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pico-hsm/openpgp-do.c
Pol Henarejos 0017284103
Starting migration from gnuk to own solution. 
gnuk/openpgp will be left as another pkcs15 app.
Lots of work has been done in the meanwhile.

Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
2022-02-13 01:17:14 +01:00

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/*
* openpgp-do.c -- OpenPGP card Data Objects (DO) handling
*
* Copyright (C) 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018,
* 2020, 2021
* Free Software Initiative of Japan1161
* Author: NIIBE Yutaka <gniibe@fsij.org>
*
* This file is a part of Gnuk, a GnuPG USB Token implementation.
*
* Gnuk is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Gnuk is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
* License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <stdint.h>
#include <string.h>
#include "config.h"
#include "sys.h"
#include "gnuk.h"
#include "status-code.h"
#include "random.h"
#include "common.h"
#include "mbedtls/aes.h"
#include "mbedtls/sha512.h"
#include "shake256.h"
#include "hsm2040.h"
/* Forward declaration */
#define CLEAN_PAGE_FULL 1
#define CLEAN_SINGLE 0
static void gpg_do_delete_prvkey (enum kind_of_key kk, int clean_page_full);
static void gpg_reset_digital_signature_counter (void);
#define PASSWORD_ERRORS_MAX 3 /* >= errors, it will be locked */
static const uint8_t *pw_err_counter_p[3];
static int
gpg_pw_get_err_counter (uint8_t which)
{
return flash_cnt123_get_value (pw_err_counter_p[which]);
}
int
gpg_pw_get_retry_counter (int who)
{
if (who == 0x81 || who == 0x82)
return PASSWORD_ERRORS_MAX - gpg_pw_get_err_counter (PW_ERR_PW1);
else if (who == 0x83)
return PASSWORD_ERRORS_MAX - gpg_pw_get_err_counter (PW_ERR_PW3);
else
return PASSWORD_ERRORS_MAX - gpg_pw_get_err_counter (PW_ERR_RC);
}
int
gpg_pw_locked (uint8_t which)
{
if (gpg_pw_get_err_counter (which) >= PASSWORD_ERRORS_MAX)
return 1;
else
return 0;
}
void
gpg_pw_reset_err_counter (uint8_t which)
{
flash_cnt123_clear (&pw_err_counter_p[which]);
if (pw_err_counter_p[which] != NULL)
GPG_MEMORY_FAILURE ();
}
void
gpg_pw_increment_err_counter (uint8_t which)
{
flash_cnt123_increment (which, &pw_err_counter_p[which]);
}
uint16_t data_objects_number_of_bytes;
/*
* Compile time vars:
* Historical Bytes, Extended Capabilities.
*/
/* Historical Bytes */
const uint8_t historical_bytes[] __attribute__ ((aligned (1))) = {
10,
0x00,
0x31, 0x84, /* Full DF name, GET DATA, MF */
0x73,
0x80, 0x01, 0x80, /* Full DF name */
/* 1-byte */
/* Command chaining, No extended Lc and Le */
#ifdef LIFE_CYCLE_MANAGEMENT_SUPPORT
0x05,
#else
0x00,
#endif
0x90, 0x00 /* Status info */
};
/* Extended Capabilities */
static const uint8_t extended_capabilities[] __attribute__ ((aligned (1))) = {
10,
0x75, /*
* No Secure Messaging supported
* GET CHALLENGE supported
* Key import supported
* PW status byte can be put
* No private_use_DO
* Algorithm attrs are changable
* No DEC with AES
* KDF-DO available
*/
0, /* Secure Messaging Algorithm: N/A (TDES=0, AES=1) */
0x00, CHALLENGE_LEN, /* Max size of GET CHALLENGE */
#ifdef CERTDO_SUPPORT
0x08, 0x00, /* max. length of cardholder certificate (2KiB) */
#else
0x00, 0x00,
#endif
/* Max. length of command APDU data */
0x00, 0xff,
/* Max. length of response APDU data */
0x01, 0x00,
};
#ifdef ACKBTN_SUPPORT
/* General Feature Management */
static const uint8_t feature_mngmnt[] __attribute__ ((aligned (1))) = {
3,
0x81, 0x01, 0x20,
};
#endif
/* Algorithm Attributes */
#define OPENPGP_ALGO_RSA 0x01
#define OPENPGP_ALGO_ECDH 0x12
#define OPENPGP_ALGO_ECDSA 0x13
#define OPENPGP_ALGO_EDDSA 0x16 /* It catches 22, finally. */
static const uint8_t algorithm_attr_ed448[] __attribute__ ((aligned (1))) = {
4,
OPENPGP_ALGO_EDDSA,
/* OID of Ed448 */
0x2b, 0x65, 0x71
};
static const uint8_t algorithm_attr_x448[] __attribute__ ((aligned (1))) = {
4,
OPENPGP_ALGO_ECDH,
/* OID of X448 */
0x2b, 0x65, 0x6f
};
static const uint8_t algorithm_attr_rsa2k[] __attribute__ ((aligned (1))) = {
6,
OPENPGP_ALGO_RSA,
0x08, 0x00, /* Length modulus (in bit): 2048 */
0x00, 0x20, /* Length exponent (in bit): 32 */
0x00 /* 0: Acceptable format is: P and Q */
};
static const uint8_t algorithm_attr_rsa4k[] __attribute__ ((aligned (1))) = {
6,
OPENPGP_ALGO_RSA,
0x10, 0x00, /* Length modulus (in bit): 4096 */
0x00, 0x20, /* Length exponent (in bit): 32 */
0x00 /* 0: Acceptable format is: P and Q */
};
static const uint8_t algorithm_attr_p256k1[] __attribute__ ((aligned (1))) = {
6,
OPENPGP_ALGO_ECDSA,
0x2b, 0x81, 0x04, 0x00, 0x0a /* OID of curve secp256k1 */
};
static const uint8_t algorithm_attr_ed25519[] __attribute__ ((aligned (1))) = {
10,
OPENPGP_ALGO_EDDSA,
/* OID of the curve Ed25519 */
0x2b, 0x06, 0x01, 0x04, 0x01, 0xda, 0x47, 0x0f, 0x01
};
static const uint8_t algorithm_attr_cv25519[] __attribute__ ((aligned (1))) = {
11,
OPENPGP_ALGO_ECDH,
/* OID of the curve Curve25519 */
0x2b, 0x06, 0x01, 0x04, 0x01, 0x97, 0x55, 0x01, 0x05, 0x01
};
/*
* Representation of PW1_LIFETIME:
* 0: PW1_LIEFTIME_P == NULL : PW1 is valid for single PSO:CDS command
* 1: PW1_LIEFTIME_P != NULL : PW1 is valid for several PSO:CDS commands
*
* The address in the variable PW1_LIEFTIME_P is used when filling zero
* in flash memory
*/
static const uint8_t *pw1_lifetime_p;
static int
gpg_get_pw1_lifetime (void)
{
if (pw1_lifetime_p == NULL)
return 0;
else
return 1;
}
/*
* Representation of algorithm attributes:
* 0: ALGO_ATTR_<>_P == NULL : RSA-2048
* N: ALGO_ATTR_<>_P != NULL :
*
*/
static const uint8_t *algo_attr_sig_p;
static const uint8_t *algo_attr_dec_p;
static const uint8_t *algo_attr_aut_p;
static const uint8_t **
get_algo_attr_pointer (enum kind_of_key kk)
{
if (kk == GPG_KEY_FOR_SIGNING)
return &algo_attr_sig_p;
else if (kk == GPG_KEY_FOR_DECRYPTION)
return &algo_attr_dec_p;
else
return &algo_attr_aut_p;
}
static int
kk_to_nr (enum kind_of_key kk)
{
int nr;
if (kk == GPG_KEY_FOR_SIGNING)
nr = NR_KEY_ALGO_ATTR_SIG;
else if (kk == GPG_KEY_FOR_DECRYPTION)
nr = NR_KEY_ALGO_ATTR_DEC;
else
nr = NR_KEY_ALGO_ATTR_AUT;
return nr;
}
int
gpg_get_algo_attr (enum kind_of_key kk)
{
const uint8_t *algo_attr_p = *get_algo_attr_pointer (kk);
if (algo_attr_p == NULL)
return ALGO_RSA2K;
return algo_attr_p[1];
}
static void
gpg_reset_algo_attr (enum kind_of_key kk)
{
gpg_do_delete_prvkey (kk, CLEAN_PAGE_FULL);
if (kk == GPG_KEY_FOR_SIGNING)
{
gpg_reset_digital_signature_counter ();
gpg_do_write_simple (NR_DO_FP_SIG, NULL, 0);
gpg_do_write_simple (NR_DO_KGTIME_SIG, NULL, 0);
}
else if (kk == GPG_KEY_FOR_DECRYPTION)
{
gpg_do_write_simple (NR_DO_FP_DEC, NULL, 0);
gpg_do_write_simple (NR_DO_KGTIME_DEC, NULL, 0);
}
else
{
gpg_do_write_simple (NR_DO_FP_AUT, NULL, 0);
gpg_do_write_simple (NR_DO_KGTIME_AUT, NULL, 0);
}
}
static const uint8_t *
get_algo_attr_data_object (enum kind_of_key kk)
{
const uint8_t *algo_attr_p = *get_algo_attr_pointer (kk);
if (algo_attr_p == NULL)
return algorithm_attr_rsa2k;
switch (algo_attr_p[1])
{
case ALGO_RSA4K:
return algorithm_attr_rsa4k;
case ALGO_SECP256K1:
return algorithm_attr_p256k1;
case ALGO_CURVE25519:
return algorithm_attr_cv25519;
case ALGO_ED25519:
return algorithm_attr_ed25519;
case ALGO_ED448:
return algorithm_attr_ed448;
