SSS_HMAC_SIZE
MUST_HAVE((SSS_HMAC_SIZE == sizeof(shares[0].raw_share_hmac)), ret, err);
len = SSS_HMAC_SIZE;
u8 hmac_val[SSS_HMAC_SIZE];
u8 hmac_val[SSS_HMAC_SIZE];
len = SSS_HMAC_SIZE;
unsigned char raw_share_hmac[SSS_HMAC_SIZE];