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* keygen.c (keygen_set_std_prefs, add_feature_mdc): Use "mdc" and "no-mdc"

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in the prefs string to allow switching on and off the MDC feature.  This
is needed to properly export a key from GnuPG for use on PGP which does
not support MDC - without this, MDC-capable implementations will still try
and generate MDCs which will break PGP.

* keygen.c (keygen_get_std_prefs): Show "[mdc]" in prefs string if it is
enabled.

* options.h, g10.c (main), cipher.c (write_header), keygen.c
(keygen_set_std_prefs): For consistency, allow the user to specify
mdc/no-mdc in the --personal-preference-list.  If disabled, it acts just
like --disable-mdc.
This commit is contained in:
David Shaw 2002-05-29 20:52:51 +00:00
parent e77b643b4a
commit da3f17990c
5 changed files with 65 additions and 17 deletions
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17
g10/ChangeLog
View File

@ -1,3 +1,20 @@
2002-05-29 David Shaw <dshaw@jabberwocky.com>
* keygen.c (keygen_set_std_prefs, add_feature_mdc): Use "mdc" and
"no-mdc" in the prefs string to allow switching on and off the MDC
feature. This is needed to properly export a key from GnuPG for
use on PGP which does not support MDC - without this, MDC-capable
implementations will still try and generate MDCs which will break
PGP.
* keygen.c (keygen_get_std_prefs): Show "[mdc]" in prefs string if
it is enabled.
* options.h, g10.c (main), cipher.c (write_header), keygen.c
(keygen_set_std_prefs): For consistency, allow the user to specify
mdc/no-mdc in the --personal-preference-list. If disabled, it
acts just like --disable-mdc.
2002-05-29 David Shaw <dshaw@jabberwocky.com>
* options.h, exec.c: Add some debugging info, using the 1024 debug

4
g10/cipher.c
View File

@ -64,7 +64,7 @@ write_header( cipher_filter_context_t *cfx, IOBUF a )
if (opt.force_mdc)
use_mdc = 1;
if( opt.rfc2440 || opt.rfc1991 || opt.disable_mdc )
if( opt.rfc2440 || opt.rfc1991 || opt.disable_mdc || !opt.personal_mdc )
use_mdc = 0; /* override - rfc2440 does not know about MDC */
memset( &ed, 0, sizeof ed );
@ -165,5 +165,3 @@ cipher_filter( void *opaque, int control,
}
return rc;
}

1
g10/g10.c
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@ -850,6 +850,7 @@ main( int argc, char **argv )
opt.def_digest_algo = 0;
opt.cert_digest_algo = 0;
opt.def_compress_algo = -1;
opt.personal_mdc = 1; /* default - we like to use mdc if we can */
opt.s2k_mode = 3; /* iterated+salted */
opt.s2k_digest_algo = DIGEST_ALGO_SHA1;
opt.s2k_cipher_algo = CIPHER_ALGO_CAST5;

