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File: src/Core32/HChaCha20.php

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File: src/Core32/HChaCha20.php
Role: Class source
Content type: text/plain
Description: Class source
Class: PHP Sodium Compat
Cryptographic functions of libsodium in pure PHP
Author: By
Last change: Fix docblocks.
Type safety
Date: 11 days ago
Size: 5,297 bytes
 

Contents

Class file image Download
<?php

if (class_exists('ParagonIE_Sodium_Core32_HChaCha20', false)) {
    return;
}

/**
 * Class ParagonIE_Sodium_Core_HChaCha20
 */
class ParagonIE_Sodium_Core32_HChaCha20 extends ParagonIE_Sodium_Core32_ChaCha20
{
   
/**
     * @param string $in
     * @param string $key
     * @param string|null $c
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
   
public static function hChaCha20($in = '', $key = '', $c = null)
    {
       
$ctx = array();

        if (
$c === null) {
           
$ctx[0] = new ParagonIE_Sodium_Core32_Int32(array(0x6170, 0x7865));
           
$ctx[1] = new ParagonIE_Sodium_Core32_Int32(array(0x3320, 0x646e));
           
$ctx[2] = new ParagonIE_Sodium_Core32_Int32(array(0x7962, 0x2d32));
           
$ctx[3] = new ParagonIE_Sodium_Core32_Int32(array(0x6b20, 0x6574));
        } else {
           
$ctx[0] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($c, 0, 4));
           
$ctx[1] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($c, 4, 4));
           
$ctx[2] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($c, 8, 4));
           
$ctx[3] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($c, 12, 4));
        }
       
$ctx[4] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 0, 4));
       
$ctx[5] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 4, 4));
       
$ctx[6] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 8, 4));
       
$ctx[7] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 12, 4));
       
$ctx[8] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 16, 4));
       
$ctx[9] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 20, 4));
       
$ctx[10] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 24, 4));
       
$ctx[11] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 28, 4));
       
$ctx[12] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($in, 0, 4));
       
$ctx[13] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($in, 4, 4));
       
$ctx[14] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($in, 8, 4));
       
$ctx[15] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($in, 12, 4));

        return
self::hChaCha20Bytes($ctx);
    }

   
/**
     * @param array $ctx
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
   
protected static function hChaCha20Bytes(array $ctx)
    {
       
/** @var ParagonIE_Sodium_Core32_Int32 $x0 */
       
$x0 = $ctx[0];
       
/** @var ParagonIE_Sodium_Core32_Int32 $x1 */
       
$x1 = $ctx[1];
       
/** @var ParagonIE_Sodium_Core32_Int32 $x2 */
       
$x2 = $ctx[2];
       
/** @var ParagonIE_Sodium_Core32_Int32 $x3 */
       
$x3 = $ctx[3];
       
/** @var ParagonIE_Sodium_Core32_Int32 $x4 */
       
$x4 = $ctx[4];
       
/** @var ParagonIE_Sodium_Core32_Int32 $x5 */
       
$x5 = $ctx[5];
       
/** @var ParagonIE_Sodium_Core32_Int32 $x6 */
       
$x6 = $ctx[6];
       
/** @var ParagonIE_Sodium_Core32_Int32 $x7 */
       
$x7 = $ctx[7];
       
/** @var ParagonIE_Sodium_Core32_Int32 $x8 */
       
$x8 = $ctx[8];
       
/** @var ParagonIE_Sodium_Core32_Int32 $x9 */
       
$x9 = $ctx[9];
       
/** @var ParagonIE_Sodium_Core32_Int32 $x10 */
       
$x10 = $ctx[10];
       
/** @var ParagonIE_Sodium_Core32_Int32 $x11 */
       
$x11 = $ctx[11];
       
/** @var ParagonIE_Sodium_Core32_Int32 $x12 */
       
$x12 = $ctx[12];
       
/** @var ParagonIE_Sodium_Core32_Int32 $x13 */
       
$x13 = $ctx[13];
       
/** @var ParagonIE_Sodium_Core32_Int32 $x14 */
       
$x14 = $ctx[14];
       
/** @var ParagonIE_Sodium_Core32_Int32 $x15 */
       
$x15 = $ctx[15];

        for (
$i = 0; $i < 10; ++$i) {
           
# QUARTERROUND( x0, x4, x8, x12)
           
list($x0, $x4, $x8, $x12) = self::quarterRound($x0, $x4, $x8, $x12);

           
# QUARTERROUND( x1, x5, x9, x13)
           
list($x1, $x5, $x9, $x13) = self::quarterRound($x1, $x5, $x9, $x13);

           
# QUARTERROUND( x2, x6, x10, x14)
           
list($x2, $x6, $x10, $x14) = self::quarterRound($x2, $x6, $x10, $x14);

           
# QUARTERROUND( x3, x7, x11, x15)
           
list($x3, $x7, $x11, $x15) = self::quarterRound($x3, $x7, $x11, $x15);

           
# QUARTERROUND( x0, x5, x10, x15)
           
list($x0, $x5, $x10, $x15) = self::quarterRound($x0, $x5, $x10, $x15);

           
# QUARTERROUND( x1, x6, x11, x12)
           
list($x1, $x6, $x11, $x12) = self::quarterRound($x1, $x6, $x11, $x12);

           
# QUARTERROUND( x2, x7, x8, x13)
           
list($x2, $x7, $x8, $x13) = self::quarterRound($x2, $x7, $x8, $x13);

           
# QUARTERROUND( x3, x4, x9, x14)
           
list($x3, $x4, $x9, $x14) = self::quarterRound($x3, $x4, $x9, $x14);
        }

        return
$x0->toReverseString() .
           
$x1->toReverseString() .
           
$x2->toReverseString() .
           
$x3->toReverseString() .
           
$x12->toReverseString() .
           
$x13->toReverseString() .
           
$x14->toReverseString() .
           
$x15->toReverseString();
    }
}