220 12518 <53FB9F25.8010207@gmx.net> article Path: news.gmane.org!not-for-mail From: Jens Maurer Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Cryptographic hash functions reloaded [was Interest in cryptographic functions within the standard library] Date: Mon, 25 Aug 2014 22:40:05 +0200 Lines: 32 Approved: news@gmane.org Message-ID: <53FB9F25.8010207@gmx.net> References: <53F8F620.3090701@gmx.de> <53F989E9.5090701@gmx.net> <56088911-e6b9-4b1c-91cc-3aed83d87bd7@isocpp.org> <53FA5945.4070800@gmx.net> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-Trace: ger.gmane.org 1408999220 3878 80.91.229.3 (25 Aug 2014 20:40:20 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Mon, 25 Aug 2014 20:40:20 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDPMTYGK64JRBJ5652PQKGQE6IK6QCY@isocpp.org Mon Aug 25 22:40:13 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-we0-f198.google.com ([74.125.82.198]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1XM13h-0003Ij-48 for gclcip-std-proposals@m.gmane.org; Mon, 25 Aug 2014 22:40:09 +0200 Original-Received: by mail-we0-f198.google.com with SMTP id x48sf8451883wes.5 for ; Mon, 25 Aug 2014 13:40:08 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:message-id:date:from:user-agent:mime-version:to :subject:references:in-reply-to:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:list-post:list-help:list-archive:list-subscribe :list-unsubscribe:content-type; bh=5UUJ5NBi2g59xLFSfR243Gt0xPatxTgsFe5h2dU/Fbw=; b=WJWiPHzboInkgHkL9HfH6EII/qMpSDET1ei5ZcQC/PKbTiXl8s9sl1xJMhLNa4X3Ep 8oEy2g0VA7pcxO4AezaixvMl9PEfU8ByanH/JTyVOd1i6kdgVd4gYMNL5PznEl6JMNXP DtlKEJ3wIA83nQFyvH05X4fCxNgNkq+D0m19vlT5icD6tdE2mLwW7sJgMOB+BO695tjs Su0iKb71Mp1RQkifhyFy0mN1Dpz/IRkj31vu/Qqo6cvIzA5LiuPVdTZPiQrM6BWPukdO tiF3AIv6Tpm31Xg6o/HDqhdE/1BgmEwoiACXJoIdnRTJbabGxuuSaYnR4jz4Bia266+P K6Uw== X-Gm-Message-State: ALoCoQn6C6xTBtNuf1UXZIpzUwL0YL7oqPnV7Us5ZPOq+EEKa92NdbiTYDppj+JPUZfbALVrlXqs X-Received: by 10.112.168.230 with SMTP id zz6mr450359lbb.10.1408999208754; Mon, 25 Aug 2014 13:40:08 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.152.10.38 with SMTP id f6ls390820lab.78.gmail; Mon, 25 Aug 2014 13:40:07 -0700 (PDT) X-Received: by 10.152.163.199 with SMTP id yk7mr5225446lab.85.1408999207545; Mon, 25 Aug 2014 13:40:07 -0700 (PDT) Original-Received: from mout.gmx.net (mout.gmx.net. [212.227.17.21]) by mx.google.com with ESMTPS id m9si996839lbk.83.2014.08.25.13.40.07 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 25 Aug 2014 13:40:07 -0700 (PDT) Received-SPF: pass (google.com: domain of Jens.Maurer@gmx.net designates 212.227.17.21 as permitted sender) client-ip=212.227.17.21; Original-Received: from [192.168.2.100] ([178.7.39.200]) by mail.gmx.com (mrgmx102) with ESMTPSA (Nemesis) id 0MaV3V-1X20AZ3MKn-00KAVl for ; Mon, 25 Aug 2014 22:40:06 +0200 User-Agent: Mozilla/5.0 (X11; Linux i686; rv:6.0.1) Gecko/20110830 Thunderbird/6.0.1 In-Reply-To: X-Provags-ID: V03:K0:58KUADWoVoy+pLMEn8p8Wkem69MeEHXz141lrqTrETgKa5QEg8F 6jbIHTQ4NacWN1qo3S5bM58itJMk6/WarOB5ZDIBN4U8IeB5oBdRKYhpTTRjpa+rbm+4J5k t5Yd2l09IfyKzT9LMTXr83B/956yjJkiGbXhgGMOCQBXtznlgNoP796/gyOHxB+aHyX/rze vb48zNFBrVqnFMDLkrPLA== X-UI-Out-Filterresults: notjunk:1; X-Original-Sender: Jens.Maurer@gmx.net X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of Jens.Maurer@gmx.net designates 212.227.17.21 as permitted sender) smtp.mail=Jens.Maurer@gmx.net Precedence: list Mailing-list: list std-proposals@isocpp.org; contact std-proposals+owners@isocpp.org List-ID: X-Google-Group-Id: 399137483710 List-Post: , List-Help: , List-Archive: List-Subscribe: , List-Unsubscribe: , Xref: news.gmane.org gmane.comp.lang.c++.isocpp.proposals:12518 Archived-At: On 08/25/2014 05:21 PM, Olaf van der Spek wrote: > On Sun, Aug 24, 2014 at 11:29 PM, Jens Maurer wrote: >> Also, simply hashing >> int x[] = { 0, 1, 2, 3 }; >> my_hash(x, sizeof(x)); >> >> doesn't give you a consistent hash value across different machines, >> because the hash operates on bytes, but the endianess of the "int" >> (i.e. the mapping to bytes) differs. >> >>> Perhaps we should have (array_view<>) instead? >> >> Well, array_view is probably equivalent to the >> "unsigned char" proposal. > > Kinda. Shouldn't both array_view<> and string_view<> be supported? The mapping of application-level data (structs, strings etc.) should be left to an adaptation layer, independent of the actual hash algorithm. Howard's proposal has this part right. Jens -- --- You received this message because you are subscribed to the Google Groups "ISO C++ Standard - Future Proposals" group. To unsubscribe from this group and stop receiving emails from it, send an email to std-proposals+unsubscribe@isocpp.org. To post to this group, send email to std-proposals@isocpp.org. Visit this group at http://groups.google.com/a/isocpp.org/group/std-proposals/. .