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scd: support ECDSA public key.
* scd/app-openpgp.c (key_type_t): New. (CURVE_NIST_P256, CURVE_NIST_P384, CURVE_NIST_P521): New. (struct app_local_s): Change keyattr to have key_type and union. (get_ecc_key_parameters, get_curve_name): New. (send_key_attr, get_public_key): Support ECDSA. (build_privkey_template, do_writekey, do_genkey): Follow the change of the member KEY_ATTR. (parse_historical): New. (parse_algorithm_attribute): Support ECDSA. -- Add ECDSA support to OpenPGP card.
This commit is contained in:
NIIBE Yutaka
parent
5132ea8a0d
commit
010bc7f4f0
@ -116,6 +116,16 @@ static struct {
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};
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/* Type of keys. */
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typedef enum
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{
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KEY_TYPE_ECDH,
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KEY_TYPE_ECDSA,
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KEY_TYPE_RSA,
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}
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key_type_t;
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/* The format of RSA private keys. */
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typedef enum
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{
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@ -128,6 +138,15 @@ typedef enum
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rsa_key_format_t;
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/* Elliptic Curves. */
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enum
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{
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CURVE_NIST_P256,
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CURVE_NIST_P384,
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CURVE_NIST_P521
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};
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/* One cache item for DOs. */
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struct cache_s {
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struct cache_s *next;
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@ -199,15 +218,27 @@ struct app_local_s {
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int fixedlen_admin;
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} pinpad;
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struct
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{
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unsigned int n_bits; /* Size of the modulus in bits. The rest
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of this strucuire is only valid if
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this is not 0. */
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unsigned int e_bits; /* Size of the public exponent in bits. */
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rsa_key_format_t format;
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} keyattr[3];
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struct
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{
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key_type_t key_type;
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union {
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struct {
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unsigned int n_bits; /* Size of the modulus in bits. The rest
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of this strucuire is only valid if
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this is not 0. */
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unsigned int e_bits; /* Size of the public exponent in bits. */
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rsa_key_format_t format;
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} rsa;
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struct {
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int curve;
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} ecdsa;
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struct {
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int curve;
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int hashalgo;
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int cipheralgo;
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} ecdh;
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};
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} keyattr[3];
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};
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@ -844,19 +875,60 @@ send_key_data (ctrl_t ctrl, const char *name,
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}
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static void
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get_ecc_key_parameters (int curve, int *r_n_bits, const char **r_curve_oid)
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{
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if (curve == CURVE_NIST_P256)
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{
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*r_n_bits = 256;
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*r_curve_oid = "1.2.840.10045.3.1.7";
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}
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else if (curve == CURVE_NIST_P384)
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{
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*r_n_bits = 384;
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*r_curve_oid = "1.3.132.0.34";
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}
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else
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{
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*r_n_bits = 521;
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*r_curve_oid = "1.3.132.0.35";
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}
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}
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static void
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send_key_attr (ctrl_t ctrl, app_t app, const char *keyword, int number)
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{
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char buffer[200];
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int n_bits;
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const char *curve_oid;
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assert (number >=0 && number < DIM(app->app_local->keyattr));
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/* We only support RSA thus the algo identifier is fixed to 1. */
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snprintf (buffer, sizeof buffer, "%d 1 %u %u %d",
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number+1,
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app->app_local->keyattr[number].n_bits,
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app->app_local->keyattr[number].e_bits,
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app->app_local->keyattr[number].format);
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if (app->app_local->keyattr[number].key_type == KEY_TYPE_RSA)
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snprintf (buffer, sizeof buffer, "%d 1 %u %u %d",
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number+1,
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app->app_local->keyattr[number].rsa.n_bits,
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app->app_local->keyattr[number].rsa.e_bits,
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app->app_local->keyattr[number].rsa.format);
