[164] | 1 | /* curve25519.h
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| 2 | *
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| 3 | * Copyright (C) 2006-2015 wolfSSL Inc.
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| 4 | *
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| 5 | * This file is part of wolfSSL. (formerly known as CyaSSL)
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| 6 | *
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| 7 | * wolfSSL is free software; you can redistribute it and/or modify
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| 8 | * it under the terms of the GNU General Public License as published by
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| 9 | * the Free Software Foundation; either version 2 of the License, or
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| 10 | * (at your option) any later version.
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| 11 | *
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| 12 | * wolfSSL is distributed in the hope that it will be useful,
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | * GNU General Public License for more details.
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| 16 | *
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| 17 | * You should have received a copy of the GNU General Public License
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| 18 | * along with this program; if not, write to the Free Software
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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| 20 | */
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| 21 |
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| 22 | #ifndef WOLF_CRYPT_CURVE25519_H
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| 23 | #define WOLF_CRYPT_CURVE25519_H
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| 24 |
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| 25 | #include <wolfssl/wolfcrypt/types.h>
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| 26 |
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| 27 | #ifdef HAVE_CURVE25519
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| 28 |
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| 29 | #include <wolfssl/wolfcrypt/fe_operations.h>
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| 30 | #include <wolfssl/wolfcrypt/random.h>
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| 31 |
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| 32 | #ifdef __cplusplus
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| 33 | extern "C" {
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| 34 | #endif
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| 35 |
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| 36 | #define CURVE25519_KEYSIZE 32
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| 37 |
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| 38 | /* curve25519 set type */
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| 39 | typedef struct {
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| 40 | int size; /* The size of the curve in octets */
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| 41 | const char* name; /* name of this curve */
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| 42 | } curve25519_set_type;
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| 43 |
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| 44 |
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| 45 | /* ECC point, the internal structure is Little endian
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| 46 | * the mathematical functions used the endianess */
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| 47 | typedef struct {
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| 48 | byte point[CURVE25519_KEYSIZE];
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| 49 | }ECPoint;
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| 50 |
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| 51 | /* A CURVE25519 Key */
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| 52 | typedef struct {
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| 53 | int idx; /* Index into the ecc_sets[] for the parameters of
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| 54 | this curve if -1, this key is using user supplied
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| 55 | curve in dp */
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| 56 | const curve25519_set_type* dp; /* domain parameters, either points to
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| 57 | curves (idx >= 0) or user supplied */
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| 58 | ECPoint p; /* public key */
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| 59 | ECPoint k; /* private key */
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| 60 | } curve25519_key;
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| 61 |
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| 62 | enum {
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| 63 | EC25519_LITTLE_ENDIAN=0,
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| 64 | EC25519_BIG_ENDIAN=1
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| 65 | };
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| 66 |
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| 67 | WOLFSSL_API
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| 68 | int wc_curve25519_make_key(WC_RNG* rng, int keysize, curve25519_key* key);
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| 69 |
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| 70 | WOLFSSL_API
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| 71 | int wc_curve25519_shared_secret(curve25519_key* private_key,
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| 72 | curve25519_key* public_key,
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| 73 | byte* out, word32* outlen);
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| 74 |
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| 75 | WOLFSSL_API
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| 76 | int wc_curve25519_shared_secret_ex(curve25519_key* private_key,
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| 77 | curve25519_key* public_key,
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| 78 | byte* out, word32* outlen, int endian);
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| 79 |
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| 80 | WOLFSSL_API
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| 81 | int wc_curve25519_init(curve25519_key* key);
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| 82 |
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| 83 | WOLFSSL_API
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| 84 | void wc_curve25519_free(curve25519_key* key);
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| 85 |
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| 86 |
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| 87 | /* raw key helpers */
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| 88 | WOLFSSL_API
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| 89 | int wc_curve25519_import_private(const byte* priv, word32 privSz,
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| 90 | curve25519_key* key);
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| 91 | WOLFSSL_API
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| 92 | int wc_curve25519_import_private_ex(const byte* priv, word32 privSz,
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| 93 | curve25519_key* key, int endian);
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| 94 |
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| 95 | WOLFSSL_API
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| 96 | int wc_curve25519_import_private_raw(const byte* priv, word32 privSz,
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| 97 | const byte* pub, word32 pubSz, curve25519_key* key);
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| 98 | WOLFSSL_API
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| 99 | int wc_curve25519_import_private_raw_ex(const byte* priv, word32 privSz,
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| 100 | const byte* pub, word32 pubSz,
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| 101 | curve25519_key* key, int endian);
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| 102 | WOLFSSL_API
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| 103 | int wc_curve25519_export_private_raw(curve25519_key* key, byte* out,
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| 104 | word32* outLen);
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| 105 | WOLFSSL_API
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| 106 | int wc_curve25519_export_private_raw_ex(curve25519_key* key, byte* out,
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| 107 | word32* outLen, int endian);
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| 108 |
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| 109 | WOLFSSL_API
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| 110 | int wc_curve25519_import_public(const byte* in, word32 inLen,
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| 111 | curve25519_key* key);
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| 112 | WOLFSSL_API
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| 113 | int wc_curve25519_import_public_ex(const byte* in, word32 inLen,
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| 114 | curve25519_key* key, int endian);
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| 115 |
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| 116 | WOLFSSL_API
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| 117 | int wc_curve25519_export_public(curve25519_key* key, byte* out, word32* outLen);
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| 118 | WOLFSSL_API
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| 119 | int wc_curve25519_export_public_ex(curve25519_key* key, byte* out,
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| 120 | word32* outLen, int endian);
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| 121 |
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| 122 | WOLFSSL_API
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| 123 | int wc_curve25519_export_key_raw(curve25519_key* key,
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| 124 | byte* priv, word32 *privSz,
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| 125 | byte* pub, word32 *pubSz);
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| 126 | WOLFSSL_API
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| 127 | int wc_curve25519_export_key_raw_ex(curve25519_key* key,
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| 128 | byte* priv, word32 *privSz,
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| 129 | byte* pub, word32 *pubSz,
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| 130 | int endian);
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| 131 | /* size helper */
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| 132 | WOLFSSL_API
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| 133 | int wc_curve25519_size(curve25519_key* key);
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| 134 |
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| 135 | #ifdef __cplusplus
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| 136 | } /* extern "C" */
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| 137 | #endif
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| 138 |
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| 139 | #endif /* HAVE_CURVE25519 */
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| 140 | #endif /* WOLF_CRYPT_CURVE25519_H */
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| 141 |
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