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Push — v7 ( a687dc...e264c8 )
by Florent
02:28
created

NumberSize::bnNumBits()   A

↳ Parent: NumberSize

Complexity

Conditions 3
Paths 3

Size

Total Lines 15
Code Lines 9

Duplication

Lines 0
Ratio 0 %

Importance

Changes 0
Metric Value
dl 0
loc 15
rs 9.4285
c 0
b 0
f 0
cc 3
eloc 9
nc 3
nop 2
1 
<?php
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namespace Jose\Component\Core\Util\Ecc\Util;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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use Jose\Component\Core\Util\Ecc\Math\GmpMath;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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final class NumberSize

            


            
                                                                                                            
                            
            
                                    
            
            

                
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{

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    /**

            


            
                                                                                                            
                            
            
                                    
            
            

                
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     * Returns the number of bits used to store this number. Non-singicant upper bits are not counted.

            


            
                                                                                                            
                            
            
                                    
            
            

                
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     *

            


            
                                                                                                            
                            
            
                                    
            
            

                
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     * @param  GmpMath $adapter

            


            
                                                                                                            
                            
            
                                    
            
            

                
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     * @param  \GMP             $x

            


            
                                                                                                            
                            
            
                                    
            
            

                
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     * @return number

            


            
                                                                                                            
                            
            
                                    
            
            

                
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     *

            


            
                                                                                                            
                            
            
                                    
            
            

                
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     * @link https://www.openssl.org/docs/crypto/BN_num_bytes.html

            


            
                                                                                                            
                                                                
            
                                    
            
            

                
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     */

            


            
                                                        
            
                                    
            
            

                
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    public static function bnNumBits(GmpMath $adapter, \GMP $x)

            


            
                                                        
            
                                    
            
            

                
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    {

            


            
                                                        
            
                                    
            
            

                
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        $zero = gmp_init(0, 10);

            


            
                                                        
            
                                    
            
            

                
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        if ($adapter->equals($x, $zero)) {

            


            
                                                        
            
                                    
            
            

                
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            return 0;

            


            
                                                        
            
                                    
            
            

                
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        }

            


            
                                                        
            
                                    
            
            

                
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        $log2 = 0;

            


            
                                                        
            
                                    
            
            

                
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        while (false === $adapter->equals($x, $zero)) {

            


            
                                                        
            
                                    
            
            

                
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            $x = $adapter->rightShift($x, 1);

            


            
                                                        
            
                                    
            
            

                
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            $log2++;

            


            
                                                        
            
                                    
            
            

                
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        }

            


            
                                                        
            
                                    
            
            

                
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        return $log2 ;

            


            
                                                        
            
                                    
            
            

                
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    }

            


            
                                                        
            
                                    
            
            

                
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}

            


            
                                                        
            
                                    
            
            

                
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