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else if (app->app_local->keyattr[number].key_type == KEY_TYPE_ECDSA)
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{
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get_ecc_key_parameters (app->app_local->keyattr[number].ecdsa.curve,
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&n_bits, &curve_oid);
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snprintf (buffer, sizeof buffer, "%d 19 %u %s",
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number+1, n_bits, curve_oid);
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}
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else if (app->app_local->keyattr[number].key_type == KEY_TYPE_ECDH)
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{
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get_ecc_key_parameters (app->app_local->keyattr[number].ecdh.curve,
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&n_bits, &curve_oid);
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snprintf (buffer, sizeof buffer, "%d 18 %u %s %d %d",
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number+1, n_bits, curve_oid,
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app->app_local->keyattr[number].ecdh.hashalgo,
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app->app_local->keyattr[number].ecdh.cipheralgo);
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}
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else
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snprintf (buffer, sizeof buffer, "0 0 UNKNOWN");
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send_status_direct (ctrl, keyword, buffer);
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}
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@ -1154,6 +1226,18 @@ retrieve_key_material (FILE *fp, const char *hexkeyid,
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#endif /*GNUPG_MAJOR_VERSION > 1*/
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static const char *
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get_curve_name (int curve)
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{
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if (curve == CURVE_NIST_P256)
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return "NIST P-256";
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else if (curve == CURVE_NIST_P384)
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return "NIST P-384";
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else
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return "NIST P-521";
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}
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/* Get the public key for KEYNO and store it as an S-expresion with
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the APP handle. On error that field gets cleared. If we already
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know about the public key we will just return. Note that this does
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@ -1171,11 +1255,14 @@ get_public_key (app_t app, int keyno)
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gpg_error_t err = 0;
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unsigned char *buffer;
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const unsigned char *keydata, *m, *e;
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size_t buflen, keydatalen, mlen, elen;
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size_t buflen, keydatalen;
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size_t mlen = 0;
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size_t elen = 0;
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unsigned char *mbuf = NULL;
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unsigned char *ebuf = NULL;
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char *keybuf = NULL;
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char *keybuf_p;
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gcry_sexp_t s_pkey;
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size_t len;
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if (keyno < 1 || keyno > 3)
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return gpg_error (GPG_ERR_INV_ID);
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@ -1227,51 +1314,34 @@ get_public_key (app_t app, int keyno)
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goto leave;
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}
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m = find_tlv (keydata, keydatalen, 0x0081, &mlen);
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if (!m)
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if (app->app_local->keyattr[keyno].key_type == KEY_TYPE_RSA)
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{
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err = gpg_error (GPG_ERR_CARD);
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log_error (_("response does not contain the RSA modulus\n"));
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goto leave;
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}
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e = find_tlv (keydata, keydatalen, 0x0082, &elen);
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if (!e)
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{
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err = gpg_error (GPG_ERR_CARD);
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log_error (_("response does not contain the RSA public exponent\n"));
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goto leave;
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}
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/* Prepend numbers with a 0 if needed. */
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if (mlen && (*m & 0x80))
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{
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mbuf = xtrymalloc ( mlen + 1);
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if (!mbuf)
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m = find_tlv (keydata, keydatalen, 0x0081, &mlen);
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if (!m)
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{
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err = gpg_error_from_syserror ();
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err = gpg_error (GPG_ERR_CARD);
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log_error (_("response does not contain the RSA modulus\n"));
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goto leave;
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}
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*mbuf = 0;
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memcpy (mbuf+1, m, mlen);
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mlen++;
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m = mbuf;
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}
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if (elen && (*e & 0x80))
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{
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ebuf = xtrymalloc ( elen + 1);
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if (!ebuf)
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e = find_tlv (keydata, keydatalen, 0x0082, &elen);
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if (!e)
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{
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err = gpg_error_from_syserror ();
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err = gpg_error (GPG_ERR_CARD);
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log_error (_("response does not contain the RSA public exponent\n"));
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goto leave;
