include/crypto/ec.h

   1 /*
   2  * Copyright 2018-2021 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 /* Internal EC functions for other submodules: not for application use */
  11
  12 #ifndef OSSL_CRYPTO_EC_H
  13 # define OSSL_CRYPTO_EC_H
  14 # pragma once
  15
  16 # include <openssl/opensslconf.h>
  17 # include <openssl/evp.h>
  18
  19 const char *ossl_ec_curve_nid2name(int nid);
  20 int ossl_ec_curve_name2nid(const char *name);
  21 const char *ossl_ec_curve_nid2nist_int(int nid);
  22 int ossl_ec_curve_nist2nid_int(const char *name);
  23 int evp_pkey_ctx_set_ec_param_enc_prov(EVP_PKEY_CTX *ctx, int param_enc);
  24
  25 # ifndef OPENSSL_NO_EC
  26 #  include <openssl/core.h>
  27 #  include <openssl/ec.h>
  28 #  include <openssl/x509.h>
  29 #  include "crypto/types.h"
  30
  31 /*-
  32  * Computes the multiplicative inverse of x in the range
  33  * [1,EC_GROUP::order), where EC_GROUP::order is the cardinality of the
  34  * subgroup generated by the generator G:
  35  *
  36  *         res := x^(-1) (mod EC_GROUP::order).
  37  *
  38  * This function expects the following two conditions to hold:
  39  *  - the EC_GROUP order is prime, and
  40  *  - x is included in the range [1, EC_GROUP::order).
  41  *
  42  * This function returns 1 on success, 0 on error.
  43  *
  44  * If the EC_GROUP order is even, this function explicitly returns 0 as
  45  * an error.
  46  * In case any of the two conditions stated above is not satisfied,
  47  * the correctness of its output is not guaranteed, even if the return
  48  * value could still be 1 (as primality testing and a conditional modular
  49  * reduction round on the input can be omitted by the underlying
  50  * implementations for better SCA properties on regular input values).
  51  */
  52 __owur int ossl_ec_group_do_inverse_ord(const EC_GROUP *group, BIGNUM *res,
  53                                         const BIGNUM *x, BN_CTX *ctx);
  54
  55 /*-
  56  * ECDH Key Derivation Function as defined in ANSI X9.63
  57  */
  58 int ossl_ecdh_kdf_X9_63(unsigned char *out, size_t outlen,
  59                         const unsigned char *Z, size_t Zlen,
  60                         const unsigned char *sinfo, size_t sinfolen,
  61                         const EVP_MD *md, OSSL_LIB_CTX *libctx,
  62                         const char *propq);
  63
  64 int ossl_ec_key_public_check(const EC_KEY *eckey, BN_CTX *ctx);
  65 int ossl_ec_key_public_check_quick(const EC_KEY *eckey, BN_CTX *ctx);
  66 int ossl_ec_key_private_check(const EC_KEY *eckey);
  67 int ossl_ec_key_pairwise_check(const EC_KEY *eckey, BN_CTX *ctx);
  68 OSSL_LIB_CTX *ossl_ec_key_get_libctx(const EC_KEY *eckey);
  69 const char *ossl_ec_key_get0_propq(const EC_KEY *eckey);
  70 void ossl_ec_key_set0_libctx(EC_KEY *key, OSSL_LIB_CTX *libctx);
  71
  72 /* Backend support */
  73 int ossl_ec_group_todata(const EC_GROUP *group, OSSL_PARAM_BLD *tmpl,
  74                          OSSL_PARAM params[], OSSL_LIB_CTX *libctx,
  75                          const char *propq,
  76                          BN_CTX *bnctx, unsigned char **genbuf);
  77 int ossl_ec_group_fromdata(EC_KEY *ec, const OSSL_PARAM params[]);
  78 int ossl_ec_group_set_params(EC_GROUP *group, const OSSL_PARAM params[]);
  79 int ossl_ec_key_fromdata(EC_KEY *ecx, const OSSL_PARAM params[],
  80                          int include_private);
  81 int ossl_ec_key_otherparams_fromdata(EC_KEY *ec, const OSSL_PARAM params[]);
  82 EC_KEY *ossl_ec_key_param_from_x509_algor(const X509_ALGOR *palg,
  83                                           OSSL_LIB_CTX *libctx,
  84                                           const char *propq);
  85 EC_KEY *ossl_ec_key_from_pkcs8(const PKCS8_PRIV_KEY_INFO *p8inf,
  86                                OSSL_LIB_CTX *libctx, const char *propq);
  87
  88 int ossl_ec_set_ecdh_cofactor_mode(EC_KEY *ec, int mode);
  89 int ossl_ec_encoding_name2id(const char *name);
  90 int ossl_ec_encoding_param2id(const OSSL_PARAM *p, int *id);
  91 int ossl_ec_pt_format_name2id(const char *name);
  92 int ossl_ec_pt_format_param2id(const OSSL_PARAM *p, int *id);
  93 char *ossl_ec_pt_format_id2name(int id);
  94
  95 char *ossl_ec_check_group_type_id2name(int flags);
  96 int ossl_ec_set_check_group_type_from_name(EC_KEY *ec, const char *name);
  97
  98 # endif /* OPENSSL_NO_EC */
  99 #endif