draft-ietf-lamps-eai-addresses-02.txt		draft-ietf-lamps-eai-addresses-03.txt
	LAMPS A. Melnikov, Ed.		LAMPS A. Melnikov, Ed.
	Internet-Draft Isode Ltd		Internet-Draft Isode Ltd
	Intended status: Standards Track W. Chuang, Ed.		Intended status: Standards Track W. Chuang, Ed.
	Expires: May 4, 2017 Google, Inc.		Expires: June 12, 2017 Google, Inc.
	October 31, 2016		December 9, 2016
	Internationalized Email Addresses in X.509 certificates		Internationalized Email Addresses in X.509 certificates
	draft-ietf-lamps-eai-addresses-02		draft-ietf-lamps-eai-addresses-03
	Abstract		Abstract
	This document defines a new name form for inclusion in the otherName		This document defines a new name form for inclusion in the otherName
	field of an X.509 Subject Alternative Name extension that allows a		field of an X.509 Subject Alternative Name and Issuer Alternate Name
	certificate subject to be associated with an Internationalized Email		extension that allows a certificate subject to be associated with an
	Address.		Internationalized Email Address.
	Status of This Memo		Status of This Memo
	This Internet-Draft is submitted in full conformance with the		This Internet-Draft is submitted in full conformance with the
	provisions of BCP 78 and BCP 79.		provisions of BCP 78 and BCP 79.
	Internet-Drafts are working documents of the Internet Engineering		Internet-Drafts are working documents of the Internet Engineering
	Task Force (IETF). Note that other groups may also distribute		Task Force (IETF). Note that other groups may also distribute
	working documents as Internet-Drafts. The list of current Internet-		working documents as Internet-Drafts. The list of current Internet-
	Drafts is at http://datatracker.ietf.org/drafts/current/.		Drafts is at http://datatracker.ietf.org/drafts/current/.
	Internet-Drafts are draft documents valid for a maximum of six months		Internet-Drafts are draft documents valid for a maximum of six months
	and may be updated, replaced, or obsoleted by other documents at any		and may be updated, replaced, or obsoleted by other documents at any
	time. It is inappropriate to use Internet-Drafts as reference		time. It is inappropriate to use Internet-Drafts as reference
	material or to cite them other than as "work in progress."		material or to cite them other than as "work in progress."
	This Internet-Draft will expire on May 4, 2017.		This Internet-Draft will expire on June 12, 2017.
	Copyright Notice		Copyright Notice
	Copyright (c) 2016 IETF Trust and the persons identified as the		Copyright (c) 2016 IETF Trust and the persons identified as the
	document authors. All rights reserved.		document authors. All rights reserved.
	This document is subject to BCP 78 and the IETF Trust's Legal		This document is subject to BCP 78 and the IETF Trust's Legal
	Provisions Relating to IETF Documents		Provisions Relating to IETF Documents
	(http://trustee.ietf.org/license-info) in effect on the date of		(http://trustee.ietf.org/license-info) in effect on the date of
	publication of this document. Please review these documents		publication of this document. Please review these documents
	skipping to change at page 2, line 13 ¶		skipping to change at page 2, line 13 ¶
	described in the Simplified BSD License.		described in the Simplified BSD License.
