Messages in this thread | | | Date | Fri, 1 Oct 2021 13:57:45 +0800 | From | Herbert Xu <> | Subject | Re: [PATCH v2 2/6] crypto: hisilicon/sec - add ahash alg features for Kunpeng920 |
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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@gondor.apana.org.au> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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