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scd: Support OpenPGP card V3 for RSA.

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* scd/app-openpgp.c (struct app_local_s): Remove max_cmd_data and
max_rsp_data fields as Extended Capabilities bits are different.
(get_cached_data) Use extcap.max_certlen_3.
(get_one_do): Don't use exmode=1.
(determine_rsa_response): New.
(get_public_key, do_genkey): Call determine_rsa_response.
(do_sign): Use keyattr[0].rsa.n_bits / 8, instead of max_rsp_data.
(do_auth): Use keyattr[2].rsa.n_bits / 8, instead of max_rsp_data.
(do_decipher): Likewise with Use keyattr[1].rsa.n_bits / 8.
(show_caps): Remove max_cmd_data and max_rsp_data.
(app_select_openpgp): Likewise.

--
Backport of master commit: b89e63e5c326af71470124b410e6429cbd2b5c43

OpenPGP card V3 had introduced incompatible change in Extended
Capabilities bits.  We can work around by this change by not
using those bits.

Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
This commit is contained in:
NIIBE Yutaka 2016-11-25 16:12:26 +09:00
parent bb5a153f9d
commit 5c599e4f6e
1 changed files with 34 additions and 23 deletions
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57
scd/app-openpgp.c
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@ -182,8 +182,6 @@ struct app_local_s {
unsigned int sm_aes128:1; /* Use AES-128 for SM. */
unsigned int max_certlen_3:16;
unsigned int max_get_challenge:16; /* Maximum size for get_challenge. */
unsigned int max_cmd_data:16; /* Maximum data size for a command. */
unsigned int max_rsp_data:16; /* Maximum size of a response. */
} extcap;
/* Flags used to control the application. */
@ -300,7 +298,7 @@ get_cached_data (app_t app, int tag,
}
if (try_extlen && app->app_local->cardcap.ext_lc_le)
exmode = app->app_local->extcap.max_rsp_data;
exmode = app->app_local->extcap.max_certlen_3;
else
exmode = 0;
@ -430,10 +428,7 @@ get_one_do (app_t app, int tag, unsigned char **result, size_t *nbytes,
if (app->card_version > 0x0100 && data_objects[i].get_immediate_in_v11)
{
if (data_objects[i].try_extlen && app->app_local->cardcap.ext_lc_le)
exmode = app->app_local->extcap.max_rsp_data;
else
exmode = 0;
exmode = 0;
rc = iso7816_get_data (app->slot, exmode, tag, &buffer, &buflen);
if (rc)
{
@ -865,6 +860,22 @@ send_key_attr (ctrl_t ctrl, app_t app, const char *keyword, int number)
}
#define RSA_SMALL_SIZE_KEY 1952
#define RSA_SMALL_SIZE_OP 2048
static int
determine_rsa_response (app_t app, int keyno)
{
int size;
size = 2 + 3 /* header */
+ 4 /* tag+len */ + app->app_local->keyattr[keyno].n_bits/8
+ 2 /* tag+len */ + app->app_local->keyattr[keyno].e_bits/8;
return size;
}
/* Implement the GETATTR command. This is similar to the LEARN
command but returns just one value via the status interface. */
static gpg_error_t
@ -1199,10 +1210,11 @@ get_public_key (app_t app, int keyno)
int exmode, le_value;
/* We may simply read the public key out of these cards. */
if (app->app_local->cardcap.ext_lc_le)
if (app->app_local->cardcap.ext_lc_le
&& app->app_local->keyattr[keyno].n_bits > RSA_SMALL_SIZE_KEY)
{
exmode = 1; /* Use extended length. */
le_value = app->app_local->extcap.max_rsp_data;
le_value = determine_rsa_response (app, keyno);
}
else
{
@ -3042,12 +3054,11 @@ do_genkey (app_t app, ctrl_t ctrl, const char *keynostr, unsigned int flags,
if (err)
goto leave;
/* Test whether we will need extended length mode. (1900 is an
arbitrary length which for sure fits into a short apdu.) */
if (app->app_local->cardcap.ext_lc_le && keybits > 1900)
/* Test whether we will need extended length mode. */
if (app->app_local->cardcap.ext_lc_le && keybits > RSA_SMALL_SIZE_KEY)
{
exmode = 1; /* Use extended length w/o a limit. */
le_value = app->app_local->extcap.max_rsp_data;
le_value = determine_rsa_response (app, keyno);
/* No need to check le_value because it comes from a 16 bit
value and thus can't create an overflow on a 32 bit
system. */
@ -3406,10 +3417,11 @@ do_sign (app_t app, const char *keyidstr, int hashalgo,
}
if (app->app_local->cardcap.ext_lc_le)
if (app->app_local->cardcap.ext_lc_le
&& app->app_local->keyattr[0].n_bits > RSA_SMALL_SIZE_OP)
{
exmode = 1; /* Use extended length. */
le_value = app->app_local->extcap.max_rsp_data;
le_value = app->app_local->keyattr[0].n_bits / 8;
}
else
{
@ -3491,10 +3503,11 @@ do_auth (app_t app, const char *keyidstr,
{
int exmode, le_value;
if (app->app_local->cardcap.ext_lc_le)
if (app->app_local->cardcap.ext_lc_le
&& app->app_local->keyattr[2].n_bits > RSA_SMALL_SIZE_OP)
{
exmode = 1; /* Use extended length. */
le_value = app->app_local->extcap.max_rsp_data;
le_value = app->app_local->keyattr[2].n_bits / 8;
}
else
{
@ -3607,10 +3620,12 @@ do_decipher (app_t app, const char *keyidstr,
padind = -1; /* Already padded. */
}
if (app->app_local->cardcap.ext_lc_le && indatalen > 254 )
if (app->app_local->cardcap.ext_lc_le
&& (indatalen > 254
|| app->app_local->keyattr[1].n_bits > RSA_SMALL_SIZE_OP))
{
exmode = 1; /* Extended length w/o a limit. */
le_value = app->app_local->extcap.max_rsp_data;
le_value = app->app_local->keyattr[1].n_bits / 8;
}
else if (app->app_local->cardcap.cmd_chaining && indatalen > 254)
{
@ -3742,8 +3757,6 @@ show_caps (struct app_local_s *s)
if (s->extcap.sm_supported)
log_printf (" (%s)", s->extcap.sm_aes128? "AES-128":"3DES");
log_info ("Max-Cert3-Len ..: %u\n", s->extcap.max_certlen_3);
log_info ("Max-Cmd-Data ...: %u\n", s->extcap.max_cmd_data);
log_info ("Max-Rsp-Data ...: %u\n", s->extcap.max_rsp_data);
log_info ("Cmd-Chaining ...: %s\n", s->cardcap.cmd_chaining?"yes":"no");
log_info ("Ext-Lc-Le ......: %s\n", s->cardcap.ext_lc_le?"yes":"no");
log_info ("Status Indicator: %02X\n", s->status_indicator);
@ -3971,8 +3984,6 @@ app_select_openpgp (app_t app)
app->app_local->extcap.max_get_challenge
= (buffer[2] << 8 | buffer[3]);
app->app_local->extcap.max_certlen_3 = (buffer[4] << 8 | buffer[5]);
app->app_local->extcap.max_cmd_data = (buffer[6] << 8 | buffer[7]);
app->app_local->extcap.max_rsp_data = (buffer[8] << 8 | buffer[9]);
}
xfree (relptr);