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Added function to create onion packets to send via TCP.

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irungentoo 2014-08-13 06:41:35 -04:00
parent 19b07f7e80
commit 70d338703d
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GPG Key ID: 10349DC9BED89E98
2 changed files with 61 additions and 0 deletions
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48
toxcore/onion.c
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@ -141,6 +141,54 @@ int create_onion_packet(uint8_t *packet, uint16_t max_packet_length, const Onion
return 1 + crypto_box_NONCEBYTES + crypto_box_PUBLICKEYBYTES + len;
}
/* Create a onion packet to be sent over tcp.
*
* Use Onion_Path path to create packet for data of length to dest.
* Maximum length of data is ONION_MAX_DATA_SIZE.
* packet should be at least ONION_MAX_PACKET_SIZE big.
*
* return -1 on failure.
* return length of created packet on success.
*/
int create_onion_packet_tcp(uint8_t *packet, uint16_t max_packet_length, const Onion_Path *path, IP_Port dest,
const uint8_t *data, uint32_t length)
{
if (crypto_box_NONCEBYTES + SIZE_IPPORT + SEND_BASE * 2 + length > max_packet_length || length == 0)
return -1;
to_net_family(&dest.ip);
uint8_t step1[SIZE_IPPORT + length];
ipport_pack(step1, &dest);
memcpy(step1 + SIZE_IPPORT, data, length);
uint8_t nonce[crypto_box_NONCEBYTES];
random_nonce(nonce);
uint8_t step2[SIZE_IPPORT + SEND_BASE + length];
ipport_pack(step2, &path->ip_port3);
memcpy(step2 + SIZE_IPPORT, path->public_key3, crypto_box_PUBLICKEYBYTES);
int len = encrypt_data_symmetric(path->shared_key3, nonce, step1, sizeof(step1),
step2 + SIZE_IPPORT + crypto_box_PUBLICKEYBYTES);
if ((uint32_t)len != SIZE_IPPORT + length + crypto_box_MACBYTES)
return -1;
ipport_pack(packet + crypto_box_NONCEBYTES, &path->ip_port2);
memcpy(packet + crypto_box_NONCEBYTES + SIZE_IPPORT, path->public_key2, crypto_box_PUBLICKEYBYTES);
len = encrypt_data_symmetric(path->shared_key2, nonce, step2, sizeof(step2),
packet + crypto_box_NONCEBYTES + SIZE_IPPORT + crypto_box_PUBLICKEYBYTES);
if ((uint32_t)len != SIZE_IPPORT + SEND_BASE + length + crypto_box_MACBYTES)
return -1;
memcpy(packet, nonce, crypto_box_NONCEBYTES);
return crypto_box_NONCEBYTES + SIZE_IPPORT + crypto_box_PUBLICKEYBYTES + len;
}
/* Create and send a onion packet.
*
* Use Onion_Path path to send data of length to dest.

13
toxcore/onion.h
View File

@ -92,6 +92,19 @@ int create_onion_path(const DHT *dht, Onion_Path *new_path, const Node_format *n
int create_onion_packet(uint8_t *packet, uint16_t max_packet_length, const Onion_Path *path, IP_Port dest,
const uint8_t *data, uint32_t length);
/* Create a onion packet to be sent over tcp.
*
* Use Onion_Path path to create packet for data of length to dest.
* Maximum length of data is ONION_MAX_DATA_SIZE.
* packet should be at least ONION_MAX_PACKET_SIZE big.
*
* return -1 on failure.
* return length of created packet on success.
*/
int create_onion_packet_tcp(uint8_t *packet, uint16_t max_packet_length, const Onion_Path *path, IP_Port dest,
const uint8_t *data, uint32_t length);
/* Create and send a onion packet.
*
* Use Onion_Path path to send data of length to dest.