AESDecryptCBC

Developer Reference for Intel® Integrated Performance Primitives Cryptography

Decrypts plaintext in the CBC ciphertext stealing mode of the AES block cipher.

Syntax

IppStatus ippsAESDecryptCBC_CS1(const Ipp8u* pSrc, Ipp8u* pDst, int len, const IppsAESSpec* pCtx, const Ipp8u* pIV);

IppStatus ippsAESDecryptCBC_CS2(const Ipp8u* pSrc, Ipp8u* pDst, int len, const IppsAESSpec* pCtx, const Ipp8u* pIV);

IppStatus ippsAESDecryptCBC_CS3(const Ipp8u* pSrc, Ipp8u* pDst, int len, const IppsAESSpec* pCtx, const Ipp8u* pIV);

Include Files

ippcp.h

Parameters

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

Description

These functions decrypt the input data stream according to the three variants of the Cipher Block Chaining (CBC) mode with Ciphertext Stealing (CS), as specified in [NIST SP 800-38A A.].

Return Values

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	For AESDecryptCBC_CS1 and AESDecryptCBC_CS2, indicates an error condition if the input data length is less than the cipher block size. For AESDecryptCBC_CS3, indicates an error condition if the input data length is less than or equal to the cipher block size.
ippStsContextMatchErr	Indicates an error condition if the context parameter does not match the operation.