	Table of Contents		Table of Contents
	1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2		1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
	2. Conventions Used in This Document . . . . . . . . . . . . . . 2		2. Conventions Used in This Document . . . . . . . . . . . . . . 2
	3. Name Definitions . . . . . . . . . . . . . . . . . . . . . . 2		3. Name Definitions . . . . . . . . . . . . . . . . . . . . . . 2
	4. Matching of Internationalized Email Addresses in X.509		4. Matching of Internationalized Email Addresses in X.509
	certificates . . . . . . . . . . . . . . . . . . . . . . . . 3		certificates . . . . . . . . . . . . . . . . . . . . . . . . 3
	5. Name constraints in path validation . . . . . . . . . . . . . 4		5. Name constraints in path validation . . . . . . . . . . . . . 4
	6. Resource Considerations . . . . . . . . . . . . . . . . . . . 6		6. Deployment Considerations . . . . . . . . . . . . . . . . . . 6
	7. Security Considerations . . . . . . . . . . . . . . . . . . . 6		7. Security Considerations . . . . . . . . . . . . . . . . . . . 6
	8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7		8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6
	9. References . . . . . . . . . . . . . . . . . . . . . . . . . 7		9. References . . . . . . . . . . . . . . . . . . . . . . . . . 6
	9.1. Normative References . . . . . . . . . . . . . . . . . . 7		9.1. Normative References . . . . . . . . . . . . . . . . . . 6
	9.2. Informative References . . . . . . . . . . . . . . . . . 8		9.2. Informative References . . . . . . . . . . . . . . . . . 7
	Appendix A. ASN.1 Module . . . . . . . . . . . . . . . . . . . . 8		Appendix A. ASN.1 Module . . . . . . . . . . . . . . . . . . . . 8
	Appendix B. Acknowledgements . . . . . . . . . . . . . . . . . . 9		Appendix B. Example of smtpUtf8Name . . . . . . . . . . . . . . 9
			Appendix C. Acknowledgements . . . . . . . . . . . . . . . . . . 9
	Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 9		Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 9
	1. Introduction		1. Introduction
	[RFC5280] defines rfc822Name subjectAltName choice for representing		[RFC5280] defines rfc822Name subjectAltName choice for representing
	[RFC5322] email addresses. This form is restricted to a subset of		[RFC5322] email addresses. This form is restricted to a subset of
	US-ASCII characters and thus can't be used to represent		US-ASCII characters and thus can't be used to represent
	Internationalized Email addresses [RFC6531]. To fascilitate use of		Internationalized Email addresses [RFC6531]. To facilitate use of
	these Internationalized Email addresses with X.509 certificates, this		these Internationalized Email addresses with X.509 certificates, this
	document specifies a new name form in otherName so that		document specifies a new name form in otherName so that
	subjectAltName and issuerAltName can carry them.		subjectAltName and issuerAltName can carry them.
	2. Conventions Used in This Document		2. Conventions Used in This Document
	The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",		The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
	"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this		"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
	document are to be interpreted as described in [RFC2119].		document are to be interpreted as described in [RFC2119].
	The formal syntax use the Augmented Backus-Naur Form (ABNF) [RFC5234]		The formal syntax use the Augmented Backus-Naur Form (ABNF) [RFC5234]
	notation.		notation.
	3. Name Definitions		3. Name Definitions
	The GeneralName structure is defined in [RFC5280], and supports many		The GeneralName structure is defined in [RFC5280], and supports many
	different names forms including otherName for extensibility. This		different names forms including otherName for extensibility. This
	section specifies the smtputf8Name name form of otherName, so that		section specifies the smtpUtf8Name name form of otherName, so that
	Internationalized Email addresses can appear in the subjectAltName of		Internationalized Email addresses can appear in the subjectAltName of
	a certificate, the issuerAltName of a certificate, or anywhere else		a certificate, the issuerAltName of a certificate, or anywhere else
	that GeneralName is used.		that GeneralName is used.
	id-on-smtputf8Name OBJECT IDENTIFIER ::= { id-on TBD }		id-on-smtpUtf8Name OBJECT IDENTIFIER ::= { id-on 9 }
	Smtputf8Name ::= UTF8String (SIZE (1..MAX))		smtpUtf8Name ::= UTF8String (SIZE (1..MAX))
	When the subjectAltName (or issuerAltName) extension contains an		When the subjectAltName (or issuerAltName) extension contains an
	Internationalized Email address, the address MUST be stored in the		Internationalized Email address, the address MUST be stored in the
	smtputf8Name name form of otherName. The format of smtputf8Name is		smtpUtf8Name name form of otherName. The format of smtpUtf8Name is
	defined as the ABNF rule smtputf8Mailbox. smtputf8Mailbox is a		defined as the ABNF rule smtputf8Mailbox. smtputf8Mailbox is a
	modified version of the Internationalized Mailbox which is defined in		modified version of the Internationalized Mailbox which is defined in
