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ippsHMACSHA1MessageDigest fails with ippStsLengthErr

Ronen_C_
Beginner
‎12-22-2014 07:54 AM
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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!

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Igor_A_Intel
Employee
‎12-22-2014 08:00 AM
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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

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Ronen_C_
Beginner
‎12-22-2014 08:10 AM
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What is the length of the hash value? as i understood its the keyLen, no?

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Igor_A_Intel
Employee
‎12-22-2014 08:21 PM
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HMAC SHA1 is always 160 bit - i.e. 20 bytes, so macLen must be == 20.

regards, Igor

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