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Replaced system SQLite with SQLCipher to support encrypted database

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This commit is contained in:
Oleksii Zghurskyi
2025-06-07 18:11:17 +03:00
parent f4198d62a7
commit 177d74700f
534 changed files with 362771 additions and 21 deletions
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63
Sources/DataLiteC/libtomcrypt/pk/ecc/ltc_ecc_map.c Normal file
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
/* SPDX-License-Identifier: Unlicense */
#include "tomcrypt_private.h"
/**
@file ltc_ecc_map.c
ECC Crypto, Tom St Denis
*/
#ifdef LTC_MECC
/**
Map a projective jacbobian point back to affine space
@param P [in/out] The point to map
@param modulus The modulus of the field the ECC curve is in
@param mp The "b" value from montgomery_setup()
@return CRYPT_OK on success
*/
int ltc_ecc_map(ecc_point *P, const void *modulus, void *mp)
{
void *t1, *t2;
int err;
LTC_ARGCHK(P != NULL);
LTC_ARGCHK(modulus != NULL);
LTC_ARGCHK(mp != NULL);
if (ltc_mp_iszero(P->z)) {
return ltc_ecc_set_point_xyz(0, 0, 1, P);
}
if ((err = ltc_mp_init_multi(&t1, &t2, LTC_NULL)) != CRYPT_OK) {
return err;
}
/* first map z back to normal */
if ((err = ltc_mp_montgomery_reduce(P->z, modulus, mp)) != CRYPT_OK) { goto done; }
/* get 1/z */
if ((err = ltc_mp_invmod(P->z, modulus, t1)) != CRYPT_OK) { goto done; }
/* get 1/z^2 and 1/z^3 */
if ((err = ltc_mp_sqr(t1, t2)) != CRYPT_OK) { goto done; }
if ((err = ltc_mp_mod(t2, modulus, t2)) != CRYPT_OK) { goto done; }
if ((err = ltc_mp_mul(t1, t2, t1)) != CRYPT_OK) { goto done; }
if ((err = ltc_mp_mod(t1, modulus, t1)) != CRYPT_OK) { goto done; }
/* multiply against x/y */
if ((err = ltc_mp_mul(P->x, t2, P->x)) != CRYPT_OK) { goto done; }
if ((err = ltc_mp_montgomery_reduce(P->x, modulus, mp)) != CRYPT_OK) { goto done; }
if ((err = ltc_mp_mul(P->y, t1, P->y)) != CRYPT_OK) { goto done; }
if ((err = ltc_mp_montgomery_reduce(P->y, modulus, mp)) != CRYPT_OK) { goto done; }
if ((err = ltc_mp_set(P->z, 1)) != CRYPT_OK) { goto done; }
err = CRYPT_OK;
done:
ltc_mp_deinit_multi(t1, t2, LTC_NULL);
return err;
}
#endif