Coverage Report

Created: 2024-11-21 07:03

/src/boringssl/crypto/ecdh_extra/ecdh_extra.c
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/* ====================================================================
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 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
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 *
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 * The Elliptic Curve Public-Key Crypto Library (ECC Code) included
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 * herein is developed by SUN MICROSYSTEMS, INC., and is contributed
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 * to the OpenSSL project.
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 *
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 * The ECC Code is licensed pursuant to the OpenSSL open source
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 * license provided below.
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 *
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 * The ECDH software is originally written by Douglas Stebila of
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 * Sun Microsystems Laboratories.
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 *
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 */
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/* ====================================================================
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 * Copyright (c) 2000-2002 The OpenSSL Project.  All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 *
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in
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 *    the documentation and/or other materials provided with the
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 *    distribution.
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 *
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 * 3. All advertising materials mentioning features or use of this
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 *    software must display the following acknowledgment:
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 *    "This product includes software developed by the OpenSSL Project
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 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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 *
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 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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 *    endorse or promote products derived from this software without
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 *    prior written permission. For written permission, please contact
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 *    licensing@OpenSSL.org.
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 *
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 * 5. Products derived from this software may not be called "OpenSSL"
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 *    nor may "OpenSSL" appear in their names without prior written
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 *    permission of the OpenSSL Project.
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 *
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 * 6. Redistributions of any form whatsoever must retain the following
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 *    acknowledgment:
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 *    "This product includes software developed by the OpenSSL Project
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 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
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 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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 * OF THE POSSIBILITY OF SUCH DAMAGE.
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 * ====================================================================
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 *
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 * This product includes cryptographic software written by Eric Young
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 * (eay@cryptsoft.com).  This product includes software written by Tim
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 * Hudson (tjh@cryptsoft.com). */
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#include <openssl/ecdh.h>
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#include <limits.h>
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#include <string.h>
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#include <openssl/digest.h>
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#include <openssl/err.h>
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#include <openssl/mem.h>
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#include "../fipsmodule/ec/internal.h"
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#include "../internal.h"
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int ECDH_compute_key(void *out, size_t out_len, const EC_POINT *pub_key,
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                     const EC_KEY *priv_key,
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                     void *(*kdf)(const void *in, size_t inlen, void *out,
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                                  size_t *out_len)) {
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  if (priv_key->priv_key == NULL) {
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0
    OPENSSL_PUT_ERROR(ECDH, ECDH_R_NO_PRIVATE_VALUE);
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0
    return -1;
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0
  }
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  const EC_SCALAR *const priv = &priv_key->priv_key->scalar;
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  const EC_GROUP *const group = EC_KEY_get0_group(priv_key);
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  if (EC_GROUP_cmp(group, pub_key->group, NULL) != 0) {
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    OPENSSL_PUT_ERROR(EC, EC_R_INCOMPATIBLE_OBJECTS);
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    return -1;
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0
  }
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  EC_JACOBIAN shared_point;
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  uint8_t buf[EC_MAX_BYTES];
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  size_t buf_len;
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  if (!ec_point_mul_scalar(group, &shared_point, &pub_key->raw, priv) ||
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      !ec_get_x_coordinate_as_bytes(group, buf, &buf_len, sizeof(buf),
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                                    &shared_point)) {
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    OPENSSL_PUT_ERROR(ECDH, ECDH_R_POINT_ARITHMETIC_FAILURE);
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    return -1;
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0
  }
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  if (kdf != NULL) {
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    if (kdf(buf, buf_len, out, &out_len) == NULL) {
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      OPENSSL_PUT_ERROR(ECDH, ECDH_R_KDF_FAILED);
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      return -1;
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    }
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  } else {
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    // no KDF, just copy as much as we can
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    if (buf_len < out_len) {
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      out_len = buf_len;
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    }
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    OPENSSL_memcpy(out, buf, out_len);
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  }
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  if (out_len > INT_MAX) {
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    OPENSSL_PUT_ERROR(ECDH, ERR_R_OVERFLOW);
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    return -1;
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  }
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  return (int)out_len;
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}