214 lines
7.5 KiB
C
214 lines
7.5 KiB
C
/*
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* This file is part of the Pico OpenPGP distribution (https://github.com/polhenarejos/pico-openpgp).
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* Copyright (c) 2022 Pol Henarejos.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef ESP_PLATFORM
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#include "esp_compat.h"
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#define MBEDTLS_ALLOW_PRIVATE_ACCESS
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#else
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#include "common.h"
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#endif
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#include "openpgp.h"
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#include "do.h"
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#include "random.h"
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#include "mbedtls/ecdh.h"
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#include "mbedtls/asn1.h"
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int cmd_pso() {
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uint16_t algo_fid = 0x0, pk_fid = 0x0;
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bool is_aes = false;
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if (P1(apdu) == 0x9E && P2(apdu) == 0x9A) {
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if (!has_pw3 && !has_pw1) {
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return SW_SECURITY_STATUS_NOT_SATISFIED();
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}
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algo_fid = EF_ALGO_PRIV1;
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pk_fid = EF_PK_SIG;
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}
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else if (P1(apdu) == 0x80 && P2(apdu) == 0x86) {
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if (!has_pw3 && !has_pw2) {
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return SW_SECURITY_STATUS_NOT_SATISFIED();
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}
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algo_fid = algo_dec;
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pk_fid = pk_dec;
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}
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else {
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return SW_INCORRECT_P1P2();
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}
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file_t *algo_ef = search_by_fid(algo_fid, NULL, SPECIFY_EF);
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if (!algo_ef) {
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return SW_REFERENCE_NOT_FOUND();
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}
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const uint8_t *algo = algorithm_attr_rsa2k + 1;
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if (algo_ef && algo_ef->data) {
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algo = file_get_data(algo_ef);
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}
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if (apdu.data[0] == 0x2) { //AES PSO?
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if (((apdu.nc - 1) % 16 == 0 && P1(apdu) == 0x80 && P2(apdu) == 0x86) ||
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(apdu.nc % 16 == 0 && P1(apdu) == 0x86 && P2(apdu) == 0x80)) {
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pk_fid = EF_AES_KEY;
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is_aes = true;
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}
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}
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file_t *ef = search_by_fid(pk_fid, NULL, SPECIFY_EF);
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if (!ef) {
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return SW_REFERENCE_NOT_FOUND();
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}
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if (wait_button_pressed_fid(pk_fid == EF_PK_SIG ? EF_UIF_SIG : EF_UIF_DEC) == true) {
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return SW_SECURE_MESSAGE_EXEC_ERROR();
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}
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int r = PICOKEY_OK;
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int key_size = file_get_size(ef);
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if (is_aes) {
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uint8_t aes_key[32];
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r = load_aes_key(aes_key, ef);
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if (r != PICOKEY_OK) {
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memset(aes_key, 0, sizeof(aes_key));
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return SW_EXEC_ERROR();
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}
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if (P1(apdu) == 0x80 && P2(apdu) == 0x86) { //decipher
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r = aes_decrypt(aes_key, NULL, key_size, PICO_KEYS_AES_MODE_CBC, apdu.data + 1, apdu.nc - 1);
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memset(aes_key, 0, sizeof(aes_key));
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if (r != PICOKEY_OK) {
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return SW_EXEC_ERROR();
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}
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memcpy(res_APDU, apdu.data + 1, apdu.nc - 1);
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res_APDU_size = apdu.nc - 1;
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}
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else if (P1(apdu) == 0x86 && P2(apdu) == 0x80) { //encipher
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r = aes_encrypt(aes_key, NULL, key_size, PICO_KEYS_AES_MODE_CBC, apdu.data, apdu.nc);
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memset(aes_key, 0, sizeof(aes_key));
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if (r != PICOKEY_OK) {
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return SW_EXEC_ERROR();
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}
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res_APDU[0] = 0x2;
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memcpy(res_APDU + 1, apdu.data, apdu.nc);
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res_APDU_size = apdu.nc + 1;
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}
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return SW_OK();
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}
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if (algo[0] == ALGO_RSA) {
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mbedtls_rsa_context ctx;
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mbedtls_rsa_init(&ctx);
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r = load_private_key_rsa(&ctx, ef, true);
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if (r != PICOKEY_OK) {
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mbedtls_rsa_free(&ctx);
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return SW_EXEC_ERROR();
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}
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if (P1(apdu) == 0x9E && P2(apdu) == 0x9A) {
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size_t olen = 0;
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r = rsa_sign(&ctx, apdu.data, apdu.nc, res_APDU, &olen);
