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scd: change_keyattr_from_string for ECC.
* scd/app-openpgp.c (change_keyattr, change_keyattr_from_string): Support ECC. (rsa_writekey): Don't change key attribute.
This commit is contained in:
NIIBE Yutaka
parent
f5d356fb5b
commit
9901be3956
@ -57,12 +57,12 @@
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#include "options.h"
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#include "errors.h"
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#include "memory.h"
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#include "util.h"
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#include "cardglue.h"
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#else /* GNUPG_MAJOR_VERSION != 1 */
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#include "scdaemon.h"
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#endif /* GNUPG_MAJOR_VERSION != 1 */
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#include "util.h"
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#include "i18n.h"
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#include "iso7816.h"
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#include "app-common.h"
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@ -2818,54 +2818,25 @@ build_ecc_privkey_template (app_t app, int keyno,
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/* Helper for do_writekley to change the size of a key. Not ethat
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this deletes the entire key without asking. */
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static gpg_error_t
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change_keyattr (app_t app, int keyno, unsigned int nbits,
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change_keyattr (app_t app, int keyno, const unsigned char *buf, size_t buflen,
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gpg_error_t (*pincb)(void*, const char *, char **),
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void *pincb_arg)
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{
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gpg_error_t err;
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unsigned char *buffer;
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size_t buflen;
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void *relptr;
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assert (keyno >=0 && keyno <= 2);
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if (nbits > 4096)
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return gpg_error (GPG_ERR_TOO_LARGE);
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/* Read the current attributes into a buffer. */
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relptr = get_one_do (app, 0xC1+keyno, &buffer, &buflen, NULL);
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if (!relptr)
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return gpg_error (GPG_ERR_CARD);
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if (buflen < 6 || buffer[0] != PUBKEY_ALGO_RSA)
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{
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/* Attriutes too short or not an RSA key. */
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xfree (relptr);
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return gpg_error (GPG_ERR_CARD);
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}
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/* We only change n_bits and don't touch anything else. Before we
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do so, we round up NBITS to a sensible way in the same way as
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gpg's key generation does it. This may help to sort out problems
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with a few bits too short keys. */
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nbits = ((nbits + 31) / 32) * 32;
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buffer[1] = (nbits >> 8);
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buffer[2] = nbits;
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/* Prepare for storing the key. */
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err = verify_chv3 (app, pincb, pincb_arg);
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if (err)
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{
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xfree (relptr);
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return err;
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}
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return err;
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/* Change the attribute. */
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err = iso7816_put_data (app->slot, 0, 0xC1+keyno, buffer, buflen);
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xfree (relptr);
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err = iso7816_put_data (app->slot, 0, 0xC1+keyno, buf, buflen);
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if (err)
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log_error ("error changing size of key %d to %u bits\n", keyno+1, nbits);
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log_error ("error changing key attribute (key=%d)\n", keyno+1);
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else
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log_info ("size of key %d changed to %u bits\n", keyno+1, nbits);
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log_info ("key attribute changed (key=%d)\n", keyno+1);
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flush_cache (app);
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parse_algorithm_attribute (app, keyno);
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app->did_chv1 = 0;
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@ -2875,18 +2846,21 @@ change_keyattr (app_t app, int keyno, unsigned int nbits,
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}
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/* Helper to process an setattr command for name KEY-ATTR. It expects
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a string "--force <keyno> <algo> <nbits>" in (VALUE,VALUELEN). */
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/* Helper to process an setattr command for name KEY-ATTR.