case ALGO_X448:
return algorithm_attr_x448;
default:
return algorithm_attr_rsa2k;
}
}
int
gpg_get_algo_attr_key_size (enum kind_of_key kk, enum size_of_key s)
{
const uint8_t *algo_attr_p = *get_algo_attr_pointer (kk);
if (algo_attr_p == NULL) /* RSA-2048 */
goto rsa2k;
switch (algo_attr_p[1])
{
case ALGO_RSA4K:
if (s == GPG_KEY_STORAGE)
return 1024;
else
return 512;
case ALGO_SECP256K1:
if (s == GPG_KEY_STORAGE)
return 128;
else if (s == GPG_KEY_PUBLIC)
return 64;
else
return 32;
case ALGO_CURVE25519:
if (s == GPG_KEY_STORAGE)
return 64;
else
return 32;
case ALGO_ED25519:
if (s == GPG_KEY_STORAGE)
return 128;
else if (s == GPG_KEY_PUBLIC)
return 32;
else
return 64;
case ALGO_ED448:
if (s == GPG_KEY_STORAGE)
return 256;
else if (s == GPG_KEY_PUBLIC)
return 57;
else
return 128;
case ALGO_X448:
if (s == GPG_KEY_STORAGE)
return 112;
else
return 56;
default:
rsa2k:
if (s == GPG_KEY_STORAGE)
return 512;
else
return 256;
}
}
static uint32_t digital_signature_counter;
static const uint8_t *
gpg_write_digital_signature_counter (const uint8_t *p, uint32_t dsc)
{
uint16_t hw0, hw1;
if ((dsc >> 10) == 0)
{ /* no upper bits */
hw1 = NR_COUNTER_DS_LSB | ((dsc & 0x0300) >> 8) | ((dsc & 0x00ff) << 8);
flash_put_data_internal (p, hw1);
return p+2;
}
else
{
hw0 = NR_COUNTER_DS | ((dsc & 0xfc0000) >> 18) | ((dsc & 0x03fc00) >> 2);
hw1 = NR_COUNTER_DS_LSB | ((dsc & 0x0300) >> 8) | ((dsc & 0x00ff) << 8);
flash_put_data_internal (p, hw0);
flash_put_data_internal (p+2, hw1);
return p+4;
}
}
static void
gpg_reset_digital_signature_counter (void)
{
if (digital_signature_counter != 0)
{
flash_put_data (NR_COUNTER_DS);
flash_put_data (NR_COUNTER_DS_LSB);
digital_signature_counter = 0;
}
}
void
gpg_increment_digital_signature_counter (void)
{
uint16_t hw0, hw1;
uint32_t dsc = (digital_signature_counter + 1) & 0x00ffffff;
if ((dsc & 0x03ff) == 0)
{ /* carry occurs from l10 to h14 */
hw0 = NR_COUNTER_DS | ((dsc & 0xfc0000) >> 18) | ((dsc & 0x03fc00) >> 2);
hw1 = NR_COUNTER_DS_LSB; /* zero */
flash_put_data (hw0);
flash_put_data (hw1);
}
else
{
hw1 = NR_COUNTER_DS_LSB | ((dsc & 0x0300) >> 8) | ((dsc & 0x00ff) << 8);
flash_put_data (hw1);
}
digital_signature_counter = dsc;
if (gpg_get_pw1_lifetime () == 0)
ac_reset_pso_cds ();
}
#define SIZE_FINGER_PRINT 20
#define SIZE_KEYGEN_TIME 4 /* RFC4880 */
enum do_type {
DO_FIXED,
DO_VAR,
DO_CMP_READ,
DO_PROC_READ,
DO_PROC_WRITE,
DO_PROC_READWRITE,
};
struct do_table_entry {
uint16_t tag;
enum do_type do_type;
uint8_t ac_read;
uint8_t ac_write;
const void *obj;
};
static uint8_t *res_p;
static void copy_do_1 (uint16_t tag, const uint8_t *do_data, int with_tag);
static const struct do_table_entry *get_do_entry (uint16_t tag);
#define GPG_DO_AID 0x004f
#define GPG_DO_NAME 0x005b
#define GPG_DO_LOGIN_DATA 0x005e
#define GPG_DO_CH_DATA 0x0065
#define GPG_DO_APP_DATA 0x006e
#define GPG_DO_DISCRETIONARY 0x0073
#define GPG_DO_SS_TEMP 0x007a
#define GPG_DO_DS_COUNT 0x0093
#define GPG_DO_EXTCAP 0x00c0
#define GPG_DO_ALG_SIG 0x00c1
#define GPG_DO_ALG_DEC 0x00c2
#define GPG_DO_ALG_AUT 0x00c3
#define GPG_DO_PW_STATUS 0x00c4
#define GPG_DO_FP_ALL 0x00c5
#define GPG_DO_CAFP_ALL 0x00c6
#define GPG_DO_FP_SIG 0x00c7
#define GPG_DO_FP_DEC 0x00c8
#define GPG_DO_FP_AUT 0x00c9
#define GPG_DO_CAFP_1 0x00ca
#define GPG_DO_CAFP_2 0x00cb
#define GPG_DO_CAFP_3 0x00cc
#define GPG_DO_KGTIME_ALL 0x00cd
#define GPG_DO_KGTIME_SIG 0x00ce
#define GPG_DO_KGTIME_DEC 0x00cf
#define GPG_DO_KGTIME_AUT 0x00d0
#define GPG_DO_RESETTING_CODE 0x00d3
#define GPG_DO_UIF_SIG 0x00d6
#define GPG_DO_UIF_DEC 0x00d7
#define GPG_DO_UIF_AUT 0x00d8
#define GPG_DO_KDF 0x00f9
#define GPG_DO_ALG_INFO 0x00fa
#define GPG_DO_KEY_IMPORT 0x3fff
#define GPG_DO_LANGUAGE 0x5f2d
#define GPG_DO_SEX 0x5f35
#define GPG_DO_URL 0x5f50
#define GPG_DO_HIST_BYTES 0x5f52
#define GPG_DO_CH_CERTIFICATE 0x7f21
#define GPG_DO_FEATURE_MNGMNT 0x7f74
static const uint8_t *do_ptr[NR_DO__LAST__];
static int
do_tag_to_nr (uint16_t tag)
{
switch (tag)
{
case GPG_DO_SEX:
return NR_DO_SEX;
case GPG_DO_FP_SIG:
return NR_DO_FP_SIG;
case GPG_DO_FP_DEC:
return NR_DO_FP_DEC;
case GPG_DO_FP_AUT:
return NR_DO_FP_AUT;
case GPG_DO_CAFP_1:
return NR_DO_CAFP_1;
case GPG_DO_CAFP_2:
return NR_DO_CAFP_2;
case GPG_DO_CAFP_3:
return NR_DO_CAFP_3;
case GPG_DO_KGTIME_SIG:
return NR_DO_KGTIME_SIG;
case GPG_DO_KGTIME_DEC:
return NR_DO_KGTIME_DEC;
case GPG_DO_KGTIME_AUT:
return NR_DO_KGTIME_AUT;
case GPG_DO_LOGIN_DATA:
return NR_DO_LOGIN_DATA;
case GPG_DO_URL:
return NR_DO_URL;
case GPG_DO_NAME:
return NR_DO_NAME;
case GPG_DO_LANGUAGE:
return NR_DO_LANGUAGE;
case GPG_DO_KDF:
return NR_DO_KDF;
default:
return -1;
}
}
static void
copy_tag (uint16_t tag)
{
if (tag < 0x0100)
*res_p++ = (tag & 0xff);
else
{
*res_p++ = (tag >> 8);
*res_p++ = (tag & 0xff);
}
}
#define SIZE_FP 20
#define SIZE_KGTIME 4
static void
do_fp_all (uint16_t tag, int with_tag)
{
const uint8_t *data;
if (with_tag)
{
copy_tag (tag);
*res_p++ = SIZE_FP*3;
}
data = gpg_do_read_simple (NR_DO_FP_SIG);
if (data)
memcpy (res_p, data, SIZE_FP);
else
memset (res_p, 0, SIZE_FP);
res_p += SIZE_FP;
data = gpg_do_read_simple (NR_DO_FP_DEC);
if (data)
memcpy (res_p, data, SIZE_FP);
else
memset (res_p, 0, SIZE_FP);
res_p += SIZE_FP;
data = gpg_do_read_simple (NR_DO_FP_AUT);
if (data)
memcpy (res_p, data, SIZE_FP);
else
memset (res_p, 0, SIZE_FP);
res_p += SIZE_FP;
}
static void
do_cafp_all (uint16_t tag, int with_tag)
{
const uint8_t *data;
if (with_tag)
{
copy_tag (tag);
*res_p++ = SIZE_FP*3;
}
data = gpg_do_read_simple (NR_DO_CAFP_1);
if (data)
memcpy (res_p, data, SIZE_FP);
else
memset (res_p, 0, SIZE_FP);
res_p += SIZE_FP;
data = gpg_do_read_simple (NR_DO_CAFP_2);
if (data)
memcpy (res_p, data, SIZE_FP);
else
memset (res_p, 0, SIZE_FP);
res_p += SIZE_FP;
data = gpg_do_read_simple (NR_DO_CAFP_2);
if (data)
memcpy (res_p, data, SIZE_FP);
else
memset (res_p, 0, SIZE_FP);
res_p += SIZE_FP;
}
static void
do_kgtime_all (uint16_t tag, int with_tag)
{
const uint8_t *data;
if (with_tag)
{
copy_tag (tag);
*res_p++ = SIZE_KGTIME*3;
}
data = gpg_do_read_simple (NR_DO_KGTIME_SIG);
if (data)
memcpy (res_p, data, SIZE_KGTIME);
else
memset (res_p, 0, SIZE_KGTIME);
res_p += SIZE_KGTIME;
data = gpg_do_read_simple (NR_DO_KGTIME_DEC);
if (data)
memcpy (res_p, data, SIZE_KGTIME);
else
memset (res_p, 0, SIZE_KGTIME);
res_p += SIZE_KGTIME;
data = gpg_do_read_simple (NR_DO_KGTIME_AUT);
if (data)
memcpy (res_p, data, SIZE_KGTIME);
else
memset (res_p, 0, SIZE_KGTIME);
res_p += SIZE_KGTIME;
}
const uint8_t openpgpcard_aid[] = {
0xd2, 0x76, /* D: National, 276: DEU ISO 3166-1 */
0x00, 0x01, 0x24, /* Registered Application Provider Identifier */
0x01, /* Application: OpenPGPcard */
0x02, 0x00, /* Version 2.0 */
/* v. id */ /* serial number */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* To be overwritten */
};
static void
do_openpgpcard_aid (uint16_t tag, int with_tag)
{
const volatile uint8_t *p = openpgpcard_aid;
uint16_t vid = (p[8] << 8) | p[9];
if (with_tag)
{
copy_tag (tag);
*res_p++ = 16;
}
if (vid == 0xffff || vid == 0x0000)
{
const uint8_t *u = unique_device_id () + (MHZ < 96 ? 8: 0);
memcpy (res_p, openpgpcard_aid, 8);
res_p += 8;
/* vid == 0xfffe: serial number is four random bytes */
*res_p++ = 0xff;
*res_p++ = 0xfe;
