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scd: Force key attribute change for writekey.

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* scd/app-openpgp.c (change_rsa_keyattr): New.
(change_keyattr_from_string): Use change_rsa_keyattr.
(rsa_writekey): Call change_rsa_keyattr when different size.
(ecc_writekey): Try to change key attribute.
This commit is contained in:
NIIBE Yutaka 2015-09-07 13:49:47 +09:00
parent fd689e8542
commit f10b427d0e
1 changed files with 62 additions and 33 deletions
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95
scd/app-openpgp.c
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@ -2729,6 +2729,43 @@ change_keyattr (app_t app, int keyno, const unsigned char *buf, size_t buflen,
} }
static gpg_error_t
change_rsa_keyattr (app_t app, int keyno, unsigned int nbits,
gpg_error_t (*pincb)(void*, const char *, char **),
void *pincb_arg)
{
gpg_error_t err = 0;
unsigned char *buf;
size_t buflen;
void *relptr;
/* Read the current attributes into a buffer. */
relptr = get_one_do (app, 0xC1+keyno, &buf, &buflen, NULL);
if (!relptr)
err = gpg_error (GPG_ERR_CARD);
else if (buflen < 6 || buf[0] != PUBKEY_ALGO_RSA)
{
/* Attriutes too short or not an RSA key. */
xfree (relptr);
err = gpg_error (GPG_ERR_CARD);
}
else
{
/* We only change n_bits and don't touch anything else. Before we
do so, we round up NBITS to a sensible way in the same way as
gpg's key generation does it. This may help to sort out problems
with a few bits too short keys. */
nbits = ((nbits + 31) / 32) * 32;
buf[1] = (nbits >> 8);
buf[2] = nbits;
err = change_keyattr (app, keyno, buf, buflen, pincb, pincb_arg);
xfree (relptr);
}
return err;
}
/* Helper to process an setattr command for name KEY-ATTR. /* Helper to process an setattr command for name KEY-ATTR.
In (VALUE,VALUELEN), it expects following string: In (VALUE,VALUELEN), it expects following string:
RSA: "--force <key> <algo> rsa<nbits>" RSA: "--force <key> <algo> rsa<nbits>"
@ -2779,36 +2816,7 @@ change_keyattr_from_string (app_t app,
else if (nbits > 4096) else if (nbits > 4096)
err = gpg_error (GPG_ERR_TOO_LARGE); err = gpg_error (GPG_ERR_TOO_LARGE);
else else
{ err = change_rsa_keyattr (app, keyno, nbits, pincb, pincb_arg);
unsigned char *buf;
size_t buflen;
void *relptr;
/* Read the current attributes into a buffer. */
relptr = get_one_do (app, 0xC1+keyno, &buf, &buflen, NULL);
if (!relptr)
{
err = gpg_error (GPG_ERR_CARD);
goto leave;
}
if (buflen < 6 || buf[0] != PUBKEY_ALGO_RSA)
{
/* Attriutes too short or not an RSA key. */
xfree (relptr);
err = gpg_error (GPG_ERR_CARD);
goto leave;
}
/* We only change n_bits and don't touch anything else. Before we
do so, we round up NBITS to a sensible way in the same way as
gpg's key generation does it. This may help to sort out problems
with a few bits too short keys. */
nbits = ((nbits + 31) / 32) * 32;
buf[1] = (nbits >> 8);
buf[2] = nbits;
err = change_keyattr (app, keyno, buf, buflen, pincb, pincb_arg);
xfree (relptr);
}
} }
else if (algo == PUBKEY_ALGO_ECDH || algo == PUBKEY_ALGO_ECDSA else if (algo == PUBKEY_ALGO_ECDH || algo == PUBKEY_ALGO_ECDSA
|| algo == PUBKEY_ALGO_EDDSA) || algo == PUBKEY_ALGO_EDDSA)
@ -2971,6 +2979,14 @@ rsa_writekey (app_t app, gpg_error_t (*pincb)(void*, const char *, char **),
if (opt.verbose) if (opt.verbose)
log_info ("RSA modulus size is %u bits (%u bytes)\n", log_info ("RSA modulus size is %u bits (%u bytes)\n",
nbits, (unsigned int)rsa_n_len); nbits, (unsigned int)rsa_n_len);
if (nbits && nbits != maxbits
&& app->app_local->extcap.algo_attr_change)
{
/* Try to switch the key to a new length. */
err = change_rsa_keyattr (app, keyno, nbits, pincb, pincb_arg);
if (!err)
maxbits = app->app_local->keyattr[keyno].rsa.n_bits;
}
if (nbits != maxbits) if (nbits != maxbits)
{ {
log_error (_("RSA modulus missing or not of size %d bits\n"), log_error (_("RSA modulus missing or not of size %d bits\n"),
@ -3327,9 +3343,22 @@ ecc_writekey (app_t app, gpg_error_t (*pincb)(void*, const char *, char **),
|| app->app_local->keyattr[keyno].ecc.oid != oidstr || app->app_local->keyattr[keyno].ecc.oid != oidstr
|| app->app_local->keyattr[keyno].ecc.flags != flag_djb_tweak) || app->app_local->keyattr[keyno].ecc.flags != flag_djb_tweak)
{ {
log_error ("key attribute on card doesn't match\n"); if (app->app_local->extcap.algo_attr_change)
err = gpg_error (GPG_ERR_INV_VALUE); {
goto leave; unsigned char keyattr[oid_len];
keyattr[0] = algo;
memcpy (keyattr+1, oidbuf+1, oid_len-1);
err = change_keyattr (app, keyno, keyattr, oid_len, pincb, pincb_arg);
if (err)
goto leave;
}
else
{
log_error ("key attribute on card doesn't match\n");
err = gpg_error (GPG_ERR_INV_VALUE);
goto leave;
}
} }
if (opt.verbose) if (opt.verbose)