< draft-ietf-pkix-sha244-01.txt		draft-ietf-pkix-sha244-02.txt >
	PKIX Working Group R. Housley		PKIX Working Group R. Housley
	Internet Draft Vigil Security		Internet Draft Vigil Security
	Expires in six months December 2003		Expires in six months December 2003
	A 224-bit One-way Hash Function: SHA-224		A 224-bit One-way Hash Function: SHA-224
	<draft-ietf-pkix-sha244-01.txt>		<draft-ietf-pkix-sha244-02.txt>
	Status of this Memo		Status of this Memo
	This document is an Internet-Draft and is in full conformance with		This document is an Internet-Draft and is in full conformance with
	all provisions of Section 10 of RFC 2026. Internet-Drafts are		all provisions of Section 10 of RFC 2026. Internet-Drafts are
	working documents of the Internet Engineering Task Force (IETF), its		working documents of the Internet Engineering Task Force (IETF), its
	areas, and its working groups. Note that other groups may also		areas, and its working groups. Note that other groups may also
	distribute working documents as Internet-Drafts.		distribute working documents as Internet-Drafts.
	Internet-Drafts are draft documents valid for a maximum of six months		Internet-Drafts are draft documents valid for a maximum of six months
	skipping to change at page 1, line 34 ¶		skipping to change at page 1, line 34 ¶
	The list of current Internet-Drafts can be accessed at		The list of current Internet-Drafts can be accessed at
	http://www.ietf.org/ietf/1id-abstracts.txt.		http://www.ietf.org/ietf/1id-abstracts.txt.
	The list of Internet-Drafts Shadow Directories can be accessed at		The list of Internet-Drafts Shadow Directories can be accessed at
	http://www.ietf.org/shadow.html.		http://www.ietf.org/shadow.html.
	Abstract		Abstract
	This document specifies a 224-bit one-way hash function, called		This document specifies a 224-bit one-way hash function, called
	SHA-224. A SHA-224 is based on SHA-256, but it uses an different		SHA-224. A SHA-224 is based on SHA-256, but it uses an different
	initial value and the value is truncated to 224 bits.		initial value and the result is truncated to 224 bits.
	1 Introduction		1 Introduction
	This document specifies a 224-bit one-way hash function, called		This document specifies a 224-bit one-way hash function, called
	SHA-224. One-way hash functions are also known as message digests.		SHA-224. One-way hash functions are also known as message digests.
	SHA-224 is based on SHA-256, the 256-bit one-way hash function		SHA-224 is based on SHA-256, the 256-bit one-way hash function
	already specified by the National Institute of Standards and		already specified by the National Institute of Standards and
	Technology (NIST) [SHA2]. Computation of a SHA-224 hash value is two		Technology (NIST) [SHA2]. Computation of a SHA-224 hash value is two
	steps. First, the SHA-256 hash value is computed, except that a		steps. First, the SHA-256 hash value is computed, except that a
	different initial value is used. Second, the resulting 256-bit hash		different initial value is used. Second, the resulting 256-bit hash
	skipping to change at page 3, line 26 ¶		skipping to change at page 3, line 26 ¶
	3.1 Test Vector #1		3.1 Test Vector #1
	Let the message to be hashed be the 24-bit ASCII string "abc", which		Let the message to be hashed be the 24-bit ASCII string "abc", which
	is equivalent to the following binary string:		is equivalent to the following binary string:
	01100001 01100010 01100011		01100001 01100010 01100011
	The SHA-224 hash value (in hex):		The SHA-224 hash value (in hex):
	<TBD>		23097d22 3405d822 8642a477 bda255b3 2aadbce4 bda0b3f7 e36c9da7
	3.2 Test Vector #2		3.2 Test Vector #2
	Let the message to be hashed be the 448-bit ASCII string		Let the message to be hashed be the 448-bit ASCII string
	"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq".		"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq".
	The SHA-224 hash value is (in hex):		The SHA-224 hash value is (in hex):
	<TBD>		75388b16 512776cc 5dba5da1 fd890150 b0c6455c b4f58b19 52522525
	3.3 Test Vector #3		3.3 Test Vector #3
	Let the message to hashed be the binary-coded form of the ASCII		Let the message to be hashed be the binary-coded form of the ASCII
	string which consists of 1,000,000 repetitions of the character "a".		string which consists of 1,000,000 repetitions of the character "a".
	The SHA-224 hash value is (in hex):		The SHA-224 hash value is (in hex):
	<TBD>		20794655 980c91d8 bbb4c1ea 97618a4b f03f4258 1948b2ee 4ee7ad67
	4 Object Identifier		4 Object Identifier
	NIST has assigned an ASN.1 [X.208-88, X.209-88] object identifier for		NIST has assigned an ASN.1 [X.208-88, X.209-88] object identifier for
	SHA-224. Some protocols use object identifiers to name one-way hash		SHA-224. Some protocols use object identifiers to name one-way hash
	functions. One example is CMS [CMS]. Implementations of such		functions. One example is CMS [CMS]. Implementations of such
	protocols that make use of SHA-224 MUST use the following object		protocols that make use of SHA-224 MUST use the following object
	identifier.		identifier.
	id-sha224 OBJECT IDENTIFIER ::= { joint-iso-itu-t(2)		id-sha224 OBJECT IDENTIFIER ::= { joint-iso-itu-t(2)
	skipping to change at page 5, line 34 ¶		skipping to change at page 5, line 34 ¶
	might or might not be available; neither does it represent that it		might or might not be available; neither does it represent that it
	has made any effort to identify any such rights. Information on the		has made any effort to identify any such rights. Information on the
	IETF's procedures with respect to rights in standards-track and		IETF's procedures with respect to rights in standards-track and
	standards-related documentation can be found in BCP-11. Copies of		standards-related documentation can be found in BCP-11. Copies of
	claims of rights made available for publication and any assurances of		claims of rights made available for publication and any assurances of
	licenses to be made available, or the result of an attempt made to		licenses to be made available, or the result of an attempt made to
	obtain a general license or permission for the use of such		obtain a general license or permission for the use of such
	proprietary rights by implementors or users of this specification can		proprietary rights by implementors or users of this specification can
	be obtained from the IETF Secretariat.		be obtained from the IETF Secretariat.
	7 Author's Address		7 Acknowledgment
			Many thanks to Jim Schaad for generating the test vectors.
			8 Author's Address
	Russell Housley		Russell Housley
	Vigil Security, LLC		Vigil Security, LLC
	918 Spring Knoll Drive		918 Spring Knoll Drive
	Herndon, VA 20170		Herndon, VA 20170
	USA		USA
	housley@vigilsec.com		housley@vigilsec.com
	Full Copyright Statement		Full Copyright Statement
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