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70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
/* openpgp-misc.c - miscellaneous functions for OpenPGP
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* Copyright (C) 2021 g10 Code GmbH
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*
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* This file is part of GnuPG.
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*
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* GnuPG 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; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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 <https://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <stdlib.h>
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#include "util.h"
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#include "openpgpdefs.h"
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gcry_mpi_t
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openpgp_ecc_parse_pubkey (pubkey_algo_t pkalgo, const char *curve,
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gcry_mpi_t pubkey)
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{
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unsigned int nbits = 0;
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unsigned char *buf = NULL;
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if ((pkalgo == PUBKEY_ALGO_EDDSA && !strcmp (curve, "Ed448"))
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|| (pkalgo == PUBKEY_ALGO_ECDH && !strcmp (curve, "X448")))
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buf = gcry_mpi_get_opaque (pubkey, &nbits);
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if (nbits == 0
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|| (pkalgo == PUBKEY_ALGO_EDDSA && (nbits+7)/8 == (448 + 8)/8)
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|| (pkalgo == PUBKEY_ALGO_ECDH && (nbits+7)/8 == 448/8))
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return gcry_mpi_copy (pubkey);
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if (pkalgo == PUBKEY_ALGO_EDDSA)
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return gcry_mpi_set_opaque_copy (NULL, buf+1, 8 + 448);
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else
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return gcry_mpi_set_opaque_copy (NULL, buf+1, 448);
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}
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gcry_mpi_t
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openpgp_ecc_parse_seckey (pubkey_algo_t pkalgo, const char *curve,
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gcry_mpi_t seckey)
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{
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unsigned int nbits = 0;
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unsigned char *buf = NULL;
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if ((pkalgo == PUBKEY_ALGO_EDDSA && !strcmp (curve, "Ed448"))
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|| (pkalgo == PUBKEY_ALGO_ECDH && !strcmp (curve, "X448")))
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buf = gcry_mpi_get_opaque (seckey, &nbits);
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if (nbits == 0
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|| (pkalgo == PUBKEY_ALGO_EDDSA && (nbits+7)/8 == (448 + 8)/8)
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|| (pkalgo == PUBKEY_ALGO_ECDH && (nbits+7)/8 == 448/8))
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return gcry_mpi_copy (seckey);
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if (pkalgo == PUBKEY_ALGO_EDDSA)
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return gcry_mpi_set_opaque_copy (NULL, buf+1, 8 + 448);
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else
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return gcry_mpi_set_opaque_copy (NULL, buf+1, 448);
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}
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