mirror of
https://github.com/polhenarejos/pico-hsm.git
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98 lines
3.1 KiB
C
98 lines
3.1 KiB
C
/*
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* This file is part of the Pico HSM distribution (https://github.com/polhenarejos/pico-hsm).
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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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#include "sc_hsm.h"
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int cmd_read_binary() {
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uint16_t offset = 0;
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uint8_t ins = INS(apdu), p1 = P1(apdu), p2 = P2(apdu);
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const file_t *ef = NULL;
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if ((ins & 0x1) == 0) {
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if ((p1 & 0x80) != 0) {
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if (!(ef = search_file(p1 & 0x1f))) {
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return SW_FILE_NOT_FOUND();
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}
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offset = p2;
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}
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else {
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offset = make_uint16_t(p1, p2) & 0x7fff;
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ef = currentEF;
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}
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}
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else {
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if (p1 == 0 && (p2 & 0xE0) == 0 && (p2 & 0x1f) != 0 && (p2 & 0x1f) != 0x1f) {
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if (!(ef = search_file(p2 & 0x1f))) {
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return SW_FILE_NOT_FOUND();
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}
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}
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else {
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uint16_t file_id = make_uint16_t(p1, p2); // & 0x7fff;
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if (file_id == 0x0) {
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ef = currentEF;
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}
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else if (!(ef = search_file(file_id))) {
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return SW_FILE_NOT_FOUND();
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}
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if (apdu.data[0] != 0x54) {
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return SW_WRONG_DATA();
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}
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offset = 0;
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for (int d = 0; d < apdu.data[1]; d++) {
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offset |= apdu.data[2 + d] << (apdu.data[1] - 1 - d) * 8;
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}
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}
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}
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if ((ef->fid >> 8) == KEY_PREFIX || !authenticate_action(ef, ACL_OP_READ_SEARCH)) {
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return SW_SECURITY_STATUS_NOT_SATISFIED();
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}
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if (ef->data) {
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if ((ef->type & FILE_DATA_FUNC) == FILE_DATA_FUNC) {
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uint16_t data_len = (uint16_t)((int (*)(const file_t *, int))(ef->data))((const file_t *) ef, 1); //already copies content to res_APDU
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if (offset > data_len) {
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return SW_WRONG_P1P2();
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}
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uint16_t maxle = data_len - offset;
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if (apdu.ne > maxle) {
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apdu.ne = maxle;
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}
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if (offset) {
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memmove(res_APDU, res_APDU + offset, res_APDU_size - offset);
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//res_APDU += offset;
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res_APDU_size -= offset;
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}
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}
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else {
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uint16_t data_len = file_get_size(ef);
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if (offset > data_len) {
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return SW_WARNING_EOF();
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}
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//uint16_t maxle = data_len - offset;
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//if (apdu.ne > maxle) {
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// apdu.ne = maxle;
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//}
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memcpy(res_APDU, file_get_data(ef) + offset, data_len - offset);
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res_APDU_size = data_len - offset;
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}
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}
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return SW_OK();
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}
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