Cryptography for Intel(R) Integrated Performance Primitives Developer Reference

ID 768738
Date 12/16/2022
Public
Document Table of 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.

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