openssl_encrypt

(PHP 5 >= 5.3.0, PHP 7)

openssl_encrypt — Encrypts data

Description

openssl_encrypt ( string $data , string $method , string $key [, int $options = 0 [, string $iv = "" [, string &$tag = NULL [, string $aad = "" [, int $tag_length = 16 ]]]]] ) : string|false

Encrypts given data with given method and key, returns a raw or base64 encoded string

Parameters

data: The plaintext message data to be encrypted.
method: The cipher method. For a list of available cipher methods, use openssl_get_cipher_methods().
key: The key.
options: options is a bitwise disjunction of the flags OPENSSL_RAW_DATA and OPENSSL_ZERO_PADDING.
iv: A non-NULL Initialization Vector.
tag: The authentication tag passed by reference when using AEAD cipher mode (GCM or CCM).
aad: Additional authentication data.
tag_length: The length of the authentication tag. Its value can be between 4 and 16 for GCM mode.

Return Values

Returns the encrypted string on success or FALSE on failure.

Errors/Exceptions

Emits an E_WARNING level error if an unknown cipher algorithm is passed in via the method parameter.

Emits an E_WARNING level error if an empty value is passed in via the iv parameter.

Changelog

Version	Description
7.1.0	The `tag`, `aad` and `tag_length` parameters were added.

Examples

Example #1 AES Authenticated Encryption in GCM mode example for PHP 7.1+

<?php//$key should have been previously generated in a cryptographically safe way, like openssl_random_pseudo_bytes$plaintext = "message to be encrypted";$cipher = "aes-128-gcm";if (in_array($cipher, openssl_get_cipher_methods())){ $ivlen = openssl_cipher_iv_length($cipher); $iv = openssl_random_pseudo_bytes($ivlen); $ciphertext = openssl_encrypt($plaintext, $cipher, $key, $options=0, $iv, $tag); //store $cipher, $iv, and $tag for decryption later $original_plaintext = openssl_decrypt($ciphertext, $cipher, $key, $options=0, $iv, $tag); echo $original_plaintext."\n";}?>

Example #2 AES Authenticated Encryption example for PHP 5.6+

<?php//$key previously generated safely, ie: openssl_random_pseudo_bytes$plaintext = "message to be encrypted";$ivlen = openssl_cipher_iv_length($cipher="AES-128-CBC");$iv = openssl_random_pseudo_bytes($ivlen);$ciphertext_raw = openssl_encrypt($plaintext, $cipher, $key, $options=OPENSSL_RAW_DATA, $iv);$hmac = hash_hmac('sha256', $ciphertext_raw, $key, $as_binary=true);$ciphertext = base64_encode( $iv.$hmac.$ciphertext_raw );//decrypt later....$c = base64_decode($ciphertext);$ivlen = openssl_cipher_iv_length($cipher="AES-128-CBC");$iv = substr($c, 0, $ivlen);$hmac = substr($c, $ivlen, $sha2len=32);$ciphertext_raw = substr($c, $ivlen+$sha2len);$original_plaintext = openssl_decrypt($ciphertext_raw, $cipher, $key, $options=OPENSSL_RAW_DATA, $iv);$calcmac = hash_hmac('sha256', $ciphertext_raw, $key, $as_binary=true);if (hash_equals($hmac, $calcmac))//PHP 5.6+ timing attack safe comparison{ echo $original_plaintext."\n";}?>

Php/docs/function.openssl-encrypt

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