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Some compatibility polish for PGP2. Add a fake IDEA preference for v3

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keys (this is in the RFC), so that they can be (sometimes) used along
OpenPGP keys.  Do not force using IDEA on an OpenPGP key, as this may
violate its prefs.
Also, revise the help text for the sig class explanation.
This commit is contained in:
David Shaw 2002-01-22 20:39:10 +00:00
parent 5a92c6052f
commit 1dbd67b96a
9 changed files with 94 additions and 17 deletions
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21
g10/encode.c
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@ -284,7 +284,7 @@ encode_crypt( const char *filename, STRLIST remusr )
{
log_info(_("you can only encrypt to RSA keys of 2048 bits or "
"less in --pgp2 mode\n"));
log_info(_("this message will not be usable by PGP 2.x\n"));
log_info(_("this message may not be usable by PGP 2.x\n"));
opt.pgp2=0;
break;
}
@ -333,8 +333,23 @@ encode_crypt( const char *filename, STRLIST remusr )
cfx.dek = m_alloc_secure_clear (sizeof *cfx.dek);
if( !opt.def_cipher_algo ) { /* try to get it from the prefs */
cfx.dek->algo = select_algo_from_prefs( pk_list, PREFTYPE_SYM );
if( cfx.dek->algo == -1 )
cfx.dek->algo = DEFAULT_CIPHER_ALGO;
/* The only way select_algo_from_prefs can fail here is when
mixing v3 and v4 keys, as v4 keys have an implicit
preference entry for 3DES, and the pk_list cannot be empty.
In this case, use 3DES anyway as it's the safest choice -
perhaps the v3 key is being used in an OpenPGP
implementation and we know that the implementation behind
any v4 key can handle 3DES. */
if( cfx.dek->algo == -1 ) {
cfx.dek->algo = CIPHER_ALGO_3DES;
if( opt.pgp2 ) {
log_info(_("unable to use the IDEA cipher for all of the keys "
"you are encrypting to.\n"));
log_info(_("this message may not be usable by PGP 2.x\n"));
opt.pgp2=0;
}
}
}
else
cfx.dek->algo = opt.def_cipher_algo;