;                    }                }                BufferedReader br = new BufferedReader(new InputStreamReader(                            url.openStream()));                String value = br.readLine();                br.close();                if (value == null) {                    return new char[0];                } else {                    return value.toCharArray();                }            } catch (IOException ioe) {                System.err.println(ioe);                return null;            }        } else {            System.err.println(rb.getString("Unknown.password.type.") +                    modifier);            return null;        }    }} // This class is exactly the same as com.sun.tools.javac.util.Pair,// it's copied here since the original one is not included in JRE.class Pair<A, B> {     public final A fst;    public final B snd;     public Pair(A fst, B snd) {        this.fst = fst;        this.snd = snd;    }     public String toString() {        return "Pair[" + fst + "," + snd + "]";    }     private static boolean equals(Object x, Object y) {        return (x == null && y == null) || (x != null && x.equals(y));    }     public boolean equals(Object other) {        return            other instanceof Pair &&            equals(fst, ((Pair)other).fst) &&            equals(snd, ((Pair)other).snd);    }     public int hashCode() {        if (fst == null) return (snd == null) ? 0 : snd.hashCode() + 1;        else if (snd == null) return fst.hashCode() + 2;        else return fst.hashCode() * 17 + snd.hashCode();    }     public static <A,B> Pair<A,B> of(A a, B b) {        return new Pair<>(a,b);    }} 

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