On Fri, Sep 24, 2021 at 05:27:12PM +0800, Kai Ye wrote:
>
> +static int sec_ahash_import(struct ahash_request *req, const void *in)
> +{
> + /*
> + * Import partial state of the transformation. This function loads the
> + * entire state of the ongoing transformation from a provided block of
> + * data so the transformation can continue from this point onward.
> + */
> + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
> + struct sec_req *sreq = ahash_request_ctx(req);
> + struct sec_ctx *ctx = crypto_ahash_ctx(tfm);
> + const struct sec_ahash_req *state = in;
> +
> + sreq->ctx = ctx;
> + memcpy(&sreq->hash_req, state, sizeof(struct sec_ahash_req));
> +
> + return 0;
> +}
It's still not clear how this function actually works.
Could you please explain how can this work in the following scenario?
x = export_state
reboot_machine
import_state(x)
How do you restore all the internal state so that further data
can be hashed onto the existing hash state after a reboot?
Thanks,
--
Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
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