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https://github.com/polhenarejos/pico-hsm.git
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54 lines
1.9 KiB
C
54 lines
1.9 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 "cvc.h"
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#include "files.h"
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extern file_t *ef_puk_aut;
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extern uint8_t challenge[256];
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extern uint8_t challenge_len;
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int cmd_external_authenticate() {
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if (P1(apdu) != 0x0 || P2(apdu) != 0x0)
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return SW_INCORRECT_P1P2();
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if (ef_puk_aut == NULL)
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return SW_REFERENCE_NOT_FOUND();
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if (apdu.nc == 0)
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return SW_WRONG_LENGTH();
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file_t *ef_puk = search_by_fid(EF_PUKAUT, NULL, SPECIFY_EF);
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if (!file_has_data(ef_puk))
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return SW_FILE_NOT_FOUND();
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uint8_t *puk_data = file_get_data(ef_puk);
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uint8_t *input = (uint8_t *)calloc(dev_name_len+challenge_len, sizeof(uint8_t)), hash[32];
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memcpy(input, dev_name, dev_name_len);
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memcpy(input+dev_name_len, challenge, challenge_len);
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hash256(input, dev_name_len+challenge_len, hash);
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int r = puk_verify(apdu.data, apdu.nc, hash, 32, file_get_data(ef_puk_aut), file_get_size(ef_puk_aut));
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free(input);
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if (r != 0)
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return SW_CONDITIONS_NOT_SATISFIED();
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puk_status[ef_puk_aut->fid & (MAX_PUK-1)] = 1;
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uint8_t auts = 0;
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for (int i = 0; i < puk_data[0]; i++)
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auts += puk_status[i];
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if (auts >= puk_data[2]) {
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isUserAuthenticated = true;
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}
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return SW_OK();
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}
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