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mbedtls_rsa_free(&ctx);
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if (r != 0) {
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return SW_EXEC_ERROR();
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}
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res_APDU_size = olen;
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//apdu.ne = key_size;
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inc_sig_count();
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}
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else if (P1(apdu) == 0x80 && P2(apdu) == 0x86) {
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if (apdu.nc < key_size) { //needs padding
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memset(apdu.data + apdu.nc, 0, key_size - apdu.nc);
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}
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size_t olen = 0;
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r = mbedtls_rsa_pkcs1_decrypt(&ctx,
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random_gen,
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NULL,
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&olen,
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apdu.data + 1,
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res_APDU,
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key_size);
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mbedtls_rsa_free(&ctx);
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if (r != 0) {
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return SW_EXEC_ERROR();
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}
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res_APDU_size = olen;
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}
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}
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else if (algo[0] == ALGO_ECDH || algo[0] == ALGO_ECDSA || algo[0] == ALGO_EDDSA) {
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if (P1(apdu) == 0x9E && P2(apdu) == 0x9A) {
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mbedtls_ecp_keypair ctx;
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mbedtls_ecp_keypair_init(&ctx);
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r = load_private_key_ecdsa(&ctx, ef, true);
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if (r != PICOKEY_OK) {
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mbedtls_ecp_keypair_free(&ctx);
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return SW_EXEC_ERROR();
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}
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size_t olen = 0;
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r = ecdsa_sign(&ctx, apdu.data, apdu.nc, res_APDU, &olen);
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mbedtls_ecp_keypair_free(&ctx);
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if (r != 0) {
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return SW_EXEC_ERROR();
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}
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res_APDU_size = olen;
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inc_sig_count();
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}
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else if (P1(apdu) == 0x80 && P2(apdu) == 0x86) {
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mbedtls_ecdh_context ctx;
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uint8_t kdata[67];
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uint8_t *data = apdu.data, *end = data + apdu.nc;
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size_t len = 0;
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if (mbedtls_asn1_get_tag(&data, end, &len, 0xA6) != 0) {
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return SW_WRONG_DATA();
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}
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if (*data++ != 0x7f) {
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return SW_WRONG_DATA();
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}
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if (mbedtls_asn1_get_tag(&data, end, &len,
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0x49) != 0 ||
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mbedtls_asn1_get_tag(&data, end, &len, 0x86) != 0) {
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return SW_WRONG_DATA();
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}
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//if (len != 2*key_size-1)
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// return SW_WRONG_LENGTH();
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memcpy(kdata, file_get_data(ef), key_size);
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if (dek_decrypt(kdata, key_size) != 0) {
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return SW_EXEC_ERROR();
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}
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mbedtls_ecdh_init(&ctx);
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mbedtls_ecp_group_id gid = kdata[0];
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r = mbedtls_ecdh_setup(&ctx, gid);
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if (r != 0) {
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mbedtls_ecdh_free(&ctx);
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return SW_DATA_INVALID();
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}
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r = mbedtls_ecp_read_key(gid, (mbedtls_ecdsa_context *)&ctx.ctx.mbed_ecdh, kdata + 1, key_size - 1);
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if (r != 0) {
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mbedtls_ecdh_free(&ctx);
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return SW_DATA_INVALID();
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}
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r = mbedtls_ecdh_read_public(&ctx, data - 1, len + 1);
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if (r != 0) {
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mbedtls_ecdh_free(&ctx);
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return SW_DATA_INVALID();
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}
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size_t olen = 0;
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r = mbedtls_ecdh_calc_secret(&ctx,
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&olen,
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res_APDU,
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MBEDTLS_ECP_MAX_BYTES,
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random_gen,
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NULL);
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if (r != 0) {
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mbedtls_ecdh_free(&ctx);
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return SW_EXEC_ERROR();
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}
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res_APDU_size = olen;
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mbedtls_ecdh_free(&ctx);
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}
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}
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return SW_OK();
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}
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