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/*
* Copyright (c) 2020 Doc.ai and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <wireguard/wireguard_key.h>
#include <openssl/evp.h>
bool
curve25519_gen_shared (u8 shared_key[CURVE25519_KEY_SIZE],
const u8 secret_key[CURVE25519_KEY_SIZE],
const u8 basepoint[CURVE25519_KEY_SIZE])
{
bool ret;
EVP_PKEY_CTX *ctx;
size_t key_len;
EVP_PKEY *peerkey = NULL;
EVP_PKEY *pkey =
EVP_PKEY_new_raw_private_key (EVP_PKEY_X25519, NULL, secret_key,
CURVE25519_KEY_SIZE);
ret = true;
ctx = EVP_PKEY_CTX_new (pkey, NULL);
if (EVP_PKEY_derive_init (ctx) <= 0)
{
ret = false;
goto out;
}
peerkey =
EVP_PKEY_new_raw_public_key (EVP_PKEY_X25519, NULL, basepoint,
CURVE25519_KEY_SIZE);
if (EVP_PKEY_derive_set_peer (ctx, peerkey) <= 0)
{
ret = false;
goto out;
}
key_len = CURVE25519_KEY_SIZE;
if (EVP_PKEY_derive (ctx, shared_key, &key_len) <= 0)
{
ret = false;
}
out:
EVP_PKEY_CTX_free (ctx);
EVP_PKEY_free (pkey);
EVP_PKEY_free (peerkey);
return ret;
}
bool
curve25519_gen_public (u8 public_key[CURVE25519_KEY_SIZE],
const u8 secret_key[CURVE25519_KEY_SIZE])
{
size_t pub_len;
EVP_PKEY *pkey =
EVP_PKEY_new_raw_private_key (EVP_PKEY_X25519, NULL, secret_key,
CURVE25519_KEY_SIZE);
pub_len = CURVE25519_KEY_SIZE;
if (!EVP_PKEY_get_raw_public_key (pkey, public_key, &pub_len))
{
EVP_PKEY_free (pkey);
return false;
}
EVP_PKEY_free (pkey);
return true;
}
bool
curve25519_gen_secret (u8 secret_key[CURVE25519_KEY_SIZE])
{
size_t secret_len;
EVP_PKEY *pkey = NULL;
EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id (EVP_PKEY_X25519, NULL);
EVP_PKEY_keygen_init (pctx);
EVP_PKEY_keygen (pctx, &pkey);
EVP_PKEY_CTX_free (pctx);
secret_len = CURVE25519_KEY_SIZE;
if (!EVP_PKEY_get_raw_private_key (pkey, secret_key, &secret_len))
{
EVP_PKEY_free (pkey);
return false;
}
EVP_PKEY_free (pkey);
return true;
}
bool
key_to_base64 (const u8 * src, size_t src_len, u8 * out)
{
if (!EVP_EncodeBlock (out, src, src_len))
return false;
return true;
}
bool
key_from_base64 (const u8 * src, size_t src_len, u8 * out)
{
if (EVP_DecodeBlock (out, src, src_len - 1) <= 0)
return false;
return true;
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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