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}
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}
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else
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{
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m = find_tlv (keydata, keydatalen, 0x0086, &mlen);
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if (!m)
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{
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err = gpg_error (GPG_ERR_CARD);
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log_error (_("response does not contain the EC public point\n"));
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goto leave;
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}
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*ebuf = 0;
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memcpy (ebuf+1, e, elen);
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elen++;
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e = ebuf;
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}
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}
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else
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{
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@ -1328,29 +1398,88 @@ get_public_key (app_t app, int keyno)
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}
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}
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/* Allocate a buffer to construct the S-expression. */
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/* FIXME: We should provide a generalized S-expression creation
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mechanism. */
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keybuf = xtrymalloc (50 + 2*35 + mlen + elen + 1);
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if (!keybuf)
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mbuf = xtrymalloc ( mlen + 1);
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if (!mbuf)
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{
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err = gpg_error_from_syserror ();
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goto leave;
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}
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/* Prepend numbers with a 0 if needed. */
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if (mlen && (*m & 0x80))
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{
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*mbuf = 0;
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memcpy (mbuf+1, m, mlen);
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mlen++;
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}
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else
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memcpy (mbuf, m, mlen);
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sprintf (keybuf, "(10:public-key(3:rsa(1:n%u:", (unsigned int) mlen);
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keybuf_p = keybuf + strlen (keybuf);
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memcpy (keybuf_p, m, mlen);
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keybuf_p += mlen;
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sprintf (keybuf_p, ")(1:e%u:", (unsigned int)elen);
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keybuf_p += strlen (keybuf_p);
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memcpy (keybuf_p, e, elen);
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keybuf_p += elen;
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strcpy (keybuf_p, ")))");
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keybuf_p += strlen (keybuf_p);
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ebuf = xtrymalloc ( elen + 1);
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if (!ebuf)
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{
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err = gpg_error_from_syserror ();
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goto leave;
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}
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/* Prepend numbers with a 0 if needed. */
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if (elen && (*e & 0x80))
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{
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*ebuf = 0;
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memcpy (ebuf+1, e, elen);
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elen++;
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}
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else
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memcpy (ebuf, e, elen);
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if (app->app_local->keyattr[keyno].key_type == KEY_TYPE_RSA)
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{
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err = gcry_sexp_build (&s_pkey, NULL, "(public-key(rsa(n%b)(e%b)))",
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mlen, mbuf, elen, ebuf);
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if (err)
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goto leave;
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len = gcry_sexp_sprint (s_pkey, GCRYSEXP_FMT_CANON, NULL, 0);
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keybuf = xtrymalloc (len);
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if (!keybuf)
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{
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gcry_sexp_release (s_pkey);
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err = gpg_error_from_syserror ();
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goto leave;
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}
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gcry_sexp_sprint (s_pkey, GCRYSEXP_FMT_CANON, keybuf, len);
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gcry_sexp_release (s_pkey);
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}
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else if (app->app_local->keyattr[keyno].key_type == KEY_TYPE_ECDSA)
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{
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const char *curve_name
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= get_curve_name (app->app_local->keyattr[keyno].ecdsa.curve);
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err = gcry_sexp_build (&s_pkey, NULL,
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"(public-key(ecdsa(curve%s)(q%b)))",
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curve_name, mlen, mbuf);
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if (err)
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goto leave;
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len = gcry_sexp_sprint (s_pkey, GCRYSEXP_FMT_CANON, NULL, 0);
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keybuf = xtrymalloc (len);
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if (!keybuf)
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{
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gcry_sexp_release (s_pkey);
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err = gpg_error_from_syserror ();
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goto leave;
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}
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gcry_sexp_sprint (s_pkey, GCRYSEXP_FMT_CANON, keybuf, len);
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gcry_sexp_release (s_pkey);
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}
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else
