1 /*
2 * Interface to code from Project Everest
3 *
4 * Copyright 2016-2018 INRIA and Microsoft Corporation
5 * SPDX-License-Identifier: Apache-2.0
6 *
7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
8 * not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 *
19 * This file is part of Mbed TLS (https://tls.mbed.org).
20 */
21
22 #include "common.h"
23
24 #include <string.h>
25
26 #include "mbedtls/ecdh.h"
27
28 #include "everest/x25519.h"
29 #include "everest/everest.h"
30
31 #if defined(MBEDTLS_PLATFORM_C)
32 #include "mbedtls/platform.h"
33 #else
34 #define mbedtls_calloc calloc
35 #define mbedtls_free free
36 #endif
37
38 #if defined(MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED)
39
mbedtls_everest_setup(mbedtls_ecdh_context_everest * ctx,int grp_id)40 int mbedtls_everest_setup( mbedtls_ecdh_context_everest *ctx, int grp_id )
41 {
42 if( grp_id != MBEDTLS_ECP_DP_CURVE25519 )
43 return MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
44 mbedtls_x25519_init( &ctx->ctx );
45 return 0;
46 }
47
mbedtls_everest_free(mbedtls_ecdh_context_everest * ctx)48 void mbedtls_everest_free( mbedtls_ecdh_context_everest *ctx )
49 {
50 mbedtls_x25519_free( &ctx->ctx );
51 }
52
mbedtls_everest_make_params(mbedtls_ecdh_context_everest * ctx,size_t * olen,unsigned char * buf,size_t blen,int (* f_rng)(void *,unsigned char *,size_t),void * p_rng)53 int mbedtls_everest_make_params( mbedtls_ecdh_context_everest *ctx, size_t *olen,
54 unsigned char *buf, size_t blen,
55 int( *f_rng )( void *, unsigned char *, size_t ),
56 void *p_rng )
57 {
58 mbedtls_x25519_context *x25519_ctx = &ctx->ctx;
59 return mbedtls_x25519_make_params( x25519_ctx, olen, buf, blen, f_rng, p_rng );
60 }
61
mbedtls_everest_read_params(mbedtls_ecdh_context_everest * ctx,const unsigned char ** buf,const unsigned char * end)62 int mbedtls_everest_read_params( mbedtls_ecdh_context_everest *ctx,
63 const unsigned char **buf,
64 const unsigned char *end )
65 {
66 mbedtls_x25519_context *x25519_ctx = &ctx->ctx;
67 return mbedtls_x25519_read_params( x25519_ctx, buf, end );
68 }
69
mbedtls_everest_get_params(mbedtls_ecdh_context_everest * ctx,const mbedtls_ecp_keypair * key,mbedtls_everest_ecdh_side side)70 int mbedtls_everest_get_params( mbedtls_ecdh_context_everest *ctx,
71 const mbedtls_ecp_keypair *key,
72 mbedtls_everest_ecdh_side side )
73 {
74 mbedtls_x25519_context *x25519_ctx = &ctx->ctx;
75 mbedtls_x25519_ecdh_side s = side == MBEDTLS_EVEREST_ECDH_OURS ?
76 MBEDTLS_X25519_ECDH_OURS :
77 MBEDTLS_X25519_ECDH_THEIRS;
78 return mbedtls_x25519_get_params( x25519_ctx, key, s );
79 }
80
mbedtls_everest_make_public(mbedtls_ecdh_context_everest * ctx,size_t * olen,unsigned char * buf,size_t blen,int (* f_rng)(void *,unsigned char *,size_t),void * p_rng)81 int mbedtls_everest_make_public( mbedtls_ecdh_context_everest *ctx, size_t *olen,
82 unsigned char *buf, size_t blen,
83 int( *f_rng )( void *, unsigned char *, size_t ),
84 void *p_rng )
85 {
86 mbedtls_x25519_context *x25519_ctx = &ctx->ctx;
87 return mbedtls_x25519_make_public( x25519_ctx, olen, buf, blen, f_rng, p_rng );
88 }
89
mbedtls_everest_read_public(mbedtls_ecdh_context_everest * ctx,const unsigned char * buf,size_t blen)90 int mbedtls_everest_read_public( mbedtls_ecdh_context_everest *ctx,
91 const unsigned char *buf, size_t blen )
92 {
93 mbedtls_x25519_context *x25519_ctx = &ctx->ctx;
94 return mbedtls_x25519_read_public ( x25519_ctx, buf, blen );
95 }
96
mbedtls_everest_calc_secret(mbedtls_ecdh_context_everest * ctx,size_t * olen,unsigned char * buf,size_t blen,int (* f_rng)(void *,unsigned char *,size_t),void * p_rng)97 int mbedtls_everest_calc_secret( mbedtls_ecdh_context_everest *ctx, size_t *olen,
98 unsigned char *buf, size_t blen,
99 int( *f_rng )( void *, unsigned char *, size_t ),
100 void *p_rng )
101 {
102 mbedtls_x25519_context *x25519_ctx = &ctx->ctx;
103 return mbedtls_x25519_calc_secret( x25519_ctx, olen, buf, blen, f_rng, p_rng );
104 }
105
106 #endif /* MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED */
107
108