   #PHP Manual Mcrypt Encryption Functions mcrypt_generic_end
   mcrypt_generic

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                              mcrypt_generic_init

   (PHP 4 >= 4.0.2)
   mcrypt_generic_init -- This function initializes all buffers needed
   for encryption

Description

   int mcrypt_generic_init ( resource td, string key, string iv)

   The maximum length of the key should be the one obtained by calling
   mcrypt_enc_get_key_size() and every value smaller than this is legal.
   The IV should normally have the size of the algorithms block size, but
   you must obtain the size by calling mcrypt_enc_get_iv_size(). IV is
   ignored in ECB. IV MUST exist in CFB, CBC, STREAM, nOFB and OFB modes.
   It needs to be random and unique (but not secret). The same IV must be
   used for encryption/decryption. If you do not want to use it you
   should set it to zeros, but this is not recommended.

   The function returns a negative value on error, -3 when the key length
   was incorrect, -4 when there was a memory allocation problem and any
   other return value is an unknown error. If an error occurs a warning
   will be displayed accordingly.

   You need to call this function before every call to mcrypt_generic()
   or mdecrypt_generic().

   See for an example mcrypt_module_open() and the entry on
   mcrypt_generic_deinit().
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