(PHP 5 >= 5.3.0)
openssl_encrypt — Encrypts data
$data
, string $method
, string $password
[, bool $raw_output = false
[, string $iv = ""
]] )Encrypts given data with given method and key, returns a raw or base64 encoded string
本函数还未编写文档，仅有参数列表。
data
The data.
method
The cipher method.
password
The password.
raw_output
Setting to TRUE will return as raw output data, otherwise the return
value is base64 encoded.
iv
A non-NULL Initialization Vector.
Returns the encrypted string on success 或者在失败时返回 FALSE.
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.
| 版本 | 说明 |
|---|---|
| 5.3.3 |
The iv parameter was added.
|
biohazard dot ge at gmail dot com (15-Jun-2011 02:48)
Many users give up with handilng problem when openssl command line tool cant decrypt php openssl encrypted file which is encrypted with openssl_encrypt function.
For example how beginner is encrypting data:
<?php
$string = 'It works ? Or not it works ?';
$pass = '1234';
$method = 'aes128';
file_put_contents ('./file.encrypted', openssl_encrypt ($string, $method, $pass));
?>
And then how beginner is trying to decrypt data from command line:
# openssl enc -aes-128-cbc -d -in file.encrypted -pass pass:123
Or even if he/she determinates that openssl_encrypt output was base64 and tries:
# openssl enc -aes-128-cbc -d -in file.encrypted -base64 -pass pass:123
Or even if he determinates that base64 encoded file is represented in one line and tries:
# openssl enc -aes-128-cbc -d -in file.encrypted -base64 -A -pass pass:123
Or even if he determinates that IV is needed and adds some string iv as encryption function`s fourth parameter and than adds hex representation of iv as parameter in openssl command line :
# openssl enc -aes-128-cbc -d -in file.encrypted -base64 -pass pass:123 -iv -iv 31323334353637383132333435363738
Or even if he determinates that aes-128 password must be 128 bits there fore 16 bytes and sets $pass = '1234567812345678' and tries:
# openssl enc -aes-128-cbc -d -in file.encrypted -base64 -pass pass:1234567812345678 -iv -iv 31323334353637383132333435363738
All these troubles will have no result in any case.
BECAUSE THE PASSWORD PARAMETER DOCUMENTED HERE IS NOT THE PASSWORD.
It means that the password parameter of the function is not the same string used as [-pass pass:] parameter with openssl cmd tool for file encryption decryption.
IT IS THE KEY !
And now how to correctly encrypt data with php openssl_encrypt and how to correctly decrypt it from openssl command line tool.
<?php
function strtohex($x)
{
$s='';
foreach (str_split($x) as $c) $s.=sprintf("%02X",ord($c));
return($s);
}
$source = 'It works !';
$iv = "1234567812345678";
$pass = '1234567812345678';
$method = 'aes-128-cbc';
echo "\niv in hex to use: ".strtohex ($iv);
echo "\nkey in hex to use: ".strtohex ($pass);
echo "\n";
file_put_contents ('./file.encrypted',openssl_encrypt ($source, $method, $pass, true, $iv));
$exec = "openssl enc -".$method." -d -in file.encrypted -nosalt -nopad -K ".strtohex($pass)." -iv ".strtohex($iv);
echo 'executing: '.$exec."\n\n";
echo exec ($exec);
echo "\n";
?>
IV and Key parameteres passed to openssl command line must be in hex representation of string.
The correct command for decrypting is:
# openssl enc -aes-128-cbc -d -in file.encrypted -nosalt -nopad -K 31323334353637383132333435363738 -iv 31323334353637383132333435363738
As it has no salt has no padding and by setting functions third parameter we have no more base64 encoded file to decode. The command will echo that it works...
: /
public at grik dot net (02-Aug-2010 01:25)
In 5.3.3 they added a new parameter, string $iv (initialization vector)
Real parameters are:
string openssl_encrypt ( string $data , string $method , string $password, bool $raw_output = false, string $iv )
If $iv is missing, a warning is issued: "Using an empty Initialization Vector (iv) is potentially insecure and not recommended".
If $iv is too short, another warning:
"IV passed is only 3 bytes long, cipher expects an IV of precisely 8 bytes, padding with \0"
same IV should be used in openssl_decrypt()
public at grik dot net (25-Dec-2009 05:54)
The list of methods for this function can be obtained with openssl_get_cipher_methods();
The password can be encrypted with the openssl_private/public_encrypt()