.. _aesdecryptcbc:


AESDecryptCBC
=============


Decrypts byte data stream according to AES in the CBC mode.


Syntax
------


IppStatus ippsAESDecryptCBC(const Ipp8u\* pSrc, Ipp8u\* pDst, int len,
const IppsAESSpec\* pCtx, const Ipp8u\* pIV);


Include Files
-------------


``ippcp.h``


Parameters
----------


.. list-table:: 
   :header-rows: 0

   * - pSrc   
     - Pointer to the input ciphertext data stream.
   * - pDst   
     - Pointer to the resulting plaintext data stream of the variable length.
   * - len   
     - Length of the ciphertext data stream length in bytes.
   * - pCtx   
     - Pointer to the IppsAESSpec context.
   * - pIV   
     - Pointer to the initialization vector for CBC mode operation.




Description
-----------


The function decrypts the input data stream of a variable length
according to the CBC mode as specified in [`NIST SP
800-38A <bibliography.html>`__].


Return Values
-------------


.. list-table:: 
   :header-rows: 0

   * - ippStsNoErr   
     - Indicates no error. Any other value indicates an error or warning.
   * - ippStsNullPtrErr   
     - Indicates an error condition if any of the specified pointers is NULL.
   * - ippStsLengthErr   
     - Indicates an error condition if the output data stream length is less than or equal to zero.
   * - ippStsContextMatchErr   
     - Indicates an error condition if the context parameter does not match the operation.
   * - ippStsUnderRunErr   
     - Indicates an error condition if len is not divisible by cipher block size.