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authorRepo Admin <[email protected]>2002-10-19 07:55:27 +0000
committerRepo Admin <[email protected]>2002-10-19 07:55:27 +0000
commit82a17c9fb3d64ccdd474c3bedf564368f77e84a4 (patch)
tree0c01ee8cea5f6f77e830955c6b97024752740a2b /doc/OpenPGP
parentBumped version number for cvs version (diff)
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- GnuPG and OpenPGP
- =================
-
- See RFC2440 for a description of OpenPGP. We have an annotated version
- of this RFC online: http://www.gnupg.org/rfc2440.html
-
-
-
- Compatibility Notes
- ===================
- GnuPG (>=1.0.3) is in compliance with RFC2440 despite these exceptions:
-
- * (9.2) states that IDEA SHOULD be implemented. This is not done
- due to patent problems.
-
-
- All MAY features are implemented with this exception:
-
- * multi-part armored messages are not supported.
- MIME (rfc2015) should be used instead.
-
- Most of the OPTIONAL stuff is implemented.
-
- There are a couple of options which can be used to override some
- RFC requirements. This is always mentioned with the description
- of that options.
-
- A special format of partial packet length exists for v3 packets
- which can be considered to be in compliance with RFC1991; this
- format is only created if a special option is active.
-
- GnuPG uses a S2K mode of 101 for GNU extensions to the secret key
- protection algorithms. This number is not defined in OpenPGP, but
- given the fact that this number is in a range which used at many
- other places in OpenPGP for private/experimenat algorithm identifiers,
- this should be not a so bad choice. The 3 bytes "GNU" are used
- to identify this as a GNU extension - see the file DETAILS for a
- definition of the used data formats.
-
-
-
- Some Notes on OpenPGP / PGP Compatibility:
- ==========================================
-
- * PGP 5.x does not accept V4 signatures for anything other than
- key material. The GnuPG option --force-v3-sigs mimics this
- behavior.
-
- * PGP 5.x does not recognize the "five-octet" lengths in
- new-format headers or in signature subpacket lengths.
-
- * PGP 5.0 rejects an encrypted session key if the keylength
- differs from the S2K symmetric algorithm. This is a bug in its
- validation function.
-
- * PGP 5.0 does not handle multiple one-pass signature headers and
- trailers. Signing one will compress the one-pass signed literal
- and prefix a V3 signature instead of doing a nested one-pass
- signature.
-
- * When exporting a private key, PGP 2.x generates the header
- "BEGIN PGP SECRET KEY BLOCK" instead of "BEGIN PGP PRIVATE KEY
- BLOCK". All previous versions ignore the implied data type, and
- look directly at the packet data type.
-
- * In a clear-signed signature, PGP 5.0 will figure out the correct
- hash algorithm if there is no "Hash:" header, but it will reject
- a mismatch between the header and the actual algorithm used. The
- "standard" (i.e. Zimmermann/Finney/et al.) version of PGP 2.x
- rejects the "Hash:" header and assumes MD5. There are a number
- of enhanced variants of PGP 2.6.x that have been modified for
- SHA-1 signatures.
-
- * PGP 5.0 can read an RSA key in V4 format, but can only recognize
- it with a V3 keyid, and can properly use only a V3 format RSA
- key.
-
- * Neither PGP 5.x nor PGP 6.0 recognize ElGamal Encrypt and Sign
- keys. They only handle ElGamal Encrypt-only keys.
-
-
- Parts of this document are taken from:
- ======================================
-
- OpenPGP Message Format
- draft-ietf-openpgp-formats-07.txt
-
-
- Copyright 1998 by The Internet Society. All Rights Reserved.
-
- This document and translations of it may be copied and furnished to
- others, and derivative works that comment on or otherwise explain it
- or assist in its implementation may be prepared, copied, published
- and distributed, in whole or in part, without restriction of any
- kind, provided that the above copyright notice and this paragraph
- are included on all such copies and derivative works. However, this
- document itself may not be modified in any way, such as by removing
- the copyright notice or references to the Internet Society or other
- Internet organizations, except as needed for the purpose of
- developing Internet standards in which case the procedures for
- copyrights defined in the Internet Standards process must be
- followed, or as required to translate it into languages other than
- English.
-
- The limited permissions granted above are perpetual and will not be
- revoked by the Internet Society or its successors or assigns.
-
-