openssl_decrypt

(PHP 5 >= 5.3.0, PHP 7)

openssl_decrypt — Decrypts data

Description

string openssl_decrypt ( string $data , string $method , string $password [, int $options = 0 [, string $iv = "" ]] )

Takes a raw or base64 encoded string and decrypts it using a given method and key.

Warning

This function is currently not documented; only its argument list is available.

Parameters

data: The data.
method: The cipher method.
password: The password.
options: options can be one of OPENSSL_RAW_DATA, OPENSSL_ZERO_PADDING.
iv: A non-NULL Initialization Vector.

Return Values

The decrypted string on success or FALSE on failure.

Errors/Exceptions

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

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

Changelog

Version	Description
5.3.3	The `iv` parameter was added.
5.4.0	The `raw_output` was changed to `options`.

User Contributed Notes

ittasks at gmail dot com

3 years ago


in case that hosting do not provide openssl_encrypt decrypt functions - it could be mimiced via commad prompt executions  
this functions will check is if openssl is installed and try to use it by default

function sslPrm()
{
 return array("your_password","IV (optional)","aes-128-cbc");
}
function sslEnc($msg)
{
  list ($pass, $iv, $method)=sslPrm();
  if(function_exists('openssl_encrypt'))
     return urlencode(openssl_encrypt(urlencode($msg), $method, $pass, false, $iv));
  else
     return urlencode(exec("echo \"".urlencode($msg)."\" | openssl enc -".urlencode($method)." -base64 -nosalt -K ".bin2hex($pass)." -iv ".bin2hex($iv)));
}
function sslDec($msg)
{
  list ($pass, $iv, $method)=sslPrm();
  if(function_exists('openssl_decrypt'))
     return trim(urldecode(openssl_decrypt(urldecode($msg), $method, $pass, false, $iv)));
  else
     return trim(urldecode(exec("echo \"".urldecode($msg)."\" | openssl enc -".$method." -d -base64 -nosalt -K ".bin2hex($pass)." -iv ".bin2hex($iv))));
}

//example of usage:
$r= sslEnc("This is encryption/decryption test!");
echo "<br>\n".$r.":".sslDec($r);

Anonymous

2 years ago


If your using windows os, do not use the text inside the "file previewer" pane, as this is a truncated version of the actual encrypted string.

Instead, you need to open the file directly and use the contents there.

The error message I had been getting was:
"error:0606506D:digital envelope routines:EVP_DecryptFinal_ex:wrong final block length"