.. _aesencryptcfb:


AESEncryptCFB
=============


Encrypts byte data stream according to AES in the CFB mode.


Syntax
------


IppStatus ippsAESEncryptCFB(const Ipp8u\* pSrc, Ipp8u\* pDst, int
srcLen, int cfbBlkSize, const IppsAESSpec\* pCtx, const Ipp8u \*pIV);


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


``ippcp.h``


Parameters
----------


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

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




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


The function encrypts the input data stream of variable length according
to the CFB 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 input data stream length is less than or equal to zero.
   * - ippStsUnderRunErr    
     - Indicates an error condition if srcLenis not divisible by cfbBlkSize parameter value.
   * - ippStsCFBSizeErr    
     - Indicates an error condition if the value for cfbBlkSize is illegal.
   * - ippStsContextMatchErr   
     - Indicates an error condition if the context parameter does not match the operation.