	Section 3.3 of [RFC6531] which is itself derived from SMTP Mailbox		Section 3.3 of [RFC6531] which is itself derived from SMTP Mailbox
	from Section 4.1.2 of [RFC5321]. [RFC6531] defines the following		from Section 4.1.2 of [RFC5321]. [RFC6531] defines the following
	ABNF rules for Mailbox whose parts are modified for		ABNF rules for Mailbox whose parts are modified for
	internationalization: <Local-part>, <Dot-string>, <Quoted-string>,		internationalization: <Local-part>, <Dot-string>, <Quoted-string>,
	<QcontentSMTP>, <Domain>, and <Atom>. In particular <Local-part> was		<QcontentSMTP>, <Domain>, and <Atom>. In particular, <Local-part>
	updated to also support UTF8-non-ascii. UTF8-non-ascii is described		was updated to also support UTF8-non-ascii. UTF8-non-ascii is
	by Section 3.1 of [RFC6532]. Also sub-domain is extended to support		described by Section 3.1 of [RFC6532]. Also, sub-domain is extended
	U-label, as defined in [RFC5890]		to support U-label, as defined in [RFC5890]
	This document further refines Internationalized [RFC6531] Mailbox		This document further refines Internationalized [RFC6531] Mailbox
	ABNF rules and calls this smtputf8Mailbox. In smtputf8Mailbox, sub-		ABNF rules and calls this smtputf8Mailbox. In smtputf8Mailbox, sub-
	domain that encode non-ascii characters SHALL use U-label Unicode		domain that encode non-ascii characters SHALL use U-label Unicode
	native character labels and MUST NOT use A-label [RFC5890]. This		native character labels and MUST NOT use A-label [RFC5890]. This
	restriction prevents having to determine which label encoding A- or		restriction prevents having to determine which label encoding A- or
	U-label is present in the Domain. As per Section 2.3.2.1 of		U-label is present in the Domain. As per Section 2.3.2.1 of
	[RFC5890], U-label use UTF-8 [RFC3629] with Normalization Form C and		[RFC5890], U-label use UTF-8 [RFC3629] with Normalization Form C and
	other properties specified there. In smtputf8Mailbox, sub-domain		other properties specified there. In smtputf8Mailbox, sub-domain
	that encode solely ASCII character labels SHALL use NR-LDH		that encode solely ASCII character labels SHALL use NR-LDH
	skipping to change at page 3, line 41 ¶		skipping to change at page 3, line 41 ¶
	no comment (text surrounded in parentheses) after it, and is not		no comment (text surrounded in parentheses) after it, and is not
	surrounded by "<" and ">".		surrounded by "<" and ">".
	In the context of building name constraint as needed by [RFC5280],		In the context of building name constraint as needed by [RFC5280],
	the smtputf8Mailbox rules are modified to allow partial productions		the smtputf8Mailbox rules are modified to allow partial productions
	to allow for additional forms required by Section 5. Name		to allow for additional forms required by Section 5. Name
	constraints may specify a complete email address, host name, or		constraints may specify a complete email address, host name, or
	domain. This means that the local-part may be missing, and domain		domain. This means that the local-part may be missing, and domain
	partially specified.		partially specified.
	smtputf8Name is encoded as UTF8String. The UTF8String encoding MUST		smtpUtf8Name is encoded as UTF8String. The UTF8String encoding MUST
	NOT contain a Byte-Order-Mark (BOM) [RFC3629] to aid consistency		NOT contain a Byte-Order-Mark (BOM) [RFC3629] to aid consistency
	across implementations particularly for comparison.		across implementations particularly for comparison.
	4. Matching of Internationalized Email Addresses in X.509 certificates		4. Matching of Internationalized Email Addresses in X.509 certificates
	In equivalence comparison with smtputf8Name, there may be some setup		In equivalence comparison with smtpUtf8Name, there may be some setup
	work to enable the comparison i.e. processing of the smtputf8Name		work to enable the comparison i.e. processing of the smtpUtf8Name
	content or the email address that is being compared against. The		content or the email address that is being compared against. The
	process for setup for comparing with smtputf8Name is split into		process for setup for comparing with smtpUtf8Name is split into
	domain steps and local-part steps. The comparison form for local-		domain steps and local-part steps. The comparison form for local-
	part always is UTF-8. The comparison form for domain depends on		part always is UTF-8. The comparison form for domain depends on
	context. While some contexts such as certificate path validation in		context. While some contexts such as certificate path validation in
	[RFC5280] specify transforming to A-label, this document RECOMMENDS		[RFC5280] specify transforming domain to A-label, this document
	transforming to UTF-8 U-label even in place of those other		RECOMMENDS transforming to UTF-8 U-label instead. This reduces the
	specifications. As more implementations natively support U-label		likelihood of errors by reducing conversions as more implementations
	domain, requiring U-label reduces conversions required, which then		natively support U-label domains.
	reduces likelihood of errors caused by bugs in implementation.
