libmcrypt usage

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Can anyone tell me what the equivalent to the following command line
usage of openssl is, in php using the mcrypt_* functions, please:
,----
| openssl enc -e -aes-256-cbc -k <some key> ...
`----

TIA.

I tried
,----
|         $iv = mcrypt_create_iv(mcrypt_get_block_size(MCRYPT_RIJNDAEL_256,
|                                                      MCRYPT_MODE_CBC),
|                                MCRYPT_DEV_RANDOM);
|         $encryptedData = mcrypt_cbc(MCRYPT_RIJNDAEL_256
|                                     ,$passphrase
|                                     ,$data
|                                     ,MCRYPT_ENCRYPT
|                                     ,$iv);
`----
amongst other things, but it doesn't work, I get "bad magic number"
when I tried to decrypt the contents of $encryptedData using
,----
| openssl enc -d -aes-256-cbc -k <passphrase> ...
`----

Yeah, bad magic number, naughty magic number, go and stand in the
corner. Seriously. WTH is that supposed to mean?!

I also tried not using an iv but mcrypt slapped my wrist for trying it.

-- 
Gary        Please do NOT send me 'courtesy' replies off-list.
PHP 5.2.12 (cli) (built: Jan 14 2010 14:54:11)
1.7.7(0.230/5/3) 2010-08-31 09:58 Cygwin


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