*res_p++ = u[3];
*res_p++ = u[2];
*res_p++ = u[1];
*res_p++ = u[0];
}
else
{
memcpy (res_p, openpgpcard_aid, 14);
res_p += 14;
}
*res_p++ = 0;
*res_p++ = 0;
}
static void
do_ds_count (uint16_t tag, int with_tag)
{
if (with_tag)
{
copy_tag (tag);
*res_p++ = 3;
}
*res_p++ = (digital_signature_counter >> 16) & 0xff;
*res_p++ = (digital_signature_counter >> 8) & 0xff;
*res_p++ = digital_signature_counter & 0xff;
}
static void
do_alg_info (uint16_t tag, int with_tag)
{
uint8_t *len_p = NULL;
int i;
if (with_tag)
{
copy_tag (tag);
len_p = res_p;
*res_p++ = 0; /* Filled later, assuming length is <= 127 */
}
for (i = 0; i < 3; i++)
{
uint16_t tag_algo = GPG_DO_ALG_SIG + i;
copy_do_1 (tag_algo, algorithm_attr_rsa2k, 1);
copy_do_1 (tag_algo, algorithm_attr_rsa4k, 1);
copy_do_1 (tag_algo, algorithm_attr_p256k1, 1);
if (i == 0 || i == 2)
{
copy_do_1 (tag_algo, algorithm_attr_ed25519, 1);
copy_do_1 (tag_algo, algorithm_attr_ed448, 1);
}
if (i == 1)
{
copy_do_1 (tag_algo, algorithm_attr_cv25519, 1);
copy_do_1 (tag_algo, algorithm_attr_x448, 1);
}
};
if (len_p)
*len_p = res_p - len_p - 1; /* Actually, it's 127-byte long. */
}
static int
rw_pw_status (uint16_t tag, int with_tag,
const uint8_t *data, int len, int is_write)
{
if (is_write)
{
if (len != 1)
return 0; /* Failure */
/* The first byte of DATA specifies the lifetime. */
if (data[0] == 0 && pw1_lifetime_p != NULL)
{
flash_bool_clear (&pw1_lifetime_p);
if (pw1_lifetime_p != NULL) /* No change after update */
return 0;
}
else if (pw1_lifetime_p == NULL)
{
pw1_lifetime_p = flash_bool_write (NR_BOOL_PW1_LIFETIME);
if (pw1_lifetime_p == NULL) /* No change after update */
return 0;
}
return 1; /* Success */
}
else
{
if (with_tag)
{
copy_tag (tag);
*res_p++ = SIZE_PW_STATUS_BYTES;
}
*res_p++ = gpg_get_pw1_lifetime ();
*res_p++ = PW_LEN_MAX;
*res_p++ = PW_LEN_MAX;
*res_p++ = PW_LEN_MAX;
*res_p++ = PASSWORD_ERRORS_MAX - gpg_pw_get_err_counter (PW_ERR_PW1);
*res_p++ = PASSWORD_ERRORS_MAX - gpg_pw_get_err_counter (PW_ERR_RC);
*res_p++ = PASSWORD_ERRORS_MAX - gpg_pw_get_err_counter (PW_ERR_PW3);
return 1;
}
}
static int
rw_algorithm_attr (uint16_t tag, int with_tag,
const uint8_t *data, int len, int is_write)
{
enum kind_of_key kk;
if (tag == GPG_DO_ALG_SIG)
kk = GPG_KEY_FOR_SIGNING;
else if (tag == GPG_DO_ALG_DEC)
kk = GPG_KEY_FOR_DECRYPTION;
else
kk = GPG_KEY_FOR_AUTHENTICATION;
if (is_write)
{
int algo = -1;
const uint8_t **algo_attr_pp = get_algo_attr_pointer (kk);
if (len == 4)
{
if (memcmp (data, algorithm_attr_ed448+1, 4) == 0)
algo = ALGO_ED448;
else if (memcmp (data, algorithm_attr_x448+1, 4) == 0)
algo = ALGO_X448;
}
if (len == 6)
{
if (memcmp (data, algorithm_attr_rsa2k+1, 6) == 0)
algo = ALGO_RSA2K;
else if (memcmp (data, algorithm_attr_rsa4k+1, 6) == 0)
algo = ALGO_RSA4K;
else if ((tag != GPG_DO_ALG_DEC
&& memcmp (data, algorithm_attr_p256k1+1, 6) == 0)
|| (tag == GPG_DO_ALG_DEC && data[0]==OPENPGP_ALGO_ECDH
&& memcmp (data+1, algorithm_attr_p256k1+2, 5) == 0))
algo = ALGO_SECP256K1;
}
else if (len == 10 && memcmp (data, algorithm_attr_ed25519+1, 10) == 0)
algo = ALGO_ED25519;
else if (len == 11 && memcmp (data, algorithm_attr_cv25519+1, 11) == 0)
algo = ALGO_CURVE25519;
if (algo < 0)
return 0; /* Error. */
else if (algo == ALGO_RSA2K && *algo_attr_pp != NULL)
{
gpg_reset_algo_attr (kk);
/* Read it again, since GC may occur. */
algo_attr_pp = get_algo_attr_pointer (kk);
flash_enum_clear (algo_attr_pp);
if (*algo_attr_pp != NULL)
return 0;
}
else if ((algo != ALGO_RSA2K && *algo_attr_pp == NULL) ||
(*algo_attr_pp != NULL && (*algo_attr_pp)[1] != algo))
{
gpg_reset_algo_attr (kk);
/* Read it again, since GC may occur. */
algo_attr_pp = get_algo_attr_pointer (kk);
if (*algo_attr_pp)
flash_enum_clear (algo_attr_pp);
*algo_attr_pp = flash_enum_write (kk_to_nr (kk), algo);
if (*algo_attr_pp == NULL)
return 0;
}
return 1;
}
else
{
const uint8_t *algo_attr_do = get_algo_attr_data_object (kk);
copy_do_1 (tag, algo_attr_do, with_tag);
/* Override the byte when GPG_DO_ALG_DEC. */
if (tag == GPG_DO_ALG_DEC && algo_attr_do[1] == OPENPGP_ALGO_ECDSA)
*(res_p - algo_attr_do[0]) = OPENPGP_ALGO_ECDH;
return 1;
}
}
static uint8_t uif_flags; /* Six bits of flags */
#ifdef ACKBTN_SUPPORT
int
gpg_do_get_uif (enum kind_of_key kk)
{
return ((uif_flags >> (kk * 2)) & 3) != 0;
}
static int
rw_uif (uint16_t tag, int with_tag, const uint8_t *data, int len, int is_write)
{
uint8_t nr;
int v;
if (tag != GPG_DO_UIF_SIG && tag != GPG_DO_UIF_DEC && tag != GPG_DO_UIF_AUT)
return 0; /* Failure */
nr = (tag - GPG_DO_UIF_SIG) + NR_DO_UIF_SIG;
v = (uif_flags >> ((tag - GPG_DO_UIF_SIG) * 2)) & 3;
if (is_write)
{
const uint8_t *p;
if (len != 2 || data[1] != 0x20)
return 0;
if (v == 2)
return 0;
if (data[0] != 0x00 && data[0] != 0x01 && data[0] != 0x02)
return 0;
p = flash_enum_write (nr, data[0]);
if (p == NULL)
return 0;
uif_flags &= ~(3 << ((nr - NR_DO_UIF_SIG) * 2));
uif_flags |= (data[0] & 3) << ((nr - NR_DO_UIF_SIG) * 2);
return 1;
}
else
{
if (with_tag)
{
copy_tag (tag);
*res_p++ = 2;
}
*res_p++ = v;
*res_p++ = 0x20;
return 1;
}
}
#endif
#define SIZE_OF_KDF_DO_MIN 90
#define SIZE_OF_KDF_DO_MAX 110
#define OPENPGP_KDF_ITERSALTED_S2K 3
#define OPENPGP_SHA256 8
static int
rw_kdf (uint16_t tag, int with_tag, const uint8_t *data, int len, int is_write)
{
if (tag != GPG_DO_KDF)
return 0; /* Failure */
if (is_write)
{
const uint8_t **do_data_p = (const uint8_t **)&do_ptr[NR_DO_KDF];
/* KDF DO can be changed only when no keys are registered. */
if (do_ptr[NR_DO_PRVKEY_SIG] || do_ptr[NR_DO_PRVKEY_DEC]
|| do_ptr[NR_DO_PRVKEY_AUT])
return 0;
/* The valid data format is:
Deleting:
nothing
Minimum (for admin-less):
81 01 03 = KDF_ITERSALTED_S2K
82 01 08 = SHA256
83 04 4-byte... = count
84 08 8-byte... = salt
87 20 32-byte user hash
88 20 32-byte admin hash
Full:
81 01 03 = KDF_ITERSALTED_S2K
82 01 08 = SHA256
83 04 4-byte... = count
84 08 8-byte... = salt user
85 08 8-byte... = salt reset-code
86 08 8-byte... = salt admin
87 20 32-byte user hash
88 20 32-byte admin hash
*/
if (!(len == 0
|| (len == SIZE_OF_KDF_DO_MIN &&
(data[0] == 0x81 && data[3] == 0x82 && data[6] == 0x83
&& data[12] == 0x84 && data[22] == 0x87 && data[56] == 0x88))
|| (len == SIZE_OF_KDF_DO_MAX &&
(data[0] == 0x81 && data[3] == 0x82 && data[6] == 0x83
&& data[12] == 0x84 && data[22] == 0x85 && data[32] == 0x86
&& data[42] == 0x87 && data[76] == 0x88))))
return 0;
if (*do_data_p)
flash_do_release (*do_data_p);
/* Clear all keystrings and auth states */
gpg_do_write_simple (NR_DO_KEYSTRING_PW1, NULL, 0);
gpg_do_write_simple (NR_DO_KEYSTRING_RC, NULL, 0);
gpg_do_write_simple (NR_DO_KEYSTRING_PW3, NULL, 0);
ac_reset_admin ();
ac_reset_pso_cds ();
ac_reset_other ();
if (len == 0)
{
*do_data_p = NULL;
return 1;
}
else
{
*do_data_p = flash_do_write (NR_DO_KDF, data, len);
if (*do_data_p)
return 1;
else
return 0;
}
}
else
{
if (do_ptr[NR_DO_KDF])
copy_do_1 (tag, do_ptr[NR_DO_KDF], with_tag);
else
return 0;
return 1;
}
}
/*
* Check LEN is valid for HOW_MANY of passphrase string.
*
* HOW_MANY = 1: LEN is valid for a single passphrase string.
* HOW_MANY = 2: LEN is valid for two single passphrase strings.
* This is used to change passphrase.
* The second passphrase may be nothing.
*
* LEN = 0: Check if KDF-DO is available.