	Comparison of two smtputf8Name can be straightforward. No setup work		Comparison of two smtpUtf8Name can be straightforward. No setup work
	is needed and it can be an octet for octet comparison. For other		is needed and it can be an octet for octet comparison. For other
	email address forms such as Internationalized email address or		email address forms such as Internationalized email address or
	rfc822Name, the comparison requires additional setup to convert the		rfc822Name, the comparison requires additional setup to convert the
	format for comparison. Domain setup is particularly important for		format for comparison. Domain setup is particularly important for
	forms that may contain A- or U-label such as International email		forms that may contain A- or U-label such as International email
	address, or A-label only forms such as rfc822Name. This document		address, or A-label only forms such as rfc822Name. This document
	specifies the process to transform the domain to U-label. (To		specifies the process to transform the domain to U-label. (To
	convert the domain to A-label, follow the process process specified		convert the domain to A-label, follow the process specified in
	in section 7.5 and 7.2 in [RFC5280]) The first step is to detect		section 7.5 and 7.2 in [RFC5280]) The first step is to detect A-label
	A-label by using section 5.1 of [RFC5891]. Next if necessary,		by using section 5.1 of [RFC5891]. Next if necessary, transform the
	transform the A-label to U-label Unicode as specified in section 5.2		A-label to U-label Unicode as specified in section 5.2 of [RFC5891].
	of [RFC5891]. Finally if necessary convert the Unicode to UTF-8 as		Finally if necessary convert the Unicode to UTF-8 as specified in
	specified in section 3 of [RFC3629]. In setup for smtputf8Mailbox,		section 3 of [RFC3629]. In setup for smtputf8Mailbox, the email
	the email address local-part MUST be converted to UTF-8 if it is not		address local-part MUST be converted to UTF-8 if it is not already.
	already. The <Local-part> part of an Internationalized email address		The <Local-part> part of an Internationalized email address is
	is already in UTF-8. For the rfc822Name local-part is IA5String		already in UTF-8. For the rfc822Name local-part is IA5String
	(ASCII), and conversion to UTF-8 is trivial since ASCII octets maps		(ASCII), and conversion to UTF-8 is trivial since ASCII octets maps
	to UTF-8 without change. Once the setup is completed, comparison is		to UTF-8 without change. Once the setup is completed, comparison is
	an octet for octet comparison.		an octet for octet comparison.
	This specification expressly does not define any wildcards characters		This specification expressly does not define any wildcards characters
	and smtputf8Name comparison implementations MUST NOT interpret any		and smtpUtf8Name comparison implementations MUST NOT interpret any
	character as wildcards. Instead, to specify multiple specifying		character as wildcards. Instead, to specify multiple specifying
	multiple email addresses through smtputf8Name, the certificate should		multiple email addresses through smtpUtf8Name, the certificate should
	use multiple subjectAltNames or issuerAltNames to explicitly carry		use multiple subjectAltNames or issuerAltNames to explicitly carry
	those email addresses.		those email addresses.
	5. Name constraints in path validation		5. Name constraints in path validation
	This section defines use of smtputf8Name name for name constraints.		This section defines use of smtpUtf8Name name for name constraints.
	The format for smtputf8Name in name constraints is identical to the		The format for smtpUtf8Name in name constraints is identical to the
	use in subjectAltName as specified in Section 3 with the extension as		use in subjectAltName as specified in Section 3 with the extension as
	noted there for partial productions.		noted there for partial productions.
	Constraint comparison on complete email address with smtputf8Name		Constraint comparison on complete email address with smtpUtf8Name
	name uses the matching procedure defined by Section 4. As with		name uses the matching procedure defined by Section 4. As with
	rfc822Name name constraints as specified in Section 4.2.1.10 of		rfc822Name name constraints as specified in Section 4.2.1.10 of
	[RFC5280], smtputf8Name name can specify a particular mailbox, all		[RFC5280], smtpUtf8Name name can specify a particular mailbox, all
	addresses at a host, or all mailboxes in a domain by specifying the		addresses at a host, or all mailboxes in a domain by specifying the
	complete email address, a host name, or a domain.		complete email address, a host name, or a domain.
