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/*
* Copyright 2018-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
/* Internal EC functions for other submodules: not for application use */
#ifndef OSSL_CRYPTO_EC_H
# define OSSL_CRYPTO_EC_H
# include <openssl/opensslconf.h>
# ifndef OPENSSL_NO_EC
# include <openssl/core.h>
# include <openssl/ec.h>
/*-
* Computes the multiplicative inverse of x in the range
* [1,EC_GROUP::order), where EC_GROUP::order is the cardinality of the
* subgroup generated by the generator G:
*
* res := x^(-1) (mod EC_GROUP::order).
*
* This function expects the following two conditions to hold:
* - the EC_GROUP order is prime, and
* - x is included in the range [1, EC_GROUP::order).
*
* This function returns 1 on success, 0 on error.
*
* If the EC_GROUP order is even, this function explicitly returns 0 as
* an error.
* In case any of the two conditions stated above is not satisfied,
* the correctness of its output is not guaranteed, even if the return
* value could still be 1 (as primality testing and a conditional modular
* reduction round on the input can be omitted by the underlying
* implementations for better SCA properties on regular input values).
*/
__owur int ec_group_do_inverse_ord(const EC_GROUP *group, BIGNUM *res,
const BIGNUM *x, BN_CTX *ctx);
/*-
* ECDH Key Derivation Function as defined in ANSI X9.63
*/
int ecdh_KDF_X9_63(unsigned char *out, size_t outlen,
const unsigned char *Z, size_t Zlen,
const unsigned char *sinfo, size_t sinfolen,
const EVP_MD *md, OPENSSL_CTX *libctx, const char *propq);
int ec_generate_key(OPENSSL_CTX *libctx, EC_KEY *eckey, int pairwise_test);
int ec_key_public_check(const EC_KEY *eckey, BN_CTX *ctx);
int ec_key_private_check(const EC_KEY *eckey);
int ec_key_pairwise_check(const EC_KEY *eckey, BN_CTX *ctx);
OPENSSL_CTX *ec_key_get_libctx(const EC_KEY *eckey);
const char *ec_key_get0_propq(const EC_KEY *eckey);
const char *ec_curve_nid2name(int nid);
int ec_curve_name2nid(const char *name);
/* Backend support */
int ec_group_todata(const EC_GROUP *group, OSSL_PARAM_BLD *tmpl,
OSSL_PARAM params[], OPENSSL_CTX *libctx, const char *propq,
BN_CTX *bnctx, unsigned char **genbuf);
int ec_group_fromdata(EC_KEY *ec, const OSSL_PARAM params[]);
int ec_key_fromdata(EC_KEY *ecx, const OSSL_PARAM params[], int include_private);
int ec_key_otherparams_fromdata(EC_KEY *ec, const OSSL_PARAM params[]);
int ec_set_ecdh_cofactor_mode(EC_KEY *ec, int mode);
int ec_encoding_name2id(const char *name);
# endif /* OPENSSL_NO_EC */
#endif
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