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Wed, 11 Sep 2019 19:34:31 +0000 From: Pascal Van Leeuwen To: Eric Biggers , Pascal van Leeuwen CC: "linux-crypto@vger.kernel.org" , "antoine.tenart@bootlin.com" , "herbert@gondor.apana.org.au" , "davem@davemloft.net" Subject: RE: [PATCH 4/7] crypto: testmgr - Added testvectors for the ofb(sm4) & cfb(sm4) skciphers Thread-Topic: [PATCH 4/7] crypto: testmgr - Added testvectors for the ofb(sm4) & cfb(sm4) skciphers Thread-Index: AQHVaJXTG1IIcgClVUajVRoPFqk+JKcmpF4AgAA2P7A= Date: Wed, 11 Sep 2019 19:34:31 +0000 Message-ID: References: <1568198304-8101-1-git-send-email-pvanleeuwen@verimatrix.com> <1568198304-8101-5-git-send-email-pvanleeuwen@verimatrix.com> <20190911160545.GA210122@gmail.com> In-Reply-To: <20190911160545.GA210122@gmail.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=pvanleeuwen@verimatrix.com; x-originating-ip: [188.204.2.113] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: fb742163-e2cc-4ecb-19d1-08d736ef1184 x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600166)(711020)(4605104)(1401327)(2017052603328)(7193020);SRVR:MN2PR20MB2367; 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charset="Windows-1252" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: verimatrix.com X-MS-Exchange-CrossTenant-Network-Message-Id: fb742163-e2cc-4ecb-19d1-08d736ef1184 X-MS-Exchange-CrossTenant-originalarrivaltime: 11 Sep 2019 19:34:31.1530 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: dcb260f9-022d-4495-8602-eae51035a0d0 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: cI6ro4DUdQ2fNtBvJhSZHPR4/v5SmsR+yuSuRbkfcK09dhkVkGb11Hvs3ijRuZcu5YE2o+NuoilTenn54xb9EPxU1xH+JpHExjKP/30VgAM= X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR20MB2367 Sender: linux-crypto-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org > -----Original Message----- > From: Eric Biggers > Sent: Wednesday, September 11, 2019 6:06 PM > To: Pascal van Leeuwen > Cc: linux-crypto@vger.kernel.org; antoine.tenart@bootlin.com; herbert@gon= dor.apana.org.au; > davem@davemloft.net; Pascal Van Leeuwen > Subject: Re: [PATCH 4/7] crypto: testmgr - Added testvectors for the ofb(= sm4) & cfb(sm4) > skciphers >=20 > On Wed, Sep 11, 2019 at 12:38:21PM +0200, Pascal van Leeuwen wrote: > > Added testvectors for the ofb(sm4) and cfb(sm4) skcipher algorithms > > >=20 > What is the use case for these algorithms? Who/what is going to use them= ? >=20 > - Eric > SM4 is a Chinese replacement for 128 bit AES, which is mandatory to be used= for many Chinese use cases. So they would use these whereever you would normally use= ofb(aes) or cfb(aes). Frankly, I'm not aware of any practicle use cases for these fe= edback modes, but we've been supporting them for decades and apparently the Crypto= API supports them for AES as well. So they must be useful for something ... The obvious advantage over CBC mode was that they only require the encrypt = part of the cipher, but that holds for the (newer) CTR mode as well. So, my guess w= ould be some legacy uses cases from before the time CTR mode and AEAD's became popu= lar. Maybe someone remembers why these were added for AES in the first place? Regards, Pascal van Leeuwen Silicon IP Architect, Multi-Protocol Engines @ Verimatrix www.insidesecure.com