	Name constraint comparisons in the context [RFC5280] is specified		Name constraint comparisons in the context [RFC5280] is specified
	with smtputf8Name name are only done on the subjectAltName (and		with smtpUtf8Name name are only done on the subjectAltName (and
	issuerAltName) smtputf8Name name, and says nothing more about		issuerAltName) smtpUtf8Name name, and says nothing more about
	constaints on other email address forms such as rfc822Name.		constraints on other email address forms such as rfc822Name.
	Consequently it may be necessary to include other name constraints		Consequently it may be necessary to include other name constraints
	such as rfc822Name in addition to smtputf8Name to constrain all		such as rfc822Name in addition to smtpUtf8Name to constrain all
	potential email addresses. For example a domain with both ascii and		potential email addresses. For example a domain with both ascii and
	non-ascii local-part email addresses may require both rfc822Name and		non-ascii local-part email addresses may require both rfc822Name and
	smtputf8Name name constraints. This can be illustrated in the		smtpUtf8Name name constraints. This can be illustrated in the
	following non-normative diagram Figure 1 which shows a name		following non-normative diagram Figure 1 which shows a name
	constraint set in the intermediate CA certificate, which then applies		constraint set in the intermediate CA certificate, which then applies
	to the children entity certificates. Note that a constraint on		to the children entity certificates. Note that a constraint on
	rfc822Name does not apply to smtputf8Name and vice versa.		rfc822Name does not apply to smtpUtf8Name and vice versa.
	+------------------------------------------------------+		+--------------------------------------------------------------+
	| Root CA Cert |		| Root CA Cert |
	+------------------------------------------------------+		+--------------------------------------------------------------+
	|		|
	v		v
	+------------------------------------------------------+		+--------------------------------------------------------------+
	| Intermediate CA Cert |		| Intermediate CA Cert |
	| Name Constraint Extension |		| Name Constraint Extension |
	| Permitted |		| Permitted |
	| rfc822Name: allowed.example.com |		| rfc822Name: allowed.example.com |
	| smtputf8Name: allowed.example.com |		| smtpUtf8Name: allowed.example.com |
	| Excluded |		| Excluded |
	| rfc822Name: ignored.example.com |		| rfc822Name: ignored.allowed.example.com |
	+------------------------------------------------------+		+--------------------------------------------------------------+
	| |		| |
	v |		v |
	+------------------------------------------------------+		+--------------------------------------------------------------+
	| Entity Cert (w/explicitly permitted subjects) |		| Entity Cert (w/explicitly permitted subjects) |
	| SubjectAltName Extension |		| SubjectAltName Extension |
	| rfc822Name: student@allowed.example.com |		| rfc822Name: student@allowed.example.com |
	| smtputf8Name: \u8001\u5E2B@allowed.example.com |		| smtpUtf8Name: \u8001\u5E2B@allowed.example.com |
	+------------------------------------------------------+		+--------------------------------------------------------------+
	|		|
	v		v
	+------------------------------------------------------+		+--------------------------------------------------------------+
	| Entity Cert (w/permitted subject- excluded |		| Entity Cert (w/permitted subject- excluded rfc822Name |
	| rfc822Name does not exclude smtputf8Name) |		| does not exclude smtpUtf8Name) |
	| SubjectAltName Extension |		| SubjectAltName Extension |
	| smtputf8Name: \u4E0D\u5C0D@ignored.example.com |		| smtpUtf8Name: \u4E0D\u5C0D@ignored.allowed.example.com |
	+------------------------------------------------------+		+--------------------------------------------------------------+
	Figure 1		Figure 1
	6. Resource Considerations		6. Deployment Considerations
	For email addresses whose local-part is ASCII it may be more		For email addresses whose local-part is ASCII it may be more
	reasonable to continue using rfc822Name instead of smtputf8Name. Use		reasonable to continue using rfc822Name instead of smtpUtf8Name. The
	of smtputf8Name incurs higher byte representation overhead due to		use of rfc822Name rather than smtputf8Name is currently more likely
	encoding with otherName and the additional OID needed. This document		to be supported. Also use of smtpUtf8Name incurs higher byte
	RECOMMENDS using smtputf8Name when local-part contains non-ASCII		representation overhead due to encoding with otherName and the
	characters, and otherwise rfc822Name.		additional OID needed. This may be offset if domain requires non-
			ASCII characters as smptUtf8Name supports U-label whereas rfc822Name
			supports A-label. This document RECOMMENDS using smtpUtf8Name when
			local-part contains non-ASCII characters, and otherwise rfc822Name.
