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* g10.c (main): Add --symmetric --encrypt command. This generates a

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message that can be decrypted via a passphrase or public key system.

* main.h, encode.c (encode_seskey): Allow passing in an already-created
session key dek. (encode_simple): Use the actual symmetric cipher when
encrypting a session key for a symmetric message. (encode_crypt): Add a
flag to trigger a hybrid mode that can be decrypted via a passphrase or a
pk.  Change all callers.

* mainproc.c (symkey_decrypt_sesskey): There is no way to tell the
difference here between a bad passphrase and a cipher algorithm that we
don't have, so use a error message that makes that clear. Use the actual
list of ciphers when checking whether a cipher is invalid.  Return error
if the decrypted cipher algorithm is invalid. (proc_symkey_enc): In a
mixed passphrase/pk message, if a valid dek already exists from decrypting
via pk, do not try to process the passphrase. (proc_symkey_enc): Indicate
when we're decrypting a session key as opposed to decrypting data.  If a
passphrase is invalid, discard the dek so we'll keep trying.
This commit is contained in:
David Shaw 2003-10-26 03:26:14 +00:00
parent d30da9ebdc
commit bb7986e9a6
5 changed files with 185 additions and 53 deletions
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34
g10/g10.c
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@ -80,7 +80,8 @@ enum cmd_and_opt_values
oShowNotation,
oNoShowNotation,
aEncrFiles,
aDecryptFiles,
aEncrSym,
aDecryptFiles,
aClearsign,
aStore,
aKeygen,
@ -866,6 +867,10 @@ set_cmd( enum cmd_and_opt_values *ret_cmd, enum cmd_and_opt_values new_cmd )
cmd = aSignSym;
else if( cmd == aSym && new_cmd == aSign )
cmd = aSignSym;
else if( cmd == aSym && new_cmd == aEncr )
cmd = aEncrSym;
else if( cmd == aEncr && new_cmd == aSym )
cmd = aEncrSym;
else if( cmd == aKMode && new_cmd == aSym )
cmd = aKModeC;
else if( ( cmd == aSign && new_cmd == aClearsign )
@ -2255,6 +2260,9 @@ main( int argc, char **argv )
case aSym:
cmdname="--symmetric";
break;
case aEncrSym:
cmdname="--symmetric --encrypt";
break;
case aStore:
cmdname="--store";
break;
@ -2450,12 +2458,32 @@ main( int argc, char **argv )
{
if( argc > 1 )
wrong_args(_("--encrypt [filename]"));
if( (rc = encode_crypt(fname,remusr)) )
if( (rc = encode_crypt(fname,remusr,0)) )
log_error("%s: encryption failed: %s\n",
print_fname_stdin(fname), g10_errstr(rc) );
}
break;
case aEncrSym:
/* This works with PGP 8. It doesn't work with 2 or 6. It
might work with 7, but alas, I don't have a copy to test
with right now. */
if( argc > 1 )
wrong_args(_("--symmetric --encrypt [filename]"));
else if(opt.s2k_mode==0)
log_error(_("you cannot use --symmetric --encrypt"
" with --s2k-mode 0\n"));
else if(PGP2 || PGP6 || PGP7 || RFC1991)
log_error(_("you cannot use --symmetric --encrypt"
" while in %s mode\n"),compliance_option_string());
else
{
if( (rc = encode_crypt(fname,remusr,1)) )
log_error("%s: encryption failed: %s\n",
print_fname_stdin(fname), g10_errstr(rc) );
}
break;
case aSign: /* sign the given file */
sl = NULL;
if( detached_sig ) { /* sign all files */