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/* gmp-glue.h
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Copyright (C) 2013 Niels Möller
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Copyright (C) 2013 Red Hat
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This file is part of GNU Nettle.
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GNU Nettle is free software: you can redistribute it and/or
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modify it under the terms of either:
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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or both in parallel, as here.
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GNU Nettle 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 GNU
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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see http://www.gnu.org/licenses/.
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*/
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#ifndef GNUTLS_LIB_NETTLE_ECC_NETTLE_GMP_GLUE_H_INCLUDED
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#define GNUTLS_LIB_NETTLE_ECC_NETTLE_GMP_GLUE_H_INCLUDED
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#include <nettle/bignum.h>
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#define cnd_swap _gnutls_nettle_ecc_cnd_swap
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#define mpz_limbs_cmp _gnutls_nettle_ecc_mpz_limbs_cmp
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#define mpz_limbs_read_n _gnutls_nettle_ecc_mpz_limbs_read_n
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#define mpz_limbs_copy _gnutls_nettle_ecc_mpz_limbs_copy
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#define mpz_set_n _gnutls_nettle_ecc_mpz_set_n
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#define mpn_set_base256 _gnutls_nettle_ecc_mpn_set_base256
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#define mpn_set_base256_le _gnutls_nettle_ecc_mpn_set_base256_le
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#define mpn_get_base256 _gnutls_nettle_ecc_mpn_get_base256
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#define mpn_get_base256_le _gnutls_nettle_ecc_mpn_get_base256_le
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#define gmp_alloc_limbs _gnutls_nettle_ecc_gmp_alloc_limbs
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#define gmp_free_limbs _gnutls_nettle_ecc_gmp_free_limbs
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#define gmp_free _gnutls_nettle_ecc_gmp_free
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#define gmp_alloc _gnutls_nettle_ecc_gmp_alloc
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#define TMP_GMP_DECL(name, type) type *name; \
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size_t tmp_##name##_size
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#define TMP_GMP_ALLOC(name, size) do { \
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tmp_##name##_size = (size); \
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(name) = gmp_alloc(sizeof (*name) * (size)); \
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} while (0)
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#define TMP_GMP_FREE(name) (gmp_free(name, tmp_##name##_size))
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/* Use only in-place operations, so we can fall back to addmul_1/submul_1 */
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#ifdef mpn_cnd_add_n
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# define cnd_add_n(cnd, rp, ap, n) mpn_cnd_add_n ((cnd), (rp), (rp), (ap), (n))
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# define cnd_sub_n(cnd, rp, ap, n) mpn_cnd_sub_n ((cnd), (rp), (rp), (ap), (n))
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#else
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# define cnd_add_n(cnd, rp, ap, n) mpn_addmul_1 ((rp), (ap), (n), (cnd) != 0)
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# define cnd_sub_n(cnd, rp, ap, n) mpn_submul_1 ((rp), (ap), (n), (cnd) != 0)
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#endif
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#define NETTLE_OCTET_SIZE_TO_LIMB_SIZE(n) \
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(((n) * 8 + GMP_NUMB_BITS - 1) / GMP_NUMB_BITS)
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void
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cnd_swap (mp_limb_t cnd, mp_limb_t *ap, mp_limb_t *bp, mp_size_t n);
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/* Convenience functions */
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int
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mpz_limbs_cmp (mpz_srcptr a, const mp_limb_t *bp, mp_size_t bn);
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/* Get a pointer to an n limb area, for read-only operation. n must be
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greater or equal to the current size, and the mpz is zero-padded if
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needed. */
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const mp_limb_t *
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mpz_limbs_read_n (mpz_ptr x, mp_size_t n);
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/* Copy limbs, with zero-padding. */
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/* FIXME: Reorder arguments, on the theory that the first argument of
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an _mpz_* function should be an mpz_t? Or rename to _mpz_get_limbs,
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with argument order consistent with mpz_get_*. */
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void
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mpz_limbs_copy (mp_limb_t *xp, mpz_srcptr x, mp_size_t n);
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void
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mpz_set_n (mpz_t r, const mp_limb_t *xp, mp_size_t xn);
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/* Like mpn_set_str, but always writes rn limbs. If input is larger,
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higher bits are ignored. */
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void
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mpn_set_base256 (mp_limb_t *rp, mp_size_t rn,
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const uint8_t *xp, size_t xn);
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void
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mpn_set_base256_le (mp_limb_t *rp, mp_size_t rn,
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const uint8_t *xp, size_t xn);
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void
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mpn_get_base256 (uint8_t *rp, size_t rn,
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const mp_limb_t *xp, mp_size_t xn);
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void
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mpn_get_base256_le (uint8_t *rp, size_t rn,
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const mp_limb_t *xp, mp_size_t xn);
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mp_limb_t *
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gmp_alloc_limbs (mp_size_t n);
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void
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gmp_free_limbs (mp_limb_t *p, mp_size_t n);
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void *gmp_alloc(size_t n);
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void gmp_free(void *p, size_t n);
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#endif /* GNUTLS_LIB_NETTLE_ECC_NETTLE_GMP_GLUE_H_INCLUDED */
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