everest.c (3718B)
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 #include "mbedtls/platform.h" 32 33 #if defined(MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED) 34 35 int mbedtls_everest_setup( mbedtls_ecdh_context_everest *ctx, int grp_id ) 36 { 37 if( grp_id != MBEDTLS_ECP_DP_CURVE25519 ) 38 return MBEDTLS_ERR_ECP_BAD_INPUT_DATA; 39 mbedtls_x25519_init( &ctx->ctx ); 40 return 0; 41 } 42 43 void mbedtls_everest_free( mbedtls_ecdh_context_everest *ctx ) 44 { 45 mbedtls_x25519_free( &ctx->ctx ); 46 } 47 48 int mbedtls_everest_make_params( mbedtls_ecdh_context_everest *ctx, size_t *olen, 49 unsigned char *buf, size_t blen, 50 int( *f_rng )( void *, unsigned char *, size_t ), 51 void *p_rng ) 52 { 53 mbedtls_x25519_context *x25519_ctx = &ctx->ctx; 54 return mbedtls_x25519_make_params( x25519_ctx, olen, buf, blen, f_rng, p_rng ); 55 } 56 57 int mbedtls_everest_read_params( mbedtls_ecdh_context_everest *ctx, 58 const unsigned char **buf, 59 const unsigned char *end ) 60 { 61 mbedtls_x25519_context *x25519_ctx = &ctx->ctx; 62 return mbedtls_x25519_read_params( x25519_ctx, buf, end ); 63 } 64 65 int mbedtls_everest_get_params( mbedtls_ecdh_context_everest *ctx, 66 const mbedtls_ecp_keypair *key, 67 mbedtls_everest_ecdh_side side ) 68 { 69 mbedtls_x25519_context *x25519_ctx = &ctx->ctx; 70 mbedtls_x25519_ecdh_side s = side == MBEDTLS_EVEREST_ECDH_OURS ? 71 MBEDTLS_X25519_ECDH_OURS : 72 MBEDTLS_X25519_ECDH_THEIRS; 73 return mbedtls_x25519_get_params( x25519_ctx, key, s ); 74 } 75 76 int mbedtls_everest_make_public( mbedtls_ecdh_context_everest *ctx, size_t *olen, 77 unsigned char *buf, size_t blen, 78 int( *f_rng )( void *, unsigned char *, size_t ), 79 void *p_rng ) 80 { 81 mbedtls_x25519_context *x25519_ctx = &ctx->ctx; 82 return mbedtls_x25519_make_public( x25519_ctx, olen, buf, blen, f_rng, p_rng ); 83 } 84 85 int mbedtls_everest_read_public( mbedtls_ecdh_context_everest *ctx, 86 const unsigned char *buf, size_t blen ) 87 { 88 mbedtls_x25519_context *x25519_ctx = &ctx->ctx; 89 return mbedtls_x25519_read_public ( x25519_ctx, buf, blen ); 90 } 91 92 int mbedtls_everest_calc_secret( mbedtls_ecdh_context_everest *ctx, size_t *olen, 93 unsigned char *buf, size_t blen, 94 int( *f_rng )( void *, unsigned char *, size_t ), 95 void *p_rng ) 96 { 97 mbedtls_x25519_context *x25519_ctx = &ctx->ctx; 98 return mbedtls_x25519_calc_secret( x25519_ctx, olen, buf, blen, f_rng, p_rng ); 99 } 100 101 #endif /* MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED */ 102