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gpg: Add build and runtime support for larger RSA keys

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* configure.ac: Added --enable-large-secmem option.
* g10/options.h: Add opt.flags.large_rsa.
* g10/gpg.c: Contingent on configure option: adjust secmem size,
add gpg --enable-large-rsa, bound to opt.flags.large_rsa.
* g10/keygen.c: Adjust max RSA size based on opt.flags.large_rsa
* doc/gpg.texi: Document --enable-large-rsa.

--

This is a cherry-pick of 534e2876ac from
STABLE-BRANCH-1-4 against master

Some older implementations built and used RSA keys up to 16Kib, but
the larger secret keys now fail when used by more recent GnuPG, due to
secure memory limitations.

Building with ./configure --enable-large-secmem will make gpg
capable of working with those secret keys, as well as permitting the
use of a new gpg option --enable-large-rsa, which let gpg generate RSA
keys up to 8Kib when used with --batch --gen-key.

Debian-bug-id: 739424

Minor edits by wk.

GnuPG-bug-id: 1732
This commit is contained in:
Daniel Kahn Gillmor 2014-10-09 16:54:15 -04:00 • committed by Werner Koch
parent 2ca90f78ce
commit 6cabb7a2a1
5 changed files with 49 additions and 3 deletions
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9
doc/gpg.texi
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@ -1181,6 +1181,15 @@ the opposite meaning. The options are:
validation. This option is only meaningful if pka-lookups is set.
@end table
@item --enable-large-rsa
@itemx --disable-large-rsa
@opindex enable-large-rsa
@opindex disable-large-rsa
With --gen-key and --batch, enable the creation of larger RSA secret
keys than is generally recommended (up to 8192 bits). These large
keys are more expensive to use, and their signatures and
certifications are also larger.
@item --enable-dsa2
@itemx --disable-dsa2
@opindex enable-dsa2