Developer Reference

Contents

AESDecryptCTR

Decrypts a variable length data stream in the CTR mode.

Syntax

IppStatus ippsAESDecryptCTR(const Ipp8u
* pSrc
, Ipp8u
* pDst
, int
srcLen
,
const
IppsAESSpec
* pCtx
, Ipp8u
* pCtrValue
, int
ctrNumBitSize
);
Include Files
ippcp.h
Parameters
pSrc
Pointer to the input ciphertext data stream.
pDst
Pointer to the resulting plaintext data stream of a variable length.
srcLen
Length of the plaintext data stream in bytes.
pCtx
Pointer to the
IppsAESSpec
context.
pCtrValue
Pointer to the counter data block.
ctrNumBitSize
Number of bits in the specific part of the counter to be incremented.
Description
The function decrypts the input data stream of a variable length according to the CTR mode as specified in the [NIST SP 800-38A].
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
Indicates an error condition if the output data stream length is less than or equal to zero.
ippStsCTRSizeErr
Indicates an error condition if the value of the
ctrNumBitSize
is illegal.
ippStsContextMatchErr
Indicates an error condition if the context parameter does not match the operation.

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.