2 * Copyright (c) 2020 Doc.ai and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 #include <wireguard/wireguard_key.h>
17 #include <openssl/evp.h>
20 curve25519_gen_shared (u8 shared_key[CURVE25519_KEY_SIZE],
21 const u8 secret_key[CURVE25519_KEY_SIZE],
22 const u8 basepoint[CURVE25519_KEY_SIZE])
29 EVP_PKEY *peerkey = NULL;
31 EVP_PKEY_new_raw_private_key (EVP_PKEY_X25519, NULL, secret_key,
36 ctx = EVP_PKEY_CTX_new (pkey, NULL);
37 if (EVP_PKEY_derive_init (ctx) <= 0)
44 EVP_PKEY_new_raw_public_key (EVP_PKEY_X25519, NULL, basepoint,
46 if (EVP_PKEY_derive_set_peer (ctx, peerkey) <= 0)
52 key_len = CURVE25519_KEY_SIZE;
53 if (EVP_PKEY_derive (ctx, shared_key, &key_len) <= 0)
59 EVP_PKEY_CTX_free (ctx);
61 EVP_PKEY_free (peerkey);
66 curve25519_gen_public (u8 public_key[CURVE25519_KEY_SIZE],
67 const u8 secret_key[CURVE25519_KEY_SIZE])
71 EVP_PKEY_new_raw_private_key (EVP_PKEY_X25519, NULL, secret_key,
73 pub_len = CURVE25519_KEY_SIZE;
74 if (!EVP_PKEY_get_raw_public_key (pkey, public_key, &pub_len))
84 curve25519_gen_secret (u8 secret_key[CURVE25519_KEY_SIZE])
87 EVP_PKEY *pkey = NULL;
88 EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id (EVP_PKEY_X25519, NULL);
89 EVP_PKEY_keygen_init (pctx);
90 EVP_PKEY_keygen (pctx, &pkey);
91 EVP_PKEY_CTX_free (pctx);
93 secret_len = CURVE25519_KEY_SIZE;
94 if (!EVP_PKEY_get_raw_private_key (pkey, secret_key, &secret_len))
104 key_to_base64 (const u8 * src, size_t src_len, u8 * out)
106 if (!EVP_EncodeBlock (out, src, src_len))
112 key_from_base64 (const u8 * src, size_t src_len, u8 * out)
114 if (EVP_DecodeBlock (out, src, src_len - 1) <= 0)
120 * fd.io coding-style-patch-verification: ON
123 * eval: (c-set-style "gnu")