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Wed, 10 Jun 2020 11:03:55 +0200 (CEST) Subject: Re: [PATCH net v3 3/3] esp, ah: modernize the crypto algorithm selections To: Eric Biggers , netdev@vger.kernel.org Cc: linux-crypto@vger.kernel.org, Corentin Labbe , Greg Kroah-Hartman , Herbert Xu , Steffen Klassert References: <20200610005402.152495-1-ebiggers@kernel.org> <20200610005402.152495-4-ebiggers@kernel.org> From: Tobias Brunner Autocrypt: addr=tobias@strongswan.org; prefer-encrypt=mutual; keydata= xsFNBFNaX0kBEADIwotwcpW3abWt4CK9QbxUuPZMoiV7UXvdgIksGA1132Z6dICEaPPn1SRd BnkFBms+I2mNPhZCSz409xRJffO41/S+/mYCrpxlSbCOjuG3S13ubuHdcQ3SmDF5brsOobyx etA5QR4arov3abanFJYhis+FTUScVrJp1eyxwdmQpk3hmstgD/8QGheSahXj8v0SYmc1705R fjUxmV5lTl1Fbszjyx7Er7Wt+pl+Bl9ReqtDnfBixFvDaFu4/HnGtGZ7KOeiaElRzytU24Hm rlW7vkWxtaHf94Qc2d2rIvTwbeAan1Hha1s2ndA6Vk7uUElT571j7OB2+j1c0VY7/wiSvYgv jXyS5C2tKZvJ6gI/9vALBpqypNnSfwuzKWFH37F/gww8O2cB6KwqZX5IRkhiSpBB4wtBC2/m IDs5VPIcYMCpMIGxinHfl7efv3+BJ1KFNEXtKjmDimu2ViIFhtOkSYeqoEcU+V0GQfn3RzGL 0blCFfLmmVfZ4lfLDWRPVfCP8pDifd3L2NUgekWX4Mmc5R2p91unjs6MiqFPb2V9eVcTf6In Dk5HfCzZKeopmz5+Ewwt+0zS1UmC3+6thTY3h66rB/asK6jQefa7l5xDg+IzBNIczuW6/YtV LrycjEvW98HTO4EMxqxyKAVpt33oNbNfYTEdoJH2EzGYRkyIVQARAQABzSZUb2JpYXMgQnJ1 bm5lciA8dG9iaWFzQHN0cm9uZ3N3YW4ub3JnPsLBqAQTAQgAOwIbAwULCQgHAwUVCgkICwUW AgMBAAIeAQIXgBYhBBJTj49om18fFfB74XZf4mxrRnWEBQJdyUF6AhkBACEJEHZf4mxrRnWE FiEEElOPj2ibXx8V8Hvhdl/ibGtGdYQWaBAAk6rcpSIsUyceYhy7p6gTzfM3KfhILLwRxs9I hsEizE+lp6y02Cjt+SrvQ06QRW8QeQ90PGuT5BF6wMVjwuUt+TKI0JxLmnaTfjpD+laTLFfw 1GU0C7X16a5OFqgI6N5zGfgb5ldV9gEtUYha2jerOyDeGALPON4MnJPXVEeS8Dx/nkghVap3 JGa1jWB4Ugg/8CkKc9m4kiHLEoX+JaStCDv0p2nlDygmF45cRVcYvwr7/XIeljqE7UH5D8TH HKHfB+KhQYoZqXkol9SXFc0RGKLKTwptW9NuIkrijC2/pb/zzj8nZyTu+SpmDxpBIRE4bsMk bjbkg0eSEnV+CWwW0KPuJHMztpQgiU55TXKodhzBROeB1w41BY3/yRYsJheo3M/cKmfmcLTO PE2DoUNXRtb/AHjgzTqW59/kBW/dKEAv2aByo+Gj8MfmL45Pj1AnxSX/8XCMmgJWj9ogVtGv WmkJaBy/cvWjGO09tE+gAsLWa/5StvIoJ8w6xzkr5tPeqMb04hiYBXKe8LvVhsB2Z1+FrhBY BZrJVCBUplqIxBdHobcZPGDTYO+5eOtyKq0tT9SpdaWC1CMmPyKKSYqGiHRQ4St6fRInNTs9 BwKCu7T3CwqPpKiOThF9rd2uojpfkoUF+vQzSJtq+0qmkZwng4R0Nb2yxwyia2mREKRc/uXO wU0EU1pfSQEQAOFySm9/h7zyPU8AJO3Nh3L6QkkvCE4uHfv1Nfw36Vs7I06Q3r2iIqgd+jJF EZHPW7t7j5xooK78+uhyaAPPuggFJZHhzrxhqD1JAwUcWppyRbmli1fAVTN/jr1icAL9WcHF 9+SCA4JqZvO+AtzLcs3EFaLilolFIwOYSM9VY3WMvIQXgv1pvwiwDpcIP42IjOJeJz8uWv0e AZPaDnZx1NZCFy+3MEYPTt7sCwLdVsCXyF5qVwKjyluu/Z5cLn0w5uZn8uq5yDB5sQSAzQKm 15zLKllsE9JPv7b3XC+L/KIOY2vkDz6GmByvU2C5ez0g4QHLzxQ25BS7VN8xhy8PPL3sfGR8 nTTVl7z0gm9jTexmsvS+/OEjNNdam3ec7ycYAwJ71tCnCkA2wufewEUwPvj9vT/alcoe67WO zARbOG9PZzw/zS87coo+HffjingjhWMM8fagIuxkoiUt4dKh9WUmteH/LzRqPGNVGOeI9pNT NiKGrYn3vjEDsO31kWwW1ullWor+HLwvDXzorjRr6DYFUQmRiwmwYaRzlXGpRBLoII1dzwi2 ZsWDF+6BUXxKuNhk+t45AClg0Gvy+OGiWik6ys7vzwm9D1bkr6/zg4BBsdhH7xW9KWuJF9Im uO85BFuURlnYIEwuIgPUvCLm87mSdufDwl3FbiIDaD+SvbwvABEBAAHCwV8EGAEIAAkFAlNa X0kCGwwACgkQdl/ibGtGdYRHPg/9HZpFJ7A02gz1iKCA200kzHYAVxLgddGs7wPbqSQOVi26 jNxCzR/FGckZ9Bnlg9mHGWrtxR3AdE0hYpGgKmltE1bwb8tx1o9kkbDcy1aPE0vx0A2Md0Cy mhEAJ3CeJHUoVfmhyqOTT6Y0+nJ5H0LuHxw7PAgGR62goTk9wI4Nv8E7zTZ8UMLUFidxl5Ah GcxaKUQKnwtvy0vFcCar0vdHhzsLMgPAxZZ84yYypmeGdUQCIf0Tg73iTAdngdYLgBhCLOqB 5G5hBRZbChIEDMbPNqAeDnvKzqsmLA228gLeP6u26pj0iLx6G2WIeVcyiQ4Bc+B4m6zQQeDu YwU3sZua+t1Mx0aF0d1336pvOG4IkEyKOzNPnGjEuWorFgf3fOzHRIcpmnrxnJklDCeLrdmo 3k//ijHT3wzTR5WmTLU8un2XkQGmxAf1CUar5ks4HnPFMUVO68L08L8zc6kVRd0uvvJzzcXJ eHlhsZU0jFHj1C/nxPVmYpz0ffgffVnopEk8aYLPJDEdhJs/0oNPhLn8PH/6JowNvUb1925I Gs/EghPkYSTcEqQf9KgAQWzvHGSWOWiCBd8m7Zr+oFMM83O2Jxyy9fPlc2ddGJkituk2QnyE TQe6raB3McL7SFYzKgE0h31zajfzLkS2+SHtdY7bJytbVSXNTMzgpXdIMsiF85Q= Message-ID: Date: Wed, 10 Jun 2020 11:03:55 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: <20200610005402.152495-4-ebiggers@kernel.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-crypto-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org Hi Eric, > + Note that RFC 8221 considers AH itself to be "NOT RECOMMENDED". It is > + better to use ESP only, using an AEAD cipher such as AES-GCM. What's NOT RECOMMENDED according to the RFC is the combination of ESP+AH (i.e. use ESP only for confidentiality and AH for authentication), not AH by itself (although the RFC keeps ENCR_NULL as a MUST because ESP with NULL encryption is generally preferred over AH due to NATs). Regards, Tobias