File: src/Symmetric/Config.php

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File: src/Symmetric/Config.php
Role: Class source
Content type: text/plain
Description: Class source
Class: Halite
Perform cryptography operations with libsodium
Author: By
Last change: For version 2, let's use strict types!
Switch passwords and key derivation to crypto_pwhash() (Argon2i)
Merge branch 'v2.0' of https://github.com/paragonie/halite into v2.0

Conflicts:
src/Symmetric/Crypto.php
Date: 5 years ago
Size: 3,721 bytes
 

 

Contents

Class file image Download
<?php
declare(strict_types=1);
namespace
ParagonIE\Halite\Symmetric;

use \
ParagonIE\Halite\{
   
Alerts as CryptoException,
   
Config as BaseConfig
};

final class
Config extends BaseConfig
{
   
/**
     * Get the configuration
     *
     * @param string $header
     * @param string $mode
     * @return \ParagonIE\Halite\Config
     * @throws CryptoException\InvalidMessage
     */
   
public static function getConfig(
       
string $header,
       
string $mode = 'encrypt'
   
) {
        if (\
ord($header[0]) !== 49 || \ord($header[1]) !== 66) {
            throw new
CryptoException\InvalidMessage(
               
'Invalid version tag'
           
);
        }
       
$major = \ord($header[2]);
       
$minor = \ord($header[3]);
        if (
$mode === 'encrypt') {
            return new
Config(
               
self::getConfigEncrypt($major, $minor)
            );
        } elseif (
$mode === 'auth') {
            return new
Config(
               
self::getConfigAuth($major, $minor)
            );
        }
        throw new
CryptoException\InvalidMessage(
           
'Invalid configuration mode: '.$mode
       
);
    }
   
   
/**
     * Get the configuration for encrypt operations
     *
     * @param int $major
     * @param int $minor
     * @return array
     * @throws CryptoException\InvalidMessage
     */
   
public static function getConfigEncrypt(int $major, int $minor): array
    {
        if (
$major === 1) {
            switch (
$minor) {
                case
0:
                    return [
                       
'NONCE_BYTES' => \Sodium\CRYPTO_STREAM_NONCEBYTES,
                       
'HKDF_SALT_LEN' => 32,
                       
'MAC_SIZE' => 32,
                       
'HKDF_SBOX' => 'Halite|EncryptionKey',
                       
'HKDF_AUTH' => 'AuthenticationKeyFor_|Halite'
                   
];
            }
        } elseif (
$major === 2) {
            switch (
$minor) {
                case
0:
                    return [
                       
'NONCE_BYTES' => \Sodium\CRYPTO_STREAM_NONCEBYTES,
                       
'HKDF_SALT_LEN' => 32,
                       
'MAC_SIZE' => 32,
                       
'HKDF_SBOX' => 'Halite|EncryptionKey',
                       
'HKDF_AUTH' => 'AuthenticationKeyFor_|Halite'
                   
];
            }
        }
        throw new
CryptoException\InvalidMessage(
           
'Invalid version tag'
       
);
    }
   
   
/**
     * Get the configuration for seal operations
     *
     * @param int $major
     * @param int $minor
     * @return array
     * @throws CryptoException\InvalidMessage
     */
   
public static function getConfigAuth(int $major, int $minor): array
    {
        if (
$major === 1) {
            switch (
$minor) {
                case
0:
                    return [
                       
'HKDF_SALT_LEN' => 32,
                       
'MAC_SIZE' => 32,
                       
'PUBLICKEY_BYTES' => \Sodium\CRYPTO_BOX_PUBLICKEYBYTES,
                       
'HKDF_SBOX' => 'Halite|EncryptionKey',
                       
'HKDF_AUTH' => 'AuthenticationKeyFor_|Halite'
                   
];
            }
        } elseif (
$major === 2) {
            switch (
$minor) {
                case
0:
                    return [
                       
'HKDF_SALT_LEN' => 32,
                       
'MAC_SIZE' => 32,
                       
'PUBLICKEY_BYTES' => \Sodium\CRYPTO_BOX_PUBLICKEYBYTES,
                       
'HKDF_SBOX' => 'Halite|EncryptionKey',
                       
'HKDF_AUTH' => 'AuthenticationKeyFor_|Halite'
                   
];
            }
        }
        throw new
CryptoException\InvalidMessage(
           
'Invalid version tag'
       
);
    }
}


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