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{
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err = gpg_error (GPG_ERR_NOT_IMPLEMENTED);
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goto leave;
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}
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app->app_local->pk[keyno].key = (unsigned char*)keybuf;
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app->app_local->pk[keyno].keylen = (keybuf_p - keybuf);
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app->app_local->pk[keyno].keylen = len - 1; /* Decrement for trailing '\0' */
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leave:
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/* Set a flag to indicate that we tried to read the key. */
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@ -2395,7 +2524,7 @@ build_privkey_template (app_t app, int keyno,
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*result = NULL;
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*resultlen = 0;
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switch (app->app_local->keyattr[keyno].format)
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switch (app->app_local->keyattr[keyno].rsa.format)
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{
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case RSA_STD:
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case RSA_STD_N:
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@ -2409,7 +2538,7 @@ build_privkey_template (app_t app, int keyno,
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}
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/* Get the required length for E. */
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rsa_e_reqlen = app->app_local->keyattr[keyno].e_bits/8;
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rsa_e_reqlen = app->app_local->keyattr[keyno].rsa.e_bits/8;
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assert (rsa_e_len <= rsa_e_reqlen);
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/* Build the 7f48 cardholder private key template. */
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@ -2425,8 +2554,8 @@ build_privkey_template (app_t app, int keyno,
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tp += add_tlv (tp, 0x93, rsa_q_len);
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datalen += rsa_q_len;
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if (app->app_local->keyattr[keyno].format == RSA_STD_N
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|| app->app_local->keyattr[keyno].format == RSA_CRT_N)
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if (app->app_local->keyattr[keyno].rsa.format == RSA_STD_N
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|| app->app_local->keyattr[keyno].rsa.format == RSA_CRT_N)
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{
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tp += add_tlv (tp, 0x97, rsa_n_len);
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datalen += rsa_n_len;
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@ -2478,8 +2607,8 @@ build_privkey_template (app_t app, int keyno,
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memcpy (tp, rsa_q, rsa_q_len);
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tp += rsa_q_len;
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if (app->app_local->keyattr[keyno].format == RSA_STD_N
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|| app->app_local->keyattr[keyno].format == RSA_CRT_N)
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if (app->app_local->keyattr[keyno].rsa.format == RSA_STD_N
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|| app->app_local->keyattr[keyno].rsa.format == RSA_CRT_N)
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{
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memcpy (tp, rsa_n, rsa_n_len);
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tp += rsa_n_len;
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@ -2764,7 +2893,7 @@ do_writekey (app_t app, ctrl_t ctrl,
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goto leave;
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}
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maxbits = app->app_local->keyattr[keyno].n_bits;
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maxbits = app->app_local->keyattr[keyno].rsa.n_bits;
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nbits = rsa_n? count_bits (rsa_n, rsa_n_len) : 0;
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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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@ -2775,7 +2904,7 @@ do_writekey (app_t app, ctrl_t ctrl,
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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].n_bits;
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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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@ -2785,7 +2914,7 @@ do_writekey (app_t app, ctrl_t ctrl,
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goto leave;
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}
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maxbits = app->app_local->keyattr[keyno].e_bits;
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maxbits = app->app_local->keyattr[keyno].rsa.e_bits;
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if (maxbits > 32 && !app->app_local->extcap.is_v2)
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maxbits = 32; /* Our code for v1 does only support 32 bits. */
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nbits = rsa_e? count_bits (rsa_e, rsa_e_len) : 0;
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@ -2797,7 +2926,7 @@ do_writekey (app_t app, ctrl_t ctrl,
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goto leave;
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}
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maxbits = app->app_local->keyattr[keyno].n_bits/2;
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maxbits = app->app_local->keyattr[keyno].rsa.n_bits/2;
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nbits = rsa_p? count_bits (rsa_p, rsa_p_len) : 0;
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if (nbits != maxbits)
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{
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@ -2966,7 +3095,7 @@ do_genkey (app_t app, ctrl_t ctrl, const char *keynostr, unsigned int flags,
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to put a limit on the max. allowed keysize. 2048 bit will
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already lead to a 527 byte long status line and thus a 4096 bit
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key would exceed the Assuan line length limit. */
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keybits = app->app_local->keyattr[keyno].n_bits;
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keybits = app->app_local->keyattr[keyno].rsa.n_bits;
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if (keybits > 4096)
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return gpg_error (GPG_ERR_TOO_LARGE);
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@ -3753,6 +3882,22 @@ parse_historical (struct app_local_s *apploc,
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||||
}
|
||||
|
||||
|
||||
static int
|
||||
parse_ecc_curve (const unsigned char *buffer, size_t buflen)
|
||||
{
|
||||
int curve;
|
||||
|
||||
if (buflen == 6 && buffer[5] == 0x22)
|
||||
curve = CURVE_NIST_P384;
|
||||
else if (buflen == 6 && buffer[5] == 0x23)
|
||||
curve = CURVE_NIST_P521;
|
||||
else
|
||||
curve = CURVE_NIST_P256;
|
||||
|
||||
return curve;
|
||||
}
|
||||
|
||||
|
||||
/* Parse and optionally show the algorithm attributes for KEYNO.
