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Add a very simple client and server authentication

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angt
2015-11-16 16:35:43 +01:00
parent 6095cc021a
commit 246f1bd7c0
1 changed files with 16 additions and 2 deletions
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18
src/main.c
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@@ -487,8 +487,6 @@ static int gt_setup_secretkey (struct crypto_ctx *ctx, char *keyfile)
return -1;
}
// TODO: check key
close(fd);
return 0;
@@ -506,6 +504,7 @@ static int gt_setup_crypto (struct crypto_ctx *ctx, int fd, int listener)
uint8_t key[crypto_aead_aes256gcm_KEYBYTES];
uint8_t data_r[size], data_w[size];
uint8_t auth_r[hash_size], auth_w[hash_size];
uint8_t hash[hash_size];
randombytes_buf(data_w, nonce_size);
@@ -530,6 +529,21 @@ static int gt_setup_crypto (struct crypto_ctx *ctx, int fd, int listener)
if (listener && fd_write_all(fd, data_w, size)!=size)
return -1;
crypto_generichash(auth_w, hash_size,
data_r, size, ctx->skey, sizeof(ctx->skey));
if (fd_write_all(fd, auth_w, hash_size)!=hash_size)
return -1;
if (fd_read_all(fd, auth_r, hash_size)!=hash_size)
return -1;
crypto_generichash(hash, hash_size,
data_w, size, ctx->skey, sizeof(ctx->skey));
if (sodium_memcmp(auth_r, hash, hash_size))
return -2;
crypto_scalarmult(shared, secret, &data_r[nonce_size]);
crypto_generichash_state state;