*/
int
gpg_do_kdf_check (int len, int how_many)
{
const uint8_t *kdf_do = do_ptr[NR_DO_KDF];
if (len == 0)
return kdf_do != NULL;
if (kdf_do)
{
const uint8_t *kdf_spec = kdf_do+1;
int kdf_do_len = kdf_do[0];
int hash_len;
if (kdf_do_len == SIZE_OF_KDF_DO_MIN)
hash_len = kdf_spec[23];
else
hash_len = kdf_spec[43];
if ((hash_len * how_many) != len && hash_len != len)
return 0;
}
return 1;
}
void
gpg_do_get_initial_pw_setting (int is_pw3, int *r_len, const uint8_t **r_p)
{
const uint8_t *kdf_do = do_ptr[NR_DO_KDF];
if (kdf_do)
{
int len = kdf_do[0];
const uint8_t *kdf_spec = kdf_do+1;
*r_len = 32;
if (len == SIZE_OF_KDF_DO_MIN)
{
if (is_pw3)
*r_p = kdf_spec + 58;
else
*r_p = kdf_spec + 24;
}
else
{
if (is_pw3)
*r_p = kdf_spec + 78;
else
*r_p = kdf_spec + 44;
}
}
else
{
if (is_pw3)
{
*r_len = strlen (OPENPGP_CARD_INITIAL_PW3);
*r_p = (const uint8_t *)OPENPGP_CARD_INITIAL_PW3;
}
else
{
*r_len = strlen (OPENPGP_CARD_INITIAL_PW1);
*r_p = (const uint8_t *)OPENPGP_CARD_INITIAL_PW1;
}
}
}
static int
proc_resetting_code (const uint8_t *data, int len)
{
const uint8_t *old_ks = keystring_md_pw3;
uint8_t new_ks0[KEYSTRING_SIZE];
uint8_t *new_ks = KS_GET_KEYSTRING (new_ks0);
const uint8_t *newpw;
int newpw_len;
int r;
uint8_t *salt = KS_GET_SALT (new_ks0);
DEBUG_INFO ("Resetting Code!\r\n");
if (len == 0)
{ /* Removal of resetting code. */
enum kind_of_key kk0;
for (kk0 = 0; kk0 <= GPG_KEY_FOR_AUTHENTICATION; kk0++)
gpg_do_chks_prvkey (kk0, BY_RESETCODE, NULL, 0, NULL);
gpg_do_write_simple (NR_DO_KEYSTRING_RC, NULL, 0);
}
else
{
if (gpg_do_kdf_check (len, 1) == 0)
return 0;
newpw_len = len;
newpw = data;
new_ks0[0] = newpw_len;
random_get_salt (salt);
s2k (salt, SALT_SIZE, newpw, newpw_len, new_ks);
r = gpg_change_keystring (admin_authorized, old_ks, BY_RESETCODE, new_ks);
if (r <= -2)
{
DEBUG_INFO ("memory error.\r\n");
return 0;
}
else if (r < 0)
{
DEBUG_INFO ("security error.\r\n");
return 0;
}
else if (r == 0)
{
DEBUG_INFO ("error (no prvkey).\r\n");
return 0;
}
else
{
DEBUG_INFO ("done.\r\n");
gpg_do_write_simple (NR_DO_KEYSTRING_RC, new_ks0, KS_META_SIZE);
}
}
gpg_pw_reset_err_counter (PW_ERR_RC);
return 1;
}
static void
encrypt (const uint8_t *key, const uint8_t *iv, uint8_t *data, int len)
{
mbedtls_aes_context aes;
uint8_t iv0[INITIAL_VECTOR_SIZE];
size_t iv_offset;
DEBUG_INFO ("ENC\r\n");
DEBUG_BINARY (data, len);
mbedtls_aes_setkey_enc (&aes, key, 128);
memcpy (iv0, iv, INITIAL_VECTOR_SIZE);
iv_offset = 0;
mbedtls_aes_crypt_cfb128 (&aes, MBEDTLS_AES_ENCRYPT, len, &iv_offset, iv0, data, data);
}
/* For three keys: Signing, Decryption, and Authentication */
struct key_data kd[3];
static void
decrypt (const uint8_t *key, const uint8_t *iv, uint8_t *data, int len)
{
mbedtls_aes_context aes;
uint8_t iv0[INITIAL_VECTOR_SIZE];
size_t iv_offset;
mbedtls_aes_setkey_enc (&aes, key, 128); /* This is setkey_enc, because of CFB. */
memcpy (iv0, iv, INITIAL_VECTOR_SIZE);
iv_offset = 0;
mbedtls_aes_crypt_cfb128 (&aes, MBEDTLS_AES_DECRYPT, len, &iv_offset, iv0, data, data);
DEBUG_INFO ("DEC\r\n");
DEBUG_BINARY (data, len);
}
static void
encrypt_dek (const uint8_t *key_string, uint8_t *dek)
{
mbedtls_aes_context aes;
mbedtls_aes_setkey_enc (&aes, key_string, 128);
mbedtls_aes_crypt_ecb (&aes, MBEDTLS_AES_ENCRYPT, dek, dek);
}
static void
decrypt_dek (const uint8_t *key_string, uint8_t *dek)
{
mbedtls_aes_context aes;
mbedtls_aes_setkey_dec (&aes, key_string, 128);
mbedtls_aes_crypt_ecb (&aes, MBEDTLS_AES_DECRYPT, dek, dek);
}
static uint8_t
get_do_ptr_nr_for_kk (enum kind_of_key kk)
{
switch (kk)
{
case GPG_KEY_FOR_SIGNING:
return NR_DO_PRVKEY_SIG;
case GPG_KEY_FOR_DECRYPTION:
return NR_DO_PRVKEY_DEC;
case GPG_KEY_FOR_AUTHENTICATION:
return NR_DO_PRVKEY_AUT;
}
return NR_DO_PRVKEY_SIG;
}
void
gpg_do_clear_prvkey (enum kind_of_key kk)
{
memset (kd[kk].data, 0, MAX_PRVKEY_LEN);
}
#define CHECKSUM_ADDR(kdi,prvkey_len) \
(&(kdi).data[prvkey_len / sizeof (uint32_t)])
#define kdi_len(prvkey_len) (prvkey_len+DATA_ENCRYPTION_KEY_SIZE)
struct key_data_internal {
uint32_t data[(MAX_PRVKEY_LEN+DATA_ENCRYPTION_KEY_SIZE) / sizeof (uint32_t)];
/*
* Secret key data.
* RSA: p and q, ECDSA/ECDH: d, EdDSA: a+seed
*/
/* Checksum */
};
#define CKDC_CALC 0
#define CKDC_CHECK 1
static int
compute_key_data_checksum (struct key_data_internal *kdi, int prvkey_len,
int check_or_calc)
{
unsigned int i;
uint32_t d[4] = { 0, 0, 0, 0 };
uint32_t *checksum = CHECKSUM_ADDR (*kdi, prvkey_len);
for (i = 0; i < prvkey_len / sizeof (uint32_t); i++)
d[i&3] ^= kdi->data[i];
if (check_or_calc == CKDC_CALC) /* store */
{
memcpy (checksum, d, DATA_ENCRYPTION_KEY_SIZE);
return 0;
}
else /* check */
return memcmp (checksum, d, DATA_ENCRYPTION_KEY_SIZE) == 0;
}
/*
* Return 1 on success,
* 0 if none,
* -1 on error,
*/
int
gpg_do_load_prvkey (enum kind_of_key kk, int who, const uint8_t *keystring)
{
uint8_t nr = get_do_ptr_nr_for_kk (kk);
int prvkey_len = gpg_get_algo_attr_key_size (kk, GPG_KEY_PRIVATE);
const uint8_t *do_data = do_ptr[nr];
const uint8_t *key_addr;
uint8_t dek[DATA_ENCRYPTION_KEY_SIZE];
const uint8_t *iv;
struct key_data_internal kdi;
DEBUG_INFO ("Loading private key: ");
DEBUG_BYTE (kk);
if (do_data == NULL)
return 0;
key_addr = kd[kk].pubkey - prvkey_len;
memcpy (kdi.data, key_addr, prvkey_len);
iv = &do_data[1];
memcpy (CHECKSUM_ADDR (kdi, prvkey_len),
iv + INITIAL_VECTOR_SIZE, DATA_ENCRYPTION_KEY_SIZE);
memcpy (dek, iv + DATA_ENCRYPTION_KEY_SIZE*(who+1), DATA_ENCRYPTION_KEY_SIZE);
decrypt_dek (keystring, dek);
decrypt (dek, iv, (uint8_t *)&kdi, kdi_len (prvkey_len));
memset (dek, 0, DATA_ENCRYPTION_KEY_SIZE);
if (!compute_key_data_checksum (&kdi, prvkey_len, CKDC_CHECK))
{
DEBUG_INFO ("gpg_do_load_prvkey failed.\r\n");
return -1;
}
memcpy (kd[kk].data, kdi.data, prvkey_len);
DEBUG_BINARY (kd[kk].data, prvkey_len);
return 1;
}
static int8_t num_prv_keys;
static void
gpg_do_delete_prvkey (enum kind_of_key kk, int clean_page_full)
{
uint8_t nr = get_do_ptr_nr_for_kk (kk);
const uint8_t *do_data = do_ptr[nr];
uint8_t *key_addr;
int prvkey_len = gpg_get_algo_attr_key_size (kk, GPG_KEY_PRIVATE);
int key_size = gpg_get_algo_attr_key_size (kk, GPG_KEY_STORAGE);
if (do_data == NULL)
{
if (clean_page_full)
flash_key_release_page (kk);
return;
}
do_ptr[nr] = NULL;
flash_do_release (do_data);
key_addr = (uint8_t *)kd[kk].pubkey - prvkey_len;
kd[kk].pubkey = NULL;
if (clean_page_full)
flash_key_release_page (kk);
else
flash_key_release (key_addr, key_size);
if (admin_authorized == BY_ADMIN && kk == GPG_KEY_FOR_SIGNING)
{ /* Recover admin keystring DO. */
const uint8_t *ks_pw3 = gpg_do_read_simple (NR_DO_KEYSTRING_PW3);
if (ks_pw3 != NULL)
{
uint8_t ks0[KEYSTRING_SIZE];
ks0[0] = ks_pw3[0] | PW_LEN_KEYSTRING_BIT;
memcpy (KS_GET_SALT (ks0), KS_GET_SALT (ks_pw3), SALT_SIZE);
memcpy (KS_GET_KEYSTRING (ks0), keystring_md_pw3, KEYSTRING_MD_SIZE);
gpg_do_write_simple (NR_DO_KEYSTRING_PW3, ks0, KEYSTRING_SIZE);
}
}
if (--num_prv_keys == 0)
{
/* Delete PW1 and RC if any. */
