ParagonIE_Sodium_Core_Curve25519::sc25519_mul( string $a, string $b ): string

Compatibility

Present in every tracked release (6.7.7 to 7.1.0), and compiles on PHP 7.4 through 8.6-dev.

Parameters

$astring

$bstring

Return value

string

Performance profile

How much work a call to ParagonIE_Sodium_Core_Curve25519::sc25519_mul() does, and what it touches: the algorithmic scaling, the Zend instruction count per call across PHP versions, the hooks it hands control to, and the core code that calls it. Measured from the compiled opcodes, not a stopwatch, so every number is identical on any machine running the same PHP version, and every function in core is ranked by cost.

Cost class

Light

Touches nothing outside its own arguments.

Scaling

Constant

No loop in the body: the same number of instructions runs whatever you pass in.

Instructions

2034

Executed per call on PHP 8.5. The body compiles to 2034.

Plugin surface

None

Nothing here hands control to plugin code.

Called by

3

3 places in core call this, so the cost is paid more often than your own code shows.

What one call costs · 1 distinct outcome

One number would be a lie: the work depends on which branch runs. These are every distinct cost ParagonIE_Sodium_Core_Curve25519::sc25519_mul() can have, taken from its control-flow graph on PHP 8.5.

Uses · 5

• ParagonIE_Sodium_Core_Curve25519::load_3()
• ParagonIE_Sodium_Core_Curve25519::substr()
• ParagonIE_Sodium_Core_Curve25519::load_4()
• ParagonIE_Sodium_Core_Curve25519::mul()
• ParagonIE_Sodium_Core_Curve25519::intArrayToString()

Used by · 3

• ParagonIE_Sodium_Core_Curve25519::sc25519_invert()
• ParagonIE_Sodium_Core_Curve25519::sc25519_sq()
• ParagonIE_Sodium_Core_Curve25519::sc25519_sqmul()

