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Fri, 15 May 2020 11:00:02 +0000 (GMT) From: Lukasz Stelmach To: Stephan Mueller Subject: Re: [PATCH 1/2] hwrng: iproc-rng200 - Set the quality value Date: Fri, 15 May 2020 12:59:45 +0200 Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux) MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA01SWUwTURTN6ywd0ZKxaHqDRmPVKBrBLfrEJZIQMzFx+dOYiFYZcWGKaQH3 gBvYVlBrUBlFURQQpMVSi4BSbARElLpQ9QNtYnGhoNQ1iqJSpyb+nXvOPefde/MYQnmWjmQ2 aVN5nVaTrKbDSEfTd/eU6en1CVPtmRNxv7lJjq+eslK4IqeRxG5DCYH73t+W4/1FVhqb/CPx EV83gd3uSjm2+Z5Q2Pviuww/rj1D41PuehkuPN5J4UJHLsKv8qto/L68E+G81goSN98xEAsj uB99ZsSJ3vs097G9XcbViM/lXJHNSXOOhvGcrcxAc86CK3Ku6mIGl2svQ1xuVyXirHYPye27 m01xn2yjloevCpuXyCdvSud1MQvWhm00e2+RWxvY7fliI52JbiqMaBAD7EzwfvwiN6IwRsmW Ivga6KGk4jMCa9leUio+Iei/94H6Zzlw7GlIKEHQ7amTScUbBCWGLNqIGIZmo6GiYmXQMIyN Ak/2OTrYQ7BtFPw8/YgIChFsPDwyHZMFMcmOh9sBHwpiBTsbTOW//vLD2Tlgf+uVS/xQaMnv JIOYYAXId/egYCiw7Qw4C0RSGi8ebpmqaQlHgL/ZLpfwSPhdc04WHA7YDDhuniV5DyNwnPkW 8s6Fjra+kDcOmqrbKak/HJ69Gyq9Gw5mx0lCohVwKEspdY8Dy5EboZRIyPGXIglz0N3yJnSs gwiKruWho2i0+N864n/riAOxxMC9rLUxEj0Zis93ExKeDxZLL1mIqDKk4tP0QhKvn6Hlt0Xr NYI+TZsUvT5FsKGBn9r6q/nLdVT/c50LsQxSD1FMzbuZoKQ06fodgguNG0h6WVn+AEWS2hQt rx6mWGqtS1AqEjU7dvK6lDW6tGRe70IjGFKtUsy40LVaySZpUvktPL+V1/1TZcygyExU2e+L Kn6sEvY9VMUleLZvjnDGioIpgH/HrO1ackdY3nEpLjsjs4UmFxurVlxLK73/Whjjik111rge pgcsBcuMs817L1yP2d3aZun84fP37rnR9dVbd7Bjg7txcrVoCkwakbUzcd2iE3G1Pt/gCbHz 4nsKZqkacsZe7t3V4jH4P6tJ/UbNtEmETq/5A2h510axAwAA X-Brightmail-Tracker: H4sIAAAAAAAAA02Se0hTYRjG+XYum8vl5zT8GCE2NKho80xt3yKrP4wOhFEUYTdt6EFDt8k5 m2V/VKRhalkalg5Fwy6ozdk08ZJzmrcysTIXXUxJpbKoKLLSijZH0H8Pz/N7X94XHgkhL6UU ksNGM8cb9RlKWkoO/RkYX6vJciZG3jgbgH+X9IvxrTI7hW3n+kg8kn+DwPMfe8U4p8ZO48LZ 5fj81HsCj4w0irFjyk3hiVc/RXi0vYLGZSNOEa6+OE3h6pYigGfKm2j8sX4a4NIhG4kHBvOJ zUHswnwJYK0TwzT75ckTEdtmHRezNY4umm1xRbCOunya7aq8KWabrp5gi5rrAFv0rhGw9uYx kj11P49ivzpCdyzdp9rAmyxmLizNJJhjlfsZrFExOqzSROtUTJT24HpNjFK9cUMKl3E4i+PV Gw+p0komuslMFzxabu2jT4JOWQHwkyAYjXKLn5IFQCqRw2sAvbS1ggIg8QQKVFuZ6mOC0C93 Ae1jZgA6/XyS9DI0VCGbLcHLBMNVaCyvapEhYDuFXhS6KW8QBOPQ48JikVfLIYM6F7pJryZh BOr9PAW8Wga1qLD+zyKzDOpQ89sJsc8PRPfKpxd5Aqajb/VviAsgwPpfZP0vsnpOIjx32NvV PnsNun7lPeHTsaih4RNZDag6EMxZBEOqQWBUgt4gWIypqmSTwQE8NWjp/9nUCh7f2tUDoAQo /WWRpZ2JckqfJWQbekC4Z83rxvqHQEEaTUZOGSzbbu9IlMtS9NnHON6UxFsyOKEHxHh+KyYU y5JNnoIZzUlMDKPFOkYbpY1ah5UhsjOw+4AcpurNXDrHZXL8vzmRxE9xElQNDCbowyyjqCOn xT+EyRX7P+/YUxuR65JOzQ1u6bhs3Dr8fVZ7ZLc7+nhzReylOF7qRKN3wrcNb74b6qxR971b oJLIZ2Od+9xu16sZ+MHv0e0U197c8DyncsXKedeHyXjFjyX3s+Gk1BD64LV2VpfJnw1Ma2ib uxKrjtfs3KQkhTQ9s5rgBf1fexr2PigDAAA= X-CMS-MailID: 20200515110002eucas1p136759396d9b61f214d1f14856c009501 X-Msg-Generator: CA X-RootMTR: 20200515110002eucas1p136759396d9b61f214d1f14856c009501 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200515110002eucas1p136759396d9b61f214d1f14856c009501 References: <3640422.T8yoyu11Ch@tauon.chronox.de> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200515_040006_718814_BE68132F X-CRM114-Status: GOOD ( 17.38 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Florian Fainelli , Herbert Xu , Scott Branden , Matthias Brugger , Greg Kroah-Hartman , Matt Mackall , linux-kernel@vger.kernel.org, Krzysztof Kozlowski , linux-samsung-soc@vger.kernel.org, Bartlomiej Zolnierkiewicz , Kukjin Kim , Arnd Bergmann , Stefan Wahren , Ray Jui , bcm-kernel-feedback-list@broadcom.com, Markus Elfring , linux-arm-kernel@lists.infradead.org, linux-crypto@vger.kernel.org Content-Type: multipart/mixed; boundary="===============8858186013719015508==" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org --===============8858186013719015508== Content-Type: multipart/signed; boundary="=-=-="; micalg="pgp-sha256"; protocol="application/pgp-signature" --=-=-= Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable It was <2020-05-15 pi=C4=85 11:10>, when Stephan Mueller wrote: > As I mentioned, all that is or seems to be analyzed here is the > quality of the cryptographic post-processing. Thus none of the data > can be used for getting an idea of the entropy content. > > That said, the ent value indeed looks too low which seems to be an > issue in the tool itself. > > Note, for an entropy assessment commonly at least 1 million traces > from the raw noise source are needed. I've got 1MiB from each source. Of course I used raw data from /dev/hwrng for tpm, exynos and rng200. | Source | ea_iid -i | ea_iid -c (h') | ent | |--------------+-----------+----------------+----------| | /dev/random | 7.875064 | 0.998166 | 7.999801 | | /dev/urandom | 7.879351 | 0.998373 | 7.999821 | | tpm-rng | 7.880012 | 0.998118 | 7.999828 | | exynos-trng | 7.435701 | 0.947574 | 7.991820 | | rng200 | 7.883320 | 0.998592 | 7.999824 | > See for examples on how such entropy assessments are conducted in the LRN= G=20 > documentation [1] or the Linux /dev/random implementation in [2] Thanks a lot, I am reading. I will try to write somthing clever as soon as I parse and understand these documents (and do other stuff too). Thank you very much for your help. Kind regards, =2D-=20 =C5=81ukasz Stelmach Samsung R&D Institute Poland Samsung Electronics --=-=-= Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEXpuyqjq9kGEVr9UQsK4enJilgBAFAl6+diIACgkQsK4enJil gBC/FQgAl9V5sUO9+a2EU1F1GXcue3fCC/itZ51mkOzD/1FjoM/tCPmsd3cVlfm8 aiJxFzyQoZ8KqLSfZ+ccmg1XnMCrfc/MPUBqWznbtGeUKx/9esy9mx9PzU+1lZhm 9BCYRnHqyUh+6nJo3hkNYErHCfJRhqtsUcYgQ0oesY2pFaDNK2Bbp2owbsKywYlN 8S66mCKhuiFxPAQtEmdn3ftLO29WPdGD9tF+ADWRGEafXGQAG57oSJlWCydXV+9Q krMWf5XwwUgJ7SYQcRgdM2df2hWloZ0xTa3lMPC0i6/8R0u4Jb7AsvLASwLxEGJe 8z+Fu9i/NvLcbuZjrsknq4XpbavSgQ== =HWTY -----END PGP SIGNATURE----- --=-=-=-- --===============8858186013719015508== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel --===============8858186013719015508==--