	7. Security Considerations		7. Security Considerations
	Use for smtputf8Name for certificate subjectAltName (and		Use for smtpUtf8Name for certificate subjectAltName (and
	issuerAltName) will incur many of the same security considerations of		issuerAltName) will incur many of the same security considerations of
	Section 8 in [RFC5280] but further complicated by permitting non-		Section 8 in [RFC5280] but further complicated by permitting non-
	ASCII characters in the email address local-part. As mentioned in		ASCII characters in the email address local-part. As mentioned in
	Section 4.4 of [RFC5890] and in Section 4 of [RFC6532] Unicode		Section 4.4 of [RFC5890] and in Section 4 of [RFC6532] Unicode
	introduces the risk for visually similar characters which can be		introduces the risk for visually similar characters which can be
	exploited to deceive the recipient. The former document references		exploited to deceive the recipient. The former document references
	some means to mitigate against these attacks.		some means to mitigate against these attacks.
	8. IANA Considerations		8. IANA Considerations
	This document makes use of object identifiers for the smtputf8Name		This document makes use of object identifiers for the smtpUtf8Name
	defined in Section Section 3 and the ASN.1 module identifier defined		defined in Section Section 3 and the ASN.1 module identifier defined
	in Section Appendix A. IANA is kindly requested to make the		in Section Appendix A. IANA is kindly requested to make the
	following assignments for:		following assignments for:
	The LAMPS-EaiAddresses-2016 ASN.1 module in the "SMI Security for		The LAMPS-EaiAddresses-2016 ASN.1 module in the "SMI Security for
	PKIX Module Identifier" registry (1.3.6.1.5.5.7.0).		PKIX Module Identifier" registry (1.3.6.1.5.5.7.0).
	The smtputf8Name otherName in the "PKIX Other Name Forms" registry		The smtpUtf8Name otherName in the "PKIX Other Name Forms" registry
	(1.3.6.1.5.5.7.8).		(1.3.6.1.5.5.7.8).
	9. References		9. References
	9.1. Normative References		9.1. Normative References
	[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate		[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
	Requirement Levels", BCP 14, RFC 2119,		Requirement Levels", BCP 14, RFC 2119,
	DOI 10.17487/RFC2119, March 1997,		DOI 10.17487/RFC2119, March 1997,
	<http://www.rfc-editor.org/info/rfc2119>.		<http://www.rfc-editor.org/info/rfc2119>.
	skipping to change at page 8, line 36 ¶		skipping to change at page 8, line 7 ¶
	2012, <http://www.rfc-editor.org/info/rfc6532>.		2012, <http://www.rfc-editor.org/info/rfc6532>.
	9.2. Informative References		9.2. Informative References
	[RFC5322] Resnick, P., Ed., "Internet Message Format", RFC 5322,		[RFC5322] Resnick, P., Ed., "Internet Message Format", RFC 5322,
	DOI 10.17487/RFC5322, October 2008,		DOI 10.17487/RFC5322, October 2008,
	<http://www.rfc-editor.org/info/rfc5322>.		<http://www.rfc-editor.org/info/rfc5322>.
	Appendix A. ASN.1 Module		Appendix A. ASN.1 Module
	The following ASN.1 module normatively specifies the Smtputf8Name		The following ASN.1 module normatively specifies the smtpUtf8Name
	structure. This specification uses the ASN.1 definitions from		structure. This specification uses the ASN.1 definitions from
	[RFC5912] with the 2002 ASN.1 notation used in that document.		[RFC5912] with the 2002 ASN.1 notation used in that document.
