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From:   "Bhat, Jayalakshmi Manjunath" <jayalakshmi.bhat@hp.com>
To:     Stephan Mueller <smueller@chronox.de>,
        "linux-crypto@vger.kernel.org" <linux-crypto@vger.kernel.org>
Subject: RE: Information required on how to provide reseed input to DRBG
Thread-Topic: Information required on how to provide reseed input to DRBG
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Date:   Thu, 13 Aug 2020 15:56:49 +0000
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Hi Stephen,

Thanks you very much on the response. I actually went through the code that=
 you mentioned. My question is on inputting reseed. Example input I have is=
 something like this

"entropyInput" : "F929692DF52BC06878F67A4DBC76471C03981B987FF09BF7E29C18AD6=
F7F8397",
"nonce" : "8DB5A7ECEC06078C1C41D2C80AB6CB5EDFE00EA7B1AA6F4F907E80C9BAA008CE=
",
"persoString" : "C99B39DD7B8FB0F772",
"otherInput" :=20
=09 {
=09=09"intendedUse" : "reSeed",
=09        =09"additionalInput" :  "32ED729CD8FCC001B6B2703F0DBE04D5EED127A=
615212FEC967566ABBFBC8913027D ",
=09=09"entropyInput" : "6FE46781AF69B38550A4D2C3888C8E515D28A2A4F141A041F3E=
2E9A753E46A30"
     =09 },=20
=09 {
=09=09"intendedUse" : "generate",
=09=09 "additionalInput" : "3C758EC9ECFD905E5865FD8343556815FBD8A064846252C=
BC161BFEAAC4FA9AF4D0DB8D8B9FD2E06B2C7A3FD55",
=09        =09"entropyInput" : ""
=09},=20
=09{
=09=09"intendedUse" : "generate",
=09=09"additionalInput" : "8F8F3F52D2CEF7FA788E984DA152ECA82CF0493E37985E38=
7B3CFCEC2639F610431CA0A81F740C4CD65230DD291733",
        =09=09"entropyInput" : ""
=09}

I understood=20
how to use " entropyInput", " nonce" and " persoString".=20
how to use " additionalInput" and " entropyInput" from generate section.=20
My question is how to I use " additionalInput" and " entropyInput" from reS=
eed section.=20

I could see only below APIs available to set the values.
crypto_drbg_get_bytes_addtl_test { crypto_rng_set_entropy, crypto_rng_gener=
ate)
crypto_drbg_reset_test {crypto_rng_set_entropy, crypto_rng_reset}
crypto_drbg_get_bytes_addtl { crypto_rng_generate)

I am not seeing any API to input reseed values or to trigger reseed? =20

Regards,
Jaya


-----Original Message-----
From: linux-crypto-owner@vger.kernel.org <linux-crypto-owner@vger.kernel.or=
g> On Behalf Of Stephan Mueller
Sent: Thursday, August 13, 2020 8:48 PM
To: linux-crypto@vger.kernel.org; Bhat, Jayalakshmi Manjunath <jayalakshmi.=
bhat@hp.com>
Subject: Re: Information required on how to provide reseed input to DRBG

Am Donnerstag, 13. August 2020, 11:01:27 CEST schrieb Bhat, Jayalakshmi
Manjunath:

Hi Jayalakshmi,

> Hi All,
>=20
> I could successfully execute the CAVS test for DRBG with=20
> ""predResistanceEnabled" : true" reseedImplemented": false.
>=20
> I am trying to execute the tests with "predResistanceEnabled" : false;=20
> "reseedImplemented" : true. But not successful.
>=20
> Can anyone please let me know how to provide reseed data to DRBG?

See, for example, how drbg_nopr_sha256_tv_template is processed with
drbg_cavs_test()
>=20
> Regards.
> Jayalakshmi


Ciao
Stephan