• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 /* ====================================================================
2  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
3  *
4  * The Elliptic Curve Public-Key Crypto Library (ECC Code) included
5  * herein is developed by SUN MICROSYSTEMS, INC., and is contributed
6  * to the OpenSSL project.
7  *
8  * The ECC Code is licensed pursuant to the OpenSSL open source
9  * license provided below.
10  *
11  * The ECDH software is originally written by Douglas Stebila of
12  * Sun Microsystems Laboratories.
13  *
14  */
15 /* ====================================================================
16  * Copyright (c) 2000-2002 The OpenSSL Project.  All rights reserved.
17  *
18  * Redistribution and use in source and binary forms, with or without
19  * modification, are permitted provided that the following conditions
20  * are met:
21  *
22  * 1. Redistributions of source code must retain the above copyright
23  *    notice, this list of conditions and the following disclaimer.
24  *
25  * 2. Redistributions in binary form must reproduce the above copyright
26  *    notice, this list of conditions and the following disclaimer in
27  *    the documentation and/or other materials provided with the
28  *    distribution.
29  *
30  * 3. All advertising materials mentioning features or use of this
31  *    software must display the following acknowledgment:
32  *    "This product includes software developed by the OpenSSL Project
33  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
34  *
35  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
36  *    endorse or promote products derived from this software without
37  *    prior written permission. For written permission, please contact
38  *    licensing@OpenSSL.org.
39  *
40  * 5. Products derived from this software may not be called "OpenSSL"
41  *    nor may "OpenSSL" appear in their names without prior written
42  *    permission of the OpenSSL Project.
43  *
44  * 6. Redistributions of any form whatsoever must retain the following
45  *    acknowledgment:
46  *    "This product includes software developed by the OpenSSL Project
47  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
48  *
49  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
50  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
51  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
52  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
53  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
54  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
55  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
56  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
58  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
59  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
60  * OF THE POSSIBILITY OF SUCH DAMAGE.
61  * ====================================================================
62  *
63  * This product includes cryptographic software written by Eric Young
64  * (eay@cryptsoft.com).  This product includes software written by Tim
65  * Hudson (tjh@cryptsoft.com). */
66 
67 #include <openssl/ecdh.h>
68 
69 #include <string.h>
70 
71 #include <openssl/ec.h>
72 #include <openssl/ec_key.h>
73 #include <openssl/err.h>
74 #include <openssl/mem.h>
75 #include <openssl/sha.h>
76 
77 #include "../ec/internal.h"
78 
79 
ECDH_compute_key_fips(uint8_t * out,size_t out_len,const EC_POINT * pub_key,const EC_KEY * priv_key)80 int ECDH_compute_key_fips(uint8_t *out, size_t out_len, const EC_POINT *pub_key,
81                           const EC_KEY *priv_key) {
82   if (priv_key->priv_key == NULL) {
83     OPENSSL_PUT_ERROR(ECDH, ECDH_R_NO_PRIVATE_VALUE);
84     return 0;
85   }
86   const EC_SCALAR *const priv = &priv_key->priv_key->scalar;
87   const EC_GROUP *const group = EC_KEY_get0_group(priv_key);
88   if (EC_GROUP_cmp(group, pub_key->group, NULL) != 0) {
89     OPENSSL_PUT_ERROR(EC, EC_R_INCOMPATIBLE_OBJECTS);
90     return 0;
91   }
92 
93   EC_RAW_POINT shared_point;
94   uint8_t buf[EC_MAX_BYTES];
95   size_t buflen;
96   if (!ec_point_mul_scalar(group, &shared_point, NULL, &pub_key->raw, priv) ||
97       !ec_point_get_affine_coordinate_bytes(group, buf, NULL, &buflen,
98                                             sizeof(buf), &shared_point)) {
99     OPENSSL_PUT_ERROR(ECDH, ECDH_R_POINT_ARITHMETIC_FAILURE);
100     return 0;
101   }
102 
103   switch (out_len) {
104     case SHA224_DIGEST_LENGTH:
105       SHA224(buf, buflen, out);
106       break;
107     case SHA256_DIGEST_LENGTH:
108       SHA256(buf, buflen, out);
109       break;
110     case SHA384_DIGEST_LENGTH:
111       SHA384(buf, buflen, out);
112       break;
113     case SHA512_DIGEST_LENGTH:
114       SHA512(buf, buflen, out);
115       break;
116     default:
117       OPENSSL_PUT_ERROR(ECDH, ECDH_R_UNKNOWN_DIGEST_LENGTH);
118       return 0;
119   }
120 
121   return 1;
122 }
123