OCRA::generateOCRA()

Complexity

Conditions	39
Paths	> 20000

Size

Total Lines	174
Code Lines	94

Duplication

Lines	0
Ratio	0 %

Importance

Changes	2
Bugs	0	Features	0

<?php 
    static function generateOCRA($ocraSuite,

It is generally recommended to explicitly declare the visibility for methods.

                                 $key,
                                 $counter,
                                 $question,
                                 $password,
                                 $sessionInformation,
                                 $timeStamp)
    {
        $codeDigits = 0;

The assignment to $codeDigits is dead and can be removed.

        $crypto = "";
        $result = null;

The assignment to $result is dead and can be removed.

        $ocraSuiteLength = strlen($ocraSuite);
        $counterLength = 0;
        $questionLength = 0;
        $passwordLength = 0;

        $sessionInformationLength = 0;
        $timeStampLength = 0;

        // How many digits should we return
        $components = explode(":", $ocraSuite);
        $cryptoFunction = $components[1];
        $dataInput = strtolower($components[2]); // lower here so we can do case insensitive comparisons
        
        if(stripos($cryptoFunction, "sha1")!==false)
            $crypto = "sha1";
        if(stripos($cryptoFunction, "sha256")!==false)
            $crypto = "sha256";
        if(stripos($cryptoFunction, "sha512")!==false)
            $crypto = "sha512";
        
        $codeDigits = substr($cryptoFunction, strrpos($cryptoFunction, "-")+1);
                
        // The size of the byte array message to be encrypted
        // Counter
        if($dataInput[0] == "c" ) {
            // Fix the length of the HEX string
            while(strlen($counter) < 16)
                $counter = "0" . $counter;
            $counterLength=8;
        }
        // Question
        if($dataInput[0] == "q" ||
                stripos($dataInput, "-q")!==false) {
            while(strlen($question) < 256)
                $question = $question . "0";
            $questionLength=128;
        }

        // Password
        if(stripos($dataInput, "psha1")!==false) {
            while(strlen($password) < 40)
                $password = "0" . $password;
            $passwordLength=20;
        }
    
        if(stripos($dataInput, "psha256")!==false) {
            while(strlen($password) < 64)
                $password = "0" . $password;
            $passwordLength=32;
        }
        
        if(stripos($dataInput, "psha512")!==false) {
            while(strlen($password) < 128)
                $password = "0" . $password;
            $passwordLength=64;
        }
        
        // sessionInformation
        if(stripos($dataInput, "s064") !==false) {
            while(strlen($sessionInformation) < 128)
                $sessionInformation = "0" . $sessionInformation;

            $sessionInformationLength=64;
        } else if(stripos($dataInput, "s128") !==false) {
            while(strlen($sessionInformation) < 256)
                $sessionInformation = "0" . $sessionInformation;
        
            $sessionInformationLength=128;
        } else if(stripos($dataInput, "s256") !==false) {
            while(strlen($sessionInformation) < 512)
                $sessionInformation = "0" . $sessionInformation;
        
            $sessionInformationLength=256;
        } else if(stripos($dataInput, "s512") !==false) {
            while(strlen($sessionInformation) < 128)
                $sessionInformation = "0" . $sessionInformation;
        
            $sessionInformationLength=64;
        } else if (stripos($dataInput, "s") !== false ) {
            // deviation from spec. Officially 's' without a length indicator is not in the reference implementation.
            // RFC is ambigious. However we have supported this in Tiqr since day 1, so we continue to support it.
            while(strlen($sessionInformation) < 128)
                $sessionInformation = "0" . $sessionInformation;
            
            $sessionInformationLength=64;
        }
        
        
             
        // TimeStamp
        if($dataInput[0] == "t" ||
                stripos($dataInput, "-t") !== false) {
            while(strlen($timeStamp) < 16)
                $timeStamp = "0" . $timeStamp;
            $timeStampLength=8;
        }

        // Put the bytes of "ocraSuite" parameters into the message
        
        $msg = array_fill(0,$ocraSuiteLength+$counterLength+$questionLength+$passwordLength+$sessionInformationLength+$timeStampLength+1, 0);
                
        for($i=0;$i<strlen($ocraSuite);$i++) {
            $msg[$i] = $ocraSuite[$i];
        }
        
        // Delimiter
        $msg[strlen($ocraSuite)] = self::_hexStr2Bytes("0");

        // Put the bytes of "Counter" to the message
        // Input is HEX encoded
        if($counterLength > 0 ) {
            $bArray = self::_hexStr2Bytes($counter);
            for ($i=0;$i<strlen($bArray);$i++) {
                $msg [$i + $ocraSuiteLength + 1] = $bArray[$i];
            }
        }


        // Put the bytes of "question" to the message
        // Input is text encoded
        if($questionLength > 0 ) {
            $bArray = self::_hexStr2Bytes($question);
            for ($i=0;$i<strlen($bArray);$i++) {
                $msg [$i + $ocraSuiteLength + 1 + $counterLength] = $bArray[$i];
            }
        }

        // Put the bytes of "password" to the message
        // Input is HEX encoded
        if($passwordLength > 0){
            $bArray = self::_hexStr2Bytes($password);
            for ($i=0;$i<strlen($bArray);$i++) {
                $msg [$i + $ocraSuiteLength + 1 + $counterLength + $questionLength] = $bArray[$i];
            }
        }

        // Put the bytes of "sessionInformation" to the message
        // Input is text encoded
        if($sessionInformationLength > 0 ){
            $bArray = self::_hexStr2Bytes($sessionInformation);
            for ($i=0;$i<strlen($bArray);$i++) {
                $msg [$i + $ocraSuiteLength + 1 + $counterLength + $questionLength + $passwordLength] = $bArray[$i];
            }
        }

        // Put the bytes of "time" to the message
        // Input is text value of minutes
        if($timeStampLength > 0){
            $bArray = self::_hexStr2Bytes($timeStamp);
            for ($i=0;$i<strlen($bArray);$i++) {
                $msg [$i + $ocraSuiteLength + 1 + $counterLength + $questionLength + $passwordLength + $sessionInformationLength] = $bArray[$i];
            }
        }
        
        $byteKey = self::_hexStr2Bytes($key);
              
        $msg = implode("", $msg);
        
        $hash = self::_hmac_sha1($crypto, $byteKey, $msg);
        
        $result = self::_oath_truncate($hash, $codeDigits);
             
        return $result;

The expression return $result returns the type string which is incompatible with the documented return type A.

    }