|
||||
KEYNO must be in the range 0..2. */
|
||||
static void
|
||||
@ -3765,7 +3910,8 @@ parse_algorithm_attribute (app_t app, int keyno)
|
||||
|
||||
assert (keyno >=0 && keyno <= 2);
|
||||
|
||||
app->app_local->keyattr[keyno].n_bits = 0;
|
||||
app->app_local->keyattr[keyno].key_type = KEY_TYPE_RSA;
|
||||
app->app_local->keyattr[keyno].rsa.n_bits = 0;
|
||||
|
||||
relptr = get_one_do (app, 0xC1+keyno, &buffer, &buflen, NULL);
|
||||
if (!relptr)
|
||||
@ -3784,27 +3930,41 @@ parse_algorithm_attribute (app_t app, int keyno)
|
||||
log_info ("Key-Attr-%s ..: ", desc[keyno]);
|
||||
if (*buffer == 1 && (buflen == 5 || buflen == 6))
|
||||
{
|
||||
app->app_local->keyattr[keyno].n_bits = (buffer[1]<<8 | buffer[2]);
|
||||
app->app_local->keyattr[keyno].e_bits = (buffer[3]<<8 | buffer[4]);
|
||||
app->app_local->keyattr[keyno].format = 0;
|
||||
app->app_local->keyattr[keyno].rsa.n_bits = (buffer[1]<<8 | buffer[2]);
|
||||
app->app_local->keyattr[keyno].rsa.e_bits = (buffer[3]<<8 | buffer[4]);
|
||||
app->app_local->keyattr[keyno].rsa.format = 0;
|
||||
if (buflen < 6)
|
||||
app->app_local->keyattr[keyno].format = RSA_STD;
|
||||
app->app_local->keyattr[keyno].rsa.format = RSA_STD;
|
||||
else
|
||||
app->app_local->keyattr[keyno].format = (buffer[5] == 0? RSA_STD :
|
||||
buffer[5] == 1? RSA_STD_N :
|
||||
buffer[5] == 2? RSA_CRT :
|
||||
buffer[5] == 3? RSA_CRT_N :
|
||||
RSA_UNKNOWN_FMT);
|
||||
app->app_local->keyattr[keyno].rsa.format = (buffer[5] == 0? RSA_STD :
|
||||
buffer[5] == 1? RSA_STD_N :
|
||||
buffer[5] == 2? RSA_CRT :
|
||||
buffer[5] == 3? RSA_CRT_N :
|
||||
RSA_UNKNOWN_FMT);
|
||||
|
||||
if (opt.verbose)
|
||||
log_printf
|
||||
("RSA, n=%u, e=%u, fmt=%s\n",
|
||||
app->app_local->keyattr[keyno].n_bits,
|
||||
app->app_local->keyattr[keyno].e_bits,
|
||||
app->app_local->keyattr[keyno].format == RSA_STD? "std" :
|
||||
app->app_local->keyattr[keyno].format == RSA_STD_N?"std+n":
|
||||
app->app_local->keyattr[keyno].format == RSA_CRT? "crt" :
|
||||
app->app_local->keyattr[keyno].format == RSA_CRT_N?"crt+n":"?");
|
||||
app->app_local->keyattr[keyno].rsa.n_bits,
|
||||
app->app_local->keyattr[keyno].rsa.e_bits,
|
||||
app->app_local->keyattr[keyno].rsa.format == RSA_STD? "std" :
|
||||
app->app_local->keyattr[keyno].rsa.format == RSA_STD_N?"std+n":
|
||||
app->app_local->keyattr[keyno].rsa.format == RSA_CRT? "crt" :
|
||||
app->app_local->keyattr[keyno].rsa.format == RSA_CRT_N?"crt+n":"?");
|
||||
}
|
||||
else if (*buffer == 19) /* ECDSA */
|
||||
{
|
||||
app->app_local->keyattr[keyno].key_type = KEY_TYPE_ECDSA;
|
||||
app->app_local->keyattr[keyno].ecdsa.curve
|
||||
= parse_ecc_curve (buffer + 1, buflen - 1);
|
||||
}
|
||||
else if (*buffer == 18 && buflen == 11) /* ECDH */
|
||||
{
|
||||
app->app_local->keyattr[keyno].key_type = KEY_TYPE_ECDH;
|
||||
app->app_local->keyattr[keyno].ecdh.curve
|
||||
= parse_ecc_curve (buffer + 1, buflen - 1);
|
||||
app->app_local->keyattr[keyno].ecdh.hashalgo = buffer[1];
|
||||
app->app_local->keyattr[keyno].ecdh.cipheralgo = buffer[2];
|
||||
}
|
||||
else if (opt.verbose)
|
||||
log_printhex ("", buffer, buflen);
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user