miegl/glorytun
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Use xored random data in the hash

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angt
2015-11-06 18:59:39 +01:00
parent 98331d8b7c
commit f53c78f861
1 changed files with 20 additions and 17 deletions
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37
glorytun.c
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@@ -538,13 +538,14 @@ static ssize_t get_ip_size (const uint8_t *data, size_t size)
static void gt_setup_crypto (struct crypto_ctx *ctx, int fd, int listener)
{
unsigned char secret[crypto_scalarmult_SCALARBYTES];
unsigned char shared[crypto_scalarmult_BYTES];
uint8_t secret[crypto_scalarmult_SCALARBYTES];
uint8_t shared[crypto_scalarmult_BYTES];
uint8_t key[crypto_aead_aes256gcm_KEYBYTES];
unsigned char public_w[crypto_scalarmult_SCALARBYTES];
unsigned char public_r[crypto_scalarmult_SCALARBYTES];
unsigned char key[crypto_aead_aes256gcm_KEYBYTES];
uint8_t public_r[crypto_scalarmult_SCALARBYTES];
uint8_t public_w[crypto_scalarmult_SCALARBYTES];
uint8_t public_x[crypto_scalarmult_SCALARBYTES];
uint8_t nonce_x[crypto_aead_aes256gcm_NPUBBYTES];
randombytes_buf(secret, sizeof(secret));
crypto_scalarmult_base(public_w, secret);
@@ -557,29 +558,31 @@ static void gt_setup_crypto (struct crypto_ctx *ctx, int fd, int listener)
if (listener)
fd_write_all(fd, public_w, sizeof(public_w));
randombytes_buf(ctx->nonce_w, sizeof(ctx->nonce_w));
fd_write_all(fd, ctx->nonce_w, sizeof(ctx->nonce_w));
fd_read_all(fd, ctx->nonce_r, sizeof(ctx->nonce_r));
for (size_t i=0; i<sizeof(public_x); i++)
public_x[i] = public_r[i]^public_w[i];
for (size_t i=0; i<sizeof(nonce_x); i++)
nonce_x[i] = ctx->nonce_r[i]^ctx->nonce_w[i];
crypto_scalarmult(shared, secret, public_r);
crypto_generichash_state state;
crypto_generichash_init(&state, NULL, 0, sizeof(key));
crypto_generichash_update(&state, shared, sizeof(shared));
crypto_generichash_update(&state, listener?public_w:public_r, sizeof(public_w));
crypto_generichash_update(&state, listener?public_r:public_w, sizeof(public_w));
crypto_generichash_update(&state, public_x, sizeof(public_x));
crypto_generichash_update(&state, nonce_x, sizeof(nonce_x));
crypto_generichash_final(&state, key, sizeof(key));
crypto_aead_aes256gcm_beforenm(&ctx->state, key);
sodium_memzero(secret, sizeof(secret));
sodium_memzero(shared, sizeof(shared));
sodium_memzero(public_w, sizeof(public_w));
sodium_memzero(public_r, sizeof(public_r));
sodium_memzero(key, sizeof(key));
randombytes_buf(ctx->nonce_w, sizeof(ctx->nonce_w));
fd_write_all(fd, ctx->nonce_w, sizeof(ctx->nonce_w));
fd_read_all(fd, ctx->nonce_r, sizeof(ctx->nonce_r));
}
int main (int argc, char **argv)