HMAC SHA256 result SAP vs Java

Hello

I'm getting different HMAC code for the same input data and secret key comparing CL_ABAP_HMAC=>CALCULATE_HMAC_FOR_CHAR (using SHA256 algorithm) with result of javax.crypto.Mac (using HmacSHA256 algorithm).

Does anyone knows, if algorithms used by those classes are exactly the same. I would suspect that it should be that way, but as I'm getting different hash code in result for the same input I started to doubt. Or maybe I'm doing something wrong?

Thanks for any help

Regards,

Slawek