First part of DHT hardening done.

Added crypto to the DHT communications.

This defeats completely the first attack mentioned in
docs/DHT_hardening.

Also updated the build system to build the latest test (it links it with
libsodium)

1 files changed, 6 insertions, 1 deletions

diff --git a/core/net_crypto.h b/core/net_crypto.h
index fe655c92..4c3b53de 100644
--- a/core/net_crypto.h
+++ b/core/net_crypto.h
@@ -32,8 +32,9 @@
 #endif
 //Our public key.
 extern uint8_t self_public_key[crypto_box_PUBLICKEYBYTES];
+extern uint8_t self_secret_key[crypto_box_SECRETKEYBYTES];
 
-
+#define ENCRYPTION_PADDING (crypto_box_ZEROBYTES - crypto_box_BOXZEROBYTES)
 
 //encrypts plain of length length to encrypted of length + 16 using the 
 //public key(32 bytes) of the receiver and the secret key of the sender and a 24 byte nonce
@@ -51,6 +52,10 @@ int decrypt_data(uint8_t * public_key, uint8_t * secret_key, uint8_t * nonce,
                                        uint8_t * encrypted, uint32_t length, uint8_t * plain);
 
 
+//fill the given nonce with random bytes.
+void random_nonce(uint8_t * nonce);
+
+
 //return 0 if there is no received data in the buffer 
 //return -1  if the packet was discarded.
 //return length of received data if successful