
In HMAC_Init_ex, NULL key signals reuse, but in single-shot HMAC, we can allow it to signal an empty key for convenience. Reviewed-by: Viktor Dukhovni <viktor@openssl.org>
In HMAC_Init_ex, NULL key signals reuse, but in single-shot HMAC, we can allow it to signal an empty key for convenience. Reviewed-by: Viktor Dukhovni <viktor@openssl.org>