EVP_MAC_init() in 3.0 alpha 13
Dr Paul Dale
pauli at openssl.org
Mon Apr 5 21:36:45 UTC 2021
Does EVP_MAC_CTX_dup() after the MAC context has been initialised do
what you want?
On 5/4/21 10:51 pm, Hal Murray wrote:
> It used to take just a ctx. Now it also wants a key+length and a params.
> I have some simple/hack code to time 2 cases. The first gives it the key each
> time. The second preloads the key. That would require an evp per key, but I
> might we willing to make that space/time tradeoff.
> The each time mode of my old code put the cipher and key into a params array,
> then called
> EVP_MAC_CTX_set_params(ctx, params) and then
> That's easy to change. I just drop putting the key into a params slot and
> drop calling set_parms and add the key and parms to EVP_MAC_init. That worked.
> Is there a way to use a preloaded key? I tried using NULL for key and params
> when calling EVP_MAC_init. It compiles and runs but doesn't get the right
> answer. Is that, or something like it supposed to work?
> EVP_MAC_CTX_set_params() seems ugly to me.
> My inner loop looks like:
> I'm trying to make things go fast. It's going to have to do string compares
> to figure out what I want to do. I'm working with small blocks of data (48
> bytes) so the setup cost is important. Or I think it is, so I'm trying to
> measure it.
> The case I'm trying to get working is to move the EVP_MAC_CTX_set_params() out
> of the loop.
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