What namespace does the JDK use to generate a UUID with nameUUIDFromBytes?

Question

The Sun/Oracle JDK exposes a function to create a type 3 (name based) UUID in the java.util package: java.util.UUID.nameUUIDFromBytes(byte[] name).

I need to be able

Answer 1

A Sample Code:

String NameSpace_OID_string = "6ba7b812-9dad-11d1-80b4-00c04fd430c8";
UUID NameSpace_OID_uuid = UUID.fromString(NameSpace_OID_string);

long msb = NameSpace_OID_uuid.getMostSignificantBits();
long lsb = NameSpace_OID_uuid.getLeastSignificantBits();

    byte[] NameSpace_OID_buffer = new byte[16];

    for (int i = 0; i < 8; i++) {
        NameSpace_OID_buffer[i] = (byte) (msb >>> 8 * (7 - i));
    }
    for (int i = 8; i < 16; i++) {
        NameSpace_OID_buffer[i] = (byte) (lsb >>> 8 * (7 - i));
    }

    String name = "user123";
    byte[] name_buffer = name.getBytes();

ByteArrayOutputStream outputStream = new ByteArrayOutputStream( );
try {
    outputStream.write( NameSpace_OID_buffer);
    outputStream.write( name_buffer );
} catch (IOException e) {
        // TODO Auto-generated catch block
    e.printStackTrace();
}


byte byteArray[] = outputStream.toByteArray();

System.out.println(UUID.nameUUIDFromBytes(byteArray).toString());