59
g10/keygen.c
View File

@ -106,7 +106,7 @@ static byte hash_prefs[MAX_PREFS];
static int nhash_prefs;
static byte zip_prefs[MAX_PREFS];
static int nzip_prefs;
static int mdc_available;
static void do_generate_keypair( struct para_data_s *para,
struct output_control_s *outctrl );
@ -215,7 +215,7 @@ int
keygen_set_std_prefs (const char *string,int personal)
{
byte sym[MAX_PREFS], hash[MAX_PREFS], zip[MAX_PREFS];
int nsym=0, nhash=0, nzip=0;
int nsym=0, nhash=0, nzip=0, mdc=1; /* mdc defaults on */
ulong val;
const char *s, *s2;
int rc = 0;
@ -255,6 +255,14 @@ keygen_set_std_prefs (const char *string,int personal)
if (set_one_pref (val, 'Z', check_zip_algo, zip, &nzip))
rc = -1;
}
else if (ascii_strcasecmp(s,"mdc")==0) {
mdc=1;
s2=s+3;
}
else if (ascii_strcasecmp(s,"no-mdc")==0) {
mdc=0;
s2=s+6;
}
else if (isspace (*s))
s2 = s+1;
else {
@ -289,11 +297,14 @@ keygen_set_std_prefs (const char *string,int personal)
opt.personal_prefs[n].type = PREFTYPE_NONE; /* end of list marker */
opt.personal_prefs[n].value = 0;
}
opt.personal_mdc = mdc;
}
else {
memcpy (sym_prefs, sym, (nsym_prefs=nsym));
memcpy (hash_prefs, hash, (nhash_prefs=nhash));
memcpy (zip_prefs, zip, (nzip_prefs=nzip));
mdc_available = mdc;
prefs_initialized = 1;
}
}
@ -313,7 +324,7 @@ keygen_get_std_prefs ()
if (!prefs_initialized)
keygen_set_std_prefs (NULL,0);
buf = m_alloc ( MAX_PREFS*3*5 + 1);
buf = m_alloc ( MAX_PREFS*3*5 + 5 + 1);
*buf = 0;
for (i=0; i < nsym_prefs; i++ )
sprintf (buf+strlen(buf), "S%d ", sym_prefs[i]);
@ -321,23 +332,30 @@ keygen_get_std_prefs ()
sprintf (buf+strlen(buf), "H%d ", hash_prefs[i]);
for (i=0; i < nzip_prefs; i++ )
sprintf (buf+strlen(buf), "Z%d ", zip_prefs[i]);
if (*buf) /* trim the trailing space */
buf[strlen(buf)-1] = 0;
if(mdc_available)
sprintf(buf+strlen(buf),"[mdc]");
else if (*buf) /* trim the trailing space */
buf[strlen(buf)-1] = 0;
return buf;
}
static void
add_feature_mdc (PKT_signature *sig)
add_feature_mdc (PKT_signature *sig,int enabled)
{
const byte *s;
size_t n;
int i;
char *buf;
s = parse_sig_subpkt (sig->hashed, SIGSUBPKT_FEATURES, &n );
if (s && n && (s[0] & 0x01))
return; /* already set */
/* Already set or cleared */
if (s && n &&
((enabled && (s[0] & 0x01)) || (!enabled && !(s[0] & 0x01))))
return;
if (!s || !n) { /* create a new one */
n = 1;
buf = m_alloc_clear (n);
@ -346,12 +364,25 @@ add_feature_mdc (PKT_signature *sig)
buf = m_alloc (n);
memcpy (buf, s, n);
}
buf[0] |= 0x01; /* MDC feature */
build_sig_subpkt (sig, SIGSUBPKT_FEATURES, buf, n);
if(enabled)
buf[0] |= 0x01; /* MDC feature */
else
buf[0] &= ~0x01;
/* Are there any bits set? */
for(i=0;i<n;i++)
if(buf[i]!=0)
break;
if(i==n)
delete_sig_subpkt (sig->hashed, SIGSUBPKT_FEATURES);
else
build_sig_subpkt (sig, SIGSUBPKT_FEATURES, buf, n);
m_free (buf);
}
int
keygen_upd_std_prefs( PKT_signature *sig, void *opaque )
{
@ -382,8 +413,8 @@ keygen_upd_std_prefs( PKT_signature *sig, void *opaque )
delete_sig_subpkt (sig->unhashed, SIGSUBPKT_PREF_COMPR);
}
/* Make sure that the MDC feature flag is set */
add_feature_mdc (sig);
/* Make sure that the MDC feature flag is set if needed */
add_feature_mdc (sig,mdc_available);
return 0;
}

1
g10/options.h
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@ -127,6 +127,7 @@ struct {
int exec_disable;
char *def_preference_list;
prefitem_t *personal_prefs;
int personal_mdc;
int no_perm_warn;
char *temp_dir;
int no_encrypt_to;