gpg_do_write_simple (NR_DO_KEYSTRING_PW1, NULL, 0);
gpg_do_write_simple (NR_DO_KEYSTRING_RC, NULL, 0);
ac_reset_pso_cds ();
ac_reset_other ();
if (admin_authorized == BY_USER)
ac_reset_admin ();
}
}
void
gpg_do_terminate (void)
{
int i;
for (i = 0; i < 3; i++)
kd[i].pubkey = NULL;
for (i = 0; i < NR_DO__LAST__; i++)
do_ptr[i] = NULL;
num_prv_keys = 0;
data_objects_number_of_bytes = 0;
digital_signature_counter = 0;
pw1_lifetime_p = NULL;
pw_err_counter_p[PW_ERR_PW1] = NULL;
pw_err_counter_p[PW_ERR_RC] = NULL;
pw_err_counter_p[PW_ERR_PW3] = NULL;
algo_attr_sig_p = algo_attr_dec_p = algo_attr_aut_p = NULL;
}
static int
gpg_do_write_prvkey (enum kind_of_key kk, const uint8_t *key_data,
int prvkey_len, const uint8_t *keystring_admin,
const uint8_t *pubkey)
{
uint8_t nr = get_do_ptr_nr_for_kk (kk);
int attr = gpg_get_algo_attr (kk);;
const uint8_t *p;
int r;
struct prvkey_data prv;
struct prvkey_data *pd = &prv;
uint8_t *key_addr;
const uint8_t *dek, *iv;
struct key_data_internal kdi;
int pubkey_len;
uint8_t ks[KEYSTRING_MD_SIZE];
enum kind_of_key kk0;
int pw_len;
const uint8_t *initial_pw;
DEBUG_INFO ("Key import\r\n");
DEBUG_SHORT (prvkey_len);
/* Delete it first, if any. */
gpg_do_delete_prvkey (kk, CLEAN_SINGLE);
if (attr == ALGO_SECP256K1)
{
pubkey_len = prvkey_len * 2;
if (prvkey_len != 32)
return -1;
}
else if (attr == ALGO_CURVE25519)
{
pubkey_len = prvkey_len;
if (prvkey_len != 32)
return -1;
}
else if (attr == ALGO_ED25519)
{
pubkey_len = prvkey_len / 2;
if (prvkey_len != 64)
return -1;
}
else if (attr == ALGO_ED448)
{
pubkey_len = 57 + 1; /* +1 to be even. */
if (prvkey_len != 128)
return -1;
}
else if (attr == ALGO_X448)
{
pubkey_len = prvkey_len;
if (prvkey_len != 56)
return -1;
}
else /* RSA */
{
int key_size = gpg_get_algo_attr_key_size (kk, GPG_KEY_STORAGE);
pubkey_len = prvkey_len;
if (prvkey_len + pubkey_len != key_size)
return -1;
}
DEBUG_INFO ("Getting keystore address...\r\n");
key_addr = flash_key_alloc (kk);
if (key_addr == NULL)
return -1;
kd[kk].pubkey = key_addr + prvkey_len;
num_prv_keys++;
DEBUG_INFO ("key_addr: ");
DEBUG_WORD ((uint32_t)key_addr);
memcpy (kdi.data, key_data, prvkey_len);
memset ((uint8_t *)kdi.data + prvkey_len, 0, MAX_PRVKEY_LEN - prvkey_len);
compute_key_data_checksum (&kdi, prvkey_len, CKDC_CALC);
dek = random_bytes_get (); /* 32-byte random bytes */
iv = dek + DATA_ENCRYPTION_KEY_SIZE;
memcpy (pd->dek_encrypted_1, dek, DATA_ENCRYPTION_KEY_SIZE);
memcpy (pd->dek_encrypted_2, dek, DATA_ENCRYPTION_KEY_SIZE);
memcpy (pd->dek_encrypted_3, dek, DATA_ENCRYPTION_KEY_SIZE);
gpg_do_get_initial_pw_setting (0, &pw_len, &initial_pw);
s2k (NULL, 0, initial_pw, pw_len, ks);
/* Handle existing keys and keystring DOs. */
gpg_do_write_simple (NR_DO_KEYSTRING_PW1, NULL, 0);
gpg_do_write_simple (NR_DO_KEYSTRING_RC, NULL, 0);
for (kk0 = 0; kk0 <= GPG_KEY_FOR_AUTHENTICATION; kk0++)
if (kk0 != kk)
{
gpg_do_chks_prvkey (kk0, admin_authorized, keystring_md_pw3,
BY_USER, ks);
gpg_do_chks_prvkey (kk0, BY_RESETCODE, NULL, 0, NULL);
}
encrypt (dek, iv, (uint8_t *)&kdi, kdi_len (prvkey_len));
r = flash_key_write (key_addr, (const uint8_t *)kdi.data, prvkey_len,
pubkey, pubkey_len);
if (r < 0)
{
random_bytes_free (dek);
memset (pd, 0, sizeof (struct prvkey_data));
return r;
}
memcpy (pd->iv, iv, INITIAL_VECTOR_SIZE);
memcpy (pd->checksum_encrypted, CHECKSUM_ADDR (kdi, prvkey_len),
DATA_ENCRYPTION_KEY_SIZE);
encrypt_dek (ks, pd->dek_encrypted_1);
memset (pd->dek_encrypted_2, 0, DATA_ENCRYPTION_KEY_SIZE);
if (keystring_admin)
encrypt_dek (keystring_admin, pd->dek_encrypted_3);
else
memset (pd->dek_encrypted_3, 0, DATA_ENCRYPTION_KEY_SIZE);
p = flash_do_write (nr, (const uint8_t *)pd, sizeof (struct prvkey_data));
do_ptr[nr] = p;
random_bytes_free (dek);
memset (pd, 0, sizeof (struct prvkey_data));
if (p == NULL)
return -1;
if (keystring_admin && kk == GPG_KEY_FOR_SIGNING)
{
const uint8_t *ks_admin = gpg_do_read_simple (NR_DO_KEYSTRING_PW3);
uint8_t ks_info[KS_META_SIZE];
if (ks_admin != NULL && (ks_admin[0] & PW_LEN_KEYSTRING_BIT))
{
ks_info[0] = ks_admin[0] & PW_LEN_MASK;
memcpy (KS_GET_SALT (ks_info), KS_GET_SALT (ks_admin), SALT_SIZE);
gpg_do_write_simple (NR_DO_KEYSTRING_PW3, ks_info, KS_META_SIZE);
}
else
{
DEBUG_INFO ("No admin keystring!\r\n");
}
}
return 0;
}
int
gpg_do_chks_prvkey (enum kind_of_key kk,
int who_old, const uint8_t *old_ks,
int who_new, const uint8_t *new_ks)
{
uint8_t nr = get_do_ptr_nr_for_kk (kk);
const uint8_t *do_data = do_ptr[nr];
uint8_t dek[DATA_ENCRYPTION_KEY_SIZE];
struct prvkey_data prv;
struct prvkey_data *pd = &prv;
uint8_t *dek_p;
int update_needed = 0;
int r = 1; /* Success */
if (do_data == NULL)
return 0; /* No private key */
memcpy (pd, &do_data[1], sizeof (struct prvkey_data));
dek_p = ((uint8_t *)pd) + INITIAL_VECTOR_SIZE
+ DATA_ENCRYPTION_KEY_SIZE * who_old;
memcpy (dek, dek_p, DATA_ENCRYPTION_KEY_SIZE);
if (who_new == 0) /* Remove */
{
int i;
for (i = 0; i < DATA_ENCRYPTION_KEY_SIZE; i++)
if (dek_p[i] != 0)
{
update_needed = 1;
dek_p[i] = 0;
}
}
else
{
decrypt_dek (old_ks, dek);
encrypt_dek (new_ks, dek);
dek_p += DATA_ENCRYPTION_KEY_SIZE * (who_new - who_old);
if (memcmp (dek_p, dek, DATA_ENCRYPTION_KEY_SIZE) != 0)
{
memcpy (dek_p, dek, DATA_ENCRYPTION_KEY_SIZE);
update_needed = 1;
}
}
if (update_needed)
{
const uint8_t *p;
flash_do_release (do_data);
do_ptr[nr] = NULL;
p = flash_do_write (nr, (const uint8_t *)pd, sizeof (struct prvkey_data));
do_ptr[nr] = p;
if (p == NULL)
r = -1;
}
memset (pd, 0, sizeof (struct prvkey_data));
return r;
}
static enum kind_of_key
kkb_to_kk (uint8_t kk_byte)
{
enum kind_of_key kk;
if (kk_byte == 0xb6)
kk = GPG_KEY_FOR_SIGNING;
else if (kk_byte == 0xb8)
kk = GPG_KEY_FOR_DECRYPTION;
else /* 0xa4 */
kk = GPG_KEY_FOR_AUTHENTICATION;
return kk;
}
/*
* RSA-2048:
* 4d, xx, xx, xx: Extended Header List
* b6 00 (SIG) / b8 00 (DEC) / a4 00 (AUT)
* 7f48, xx: cardholder private key template
* 91 L<E>: 91=tag of E, L<E>: length of E
* 92 Lh<P> Ll<P>: 92=tag of P, L<P>: length of P
* 93 Lh<Q> Ll<Q>: 93=tag of Q, L<Q>: length of Q
* 5f48, xx xx xx: cardholder private key
* <E: 4-byte>, <P: 128-byte>, <Q: 128-byte>
*
* RSA-4096:
* 4d, 82, 02, 18: Extended Header List
* b6 00 (SIG) / b8 00 (DEC) / a4 00 (AUT)
* 7f48, 0a: cardholder private key template
* 91 L<E>: 91=tag of E, L<E>: length of E
* 92 82 Lh<P> Ll<P>: 92=tag of P, L<P>: length of P
* 93 82 Lh<Q> Ll<Q>: 93=tag of Q, L<Q>: length of Q
* 5f48, 82 02 04: cardholder private key
* <E: 4-byte>, <P: 256-byte>, <Q: 256-byte>
*
* ECDSA / ECDH / EdDSA:
* 4d, 2a: Extended Header List
* b6 00 (SIG) / b8 00 (DEC) / a4 00 (AUT)
* 7f48, 02: cardholder private key template
* 9x LEN: 9x=tag of private key d, LEN=length of d
* 5f48, 20: cardholder private key
* <d: 32-byte>
*/
static int
proc_key_import (const uint8_t *data, int len)
{
int r = -1;
enum kind_of_key kk;
const uint8_t *keystring_admin;
int attr;
const uint8_t *p = data;
uint8_t pubkey[512];
#ifdef KDF_DO_REQUIRED
