From nobody Wed Nov 14 13:44:35 2018 Return-Path: X-Original-To: dcrup@ietfa.amsl.com Delivered-To: dcrup@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 41CC6128B14 for ; Wed, 14 Nov 2018 13:44:34 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.999 X-Spam-Level: X-Spam-Status: No, score=-1.999 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (4096-bit key) header.d=aegee.org Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id qyEMDjw-91QA for ; Wed, 14 Nov 2018 13:44:31 -0800 (PST) Received: from mail.aegee.org (mail.aegee.org [144.76.142.78]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1D7CB126CB6 for ; Wed, 14 Nov 2018 13:44:30 -0800 (PST) Authentication-Results: mail.aegee.org/wAELiNiO006500; auth=pass (LOGIN) smtp.auth=didopalauzov@AEGEE.ORG DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=aegee.org; s=k4096; t=1542231866; i=dkim+MSA-tls@aegee.org; r=y; bh=/LxaoD1lb/fUPXoEkBuSOegW5h9TifMbnDEFz5CuhsQ=; h=Subject:From:To:Cc:Date; b=DxPDTNVFJC2GO0eMOwwX5OAX+WBg0diAr4H9+fzAhQn8qsMglygE0YdNiHlKTTHCr FWQlDYWu2BdcFF1gRLgg2Meoe+ffWM7xJA0/D0Wp8UbC/cdJRMA1Ki8bwUcYcE67IF fpWLLQq6FDvHbMeSXNHKfZaXSsVXPfqw9V20SOmjcqUGGTd9o1/qqVaC2QvgbJ3yxa YgF4s7IdDFHHf9lOO21onjQKKEUE0HRKYGpGAiQgYPbp1p+gEU97n+epIf+pndJXuE ROTGWN++cDtGSv4yb5v7ndKaXn1CGILosGG4cknOHlKOMbniZkY5l0IzEqtCa/3CJs a++6McOKljkxat3loJcbtwp6PjJmVqV9zckQEaoaje57EZeSLUZ8F8iyHX6EruoZBX 9ws/hl5Plgi7zFVk/Z9r5lJnZXHFKMSxdjY9VWC2KR6ODdN3Fkm8u4xxKaCXQfexJH 03E+rpTZbR7fFT9hwLpmPDe4zKjwwD0GvpKSzRZM/ANyopYLe4i8/axcQhpWgWl22p NDB98WWr/XLgCWh0kBrlw13akU1jIUoTDLMCGg1Tx7+D+19sg+Wy0Kk7VqVPutoCSa sacQJhl/qtpEgApUU/9CbrTJ5+i7z1YOVwxL0l7uCJls+XaTPZb+6HzmB27xzuJFyT qIwN4U5V4T4zyhOYde2c9xdw= Authentication-Results: mail.aegee.org/wAELiNiO006500; dkim=none Received: from Tylan (dslb-084-061-083-131.084.061.pools.vodafone-ip.de [84.61.83.131]) (authenticated bits=0) by mail.aegee.org (8.15.2/8.15.2) with ESMTPSA id wAELiNiO006500 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Wed, 14 Nov 2018 21:44:26 GMT Message-ID: <1b32eeb225568185b52691d684ea59e0b2f9f26d.camel@aegee.org> From: =?UTF-8?Q?=D0=94=D0=B8=D0=BB=D1=8F=D0=BD_?= =?UTF-8?Q?=D0=9F=D0=B0=D0=BB=D0=B0=D1=83=D0=B7=D0=BE=D0=B2?= To: dcrup@ietf.org Cc: Nikos Mavrogiannopoulos Date: Wed, 14 Nov 2018 21:44:22 +0000 Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.31.2 Mime-Version: 1.0 Content-Transfer-Encoding: 8bit X-Virus-Scanned: clamav-milter 0.100.2 at mail.aegee.org X-Virus-Status: Clean Archived-At: Subject: [Dcrup] DKIM-Signing hashes with Ed25519 X-BeenThere: dcrup@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DKIM Crypto Update List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Nov 2018 21:44:34 -0000 Hello, the algoritm described in RFC 6376 “DomainKeys Identified Mail (DKIM) Signatures” for signing a message is: 1. Normalize/Canonicalize (Section 5.3) 2. Compute hash (Section 5.5): “The Signer MUST compute the message hash as described in Section 3.7 and then sign it using the selected public-key algorithm.” 