59 lines
1.8 KiB
C
59 lines
1.8 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 "crypto_utils.h"
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#include "sc_hsm.h"
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#include "random.h"
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int cmd_key_gen()
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{
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uint8_t key_id = P1(apdu);
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uint8_t p2 = P2(apdu);
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uint8_t key_size = 32;
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int r;
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if (!isUserAuthenticated) {
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return SW_SECURITY_STATUS_NOT_SATISFIED();
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}
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if (p2 == 0xB2) {
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key_size = 32;
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} else if (p2 == 0xB1) {
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key_size = 24;
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} else if (p2 == 0xB0) {
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key_size = 16;
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}
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//at this moment, we do not use the template, as only CBC is supported by the driver (encrypt, decrypt and CMAC)
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uint8_t aes_key[32]; //maximum AES key size
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memcpy(aes_key, random_bytes_get(key_size), key_size);
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int aes_type = 0x0;
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if (key_size == 16) {
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aes_type = HSM_KEY_AES_128;
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} else if (key_size == 24) {
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aes_type = HSM_KEY_AES_192;
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} else if (key_size == 32) {
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aes_type = HSM_KEY_AES_256;
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}
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r = store_keys(aes_key, aes_type, key_id);
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if (r != CCID_OK) {
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return SW_MEMORY_FAILURE();
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}
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if (find_and_store_meta_key(key_id) != CCID_OK) {
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return SW_EXEC_ERROR();
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}
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low_flash_available();
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return SW_OK();
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}
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