Editing NID

= NID generation =

A way to generate a few sort of NIDs was found in 0.945 PSVita armlibgen.exe, and in 3.00 PS3 ppu-lv2-prx-libgen.exe:

<syntaxhighlight lang="C">
uint32_t nid = sha1(concat(name, suffix));
</source>

Suffixes can be found [https://psdevwiki.com/vita/index.php?title=Keys here], [https://www.psdevwiki.com/ps3/Keys#Modules here] and [https://wiki.henkaku.xyz/vita/NID here].

== PSP ==

PSP NIDs had no suffix until a certain System Software version around 3.50.

Since that version, the suffixes are unknown.

== PS3 ==

=== Regular exports ===

To calculate FNID value of exported/imported symbol from .PRX you need to take SHA-1 hash over concatenation of symbol's name and ps3_nid_suffix and then grab first 4 bytes from it and reverse these bytes (because of little-endian).
Let's take, for example, ''_sys_sprintf'':
  ''SHA1''('_sys_sprintf' + '\x67\x59\x65\x99\x04\x25\x04\x90\x56\x64\x27\x49\x94\x89\x74\x1A') = '''FEEAF9A1'''23D7D1A7619B40CD52500F9735A852A4
  ''FNID''('_sys_sprintf') = ''swap_uint32''('''0xFEEAF9A1''') = '''0xA1F9EAFE'''.

For C++ functions you should use mangled representation of symbol's name.
For example, mangled name of ''std::runtime_error::what() const'' is ''_ZNKSt13runtime_error4whatEv'' and FNID('_ZNKSt13runtime_error4whatEv') = '''0x5333BDC9'''.

More complex example:
FNID(mangle('std::basic_filebuf<wchar_t, std::char_traits<wchar_t> >::seekpos(std::fpos<std::
_Mbstatet>, std::_Iosb<int>::_Openmode)')) = FNID('_ZNSt13basic_filebufIwSt11char_traitsIwEE7seekposESt4fposISt9_MbstatetENSt5_IosbIiE9_OpenmodeE') = '''0xB6A4D760'''

=== NONAME exports ===

For import stubs with no names, you must use SHA1 over concatenation of symbol's name and ps3_noname_nid_suffix as an ascii string. Some examples of noname imports are module_start, module_info, and module_stop.
''SHA1''('module_info' + ps3_noname_nid_suffix) = '''1630f4d7'''0bf3df419db9d481983411fd3130482a = '''0xD7F43016'''

== PS Vita ==

=== Regular exports ===

Suffix is per-library. Some old PS Vita modules use suffixless NIDs.

=== NONAME exports ===

Suffix is known from PS Vita armlibgen.exe executable reverse-engineering.

= NID generation code =

Here is some code in C# with the example "sys_crash_dump_get_user_log_area":

<syntaxhighlight lang="C#">
 void main() { 
   byte[] input = GetBytes(BitConverter.ToString(Encoding.UTF8.GetBytes("sys_crash_dump_get_user_log_area")).Replace("-","") + "6759659904250490566427499489741A");
   Console.WriteLine(BitConverter.ToInt32( SHA1CryptoServiceProvider.Create().ComputeHash(input) ,0 ).ToString("X0"));
 }

 byte[] GetBytes(string str) {
   byte[] bytes = new byte[str.Length / 2];
   for (int i = 0; i < str.Length; i += 2)
       bytes[i / 2] = byte.Parse(str.Substring(i, 2), System.Globalization.NumberStyles.HexNumber);
   return bytes;
 }
</source>


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