3. Sign the hash (Section 5.6): “The DKIM-Signature header field MUST be the same as used to compute the hash as described above, except that the value of the "b=" tag MUST be the appropriately signed hash computed in the previous step…” This RFC describes the rsa-sha256 algorithm for signing (for the aforementioned hash). RFC 8463 “A New Cryptographic Signature Method for DomainKeys Identified Mail (DKIM)” adds the Ed25519-SHA256 signing algorithm (Section 3): “The Ed25519-SHA256 signing algorithm computes a message hash as defined in Section 3 of [RFC6376] using SHA-256 [FIPS-180-4- 2015] as the hash-alg. It signs the hash with the PureEdDSA variant Ed25519, as defined in RFC 8032, Section 5.1 [RFC8032].” At https://www.ietf.org/mail-archive/web/dcrup/current/msg00501.html is stated, that GnuTLS does ED25519 signing of data, but not of hashed — ED25519 is not meant for the latter. The answer at https://www.ietf.org/mail-archive/web/dcrup/current/msg00502.html says, that “if the spec says there’s a pure version that doesn’t hash its input, the library would implement it.” I asked at https://gitlab.com/gnutls/gnutls/issues/613 to enhance GnuTLs to sign per RFC 8463. The answer is, that there is a pure EdDSA, which can sign data. A pre-hashed-EdDSA version, which can sign hashes, is not standardized. Please join https://gitlab.com/gnutls/gnutls/issues/613 to explain what signing ED25519 hashes mean and how and shall it be implemented. Regards Дилян From nobody Wed Nov 14 15:28:53 2018 Return-Path: X-Original-To: dcrup@ietfa.amsl.com Delivered-To: dcrup@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2F3CD130DFC for ; Wed, 14 Nov 2018 15:28:52 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.999 X-Spam-Level: X-Spam-Status: No, score=-1.999 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=wizmail.org Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id s-Fdlu842Iwv for ; Wed, 14 Nov 2018 15:28:50 -0800 (PST) Received: from wizmail.org (wizmail.org [IPv6:2a00:1940:107::2:0:0]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id CE2B5130DFD for ; 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bh=aovcH0WF5QDAhacu5VT8kQt7REN2CExhIPB3knWYzqY=; b=n knxRghTGoeIEKBee2lQIyU5WWwHb4FiffkCremg8N8vnp3wCeC+2HV6J33NXJp5ok2oKrg0ScVYte e+xAB/pn7HB2//smdS4cmc8aCkAgkzFTIhSAgFsIg5zokqCKdCoPPfHOVlHVE4Eg/mHmDJUbIcAgD ry4sV+KTKypuyYvc=; Authentication-Results: wizmail.org; iprev=pass (vgate18.wizint.net) smtp.remote-ip=2a00:1940:107::1:2f:0; auth=pass (PLAIN) smtp.auth=jgh@wizmail.org Received: from vgate18.wizint.net ([2a00:1940:107::1:2f:0] helo=lap.dom.ain) by wizmail.org with esmtpsa (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.91.116) id 1gN4aV-0007m5-TY for dcrup@ietf.org (return-path ); Wed, 14 Nov 2018 23:28:48 +0000 To: dcrup@ietf.org References: <1b32eeb225568185b52691d684ea59e0b2f9f26d.camel@aegee.org> From: Jeremy Harris Openpgp: preference=signencrypt Autocrypt: addr=jgh@wizmail.org; prefer-encrypt=mutual; keydata= xsBNBFWABsQBCADTFfb9EHGGiDel/iFzU0ag1RuoHfL/09z1y7iQlLynOAQTRRNwCWezmqpD p6zDFOf1Ldp0EdEQtUXva5g2lm3o56o+mnXrEQr11uZIcsfGIck7yV/y/17I7ApgXMPg/mcj ifOTM9C7+Ptghf3jUhj4ErYMFQLelBGEZZifnnAoHLOEAH70DENCI08PfYRRG6lZDB09nPW7 vVG8RbRUWjQyxQUWwXuq4gQohSFDqF4NE8zDHE/DgPJ/yFy+wFr2ab90DsE7vOYb42y95keK tTBp98/Y7/2xbzi8EYrXC+291dwZELMHnYLF5sO/fDcrDdwrde2cbZ+wtpJwtSYPNvVxABEB AAHNJkplcmVteSBIYXJyaXMgKG5vbmUpIDxqZ2hAd2l6bWFpbC5vcmc+wsB7BBMBAgAlAhsD BgsJCAcDAgYVCAIJCgsEFgIDAQIeAQIXgAUCVYAYBAIZAQAKCRC85YyM5B8y34iFB/9wozIY RogNdY1aejFFixb6++y4b1riyjMvWEULeEzDlQ0lMT6Z3PxXhZILD4y4aP7Kzx0ozXa5qaKy 41EAPKQoPipnRAH04QytJbIERvz8Tot/LeCVKUc0G9DVxOPBD03czTgqgz4EjV2qvnLF+rTU 0YBevrNCluKosGSd+3RvLWVu0hBhn9pELKfXJNSQXZb+TpHDhSDZ/gCrglBEOhA6YWbDb/4g