2.3.7.5 Binary Document XOR Array Initialization Method 2

The CreateXorArray_Method2 procedure specifies how a 16-byte XOR obfuscation array is initialized. The procedure takes the following parameter:

• Password: A string of single-byte characters that specifies the password to be used to encrypt the data. Password MUST NOT be longer than 15 characters. Password MUST be transformed from Unicode to single-byte characters by using the method specified in section 2.3.7.4, which results in the password verifier matching.

   FUNCTION CreateXorArray_Method2
       PARAMETERS Password
       RETURNS array of 8-bit unsigned integers
       
       DECLARE Verifier as 32-bit unsigned integer
       DECLARE VerifierHighWord as 16-bit unsigned integer
       DECLARE KeyHigh as 8-bit unsigned integer
       DECLARE KeyLow as 8-bit unsigned integer
    
       SET Verifier TO CreatePasswordVerifier_Method2(Password)
       SET VerifierHighWord TO 16 most significant bits of Verifier
       SET KeyHigh TO 8 most significant bits of VerifierHighWord
       SET KeyLow TO 8 least significant bits of VerifierHighWord
    
       SET PadArray TO (0xBB, 0xFF, 0xFF, 0xBA, 0xFF, 0xFF, 0xB9, 0x80,
                        0x00, 0xBE, 0x0F, 0x00, 0xBF, 0x0F, 0x00)
       SET ObfuscationArray TO (0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00)
    
       SET Index TO 0
       WHILE Index IS LESS THAN Password.Length
           SET ObfuscationArray[Index] TO Password[Index]
           INCREMENT Index
       END WHILE
       WHILE Index IS LESS THAN 16
           SET ObfuscationArray[Index] TO PadArray[Index MINUS Password.Length]
           INCREMENT Index
       END WHILE
    
       SET Index TO 0
       WHILE Index IS LESS THAN 16
           SET Temp1 TO ObfuscationArray[Index] BITWISE XOR KeyLow
           SET ObfuscationArray[Index] TO Ror(Temp1)
    
           INCREMENT Index
    
           SET Temp1 TO ObfuscationArray[Index] BITWISE XOR KeyHigh
           SET ObfuscationArray[Index] TO Ror(Temp1)
    
           INCREMENT Index
       END WHILE
    
       RETURN ObfuscationArray
   END FUNCTION