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53 lines
1.8 KiB
53 lines
1.8 KiB
/* |
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* Copyright 2018 The OpenSSL Project Authors. All Rights Reserved. |
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* |
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* Licensed under the OpenSSL license (the "License"). You may not use |
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* this file except in compliance with the License. You can obtain a copy |
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* in the file LICENSE in the source distribution or at |
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* https://www.openssl.org/source/license.html |
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*/ |
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/* Internal EC functions for other submodules: not for application use */ |
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#ifndef OSSL_CRYPTO_EC_H |
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# define OSSL_CRYPTO_EC_H |
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# include <openssl/opensslconf.h> |
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# ifndef OPENSSL_NO_EC |
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# include <openssl/ec.h> |
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/*- |
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* Computes the multiplicative inverse of x in the range |
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* [1,EC_GROUP::order), where EC_GROUP::order is the cardinality of the |
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* subgroup generated by the generator G: |
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* |
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* res := x^(-1) (mod EC_GROUP::order). |
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* |
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* This function expects the following two conditions to hold: |
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* - the EC_GROUP order is prime, and |
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* - x is included in the range [1, EC_GROUP::order). |
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* |
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* This function returns 1 on success, 0 on error. |
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* |
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* If the EC_GROUP order is even, this function explicitly returns 0 as |
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* an error. |
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* In case any of the two conditions stated above is not satisfied, |
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* the correctness of its output is not guaranteed, even if the return |
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* value could still be 1 (as primality testing and a conditional modular |
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* reduction round on the input can be omitted by the underlying |
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* implementations for better SCA properties on regular input values). |
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*/ |
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__owur int ec_group_do_inverse_ord(const EC_GROUP *group, BIGNUM *res, |
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const BIGNUM *x, BN_CTX *ctx); |
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/*- |
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* ECDH Key Derivation Function as defined in ANSI X9.63 |
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*/ |
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int ecdh_KDF_X9_63(unsigned char *out, size_t outlen, |
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const unsigned char *Z, size_t Zlen, |
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const unsigned char *sinfo, size_t sinfolen, |
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const EVP_MD *md); |
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# endif /* OPENSSL_NO_EC */ |
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#endif
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