Imported OpenSSL 1.1.1b
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@@ -1,5 +1,5 @@
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/*
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* Copyright 2002-2018 The OpenSSL Project Authors. All Rights Reserved.
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* Copyright 2002-2019 The OpenSSL Project Authors. All Rights Reserved.
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* Copyright (c) 2002, Oracle and/or its affiliates. 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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@@ -810,7 +810,7 @@ int ec_GF2m_simple_ladder_post(const EC_GROUP *group,
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|| !group->meth->field_mul(group, t2, t2, t0, ctx)
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|| !BN_GF2m_add(t1, t2, t1)
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|| !group->meth->field_mul(group, t2, p->X, t0, ctx)
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|| !BN_GF2m_mod_inv(t2, t2, group->field, ctx)
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|| !group->meth->field_inv(group, t2, t2, ctx)
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|| !group->meth->field_mul(group, t1, t1, t2, ctx)
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|| !group->meth->field_mul(group, r->X, r->Z, t2, ctx)
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|| !BN_GF2m_add(t2, p->X, r->X)
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@@ -889,6 +889,21 @@ int ec_GF2m_simple_points_mul(const EC_GROUP *group, EC_POINT *r,
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return ret;
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}
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/*-
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* Computes the multiplicative inverse of a in GF(2^m), storing the result in r.
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* If a is zero (or equivalent), you'll get a EC_R_CANNOT_INVERT error.
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* SCA hardening is with blinding: BN_GF2m_mod_inv does that.
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*/
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static int ec_GF2m_simple_field_inv(const EC_GROUP *group, BIGNUM *r,
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const BIGNUM *a, BN_CTX *ctx)
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{
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int ret;
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if (!(ret = BN_GF2m_mod_inv(r, a, group->field, ctx)))
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ECerr(EC_F_EC_GF2M_SIMPLE_FIELD_INV, EC_R_CANNOT_INVERT);
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return ret;
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}
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const EC_METHOD *EC_GF2m_simple_method(void)
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{
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static const EC_METHOD ret = {
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@@ -929,6 +944,7 @@ const EC_METHOD *EC_GF2m_simple_method(void)
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ec_GF2m_simple_field_mul,
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ec_GF2m_simple_field_sqr,
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ec_GF2m_simple_field_div,
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ec_GF2m_simple_field_inv,
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0, /* field_encode */
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0, /* field_decode */
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0, /* field_set_to_one */
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