sha2_hc_ctx_t
sha2_hmac_ctx_init(uint_t mech, sha2_hc_ctx_t *ctx, uint64_t *ipad,
void sha2_hmac_ctx_init(uint_t mech, sha2_hc_ctx_t *, uint64_t *, uint64_t *,
sha2_hc_ctx_t sha2_ctx;