Source code

View on Trac ↗View on GitHub ↗

2913    public static function sc25519_mul($a, $b)2914    {2915        //    int64_t a0  = 2097151 & load_3(a);2916        //    int64_t a1  = 2097151 & (load_4(a + 2) >> 5);2917        //    int64_t a2  = 2097151 & (load_3(a + 5) >> 2);2918        //    int64_t a3  = 2097151 & (load_4(a + 7) >> 7);2919        //    int64_t a4  = 2097151 & (load_4(a + 10) >> 4);2920        //    int64_t a5  = 2097151 & (load_3(a + 13) >> 1);2921        //    int64_t a6  = 2097151 & (load_4(a + 15) >> 6);2922        //    int64_t a7  = 2097151 & (load_3(a + 18) >> 3);2923        //    int64_t a8  = 2097151 & load_3(a + 21);2924        //    int64_t a9  = 2097151 & (load_4(a + 23) >> 5);2925        //    int64_t a10 = 2097151 & (load_3(a + 26) >> 2);2926        //    int64_t a11 = (load_4(a + 28) >> 7);2927        $a0  = 2097151 &  self::load_3(self::substr($a, 0, 3));2928        $a1  = 2097151 & (self::load_4(self::substr($a, 2, 4)) >> 5);2929        $a2  = 2097151 & (self::load_3(self::substr($a, 5, 3)) >> 2);2930        $a3  = 2097151 & (self::load_4(self::substr($a, 7, 4)) >> 7);2931        $a4  = 2097151 & (self::load_4(self::substr($a, 10, 4)) >> 4);2932        $a5  = 2097151 & (self::load_3(self::substr($a, 13, 3)) >> 1);2933        $a6  = 2097151 & (self::load_4(self::substr($a, 15, 4)) >> 6);2934        $a7  = 2097151 & (self::load_3(self::substr($a, 18, 3)) >> 3);2935        $a8  = 2097151 &  self::load_3(self::substr($a, 21, 3));2936        $a9  = 2097151 & (self::load_4(self::substr($a, 23, 4)) >> 5);2937        $a10 = 2097151 & (self::load_3(self::substr($a, 26, 3)) >> 2);2938        $a11 = (self::load_4(self::substr($a, 28, 4)) >> 7);2939 2940        //    int64_t b0  = 2097151 & load_3(b);2941        //    int64_t b1  = 2097151 & (load_4(b + 2) >> 5);2942        //    int64_t b2  = 2097151 & (load_3(b + 5) >> 2);2943        //    int64_t b3  = 2097151 & (load_4(b + 7) >> 7);2944        //    int64_t b4  = 2097151 & (load_4(b + 10) >> 4);2945        //    int64_t b5  = 2097151 & (load_3(b + 13) >> 1);2946        //    int64_t b6  = 2097151 & (load_4(b + 15) >> 6);2947        //    int64_t b7  = 2097151 & (load_3(b + 18) >> 3);2948        //    int64_t b8  = 2097151 & load_3(b + 21);2949        //    int64_t b9  = 2097151 & (load_4(b + 23) >> 5);2950        //    int64_t b10 = 2097151 & (load_3(b + 26) >> 2);2951        //    int64_t b11 = (load_4(b + 28) >> 7);2952        $b0  = 2097151 &  self::load_3(self::substr($b, 0, 3));2953        $b1  = 2097151 & (self::load_4(self::substr($b, 2, 4)) >> 5);2954        $b2  = 2097151 & (self::load_3(self::substr($b, 5, 3)) >> 2);2955        $b3  = 2097151 & (self::load_4(self::substr($b, 7, 4)) >> 7);2956        $b4  = 2097151 & (self::load_4(self::substr($b, 10, 4)) >> 4);2957        $b5  = 2097151 & (self::load_3(self::substr($b, 13, 3)) >> 1);2958        $b6  = 2097151 & (self::load_4(self::substr($b, 15, 4)) >> 6);2959        $b7  = 2097151 & (self::load_3(self::substr($b, 18, 3)) >> 3);2960        $b8  = 2097151 &  self::load_3(self::substr($b, 21, 3));2961        $b9  = 2097151 & (self::load_4(self::substr($b, 23, 4)) >> 5);2962        $b10 = 2097151 & (self::load_3(self::substr($b, 26, 3)) >> 2);2963        $b11 = (self::load_4(self::substr($b, 28, 4)) >> 7);2964 2965        //    s0 = a0 * b0;2966        //    s1 = a0 * b1 + a1 * b0;2967        //    s2 = a0 * b2 + a1 * b1 + a2 * b0;2968        //    s3 = a0 * b3 + a1 * b2 + a2 * b1 + a3 * b0;2969        //    s4 = a0 * b4 + a1 * b3 + a2 * b2 + a3 * b1 + a4 * b0;2970        //    s5 = a0 * b5 + a1 * b4 + a2 * b3 + a3 * b2 + a4 * b1 + a5 * b0;2971        //    s6 = a0 * b6 + a1 * b5 + a2 * b4 + a3 * b3 + a4 * b2 + a5 * b1 + a6 * b0;2972        //    s7 = a0 * b7 + a1 * b6 + a2 * b5 + a3 * b4 + a4 * b3 + a5 * b2 +2973        //        a6 * b1 + a7 * b0;2974        //    s8 = a0 * b8 + a1 * b7 + a2 * b6 + a3 * b5 + a4 * b4 + a5 * b3 +2975        //        a6 * b2 + a7 * b1 + a8 * b0;2976        //    s9 = a0 * b9 + a1 * b8 + a2 * b7 + a3 * b6 + a4 * b5 + a5 * b4 +2977        //        a6 * b3 + a7 * b2 + a8 * b1 + a9 * b0;2978        //    s10 = a0 * b10 + a1 * b9 + a2 * b8 + a3 * b7 + a4 * b6 + a5 * b5 +2979        //        a6 * b4 + a7 * b3 + a8 * b2 + a9 * b1 + a10 * b0;2980        //    s11 = a0 * b11 + a1 * b10 + a2 * b9 + a3 * b8 + a4 * b7 + a5 * b6 +2981        //        a6 * b5 + a7 * b4 + a8 * b3 + a9 * b2 + a10 * b1 + a11 * b0;2982        //    s12 = a1 * b11 + a2 * b10 + a3 * b9 + a4 * b8 + a5 * b7 + a6 * b6 +2983        //        a7 * b5 + a8 * b4 + a9 * b3 + a10 * b2 + a11 * b1;2984        //    s13 = a2 * b11 + a3 * b10 + a4 * b9 + a5 * b8 + a6 * b7 + a7 * b6 +2985        //        a8 * b5 + a9 * b4 + a10 * b3 + a11 * b2;2986        //    s14 = a3 * b11 + a4 * b10 + a5 * b9 + a6 * b8 + a7 * b7 + a8 * b6 +2987        //        a9 * b5 + a10 * b4 + a11 * b3;2988        //    s15 = a4 * b11 + a5 * b10 + a6 * b9 + a7 * b8 + a8 * b7 + a9 * b6 +2989        //        a10 * b5 + a11 * b4;2990        //    s16 =2991        //        a5 * b11 + a6 * b10 + a7 * b9 + a8 * b8 + a9 * b7 + a10 * b6 + a11 * b5;2992        //    s17 = a6 * b11 + a7 * b10 + a8 * b9 + a9 * b8 + a10 * b7 + a11 * b6;

Changelog

Unchanged from 6.7.7 through 7.1.0.

1. 6.7.7
2. 6.8.8
3. 6.9.7
4. 7.0.4
5. 7.1.0

Signature, return type and hooks compared across 5 parsed releases.

About this page

Parsed data

Generated from the wordpress-develop 7.1.0 tag, from src/wp-includes/sodium_compat/src/Core/Curve25519.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.

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