z+5TFKdk+B++iAQZSHv7zISabjN+BPYgI47A+MU4JycoXaAUnMc0l5ba6fGNaIrzruE4aAZr lP5o+7mlU9Mm0QJqdqYxYPAiplJGrZv+YXH1fp5ueEK3l+NGzsBNBFWABsQBCADphLHaKToR uR/E7THerBiCjDatwCaETOKOTY2zRBQpaQ32p/F2XIGLS8Cc27+grZSKQ6ZX0ZN47O+AFyFH F8DH90IXZFpJR3Rb8zgXT8jnLX08DM31eECZHnRzFhGlOmq6WAUlqB3GKCPUCY2c4eTRXyoX LteTxrXCYoj45y/YmvlZrlonBNjPBAyHiO/LNz+V7fZtNsN7N/XGrnLbcdNfNd+SD1ENmbLJ 8RvyymxguTyB/ka9JdjHHIoQEJ6L166B3hhfCHpt8iC0GPZkti9IMl0NoJ029jJm3Jq1qEce EBn5H5QMGn6Fq64iXwTsO1TMNUwpWx8pjvV7wVIxjI8ZABEBAAHCwF8EGAECAAkFAlWABsQC GwwACgkQvOWMjOQfMt9N6Af8CS2CTrMQFdhkGEtBXmL4ifD8UHFkBRBGmM8ZL2fWUBTZXT8m rdRMOK6tcPnKWaCvWvKr0knt970j/DyAgFmH8hgOi3yctigFecVDjjilAeCJMq38s1tYKYiL DbBdHWtdkA9uHZwq3lfd3QxcEEO3QamQF+dO7h8gAOXlG+po87Hm+E0wz4swIB8+S37Jzrx9 uu0LSFDfJCTK+TIKGa5Un8LxPxyq9WnnNDh72zK7BiRidk/s40KcNod83NM4Hn/sbGfyLa8s S0F3ME0S+ocSMOiu/ZHHOiwpLYNbwTJ7stZxGsrguWeT9P+amxbA/YlK95LedstwvN+WcHZ7 d++Arg== Message-ID: Date: Wed, 14 Nov 2018 23:28:43 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.0 MIME-Version: 1.0 In-Reply-To: <1b32eeb225568185b52691d684ea59e0b2f9f26d.camel@aegee.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-Pcms-Received-Sender: vgate18.wizint.net ([2a00:1940:107::1:2f:0] helo=lap.dom.ain) with esmtpsa Archived-At: Subject: Re: [Dcrup] DKIM-Signing hashes with Ed25519 X-BeenThere: dcrup@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DKIM Crypto Update List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Nov 2018 23:28:52 -0000 On 14/11/2018 21:44, Дилян Палаузов wrote: > I asked at https://gitlab.com/gnutls/gnutls/issues/613 to enhance > GnuTLs to sign per RFC 8463. The answer is, that there is a pure > EdDSA, which can sign data. A pre-hashed-EdDSA version, which can sign > hashes, is not standardized. It certainly confused me when I was implementing it for Exim. Despite being called "pure" it does a hash on the data, and signs the hash. You can't sign raw data, and you can't sign a separately computed hash. What DKIM requires is that you precompute a sha256 hash (just like you would for RSA-signing) and then feed it to this (oddly-named) "pure" routine for signing. So you get the signature of a SHA512-hash of a SHA256-hash of the headers. Yup, hashed twice. No, I don't know why. But you _can_ do it with the provided interfaces in both GnuTLS and OpenSSL. -- Cheers, Jeremy From nobody Wed Nov 14 15:39:31 2018 Return-Path: X-Original-To: dcrup@ietfa.amsl.com Delivered-To: dcrup@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DDD60130E73 for ; Wed, 14 Nov 2018 15:39:29 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.2 X-Spam-Level: X-Spam-Status: No, score=-4.2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id robBFDTD8UYn for ; Wed, 14 Nov 2018 15:39:27 -0800 (PST) Received: from straasha.imrryr.org (straasha.imrryr.org [100.2.39.101]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 3794D130E4B for ; Wed, 14 Nov 2018 15:39:27 -0800 (PST) Received: from [192.168.1.161] (unknown [192.168.1.161]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by straasha.imrryr.org (Postfix) with ESMTPSA id 69756324173 for ; Wed, 14 Nov 2018 18:39:25 -0500 (EST) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 12.1 \(3445.101.1\)) From: Viktor Dukhovni In-Reply-To: <1b32eeb225568185b52691d684ea59e0b2f9f26d.camel@aegee.org> Date: Wed, 14 Nov 2018 18:39:24 -0500 