const uint8_t *kdf_do = do_ptr[NR_DO_KDF];
if (kdf_do == NULL)
return 0; /* Error. */
#endif
if (admin_authorized == BY_ADMIN)
keystring_admin = keystring_md_pw3;
else
keystring_admin = NULL;
DEBUG_BINARY (data, len);
if (*p++ != 0x4d)
return 0;
/* length field */
if (*p == 0x82)
p += 3;
else if (*p == 0x81)
p += 2;
else
p += 1;
kk = kkb_to_kk (*p);
if (kk == GPG_KEY_FOR_SIGNING)
{
ac_reset_pso_cds ();
gpg_reset_digital_signature_counter ();
}
else
ac_reset_other ();
attr = gpg_get_algo_attr (kk);
if ((len <= 12 && (attr == ALGO_SECP256K1 || attr == ALGO_CURVE25519
|| attr == ALGO_ED25519 || attr == ALGO_ED448
|| attr == ALGO_X448))
|| (len <= 22 && attr == ALGO_RSA2K) || (len <= 24 && attr == ALGO_RSA4K))
{ /* Deletion of the key */
gpg_do_delete_prvkey (kk, CLEAN_SINGLE);
return 1;
}
if (attr == ALGO_RSA2K)
{
/* It should starts with 00 01 00 01 (E), skiping E (4-byte) */
r = modulus_calc (&data[26], len - 26, pubkey);
if (r >= 0)
r = gpg_do_write_prvkey (kk, &data[26], len - 26, keystring_admin,
pubkey);
}
else if (attr == ALGO_RSA4K)
{
/* It should starts with 00 01 00 01 (E), skiping E (4-byte) */
r = modulus_calc (&data[28], len - 28, pubkey);
if (r >= 0)
r = gpg_do_write_prvkey (kk, &data[28], len - 28, keystring_admin,
pubkey);
}
else if (attr == ALGO_SECP256K1)
{
r = ecc_compute_public_p256k1 (&data[12], pubkey);
if (r >= 0)
r = gpg_do_write_prvkey (kk, &data[12], len - 12, keystring_admin,
pubkey);
}
else if (attr == ALGO_CURVE25519)
{
uint8_t priv[32];
int i;
if (len - 12 != 32)
return 0; /* Error. */
for (i = 0; i < 32; i++)
priv[31-i] = data[12+i];
ecdh_compute_public_25519 (priv, pubkey);
r = gpg_do_write_prvkey (kk, priv, 32, keystring_admin, pubkey);
}
else if (attr == ALGO_ED25519)
{
uint8_t hash[64];
if (len - 12 != 32)
return 0; /* Error. */
mbedtls_sha512_context ctx;
mbedtls_sha512_init(&ctx);
mbedtls_sha512_starts (&ctx, 0);
mbedtls_sha512_update (&ctx, &data[12], 32);
mbedtls_sha512_finish (&ctx, hash);
mbedtls_sha512_free (&ctx);
hash[0] &= 248;
hash[31] &= 127;
hash[31] |= 64;
eddsa_compute_public_25519 (hash, pubkey);
r = gpg_do_write_prvkey (kk, hash, 64, keystring_admin, pubkey);
}
else if (attr == ALGO_ED448)
{
shake_context ctx;
uint8_t hash[128];
if (len - 12 != 57)
return 0; /* Error. */
shake256_start (&ctx);
shake256_update (&ctx, &data[12], 57);
shake256_finish (&ctx, hash, 2*57);
memset (hash+114, 0, 128-114);
ed448_compute_public (pubkey, hash);
pubkey[57] = 0;
r = gpg_do_write_prvkey (kk, hash, 128, keystring_admin, pubkey);
}
else if (attr == ALGO_X448)
{
uint8_t priv[56];
if (len - 12 != 56)
return 0; /* Error. */
memcpy (priv, data+12, 56);
ecdh_compute_public_x448 (pubkey, priv);
r = gpg_do_write_prvkey (kk, priv, 56, keystring_admin, pubkey);
}
if (r < 0)
return 0;
else
return 1;
}
static const uint16_t cmp_ch_data[] = {
3,
GPG_DO_NAME,
GPG_DO_LANGUAGE,
GPG_DO_SEX,
};
static const uint16_t cmp_app_data[] = {
#ifdef ACKBTN_SUPPORT
4,
#else
3,
#endif
GPG_DO_AID,
GPG_DO_HIST_BYTES,
GPG_DO_DISCRETIONARY,
#ifdef ACKBTN_SUPPORT
GPG_DO_FEATURE_MNGMNT,
#endif
};
static const uint16_t cmp_discretionary[] = {
#ifdef ACKBTN_SUPPORT
11,
#else
8,
#endif
GPG_DO_EXTCAP,
GPG_DO_ALG_SIG, GPG_DO_ALG_DEC, GPG_DO_ALG_AUT,
GPG_DO_PW_STATUS,
GPG_DO_FP_ALL, GPG_DO_CAFP_ALL, GPG_DO_KGTIME_ALL,
#ifdef ACKBTN_SUPPORT
GPG_DO_UIF_SIG, GPG_DO_UIF_DEC, GPG_DO_UIF_AUT
#endif
};
static const uint16_t cmp_ss_temp[] = { 1, GPG_DO_DS_COUNT };
static const struct do_table_entry
gpg_do_table[] = {
/* Variables: Fixed size */
{ GPG_DO_SEX, DO_VAR, AC_ALWAYS, AC_ADMIN_AUTHORIZED, &do_ptr[0] },
{ GPG_DO_FP_SIG, DO_VAR, AC_ALWAYS, AC_ADMIN_AUTHORIZED, &do_ptr[1] },
{ GPG_DO_FP_DEC, DO_VAR, AC_ALWAYS, AC_ADMIN_AUTHORIZED, &do_ptr[2] },
{ GPG_DO_FP_AUT, DO_VAR, AC_ALWAYS, AC_ADMIN_AUTHORIZED, &do_ptr[3] },
{ GPG_DO_CAFP_1, DO_VAR, AC_ALWAYS, AC_ADMIN_AUTHORIZED, &do_ptr[4] },
{ GPG_DO_CAFP_2, DO_VAR, AC_ALWAYS, AC_ADMIN_AUTHORIZED, &do_ptr[5] },
{ GPG_DO_CAFP_3, DO_VAR, AC_ALWAYS, AC_ADMIN_AUTHORIZED, &do_ptr[6] },
{ GPG_DO_KGTIME_SIG, DO_VAR, AC_ALWAYS, AC_ADMIN_AUTHORIZED, &do_ptr[7] },
{ GPG_DO_KGTIME_DEC, DO_VAR, AC_ALWAYS, AC_ADMIN_AUTHORIZED, &do_ptr[8] },
{ GPG_DO_KGTIME_AUT, DO_VAR, AC_ALWAYS, AC_ADMIN_AUTHORIZED, &do_ptr[9] },
/* Variables: Variable size */
{ GPG_DO_LOGIN_DATA, DO_VAR, AC_ALWAYS, AC_ADMIN_AUTHORIZED, &do_ptr[10] },
{ GPG_DO_URL, DO_VAR, AC_ALWAYS, AC_ADMIN_AUTHORIZED, &do_ptr[11] },
{ GPG_DO_NAME, DO_VAR, AC_ALWAYS, AC_ADMIN_AUTHORIZED, &do_ptr[12] },
{ GPG_DO_LANGUAGE, DO_VAR, AC_ALWAYS, AC_ADMIN_AUTHORIZED, &do_ptr[13] },
/* Pseudo DO READ: calculated */
{ GPG_DO_FP_ALL, DO_PROC_READ, AC_ALWAYS, AC_NEVER, do_fp_all },
{ GPG_DO_CAFP_ALL, DO_PROC_READ, AC_ALWAYS, AC_NEVER, do_cafp_all },
{ GPG_DO_KGTIME_ALL, DO_PROC_READ, AC_ALWAYS, AC_NEVER, do_kgtime_all },
/* Pseudo DO READ: calculated, not changeable by user */
{ GPG_DO_DS_COUNT, DO_PROC_READ, AC_ALWAYS, AC_NEVER, do_ds_count },
{ GPG_DO_AID, DO_PROC_READ, AC_ALWAYS, AC_NEVER, do_openpgpcard_aid },
{ GPG_DO_ALG_INFO, DO_PROC_READ, AC_ALWAYS, AC_NEVER, do_alg_info },
/* Pseudo DO READ/WRITE: calculated */
{ GPG_DO_PW_STATUS, DO_PROC_READWRITE, AC_ALWAYS, AC_ADMIN_AUTHORIZED,
rw_pw_status },
{ GPG_DO_ALG_SIG, DO_PROC_READWRITE, AC_ALWAYS, AC_ADMIN_AUTHORIZED,
rw_algorithm_attr },
{ GPG_DO_ALG_DEC, DO_PROC_READWRITE, AC_ALWAYS, AC_ADMIN_AUTHORIZED,
rw_algorithm_attr },
{ GPG_DO_ALG_AUT, DO_PROC_READWRITE, AC_ALWAYS, AC_ADMIN_AUTHORIZED,
rw_algorithm_attr },
#ifdef ACKBTN_SUPPORT
{ GPG_DO_UIF_SIG, DO_PROC_READWRITE, AC_ALWAYS, AC_ADMIN_AUTHORIZED, rw_uif },
{ GPG_DO_UIF_DEC, DO_PROC_READWRITE, AC_ALWAYS, AC_ADMIN_AUTHORIZED, rw_uif },
{ GPG_DO_UIF_AUT, DO_PROC_READWRITE, AC_ALWAYS, AC_ADMIN_AUTHORIZED, rw_uif },
#endif
{ GPG_DO_KDF, DO_PROC_READWRITE, AC_ALWAYS, AC_ADMIN_AUTHORIZED,
rw_kdf },
/* Fixed data */
{ GPG_DO_HIST_BYTES, DO_FIXED, AC_ALWAYS, AC_NEVER, historical_bytes },
{ GPG_DO_EXTCAP, DO_FIXED, AC_ALWAYS, AC_NEVER, extended_capabilities },
#ifdef ACKBTN_SUPPORT
{ GPG_DO_FEATURE_MNGMNT, DO_FIXED, AC_ALWAYS, AC_NEVER, feature_mngmnt },
#endif
/* Compound data: Read access only */
{ GPG_DO_CH_DATA, DO_CMP_READ, AC_ALWAYS, AC_NEVER, cmp_ch_data },
{ GPG_DO_APP_DATA, DO_CMP_READ, AC_ALWAYS, AC_NEVER, cmp_app_data },
{ GPG_DO_DISCRETIONARY, DO_CMP_READ, AC_ALWAYS, AC_NEVER, cmp_discretionary },
{ GPG_DO_SS_TEMP, DO_CMP_READ, AC_ALWAYS, AC_NEVER, cmp_ss_temp },
/* Simple data: write access only */
{ GPG_DO_RESETTING_CODE, DO_PROC_WRITE, AC_NEVER, AC_ADMIN_AUTHORIZED,
proc_resetting_code },
/* Compound data: Write access only */
{ GPG_DO_KEY_IMPORT, DO_PROC_WRITE, AC_NEVER, AC_ADMIN_AUTHORIZED,
proc_key_import },
#if 0
/* Card holder certificate is handled in special way, as its size is big */
{ GPG_DO_CH_CERTIFICATE, DO_VAR, AC_ALWAYS, AC_ADMIN_AUTHORIZED, NULL },
#endif
};
#define NUM_DO_ENTRIES (int)(sizeof (gpg_do_table) \
/ sizeof (struct do_table_entry))
/*
* Reading data from Flash ROM, initialize DO_PTR, PW_ERR_COUNTERS, etc.
