binary Sid To String Sid - Java Network

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Description

binary Sid To String Sid

Demo Code


//package com.java2s;

public class Main {
    public static String binarySidToStringSid(String SID) {
        // A SID is max 28 bytes - http://msdn.microsoft.com/en-us/library/cc221018%28v=PROT.13%29.aspx
        // However the RID/SubAuthority is a variable length list of 16 byte additional chunks
        // https://msdn.microsoft.com/en-us/library/cc230371.aspx and https://msdn.microsoft.com/en-us/library/gg465313.aspx
        byte[] bytes = new byte[SID.length() / 3];
        int byteNum = 0;

        // parse unsigned SID represented as \01\05\00\00\00\00\00\05\15\00\00\00\dc\2f\15\0b\e5\76\d3\8c\be\0b\4e\be\01\02\00\00
        // into corresponding signed byte array (in Java bytes are signed so we need to do a little fancy footwork)
        for (int i = 0; i < SID.length(); i++) {
            char c = SID.charAt(i);

            if (c == '\\') {
                int highByte = Character.digit(SID.charAt(++i), 16);
                int lowByte = Character.digit(SID.charAt(++i), 16);

                int value = 16 * highByte + lowByte;

                // convert the byte to a signed value, Java requires this since byte is signed
                if (value < 128)
                    bytes[byteNum++] = (byte) value;
                else
                    bytes[byteNum++] = (byte) (value - 256);
            }//  www . j av a 2  s  . co m
        }

        return binarySidToStringSid(bytes);
    }

    public static String binarySidToStringSid(byte[] SID) {
        StringBuilder strSID = new StringBuilder("S-");

        // bytes[0] : in the array is the version (must be 1 but might
        // change in the future)
        strSID.append(SID[0]).append('-');

        // bytes[2..7] : the Authority
        StringBuilder tmpBuff = new StringBuilder();
        for (int t = 2; t <= 7; t++) {
            String hexString = Integer.toHexString(SID[t] & 0xFF);
            tmpBuff.append(hexString);
        }
        strSID.append(Long.parseLong(tmpBuff.toString(), 16));

        // bytes[1] : the sub authorities count
        int count = SID[1];

        // bytes[8..end] : the sub authorities (these are Integers - notice
        // the endian)
        for (int i = 0; i < count; i++) {
            int currSubAuthOffset = i * 4;
            tmpBuff.setLength(0);
            tmpBuff.append(String.format("%02X%02X%02X%02X",
                    (SID[11 + currSubAuthOffset] & 0xFF),
                    (SID[10 + currSubAuthOffset] & 0xFF),
                    (SID[9 + currSubAuthOffset] & 0xFF),
                    (SID[8 + currSubAuthOffset] & 0xFF)));

            strSID.append('-').append(
                    Long.parseLong(tmpBuff.toString(), 16));
        }

        return strSID.toString();
    }
}

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