	LAMPS-EaiAddresses-2016		LAMPS-EaiAddresses-2016
	{ iso(1) identified-organization(3) dod(6)		{ iso(1) identified-organization(3) dod(6)
	internet(1) security(5) mechanisms(5) pkix(7) id-mod(0)		internet(1) security(5) mechanisms(5) pkix(7) id-mod(0)
	id-mod-lamps-eai-addresses-2016(TBD) }		id-mod-lamps-eai-addresses-2016(TBD) }
	DEFINITIONS IMPLICIT TAGS ::=		DEFINITIONS IMPLICIT TAGS ::=
	BEGIN		BEGIN
	IMPORTS		IMPORTS
			OTHER-NAME
			FROM PKIX1Implicit-2009
			{ iso(1) identified-organization(3) dod(6) internet(1) security(5)
			mechanisms(5) pkix(7) id-mod(0) id-mod-pkix1-implicit-02(59) }
	id-pkix OBJECT IDENTIFIER ::=		id-pkix
	{iso(1) identified-organization(3) dod(6) internet(1) security(5)		FROM PKIX1Explicit-2009
	mechanisms(5) pkix(7)}		{ iso(1) identified-organization(3) dod(6) internet(1) security(5)
			mechanisms(5) pkix(7) id-mod(0) id-mod-pkix1-explicit-02(51) }
	--		--
	-- otherName carries additional name types for subjectAltName, issuerAltName,		-- otherName carries additional name types for subjectAltName, issuerAltName,
	-- and other uses of GeneralNames.		-- and other uses of GeneralNames.
	--		--
	id-on OBJECT IDENTIFIER ::= { id-pkix 8 }		id-on OBJECT IDENTIFIER ::= { id-pkix 8 }
	SmtpUtf8OtherNames OTHER-NAME ::= { on-smtputf8Name, ... }		SmtpUtf8OtherNames OTHER-NAME ::= { on-smtpUtf8Name, ... }
	on-smtputf8Name OTHER-NAME ::= {		on-smtpUtf8Name OTHER-NAME ::= {
	SmtpUtf8Name IDENTIFIED BY id-on-smtputf8Name		smtpUtf8Name IDENTIFIED BY id-on-smtpUtf8Name
	}		}
	id-on-smtputf8Name OBJECT IDENTIFIER ::= { id-on TBD }		id-on-smtpUtf8Name OBJECT IDENTIFIER ::= { id-on 9 }
	SmtpUtf8Name ::= UTF8String (SIZE (1..MAX))		SmtpUtf8Name ::= UTF8String (SIZE (1..MAX))
	END		END
	Figure 2		Figure 2
	Appendix B. Acknowledgements		Appendix B. Example of smtpUtf8Name
			This non-normative example demonstrates using smtpUtf8Name as an
			otherName in GeneralName to encode the email address
			"\u8001\u5E2B@example.com".
			The hexidecimal DER encoding of the email address is:
			A022060A 2B060105 05070012 0809A014 0C12E880 81E5B8AB 40657861 6D706C65 2E636F6D
			The text decoding is:
			0 34: [0] {
			2 10: OBJECT IDENTIFIER '1 3 6 1 5 5 7 0 18 8 9'
			14 20: [0] {
			16 18: UTF8String '..@example.com'
			: }
			: }
			Figure 3
			The example was encoded on the OSS Nokalva ASN.1 Playground and the
			above text decoding is an output of Peter Gutmann's "dumpasn1"
			program.
			Appendix C. Acknowledgements
	Thank you to Magnus Nystrom for motivating this document. Thanks to		Thank you to Magnus Nystrom for motivating this document. Thanks to
	Russ Housley, Nicolas Lidzborski, Laetitia Baudoin, Ryan Sleevi, Sean		Russ Housley, Nicolas Lidzborski, Laetitia Baudoin, Ryan Sleevi, Sean
	Leonard, Sean Turner, and Jim Schaad for their feedback. Also thanks		Leonard, and Sean Turner for their feedback. Also special thanks to
	to John Klensin for his valuable input on internationalization,		John Klensin for his valuable input on internationalization, Unicode
	Unicode and ABNF formatting.		and ABNF formatting, and to Jim Schaad for his help with the ASN.1
			example and his helpful feedback.
	Authors' Addresses		Authors' Addresses
	Alexey Melnikov (editor)		Alexey Melnikov (editor)
	Isode Ltd		Isode Ltd
	14 Castle Mews		14 Castle Mews
	Hampton, Middlesex TW12 2NP		Hampton, Middlesex TW12 2NP
	UK		UK
	Email: Alexey.Melnikov@isode.com		Email: Alexey.Melnikov@isode.com
	Weihaw Chuang (editor)		Weihaw Chuang (editor)
	Google, Inc.		Google, Inc.
	1600 Amphitheatre Parkway		1600 Amphitheatre Parkway
	Mountain View, CA 94043		Mountain View, CA 94043
	US		US
	Email: weihaw@google.com		Email: weihaw@google.com
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