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+Internet Engineering Task Force (IETF)                          A. Bryan
+Request for Comments: 5843                                    April 2010
+Category: Informational
+ISSN: 2070-1721
+
+
+          Additional Hash Algorithms for HTTP Instance Digests
+
+Abstract
+
+   The IANA registry named "Hypertext Transfer Protocol (HTTP) Digest
+   Algorithm Values" defines values for digest algorithms used by
+   Instance Digests in HTTP.  Instance Digests in HTTP provide a digest,
+   also known as a checksum or hash, of an entire representation of the
+   current state of a resource.  This document adds new values to the
+   registry and updates previous values.
+
+Status of This Memo
+
+   This document is not an Internet Standards Track specification; it is
+   published for informational purposes.
+
+   This document is a product of the Internet Engineering Task Force
+   (IETF).  It represents the consensus of the IETF community.  It has
+   received public review and has been approved for publication by the
+   Internet Engineering Steering Group (IESG).  Not all documents
+   approved by the IESG are a candidate for any level of Internet
+   Standard; see Section 2 of RFC 5741.
+
+   Information about the current status of this document, any errata,
+   and how to provide feedback on it may be obtained at
+   http://www.rfc-editor.org/info/rfc5843.
+
+Copyright Notice
+
+   Copyright (c) 2010 IETF Trust and the persons identified as the
+   document authors.  All rights reserved.
+
+   This document is subject to BCP 78 and the IETF Trust's Legal
+   Provisions Relating to IETF Documents
+   (http://trustee.ietf.org/license-info) in effect on the date of
+   publication of this document.  Please review these documents
+   carefully, as they describe your rights and restrictions with respect
+   to this document.  Code Components extracted from this document must
+   include Simplified BSD License text as described in Section 4.e of
+   the Trust Legal Provisions and are provided without warranty as
+   described in the Simplified BSD License.
+
+
+
+
+Bryan                         Informational                     [Page 1]
+
+RFC 5843        More Algorithms for HTTP Instance Digests     April 2010
+
+
+Table of Contents
+
+   1. Introduction ....................................................2
+      1.1. Example ....................................................2
+   2. IANA Considerations .............................................2
+      2.1. Previous Registrations Updated .............................2
+      2.2. New Registrations ..........................................3
+   3. Security Considerations .........................................3
+   4. Changes Compared to RFC 3230 ....................................3
+   5. Normative References ............................................4
+   Appendix A. Acknowledgements and Contributors ......................5
+
+1.  Introduction
+
+   The IANA registry named "Hypertext Transfer Protocol (HTTP) Digest
+   Algorithm Values" defines values for digest algorithms used by
+   Instance Digests in HTTP.
+
+   Note: This is unrelated to HTTP Digest Authentication.  Instance
+   Digests in HTTP provide a digest, also known as a checksum or hash,
+   of an entire representation of the current state of a resource.
+
+   The registry was created by [RFC3230] in 2002.  This document adds
+   new values to the registry and updates previous values that had
+   redundant or outdated references.
+
+1.1.  Example
+
+   Example of Instance Digest for SHA-256:
+
+   Digest: SHA-256=MWVkMWQxYTRiMzk5MDQ0MzI3NGU5NDEyZTk5OWY1ZGFmNzgyZTJlO
+   DYzYjRjYzFhOTlmNTQwYzI2M2QwM2U2MQ==
+
+2.  IANA Considerations
+
+   This document makes use of the IANA registry named "Hypertext
+   Transfer Protocol (HTTP) Digest Algorithm Values" specified in
+   [RFC3230].
+
+2.1.  Previous Registrations Updated
+
+   Accordingly, IANA has updated the following registrations:
+
+      Digest Algorithm: MD5
+
+      Description: The MD5 algorithm, as specified in [RFC1321].  The
+      output of this algorithm is encoded using the base64 encoding
+      [RFC4648].
+
+
+
+Bryan                         Informational                     [Page 2]
+
+RFC 5843        More Algorithms for HTTP Instance Digests     April 2010
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+      Reference: [RFC1321], [RFC4648], this document.
+
+      Digest Algorithm: SHA
+
+      Description: The SHA-1 algorithm [FIPS-180-3].  The output of this
+      algorithm is encoded using the base64 encoding [RFC4648].
+
+      Reference: [FIPS-180-3], [RFC4648], this document.
+
+2.2.  New Registrations
+
+   Accordingly, IANA has made the following registrations:
+
+      Digest Algorithm: SHA-256
+
+      Description: The SHA-256 algorithm [FIPS-180-3].  The output of
+      this algorithm is encoded using the base64 encoding [RFC4648].
+
+      Reference: [FIPS-180-3], [RFC4648], this document.
+
+      Digest Algorithm: SHA-512
+
+      Description: The SHA-512 algorithm [FIPS-180-3].  The output of
+      this algorithm is encoded using the base64 encoding [RFC4648].
+
+      Reference: [FIPS-180-3], [RFC4648], this document.
+
+3.  Security Considerations
+
+   Same as [RFC3230].
+
+4.  Changes Compared to RFC 3230
+
+   The reference for base64 encoding has been updated for both MD5 and
+   SHA.
+
+   The reference for SHA has been updated.
+
+   The SHA-256 and SHA-512 algorithms have been added to the registry.
+
+   All other previous values to the registry are still valid.
+
+
+
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+Bryan                         Informational                     [Page 3]
+
+RFC 5843        More Algorithms for HTTP Instance Digests     April 2010
+
+
+5.  Normative References
+
+   [FIPS-180-3]  National Institute of Standards and Technology (NIST),
+                 "Secure Hash Standard (SHS)", FIPS PUB 180-3,
+                 October 2008.
+
+   [RFC1321]     Rivest, R., "The MD5 Message-Digest Algorithm",
+                 RFC 1321, April 1992.
+
+   [RFC3230]     Mogul, J. and A. Van Hoff, "Instance Digests in HTTP",
+                 RFC 3230, January 2002.
+
+   [RFC4648]     Josefsson, S., "The Base16, Base32, and Base64 Data
+                 Encodings", RFC 4648, October 2006.
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+Bryan                         Informational                     [Page 4]
+
+RFC 5843        More Algorithms for HTTP Instance Digests     April 2010
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+Appendix A.  Acknowledgements and Contributors
+
+   Thanks to Mark Nottingham, Eran Hammer-Lahav, Nils Maier, Lisa
+   Dusseault, Alfred Hoenes, Pasi Eronen, Gonzalo Camarillo, Radia
+   Perlman, and Jeffrey Mogul.
+
+Author's Address
+
+   Anthony Bryan
+   Pompano Beach, FL
+   USA
+
+   EMail: anthonybryan@gmail.com
+   URI:   http://www.metalinker.org
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+Bryan                         Informational                     [Page 5]
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