43 lines
1.3 KiB
PHP
43 lines
1.3 KiB
PHP
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<?php
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/**
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* simple method to encrypt or decrypt a plain text string
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* initialization vector(IV) has to be the same when encrypting and decrypting
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* PHP 5.4.9
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*
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* Retrieved from:
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* https://naveensnayak.wordpress.com/2013/03/12/simple-php-encrypt-and-decrypt/
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*
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* this is a beginners template for simple encryption decryption
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* before using this in production environments, please read about encryption
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*
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* @param string $action: can be 'encrypt' or 'decrypt'
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* @param string $string: string to encrypt or decrypt
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* @param string $key: encryption key
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* @param string $iv: encryption iv
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*
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* @return string
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*/
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function easy_crypt($action, $string, $key = "Encryption-Key", $iv="What-even-is-an-IV?") {
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$output = false;
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$encrypt_method = "AES-256-CBC";
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$secret_key = $key;
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$secret_iv = $iv;
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// hash
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$key = hash('sha256', $secret_key);
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// iv - encrypt method AES-256-CBC expects 16 bytes - else you will get a warning
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$iv = substr(hash('sha256', $secret_iv), 0, 16);
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if( $action == 'encrypt' ) {
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$output = openssl_encrypt($string, $encrypt_method, $key, 0, $iv);
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$output = base64_encode($output);
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}
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else if( $action == 'decrypt' ){
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$output = openssl_decrypt(base64_decode($string), $encrypt_method, $key, 0, $iv);
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}
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return $output;
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}
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?>
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