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In (VALUE,VALUELEN), it expects following string:
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RSA: "--force <keyno> <algo> <nbits>"
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ECC: "--force <keyno> <algo> <curvename>"
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*/
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static gpg_error_t
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change_keyattr_from_string (app_t app,
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gpg_error_t (*pincb)(void*, const char *, char **),
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void *pincb_arg,
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const void *value, size_t valuelen)
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{
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gpg_error_t err;
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gpg_error_t err = 0;
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char *string;
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int keyno, algo;
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unsigned int nbits;
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int n = 0;
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/* VALUE is expected to be a string but not guaranteed to be
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terminated. Thus copy it to an allocated buffer first. */
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@ -2899,17 +2873,91 @@ change_keyattr_from_string (app_t app,
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/* Because this function deletes the key we require the string
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"--force" in the data to make clear that something serious might
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happen. */
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if (sscanf (string, " --force %d %d %u", &keyno, &algo, &nbits) != 3)
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err = gpg_error (GPG_ERR_INV_DATA);
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else if (keyno < 1 || keyno > 3)
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err = gpg_error (GPG_ERR_INV_ID);
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else if (algo != PUBKEY_ALGO_RSA)
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err = gpg_error (GPG_ERR_PUBKEY_ALGO);
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else if (nbits < 1024)
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err = gpg_error (GPG_ERR_TOO_SHORT);
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else
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err = change_keyattr (app, keyno-1, nbits, pincb, pincb_arg);
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sscanf (string, " --force %d %d %n", &keyno, &algo, &n);
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if (n < 13)
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{
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err = gpg_error (GPG_ERR_INV_DATA);
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goto leave;
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}
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if (keyno < 1 || keyno > 3)
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err = gpg_error (GPG_ERR_INV_ID);
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else if (algo == PUBKEY_ALGO_RSA)
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{
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unsigned int nbits;
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errno = 0;
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nbits = strtoul (string+n, NULL, 10);
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if (errno)
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err = gpg_error (GPG_ERR_INV_DATA);
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else if (nbits < 1024)
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err = gpg_error (GPG_ERR_TOO_SHORT);
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else if (nbits > 4096)
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err = gpg_error (GPG_ERR_TOO_LARGE);
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else
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{
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unsigned char *buf;
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size_t buflen;
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void *relptr;
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/* Read the current attributes into a buffer. */
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relptr = get_one_do (app, 0xC1+keyno, &buf, &buflen, NULL);
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if (!relptr)
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{
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err = gpg_error (GPG_ERR_CARD);
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goto leave;
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}
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if (buflen < 6 || buf[0] != PUBKEY_ALGO_RSA)
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{
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/* Attriutes too short or not an RSA key. */
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xfree (relptr);
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err = gpg_error (GPG_ERR_CARD);
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goto leave;
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}
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/* We only change n_bits and don't touch anything else. Before we
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do so, we round up NBITS to a sensible way in the same way as
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gpg's key generation does it. This may help to sort out problems
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with a few bits too short keys. */
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nbits = ((nbits + 31) / 32) * 32;
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buf[1] = (nbits >> 8);
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buf[2] = nbits;
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err = change_keyattr (app, keyno-1, buf, buflen, pincb, pincb_arg);
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xfree (relptr);
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}
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}
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else if (algo == PUBKEY_ALGO_ECDH || algo == PUBKEY_ALGO_ECDSA
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|| algo == PUBKEY_ALGO_EDDSA)
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{
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const char *oidstr;
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oidstr = openpgp_curve_to_oid (string+n, NULL);
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if (!oidstr)
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err = gpg_error (GPG_ERR_INV_DATA);
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else
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{
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gcry_mpi_t m;
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err = openpgp_oid_from_str (oidstr, &m);
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if (!err)
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{
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unsigned int len;
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const unsigned char *buf = gcry_mpi_get_opaque (m, &len);
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/* We have enough room at STRING. */
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len = buf[0];
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string[0] = algo;
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memcpy (string+1, buf+1, len++);
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err = change_keyattr (app, keyno-1, string, len,
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pincb, pincb_arg);
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gcry_mpi_release (m);
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}
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}
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}
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else
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err = gpg_error (GPG_ERR_PUBKEY_ALGO);
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leave:
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xfree (string);
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return err;
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}
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@ -3032,14 +3080,6 @@ rsa_writekey (app_t app, gpg_error_t (*pincb)(void*, const char *, char **),
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if (opt.verbose)
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log_info ("RSA modulus size is %u bits (%u bytes)\n",
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nbits, (unsigned int)rsa_n_len);
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if (nbits && nbits != maxbits
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&& app->app_local->extcap.algo_attr_change)
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{
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/* Try to switch the key to a new length. */
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err = change_keyattr (app, keyno, nbits, pincb, pincb_arg);
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if (!err)
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maxbits = app->app_local->keyattr[keyno].rsa.n_bits;
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}
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if (nbits != maxbits)
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{
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log_error (_("RSA modulus missing or not of size %d bits\n"),
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