<?php
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/*
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* @author: JacksonJeans
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* @email: julian.tietz@gidutex.de
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*/
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namespace DoubleBreak\Spapi;
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class ASECryptoStream
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{
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/**
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* default: 8 fpr PKSC5!
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* - The block size is a property of the used cipher algorithm.
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* For AES it is always 16 bytes. So strictly speaking,
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* PKCS5Padding cannot be used with AES since it is defined only for a block size of 8 bytes.
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*
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* The only difference between these padding schemes is that PKCS7Padding has the block size as a parameter,
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* while for PKCS5Padding it is fixed at 8 bytes. When the Block size is 8 bytes they do exactly the same.
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*
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* - Own implementation through getPaddedText () ;.
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*
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* - https://crypto.stackexchange.com/questions/43489/how-does-aes-ctr-pkcs5padding-works-when-the-bits-to-encrypt-is-more-than-8-bits
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* - https://stackoverflow.com/questions/20770072/aes-cbc-pkcs5padding-vs-aes-cbc-pkcs7padding-with-256-key-size-performance-java/20770158
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*/
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public const BLOCK_SIZE = 8;
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/**
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* default: 16
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* @var int IV_LENGTH
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* - Vector with random data
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*/
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public const IV_LENGTH = 16;
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/**
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* default: AES256
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* @var string CIPHER
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* - Encryption
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*/
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public const CIPHER = 'AES256';
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/**
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* Get padded text
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* @param string $plainText
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* - Plain Text
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* @return string $plainText
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* - padded plain text
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*/
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protected static function getPaddedText(string $plainText): string
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{
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$stringLength = strlen($plainText);
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if ($stringLength % static::BLOCK_SIZE) {
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$plainText = str_pad($plainText, $stringLength + static::BLOCK_SIZE - $stringLength % static::BLOCK_SIZE, "\0");
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}
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return $plainText;
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}
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/**
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* Get encrypted string
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* @param string $plainText [required]
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* - unencrypted text
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* @param string $key [required]
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* - Key to encrypt
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* @param string $iv [required]
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* - The salt value for the block to encrypt.
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* @return string
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* - encrypted string
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*/
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public static function encrypt(string $plainText, string $key, string $iv): string
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{
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$plainText = static::getPaddedText($plainText);
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return openssl_encrypt($plainText, static::CIPHER, $key, OPENSSL_RAW_DATA, $iv);
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}
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/**
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* Get decrypted string
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* @param string $encryptedText
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* - encrypted text
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* @param string $key
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* - Key to decrypt
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* @param string $iv
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* - The salt value for the block to be decrypted.
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* @return string
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* - decrypted string
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*/
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public static function decrypt(string $encryptedText, string $key, string $iv): string
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{
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return openssl_decrypt($encryptedText, static::CIPHER, $key, OPENSSL_RAW_DATA, $iv);
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}
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}
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