Content-Transfer-Encoding: quoted-printable Reply-To: dcrup@ietf.org Message-Id: References: <1b32eeb225568185b52691d684ea59e0b2f9f26d.camel@aegee.org> To: dcrup@ietf.org X-Mailer: Apple Mail (2.3445.101.1) Archived-At: Subject: Re: [Dcrup] DKIM-Signing hashes with Ed25519 X-BeenThere: dcrup@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DKIM Crypto Update List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Nov 2018 23:39:30 -0000 > On Nov 14, 2018, at 4:44 PM, =D0=94=D0=B8=D0=BB=D1=8F=D0=BD = =D0=9F=D0=B0=D0=BB=D0=B0=D1=83=D0=B7=D0=BE=D0=B2 = wrote: >=20 > At https://www.ietf.org/mail-archive/web/dcrup/current/msg00501.html = is > stated, that GnuTLS does ED25519 signing of data, but not of hashed = =E2=80=94 > ED25519 is not meant for the latter. The answer at=20 > https://www.ietf.org/mail-archive/web/dcrup/current/msg00502.html = says, > that =E2=80=9Cif the spec says there=E2=80=99s a pure version that = doesn=E2=80=99t hash its > input, the library would implement it.=E2=80=9D Suppose a + b =3D c, then we also say: a =3D c - b. This just boils down hair-splitting as to what is the message, and what is the signature function. Traditionally, you take a message M and sign it with a signature = function that employs a signing algorithm S combined with a hash function H: let f =3D Sign(S, H, keys) signature =3D f(metadata || M) Now with Ed25519 the signature primitive signs data directly, it is not parametrized by a hash algorithm. So the RFC boils down to: let f =3D Ed25519(keys) signature =3D f(metadata || H(M)) i.e. instead of signing the "message" M, you sign the message H(M). That's it. All that changes is whether the hash H is part of the signature function, or is used separately to prepare the message. In general uses of Ed25519, whether to pre-hash the message or not is an implementation choice. The pure construction with no pre-hash has better collision-resistance than you get with pre-hashing, but it requires the whole message to be in memory at the same time, so is only well-suited to sufficiently short messages: https://tools.ietf.org/html/rfc8032#section-4 --=20 Viktor. From nobody Wed Nov 14 20:37:12 2018 Return-Path: X-Original-To: dcrup@ietfa.amsl.com Delivered-To: dcrup@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7CB66128A5C for ; Wed, 14 Nov 2018 20:37:11 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.752 X-Spam-Level: X-Spam-Status: No, score=-1.752 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_PASS=-0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1536-bit key) header.d=iecc.com header.b=U+9GUae5; dkim=pass (1536-bit key) header.d=taugh.com header.b=jzbcQIt4 Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id jXg1kwC_QyEn for ; Wed, 14 Nov 2018 20:37:10 -0800 (PST) Received: from gal.iecc.com (gal.iecc.com [IPv6:2001:470:1f07:1126:0:43:6f73:7461]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 43FE31286E3 for ; Wed, 14 Nov 2018 20:37:10 -0800 (PST) Received: (qmail 61866 invoked from network); 15 Nov 2018 04:37:07 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=simple; d=iecc.com; h=date:message-id:from:to:cc:subject:in-reply-to:mime-version:content-type:content-transfer-encoding; s=f1a7.5becf7f3.k1811; bh=Ggqp7IyYF/OAQosnMzAbptuEQFDnIkQBFwIfN6QjNP8=; b=U+9GUae5dgp6Kijp/LUjbtMLS+vw90xtc922xJc4swpQEhzQEcXHXtHkQa6pgdWB+V2Qe+jvnvJ8J5ERZqjW1VKjIZpG8Imf7YvpYvA6WORjI5DlAtlCe6L6qUISqaJtBTftMgQcyAdkoO8BDuaaxAmXtFRmraR1OPunIpeDhoYK9YIDMnBm7EiqXN39QDAgAjibz/Uui3rJz3K34s05belOp4x8kRnP4xutdxy16dNQPgsWLvhpTS9pfnupU6HL