/** \ingroup rpmpgp
* Return hex formatted representation of a multiprecision integer.
* @param p bytes
* @return hex formatted string (malloc'ed)
*/
static inline
char * pgpMpiStr(const uint8_t *p)
{
char *str = NULL;
char *hex = pgpHexStr(p+2, pgpMpiLen(p)-2);
rasprintf(&str, "[%4u]: %s", pgpGrab(p, (size_t) 2), hex);
free(hex);
return str;
}
static int pgpSetKeyMpiDSA(pgpDigAlg pgpkey, int num, const uint8_t *p)
{
BIGNUM *bn;
size_t mlen = pgpMpiLen(p) - 2;
struct pgpDigKeyDSA_s *key = pgpkey->data;
if (!key) {
key = pgpkey->data = xcalloc(1, sizeof(*key));
}
/* Create a BIGNUM from the key pointer.
Note: this assumes big-endian data as required
by the PGP multiprecision integer format
(RFC4880, Section 3.2) */
bn = BN_bin2bn(p+2, mlen, NULL);
if (!bn) return 1;
switch (num) {
case 0:
/* Prime */
if (key->p) {
/* This should only ever happen once per key */
return 1;
}
key->p = bn;
break;
case 1:
/* Subprime */
if (key->q) {
/* This should only ever happen once per key */
return 1;
}
key->q = bn;
break;
case 2:
/* Base */
if (key->g) {
/* This should only ever happen once per key */
return 1;
}
key->g = bn;
break;
case 3:
/* Public */
if (key->y) {
/* This should only ever happen once per key */
return 1;
}
key->y = bn;
break;
}
return 0;
}
static int pgpSetSigMpiDSA(pgpDigAlg pgpsig, int num, const uint8_t *p)
{
BIGNUM *bn = NULL;
int mlen = pgpMpiLen(p) - 2;
int rc = 1;
struct pgpDigSigDSA_s *sig = pgpsig->data;
if (!sig) {
sig = xcalloc(1, sizeof(*sig));
}
/* Create a BIGNUM from the signature pointer.
Note: this assumes big-endian data as required
by the PGP multiprecision integer format
(RFC4880, Section 3.2) */
bn = BN_bin2bn(p+2, mlen, NULL);
if (!bn) return 1;
switch (num) {
case 0:
if (sig->r) {
/* This should only ever happen once per signature */
BN_free(bn);
return 1;
}
sig->r = bn;
rc = 0;
break;
case 1:
if (sig->s) {
/* This should only ever happen once per signature */
BN_free(bn);
return 1;
}
sig->s = bn;
rc = 0;
break;
}
pgpsig->data = sig;
return rc;
}
static int pgpSetSigMpiRSA(pgpDigAlg pgpsig, int num, const uint8_t *p)
{
BIGNUM *bn = NULL;
int mlen = pgpMpiLen(p) - 2;
int rc = 1;
struct pgpDigSigRSA_s *sig = pgpsig->data;
if (!sig) {
sig = xcalloc(1, sizeof(*sig));
}
switch (num) {
case 0:
if (sig->bn) {
/* This should only ever happen once per signature */
return 1;
}
bn = sig->bn = BN_new();
if (!bn) return 1;
/* Create a BIGNUM from the signature pointer.
Note: this assumes big-endian data as required
by the PGP multiprecision integer format
(RFC4880, Section 3.2)
This will be useful later, as we can
retrieve this value with appropriate
padding. */
bn = BN_bin2bn(p+2, mlen, bn);
if (!bn) return 1;
sig->bn = bn;
sig->len = mlen;
pgpsig->data = sig;
rc = 0;
break;
}
return rc;
}
static int pgpSetKeyMpiRSA(pgpDigAlg pgpkey, int num, const uint8_t *p)
{
size_t mlen = pgpMpiLen(p) - 2;
struct pgpDigKeyRSA_s *key = pgpkey->data;
if (!key) {
key = pgpkey->data = xcalloc(1, sizeof(*key));
}
switch (num) {
case 0:
/* Modulus */
if (key->n) {
/* This should only ever happen once per key */
return 1;
}
key->nbytes = mlen;
/* Create a BIGNUM from the pointer.
Note: this assumes big-endian data as required by PGP */
key->n = BN_bin2bn(p+2, mlen, NULL);
if (!key->n) return 1;
break;
case 1:
/* Exponent */
if (key->e) {
/* This should only ever happen once per key */
return 1;
}
/* Create a BIGNUM from the pointer.
Note: this assumes big-endian data as required by PGP */
key->e = BN_bin2bn(p+2, mlen, NULL);
if (!key->e) return 1;
break;
}
return 0;
}
