Class Nettle.SHA256()->HMAC.SHA256
- Description
 The HMAC hash state.
- Method
create
 Nettle.SHA256.HMAC.SHA256 Nettle.SHA256.HMAC.SHA256(string(8bit)passwd,void|intb)- Parameter 
passwd The secret password (K).
- Parameter 
b Block size. Must
0(zero) or equal to the block_size().