DKIM-Signature: v=1; a=rsa-sha256; c=simple; d=taugh.com; h=date:message-id:from:to:cc:subject:in-reply-to:mime-version:content-type:content-transfer-encoding; s=f1a7.5becf7f3.k1811; bh=Ggqp7IyYF/OAQosnMzAbptuEQFDnIkQBFwIfN6QjNP8=; b=jzbcQIt4rM2M4+JPIAspl2HTwC40/1bq6mjtifoDHgiiRQHnaWXLd8f7zsqX/PGSVBteYNPurL8V6UiHzBXV4LGx3CfUi+6Ae+iel2efTLPulGaieOoqlc0T4zix2q6dHhCAKe7HZ7QWscptfH6LLxeOFcSArboZhgkGg+GmzIGhuGquGYeyb40Oyh1Qsdnv7V7QQXTiXLSycxTBynev0PuqwoxjkH3lOLzyrC908JN89qaai3ra0rEUKL2gEjAz Received: from ary.qy ([IPv6:2001:470:1f07:1126::78:696d:6170]) by imap.iecc.com ([IPv6:2001:470:1f07:1126::78:696d:6170]) with ESMTP via TCP6; 15 Nov 2018 04:37:07 -0000 Received: by ary.qy (Postfix, from userid 501) id 3FA5920088D849; Wed, 14 Nov 2018 23:37:06 -0500 (EST) Date: 14 Nov 2018 23:37:06 -0500 Message-Id: <20181115043707.3FA5920088D849@ary.qy> From: "John Levine" To: dcrup@ietf.org Cc: jgh@wizmail.org In-Reply-To: Organization: Taughannock Networks X-Headerized: yes Mime-Version: 1.0 Content-type: text/plain; charset=utf-8 Content-transfer-encoding: 8bit Archived-At: Subject: Re: [Dcrup] DKIM-Signing hashes with Ed25519 X-BeenThere: dcrup@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DKIM Crypto Update List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 15 Nov 2018 04:37:11 -0000 In article you write: >So you get the signature of a SHA512-hash of a SHA256-hash of the >headers. Yup, hashed twice. No, I don't know why. We asked around and the advice we got was that the pure version of ed25519 was likely to be much more widely implemented than HashEdDSA. We found the single and double hash thing pretty confusing too, but as I read RFC8032, PureEdDSA does *not* do the second sha-512 hash while HashEdDSA does. By the way, have you checked that your code validates the ed25519 example signature in RFC 8463? I don't think hashing twice will get the right result. You might also see whether it interoperates with Scott Kittermans python DKIM module. R's, John From nobody Thu Nov 15 02:00:42 2018 Return-Path: X-Original-To: dcrup@ietfa.amsl.com Delivered-To: dcrup@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B707512D4ED for ; Thu, 15 Nov 2018 02:00:40 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2 X-Spam-Level: X-Spam-Status: No, score=-2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=wizmail.org Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id zFIKpERqufno for ; Thu, 15 Nov 2018 02:00:35 -0800 (PST) Received: from wizmail.org (wizmail.org [IPv6:2a00:1940:107::2:0:0]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 4983E1252B7 for ; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.0 MIME-Version: 1.0 In-Reply-To: <20181115043707.3FA5920088D849@ary.qy> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-Pcms-Received-Sender: [46.33.133.68] (helo=lap.dom.ain) with esmtpsa Archived-At: Subject: Re: [Dcrup] DKIM-Signing hashes with Ed25519 X-BeenThere: dcrup@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DKIM Crypto Update List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 15 Nov 2018 10:00:41 -0000 On 15/11/2018 04:37, John Levine wrote: > You might also see whether it