ParagonIE_Sodium_Core32_ChaCha20_Ctx::__construct

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Summery Summery

ParagonIE_Sodium_Core_ChaCha20_Ctx constructor.

Syntax Syntax

ParagonIE_Sodium_Core32_ChaCha20_Ctx::__construct( string $key = '', string $iv = '', string $counter = '' )

Parameters Parameters

$key

(string) (Optional) ChaCha20 key.

Default value: ''

$iv

(string) (Optional) Initialization Vector (a.k.a. nonce).

Default value: ''

$counter

(string) (Optional) The initial counter value. Defaults to 8 0x00 bytes.

Default value: ''

Source Source

File: wp-includes/sodium_compat/src/Core32/ChaCha20/Ctx.php

    public function __construct($key = '', $iv = '', $counter = '')
    {
        if (self::strlen($key) !== 32) {
            throw new InvalidArgumentException('ChaCha20 expects a 256-bit key.');
        }
        if (self::strlen($iv) !== 8) {
            throw new InvalidArgumentException('ChaCha20 expects a 64-bit nonce.');
        }
        $this->container = new SplFixedArray(16);

        /* "expand 32-byte k" as per ChaCha20 spec */
        $this->container[0]  = new ParagonIE_Sodium_Core32_Int32(array(0x6170, 0x7865));
        $this->container[1]  = new ParagonIE_Sodium_Core32_Int32(array(0x3320, 0x646e));
        $this->container[2]  = new ParagonIE_Sodium_Core32_Int32(array(0x7962, 0x2d32));
        $this->container[3]  = new ParagonIE_Sodium_Core32_Int32(array(0x6b20, 0x6574));

        $this->container[4]  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 0, 4));
        $this->container[5]  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 4, 4));
        $this->container[6]  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 8, 4));
        $this->container[7]  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 12, 4));
        $this->container[8]  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 16, 4));
        $this->container[9]  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 20, 4));
        $this->container[10] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 24, 4));
        $this->container[11] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 28, 4));

        if (empty($counter)) {
            $this->container[12] = new ParagonIE_Sodium_Core32_Int32();
            $this->container[13] = new ParagonIE_Sodium_Core32_Int32();
        } else {
            $this->container[12] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($counter, 0, 4));
            $this->container[13] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($counter, 4, 4));
        }
        $this->container[14] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($iv, 0, 4));
        $this->container[15] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($iv, 4, 4));
    }

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