*/
void
gpg_data_scan (const uint8_t *do_start, const uint8_t *do_end)
{
const uint8_t *p;
int i;
const uint8_t *dsc_h14_p, *dsc_l10_p;
int dsc_h14, dsc_l10;
dsc_h14_p = dsc_l10_p = NULL;
pw1_lifetime_p = NULL;
pw_err_counter_p[PW_ERR_PW1] = NULL;
pw_err_counter_p[PW_ERR_RC] = NULL;
pw_err_counter_p[PW_ERR_PW3] = NULL;
algo_attr_sig_p = algo_attr_dec_p = algo_attr_aut_p = NULL;
digital_signature_counter = 0;
uif_flags = 0;
/* Clear all data objects. */
for (i = 0; i < NR_DO__LAST__; i++)
do_ptr[i] = NULL;
/* When the card is terminated no data objects are valid. */
if (do_start == NULL)
return;
/* Traverse DO, counters, etc. in DATA pool */
p = do_start;
while (p < do_end && *p != NR_EMPTY)
{
uint8_t nr = *p++;
uint8_t second_byte = *p;
if (nr == 0x00 && second_byte == 0x00)
p++; /* Skip released word */
else
{
if (nr < 0x80)
{
/* It's Data Object */
if (nr < NR_DO__LAST__)
do_ptr[nr] = p;
p += second_byte + 1; /* second_byte has length */
if (((uintptr_t)p & 1))
p++;
}
else if (nr >= 0x80 && nr <= 0xbf)
/* Encoded data of Digital Signature Counter: upper 14-bit */
{
dsc_h14_p = p - 1;
p++;
}
else if (nr >= 0xc0 && nr <= 0xc3)
/* Encoded data of Digital Signature Counter: lower 10-bit */
{
dsc_l10_p = p - 1;
p++;
}
else
switch (nr)
{
case NR_BOOL_PW1_LIFETIME:
pw1_lifetime_p = p - 1;
p++;
break;
case NR_KEY_ALGO_ATTR_SIG:
algo_attr_sig_p = p - 1;
p++;
break;
case NR_KEY_ALGO_ATTR_DEC:
algo_attr_dec_p = p - 1;
p++;
break;
case NR_KEY_ALGO_ATTR_AUT:
algo_attr_aut_p = p - 1;
p++;
break;
case NR_DO_UIF_SIG:
case NR_DO_UIF_DEC:
case NR_DO_UIF_AUT:
uif_flags &= ~(3 << ((nr - NR_DO_UIF_SIG) * 2));
uif_flags |= (second_byte & 3) << ((nr - NR_DO_UIF_SIG) * 2);
p++;
break;
case NR_COUNTER_123:
p++;
if (second_byte <= PW_ERR_PW3)
pw_err_counter_p[second_byte] = p;
p += 2;
break;
default:
/* Something going wrong. ignore this word. */
p++;
break;
}
}
}
flash_set_data_pool_last (p);
num_prv_keys = 0;
if (do_ptr[NR_DO_PRVKEY_SIG] != NULL)
num_prv_keys++;
if (do_ptr[NR_DO_PRVKEY_DEC] != NULL)
num_prv_keys++;
if (do_ptr[NR_DO_PRVKEY_AUT] != NULL)
num_prv_keys++;
data_objects_number_of_bytes = 0;
for (i = 0; i < NR_DO__LAST__; i++)
if (do_ptr[i] != NULL)
data_objects_number_of_bytes += *do_ptr[i];
if (dsc_l10_p == NULL)
dsc_l10 = 0;
else
dsc_l10 = ((*dsc_l10_p - 0xc0) << 8) | *(dsc_l10_p + 1);
if (dsc_h14_p == NULL)
dsc_h14 = 0;
else
{
dsc_h14 = ((*dsc_h14_p - 0x80) << 8) | *(dsc_h14_p + 1);
if (dsc_l10_p == NULL)
DEBUG_INFO ("something wrong in DSC\r\n"); /* weird??? */
else if (dsc_l10_p < dsc_h14_p)
/* Possibly, power off during writing dsc_l10 */
dsc_l10 = 0;
}
digital_signature_counter = (dsc_h14 << 10) | dsc_l10;
}
/*
* Write all data to newly allocated Flash ROM page (from P_START),
* updating PW1_LIFETIME_P, PW_ERR_COUNTER_P, and DO_PTR.
* Called by flash_copying_gc.
*/
void
gpg_data_copy (const uint8_t *p_start)
{
const uint8_t *p;
int i;
int v;
p = gpg_write_digital_signature_counter (p_start, digital_signature_counter);
if (pw1_lifetime_p != NULL)
{
flash_bool_write_internal (p, NR_BOOL_PW1_LIFETIME);
pw1_lifetime_p = p;
p += 2;
}
if (algo_attr_sig_p != NULL)
{
flash_enum_write_internal (p, NR_KEY_ALGO_ATTR_SIG, algo_attr_sig_p[1]);
algo_attr_sig_p = p;
p += 2;
}
if (algo_attr_dec_p != NULL)
{
flash_enum_write_internal (p, NR_KEY_ALGO_ATTR_DEC, algo_attr_dec_p[1]);
algo_attr_dec_p = p;
p += 2;
}
if (algo_attr_aut_p != NULL)
{
flash_enum_write_internal (p, NR_KEY_ALGO_ATTR_AUT, algo_attr_aut_p[1]);
algo_attr_aut_p = p;
p += 2;
}
for (i = 0; i < 3; i++)
if ((v = flash_cnt123_get_value (pw_err_counter_p[i])) != 0)
{
flash_cnt123_write_internal (p, i, v);
pw_err_counter_p[i] = p + 2;
p += 4;
}
for (i = 0; i < 3; i++)
if ((v = (uif_flags >> (i * 2)) & 3))
{
flash_enum_write_internal (p, NR_DO_UIF_SIG + i, v);
p += 2;
}
data_objects_number_of_bytes = 0;
for (i = 0; i < NR_DO__LAST__; i++)
if (do_ptr[i] != NULL)
{
const uint8_t *do_data = do_ptr[i];
int len = do_data[0];
flash_do_write_internal (p, i, &do_data[1], len);
do_ptr[i] = p + 1;
p += 2 + ((len + 1) & ~1);
data_objects_number_of_bytes += len;
}
flash_set_data_pool_last (p);
}
static const struct do_table_entry *
get_do_entry (uint16_t tag)
{
int i;
for (i = 0; i < NUM_DO_ENTRIES; i++)
if (gpg_do_table[i].tag == tag)
return &gpg_do_table[i];
return NULL;
}
static void
copy_do_1 (uint16_t tag, const uint8_t *do_data, int with_tag)
{
int len;
if (with_tag)
{
copy_tag (tag);
if (do_data[0] >= 128)
*res_p++ = 0x81;
len = do_data[0] + 1;
}
else
{
len = do_data[0];
do_data++;
}
memcpy (res_p, do_data, len);
res_p += len;
}
static int
copy_do (const struct do_table_entry *do_p, int with_tag)
{
if (do_p == NULL)
return 0;
if (!ac_check_status (do_p->ac_read))
return -1;
switch (do_p->do_type)
{
case DO_FIXED:
{
const uint8_t *do_data = (const uint8_t *)do_p->obj;
if (do_data == NULL)
return 0;
else
copy_do_1 (do_p->tag, do_data, with_tag);
break;
}
case DO_VAR:
{
const uint8_t *do_data = *(const uint8_t **)do_p->obj;
if (do_data == NULL)
return 0;
else
copy_do_1 (do_p->tag, do_data, with_tag);
break;
}
case DO_CMP_READ:
{
int i;
const uint16_t *cmp_data = (const uint16_t *)do_p->obj;
int num_components = cmp_data[0];
uint8_t *len_p = NULL;
if (with_tag)
{
copy_tag (do_p->tag);
*res_p++ = 0x81; /* Assume it's less than 256 */
len_p = res_p;
*res_p++ = 0; /* for now */
}
for (i = 0; i < num_components; i++)
{
uint16_t tag0;
const struct do_table_entry *do0_p;
tag0 = cmp_data[i+1];
do0_p = get_do_entry (tag0);
if (copy_do (do0_p, 1) < 0)
return -1;
}
if (len_p)
*len_p = res_p - len_p - 1;
break;
}
case DO_PROC_READ:
{
void (*do_func)(uint16_t, int) = (void (*)(uint16_t, int))do_p->obj;
do_func (do_p->tag, with_tag);
return 1;
}
case DO_PROC_READWRITE:
{
int (*rw_func)(uint16_t, int, const uint8_t *, int, int)
= (int (*)(uint16_t, int, const uint8_t *, int, int))do_p->obj;
return rw_func (do_p->tag, with_tag, NULL, 0, 0);
}
case DO_PROC_WRITE:
return -1;
}
return 1;
}
/*
* Process GET_DATA request on Data Object specified by TAG
* Call write_res_adpu to fill data returned
*/
void
gpg_do_get_data (uint16_t tag, int with_tag)
{
#if defined(CERTDO_SUPPORT)
if (tag == GPG_DO_CH_CERTIFICATE)
{
apdu.res_apdu_data = (uint8_t *)ch_certificate_start;
apdu.res_apdu_data_len = ((apdu.res_apdu_data[2] << 8) | apdu.res_apdu_data[3]);
if (apdu.res_apdu_data_len == 0xffff)
{
apdu.res_apdu_data_len = 0;
GPG_NO_RECORD ();
}
else
/* Add length of (tag+len) */
apdu.res_apdu_data_len += 4;
}
else
#endif
{
const struct do_table_entry *do_p = get_do_entry (tag);
res_p = res_APDU;
DEBUG_INFO (" ");
DEBUG_SHORT (tag);
if (do_p)
{
if (copy_do (do_p, with_tag) < 0)
/* Overwriting partially written result */
GPG_SECURITY_FAILURE ();
else
{
res_APDU_size = res_p - res_APDU;
GPG_SUCCESS ();
}
}
else
GPG_NO_RECORD ();
}
}
void