interoperates with Scott > Kittermans python DKIM module. Scott and I verified interworking, back in February: https://www.ietf.org/mail-archive/web/dcrup/current/msg00668.html -- Cheers, Jeremy From nobody Thu Nov 15 05:18:54 2018 Return-Path: X-Original-To: dcrup@ietfa.amsl.com Delivered-To: dcrup@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4F0A7130DF5 for ; Thu, 15 Nov 2018 05:18:46 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.172 X-Spam-Level: X-Spam-Status: No, score=-1.172 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.47, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, KHOP_DYNAMIC=1.999, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=akamai.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id kj5EUyUvIID9 for ; Thu, 15 Nov 2018 05:18:45 -0800 (PST) Received: from mx0b-00190b01.pphosted.com (mx0b-00190b01.pphosted.com [IPv6:2620:100:9005:57f::1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 404FE130E51 for ; 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Thu, 15 Nov 2018 13:18:42 +0000 Received: from pps.filterd (prod-mail-ppoint2.akamai.com [127.0.0.1]) by prod-mail-ppoint2.akamai.com (8.16.0.21/8.16.0.21) with SMTP id wAFD5YPZ005881; Thu, 15 Nov 2018 08:18:42 -0500 Received: from email.msg.corp.akamai.com ([172.27.25.33]) by prod-mail-ppoint2.akamai.com with ESMTP id 2nr7j7qxnn-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NOT); Thu, 15 Nov 2018 08:18:42 -0500 Received: from USTX2EX-DAG1MB1.msg.corp.akamai.com (172.27.27.101) by ustx2ex-dag1mb3.msg.corp.akamai.com (172.27.27.103) with Microsoft SMTP Server (TLS) id 15.0.1365.1; Thu, 15 Nov 2018 07:18:41 -0600 Received: from USTX2EX-DAG1MB1.msg.corp.akamai.com ([172.27.6.131]) by ustx2ex-dag1mb1.msg.corp.akamai.com ([172.27.6.131]) with mapi id 15.00.1365.000; Thu, 15 Nov 2018 07:18:40 -0600 From: "Salz, Rich" To: Jeremy Harris , "dcrup@ietf.org" Thread-Topic: [Dcrup] DKIM-Signing hashes with Ed25519 Thread-Index: AQHUfGNCf0EUhDDWiEqbbYECvM8ymqVQT16AgABWKgCAAFpcgP//44sA Date: Thu, 15 Nov 2018 13:18:40 +0000 Message-ID: References: <20181115043707.3FA5920088D849@ary.qy> <76921702-e715-04fe-9c3e-4793d84125a7@wizmail.org> In-Reply-To: <76921702-e715-04fe-9c3e-4793d84125a7@wizmail.org> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/10.13.0.181109 x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [172.19.32.206] Content-Type: text/plain; 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Mon, 19 Nov 2018 20:49:45 -0800 (PST) MIME-Version: 1.0 From: =?UTF-8?B?6rmA7ISx7ZWc?= Date: Tue, 20 Nov 2018 13:49:34 +0900 Message-ID: To: dcrup@ietf.org Cc: SHA1 sha1RSA HaN1-CloudComputing-N1 OSIS Driver , "Sr SUNGHAN ENTERKHAN CO LTD KIM, DigitalObjectIdentifier" Content-Type: multipart/alternative; boundary="000000000000d4398d057b115c85" Archived-At: X-Mailman-Approved-At: Wed, 21 Nov 2018 08:09:15 -0800 Subject: [Dcrup] Mail regarding draft-ietf-dcrup-dkim-crypto X-BeenThere: dcrup@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DKIM Crypto Update List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 20 Nov 2018 08:28:30 -0000 --000000000000d4398d057b115c85 Content-Type: text/plain; charset="UTF-8" sunghan.kim@enterkhan.com gloomystar81@msn.com legal-discuss@apache.org DOI SUNGHAN KIM --000000000000d4398d057b115c85 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable