Hermann Lelong f2ef9db988 hashes/sha256: add iterative hmac calc. functions
Add init, update, and final functions to do HMAC
calculation using blocks, instead of one shot.

Unit tests: use the PRF-6 test vector to test the case
where data is splitted in 3 different blocks.
2017-03-01 15:51:21 +01:00
..
2016-12-20 20:42:13 +01:00