gpg_do_put_data (uint16_t tag, const uint8_t *data, int len)
{
const struct do_table_entry *do_p = get_do_entry (tag);
DEBUG_INFO (" ");
DEBUG_SHORT (tag);
if (do_p)
{
if (!ac_check_status (do_p->ac_write))
{
GPG_SECURITY_FAILURE ();
return;
}
switch (do_p->do_type)
{
case DO_FIXED:
case DO_CMP_READ:
case DO_PROC_READ:
GPG_SECURITY_FAILURE ();
break;
case DO_VAR:
{
const uint8_t **do_data_p = (const uint8_t **)do_p->obj;
if (*do_data_p)
flash_do_release (*do_data_p);
if (len == 0)
{
/* make DO empty */
*do_data_p = NULL;
GPG_SUCCESS ();
}
else if (len > 255)
GPG_MEMORY_FAILURE ();
else
{
int nr = do_tag_to_nr (tag);
if (nr < 0)
GPG_MEMORY_FAILURE ();
else
{
*do_data_p = NULL;
*do_data_p = flash_do_write (nr, data, len);
if (*do_data_p)
GPG_SUCCESS ();
else
GPG_MEMORY_FAILURE ();
}
}
break;
}
case DO_PROC_READWRITE:
{
int (*rw_func)(uint16_t, int, const uint8_t *, int, int)
= (int (*)(uint16_t, int, const uint8_t *, int, int))do_p->obj;
if (rw_func (tag, 0, data, len, 1))
GPG_SUCCESS ();
else
GPG_ERROR ();
break;
}
case DO_PROC_WRITE:
{
int (*proc_func)(const uint8_t *, int)
= (int (*)(const uint8_t *, int))do_p->obj;
if (proc_func (data, len))
GPG_SUCCESS ();
else
GPG_ERROR ();
break;
}
}
}
else
GPG_NO_RECORD ();
}
void
gpg_do_public_key (uint8_t kk_byte)
{
enum kind_of_key kk = kkb_to_kk (kk_byte);
int attr = gpg_get_algo_attr (kk);
int pubkey_len = gpg_get_algo_attr_key_size (kk, GPG_KEY_PUBLIC);
const uint8_t *pubkey = kd[kk].pubkey;
DEBUG_INFO ("Public key\r\n");
DEBUG_BYTE (kk_byte);
if (pubkey == NULL)
{
DEBUG_INFO ("none.\r\n");
GPG_NO_RECORD ();
return;
}
res_p = res_APDU;
/* TAG */
*res_p++ = 0x7f; *res_p++ = 0x49;
if (attr == ALGO_SECP256K1)
{ /* ECDSA or ECDH */
/* LEN */
*res_p++ = 2 + 1 + 64;
{
/*TAG*/ /* LEN = 1+64 */
*res_p++ = 0x86; *res_p++ = 0x41;
*res_p++ = 0x04; /* No compression of EC point. */
/* 64-byte binary (big endian): X || Y */
memcpy (res_p, pubkey, 64);
res_p += 64;
}
}
else if (attr == ALGO_ED25519 || attr == ALGO_CURVE25519)
{ /* EdDSA or ECDH on curve25519 */
/* LEN */
*res_p++ = 2 + 32;
{
/*TAG*/ /* LEN = 32 */
*res_p++ = 0x86; *res_p++ = 0x20;
/* 32-byte binary (little endian): Y with parity or X */
memcpy (res_p, pubkey, 32);
res_p += 32;
}
}
else if (attr == ALGO_ED448)
{ /* EdDSA using Ed448 */
/* LEN */
*res_p++ = 2 + 57;
{
/*TAG*/ /* LEN = 57 */
*res_p++ = 0x86; *res_p++ = 0x39;
/* 57-byte binary (little endian): X */
memcpy (res_p, pubkey, 57);
res_p += 57;
}
}
else if (attr == ALGO_X448)
{ /* ECDH using X448 */
/* LEN */
*res_p++ = 2 + 56;
{
/*TAG*/ /* LEN = 56 */
*res_p++ = 0x86; *res_p++ = 0x38;
/* 56-byte binary (little endian): X */
memcpy (res_p, pubkey, 56);
res_p += 56;
}
}
else
{ /* RSA */
/* LEN = 9+256or512 */
*res_p++ = 0x82; *res_p++ = pubkey_len > 256? 0x02: 0x01; *res_p++ = 0x09;
{
/*TAG*/ /* LEN = 256or512 */
*res_p++ = 0x81;
*res_p++ = 0x82; *res_p++ = pubkey_len > 256? 0x02: 0x01;*res_p++ = 0x00;
/* PUBKEY_LEN-byte binary (big endian) */
memcpy (res_p, pubkey, pubkey_len);
res_p += pubkey_len;
}
{
/*TAG*/ /* LEN= 3 */
*res_p++ = 0x82; *res_p++ = 3;
/* 3-byte E=0x10001 (big endian) */
*res_p++ = 0x01; *res_p++ = 0x00; *res_p++ = 0x01;
}
}
/* Success */
res_APDU_size = res_p - res_APDU;
GPG_SUCCESS ();
DEBUG_INFO ("done.\r\n");
return;
}
const uint8_t *
gpg_do_read_simple (uint8_t nr)
{
const uint8_t *do_data;
do_data = do_ptr[nr];
if (do_data == NULL)
return NULL;
return do_data+1;
}
void
gpg_do_write_simple (uint8_t nr, const uint8_t *data, int size)
{
const uint8_t **do_data_p;
do_data_p = (const uint8_t **)&do_ptr[nr];
if (*do_data_p)
flash_do_release (*do_data_p);
if (data != NULL)
{
*do_data_p = NULL;
*do_data_p = flash_do_write (nr, data, size);
if (*do_data_p == NULL)
flash_warning ("DO WRITE ERROR");
}
else
*do_data_p = NULL;
}
#include "hsm2040.h"
#include "tusb.h"
void
gpg_do_keygen (uint8_t *buf)
{
uint8_t kk_byte = buf[0];
enum kind_of_key kk = kkb_to_kk (kk_byte);
int attr = gpg_get_algo_attr (kk);;
int prvkey_len = gpg_get_algo_attr_key_size (kk, GPG_KEY_PRIVATE);
const uint8_t *prv;
const uint8_t *rnd;
int r = 0;
#define p_q (&buf[3])
#define d (&buf[3])
#define d1 (&buf[3+64])
#define pubkey (&buf[3+256])
DEBUG_INFO ("Keygen\r\n");
DEBUG_BYTE (kk_byte);
if (attr == ALGO_RSA2K || attr == ALGO_RSA4K)
{
if (rsa_genkey (prvkey_len, pubkey, p_q) < 0)
{
GPG_MEMORY_FAILURE ();
return;
}
prv = p_q;
}
else if (attr == ALGO_SECP256K1)
{
const uint8_t *p;
int i;
rnd = NULL;
do
{
if (rnd)
random_bytes_free (rnd);
rnd = random_bytes_get ();
r = ecc_check_secret_p256k1 (rnd, d1);
}
while (r == 0);
/* Convert it to big endian */
if (r < 0)
p = (const uint8_t *)d1;
else
p = rnd;
for (i = 0; i < 32; i++)
d[32 - i - 1] = p[i];
random_bytes_free (rnd);
prv = d;
r = ecc_compute_public_p256k1 (prv, pubkey);
}
else if (attr == ALGO_CURVE25519)
{
rnd = random_bytes_get ();
memcpy (d, rnd, 32);
random_bytes_free (rnd);
d[0] &= 248;
d[31] &= 127;
d[31] |= 64;
prv = d;
ecdh_compute_public_25519 (prv, pubkey);
}
else if (attr == ALGO_ED25519)
{
rnd = random_bytes_get ();
mbedtls_sha512_context ctx;
mbedtls_sha512_init(&ctx);
mbedtls_sha512_starts (&ctx, 0);
mbedtls_sha512_update (&ctx, rnd, 32);
mbedtls_sha512_finish (&ctx, d);
mbedtls_sha512_free (&ctx);
random_bytes_free (rnd);
d[0] &= 248;
d[31] &= 127;
d[31] |= 64;
prv = d;
eddsa_compute_public_25519 (d, pubkey);
}
else if (attr == ALGO_ED448)
{
shake_context ctx;
rnd = random_bytes_get ();
shake256_start (&ctx);
shake256_update (&ctx, rnd, 32);
random_bytes_free (rnd);
rnd = random_bytes_get ();
shake256_update (&ctx, rnd, 25);
shake256_finish (&ctx, d, 2*57);
random_bytes_free (rnd);
prv = d;
ed448_compute_public (pubkey, prv);
pubkey[57] = 0;
}
else if (attr == ALGO_X448)
{
rnd = random_bytes_get ();
memcpy (d, rnd, 32);
random_bytes_free (rnd);
rnd = random_bytes_get ();
memcpy (d+32, rnd, 24);
prv = d;
ecdh_compute_public_x448 (pubkey, prv);
}
else
{
GPG_CONDITION_NOT_SATISFIED ();
return;
}
if (r >= 0)
{
const uint8_t *keystring_admin;
if (admin_authorized == BY_ADMIN)
keystring_admin = keystring_md_pw3;
else
keystring_admin = NULL;
r = gpg_do_write_prvkey (kk, prv, prvkey_len, keystring_admin, pubkey);
}
/* Clear private key data in the buffer. */
memset (buf, 0, 256);
if (r < 0)
{
GPG_ERROR ();
return;
}
DEBUG_INFO ("Calling gpg_do_public_key...\r\n");
if (kk == GPG_KEY_FOR_SIGNING)
{
int pw_len;
const uint8_t *initial_pw;
uint8_t keystring[KEYSTRING_MD_SIZE];
/* GnuPG expects it's ready for signing. */
/* Don't call ac_reset_pso_cds here, but load the private key */
gpg_reset_digital_signature_counter ();
gpg_do_get_initial_pw_setting (0, &pw_len, &initial_pw);
s2k (NULL, 0, initial_pw, pw_len, keystring);
gpg_do_load_prvkey (GPG_KEY_FOR_SIGNING, BY_USER, keystring);
}
else
ac_reset_other ();
gpg_do_public_key (kk_byte);
}
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