ParagonIE_Sodium_Core_ChaCha20_IetfCtx::__construct( string $key = '', string $iv = '', string $counter = '' )
- Source
wp-includes/sodium_compat/src/Core/ChaCha20/IetfCtx.php:24
Compatibility
- WordPress
- core
- PHP
- 7.4–8.6-dev
- 6.7.7
- 6.8.8
- 6.9.7
- 7.0.4
- 7.1.0
Present in every tracked release (6.7.7 to 7.1.0), and compiles on PHP 7.4 through 8.6-dev.
Parameters
$keystringoptional- ChaCha20 key.Default:
'' $ivstringoptional- Initialization Vector (a.k.a. nonce).Default:
'' $counterstringoptional- The initial counter value.
Defaults to 4 0x00 bytes.Default:''
Performance profile
How much work a call to ParagonIE_Sodium_Core_ChaCha20_IetfCtx::__construct() 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
- Trivial
- Scaling
- Constant
- Instructions
- 12–67
- Plugin surface
- None
- Called by
- 4
Touches nothing outside its own arguments.
No loop in the body: the same number of instructions runs whatever you pass in.
Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 71.
Nothing here hands control to plugin code.
4 places in core call this, so the cost is paid more often than your own code shows.
What one call costs · 2 distinct outcomes
One number would be a lie: the work depends on which branch runs. These are every distinct cost ParagonIE_Sodium_Core_ChaCha20_IetfCtx::__construct() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 12 | ::strlen() |
| always | 67 | ::strlen(), ->initCounter(), ::substr(), ::substr(), ::load_4(), ::substr(), ::load_4(), ::substr(), ::load_4(), ::substr(), ::load_4() |
Across PHP versions
Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 71 instructions, 12–67 executed per call, 1 branch. The work does not change between versions.
An instruction is not a fixed amount of time, so a matching count is not necessarily the same speed; what it rules out is a difference in the work itself.
Uses · 6
- ParagonIE_Sodium_Core_ChaCha20_IetfCtx::strlen()
- InvalidArgumentException::__construct()
- ParagonIE_Sodium_Core_ChaCha20_IetfCtx::initCounter()
- ParagonIE_Sodium_Core_ChaCha20_Ctx::__construct()ParagonIE_Sodium_Core_ChaCha20_Ctx constructor.
- ParagonIE_Sodium_Core_ChaCha20_IetfCtx::substr()
- ParagonIE_Sodium_Core_ChaCha20_IetfCtx::load_4()
Used by · 4
Source code
public function __construct($key = '', $iv = '', $counter = '') { if (self::strlen($iv) !== 12) { throw new InvalidArgumentException('ChaCha20 expects a 96-bit nonce in IETF mode.'); } $counter = $this->initCounter($counter); parent::__construct($key, self::substr($iv, 0, 8), $counter); $this->container[12] = self::load_4(self::substr($counter, 0, 4)); $this->container[13] = self::load_4(self::substr($iv, 0, 4)); $this->container[14] = self::load_4(self::substr($iv, 4, 4)); $this->container[15] = self::load_4(self::substr($iv, 8, 4)); }Changelog
Unchanged from 6.7.7 through 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/ChaCha20/IetfCtx.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it. - Corrections
- Something wrong on this page? Report it and it gets fixed in the next regeneration.