int upton_modmult (unitptr prod, unitptr multiplicand, unitptr multiplier)
{
unitptr d = d_data;
while (mp_compare(d,modulus) > 0)
memcpy((void*)(prod), (const void*)(d), (global_precision));
}
/* Adds (prepends) key file to key ring file. */
int _addto_keyring(char *keyfile, char *ringfile)
{
FILE *f, *g, *h;
long file_position, fp;
int pktlen;
byte ctb;
int status;
unit n[MAX_UNIT_PRECISION], e[MAX_UNIT_PRECISION];
unit n1[MAX_UNIT_PRECISION];
byte keyID[KEYFRAGSIZE];
byte userid[256]; /* key certificate userid */
byte userid1[256];
word32 tstamp;
byte *timestamp = (byte *) & tstamp; /* key certificate timestamp */
boolean userid_seen = FALSE;
int commonkeys = 0;
int copying;
struct newkey *nkey, *nkeys = NULL;
char *scratchf;
/* open file f for read, in binary (not text) mode... */
if ((f = fopen(keyfile, FOPRBIN)) == NULL) {
fprintf(pgpout, LANG("\n\007Can't open key file '%s'\n"), keyfile);
return -1;
}
ctb = 0;
if (fread(&ctb, 1, 1, f) != 1 || !is_key_ctb(ctb)) {
fclose(f);
return -1;
}
rewind(f);
setoutdir(ringfile);
scratchf = tempfile(0);
/*
* get userids from both files, maybe should also use the default public
* keyring if ringfile is not the default ring.
*/
setkrent(ringfile);
setkrent(keyfile);
init_userhash();
if (!file_exists(ringfile)) {
/* ringfile does not exist. Can it be created? */
/* open file g for writing, in binary (not text) mode... */
g = fopen(ringfile, FOPWBIN);
if (g == NULL) {
fprintf(pgpout,
LANG("\nKey ring file '%s' cannot be created.\n"),
ringfile);
fclose(f);
goto err;
}
fclose(g);
}
/* Create working output file */
/* open file g for writing, in binary (not text) mode... */
if ((g = fopen(scratchf, FOPWBIN)) == NULL) {
fclose(f);
goto err;
}
newkeys = newsigs = newids = newrvks = 0;
/* Pass 1 - copy all keys from f which aren't in ring file */
/* Also copy userid and signature packets. */
fprintf(pgpout, LANG("\nLooking for new keys...\n"));
copying = FALSE;
if (gpk_open(ringfile) < 0) {
fclose(f); /* close key file */
fclose(g);
goto err;
}
for (;;) {
file_position = ftell(f);
status = readkeypacket(f, FALSE, &ctb,
timestamp, (char *) userid, n, e,
NULL, NULL, NULL, NULL, NULL, NULL);
/* Note that readkeypacket has called set_precision */
if (status == -1) /* EOF */
break;
if (status == -2 || status == -3) {
fprintf(pgpout,
LANG("\n\007Could not read key from file '%s'.\n"),
keyfile);
fclose(f); /* close key file */
fclose(g);
goto err;
}
if (status < 0) {
copying = FALSE;
continue; /* don't merge keys from unrecognized version */
}
/* Check to see if key is already on key ring */
if (is_key_ctb(ctb)) {
extract_keyID(keyID, n); /* from keyfile, not ringfile */
publickey = is_ctb_type(ctb, CTB_CERT_PUBKEY_TYPE);
/* Check for duplicate key in key ring: */
status = get_publickey(&fp, NULL, keyID, timestamp, userid, n1, e);
if (status == 0) {
/* key in both keyring and keyfile */
if (mp_compare(n, n1) != 0) {
fprintf(pgpout,
LANG("\n\007Warning: Key ID %s matches key ID of key already on \n\
key ring '%s', but the keys themselves differ.\n\
This is highly suspicious. This key will not be added to ring.\n\
Acknowledge by pressing return: "), keyIDstring(keyID), ringfile);
getyesno('n');
} else {
++commonkeys;
}
copying = FALSE;
} else if (status == -1) { /* key NOT in keyring */