topic ippsHMACSHA1MessageDigest fails with ippStsLengthErr in Intel® Integrated Performance Primitives

ippsHMACSHA1MessageDigest fails with ippStsLengthErr

Ronen_C_ — Mon, 22 Dec 2014 15:54:27 GMT

Hi,

I'm using the function ippsHMACSHA1MessageDigest(const Ipp8u *pSrcMesg, int mesgLen, const Ipp8u *pKey, int keyLen, Ipp8u *pMAC, int macLen) and it fails with ippStsLengthErr.

The parameters are : mesgLen = 176, keyLen = 20, macLen = 10.

What could be the reason for ippStsLengthErr?

Thanks for the help!

Hi Ronen,

Igor_A_Intel — Mon, 22 Dec 2014 16:00:00 GMT

Hi Ronen,

according to the manual:

ippStsLengthErr - Indicates an error condition if msgLen is less than zero or macLen is less than one or greater than the length of the hash value.

regards, Igor

What is the length of the

Ronen_C_ — Mon, 22 Dec 2014 16:10:07 GMT

What is the length of the hash value? as i understood its the keyLen, no?

HMAC SHA1 is always 160 bit -

Igor_A_Intel — Tue, 23 Dec 2014 04:21:53 GMT

HMAC SHA1 is always 160 bit - i.e. 20 bytes, so macLen must be == 20.

regards, Igor