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From:   Stephan Mueller <smueller@chronox.de>
To:     "linux-crypto@vger.kernel.org" <linux-crypto@vger.kernel.org>,
        "Bhat, Jayalakshmi Manjunath" <jayalakshmi.bhat@hp.com>
Subject: Re: Information required on how to provide reseed input to DRBG
Date:   Fri, 14 Aug 2020 18:42:38 +0200
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Am Donnerstag, 13. August 2020, 17:56:49 CEST schrieb Bhat, Jayalakshmi 
Manjunath:

Hi Jayalakshmi,

> 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" :
> "F929692DF52BC06878F67A4DBC76471C03981B987FF09BF7E29C18AD6F7F8397", "nonce"
> : "8DB5A7ECEC06078C1C41D2C80AB6CB5EDFE00EA7B1AA6F4F907E80C9BAA008CE",
> "persoString" : "C99B39DD7B8FB0F772",
> "otherInput" :
> 	 {
> 		"intendedUse" : "reSeed",
> 	        	"additionalInput" : 
> "32ED729CD8FCC001B6B2703F0DBE04D5EED127A615212FEC967566ABBFBC8913027D ",
> "entropyInput" :
> "6FE46781AF69B38550A4D2C3888C8E515D28A2A4F141A041F3E2E9A753E46A30" },
> 	 {
> 		"intendedUse" : "generate",
> 		 "additionalInput" :
> "3C758EC9ECFD905E5865FD8343556815FBD8A064846252CBC161BFEAAC4FA9AF4D0DB8D8B9
> FD2E06B2C7A3FD55", "entropyInput" : ""
> 	},
> 	{
> 		"intendedUse" : "generate",
> 		"additionalInput" :
> "8F8F3F52D2CEF7FA788E984DA152ECA82CF0493E37985E387B3CFCEC2639F610431CA0A81F
> 740C4CD65230DD291733", "entropyInput" : ""
> 	}

Here is my code for that:


drbg_string_fill(&testentropy, entropyreseed->data,
				 entropyreseed->len);
drbg_string_fill(&addtl, addtlreseed->data, addtlreseed->len);
ret = crypto_drbg_reset_test(drng, &addtl, &test_data);

> 
> I understood
> how to use " entropyInput", " nonce" and " persoString".
> how to use " additionalInput" and " entropyInput" from generate section.
> My question is how to I use " additionalInput" and " entropyInput" from
> reSeed section.
> 
> I could see only below APIs available to set the values.
> crypto_drbg_get_bytes_addtl_test { crypto_rng_set_entropy,
> crypto_rng_generate) 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?
> 
> Regards,
> Jaya
> 
> 
> -----Original Message-----
> From: linux-crypto-owner@vger.kernel.org
> <linux-crypto-owner@vger.kernel.org> 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,
> > 
> > I could successfully execute the CAVS test for DRBG with
> > ""predResistanceEnabled" : true" reseedImplemented": false.
> > 
> > I am trying to execute the tests with "predResistanceEnabled" : false;
> > "reseedImplemented" : true. But not successful.
> > 
> > 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()
> 
> > Regards.
> > Jayalakshmi
> 
> Ciao
> Stephan


Ciao
Stephan