int encode_SNM_hdr( uint8_t *base,
size_t *idx,
const snm_hdr_t *hdr )
{
int retval = 0;
retval += encode_uint8(base, idx, hdr->type);
retval += encode_uint8(base, idx, hdr->flags);
retval += encode_uint16(base, idx, hdr->seq_num);
return retval;
}
void test_command_with_args() {
uint8_t buf[255];
int pos = 0;
int rc;
uint8_t dest;
uint8_t code;
uint16_t mref;
rc = encode_cmd(buf, &pos, LS1P_ADDR_ARM, LS1P_REQ_CODE_CMDLOG, 314);
assert(rc == LS1P_API_OK);
assert(pos == 3);
assert(buf[0] == 0x01);
rc = encode_uint8(buf, &pos, 123);
assert(rc == LS1P_API_OK);
assert(pos == 4);
rc = encode_uint16(buf, &pos, 4023);
assert(rc == LS1P_API_OK);
assert(pos == 6);
assert(buf[0] == 0x01);
assert(buf[1] == 0x01);
assert(buf[2] == 0x3A);
assert(buf[3] == 0x7B);
assert(buf[4] == 0x0F);
assert(buf[5] == 0xB7);
rc = decode_cmd(buf, &pos, &dest, &code, &mref);
assert(rc == LS1P_API_OK);
assert(dest == LS1P_ADDR_ARM);
assert(code == LS1P_REQ_CODE_CMDLOG);
assert(mref == 314);
assert(pos == 3);
}
int encode_SNM_comm( uint8_t *base,
size_t *idx,
const snm_comm_name_t *comm_name )
{
int retval = 0;
retval += encode_uint8(base, idx, comm_name->size);
retval += encode_buf(base, idx, comm_name->name, comm_name->size);
return retval;
}
/** The twofish packet format consists of:
*
* - a 8-bit twofish encoding version in clear text
* - a 32-bit SA number in clear text
* - ciphertext encrypted from a 32-bit nonce followed by the payload.
*
* [V|SSSS|nnnnDDDDDDDDDDDDDDDDDDDDD]
* |<------ encrypted ------>|
*/
static int transop_encode_twofish( ntvl_trans_op_t * arg,
uint8_t * outbuf,
size_t out_len,
const uint8_t * inbuf,
size_t in_len ) {
int len=-1;
transop_tf_t * priv = (transop_tf_t *)arg->priv;
uint8_t assembly[NTVL_PKT_BUF_SIZE];
uint32_t * pnonce;
if ( (in_len + TRANSOP_TF_NONCE_SIZE) <= NTVL_PKT_BUF_SIZE ) {
if ( (in_len + TRANSOP_TF_NONCE_SIZE + TRANSOP_TF_SA_SIZE + TRANSOP_TF_VER_SIZE) <= out_len ) {
size_t idx=0;
sa_twofish_t * sa;
size_t tx_sa_num = 0;
/* The transmit sa is periodically updated */
tx_sa_num = tf_choose_tx_sa( priv );
sa = &(priv->sa[tx_sa_num]); /* Proper Tx SA index */
traceEvent( TRACE_DEBUG, "encode_twofish %lu with SA %lu.", in_len, sa->sa_id );
/* Encode the twofish format version. */
encode_uint8( outbuf, &idx, NTVL_TWOFISH_TRANSFORM_VERSION );
/* Encode the security association (SA) number */
encode_uint32( outbuf, &idx, sa->sa_id );
/* The assembly buffer is a source for encrypting data. The nonce is
* written in first followed by the packet payload. The whole
* contents of assembly are encrypted. */
pnonce = (uint32_t *)assembly;
*pnonce = rand();
memcpy( assembly + TRANSOP_TF_NONCE_SIZE, inbuf, in_len );
/* Encrypt the assembly contents and write the ciphertext after the SA. */
len = TwoFishEncryptRaw( assembly, /* source */
outbuf + TRANSOP_TF_VER_SIZE + TRANSOP_TF_SA_SIZE,
in_len + TRANSOP_TF_NONCE_SIZE, /* enc size */
sa->enc_tf);
if ( len > 0 ) len += TRANSOP_TF_VER_SIZE + TRANSOP_TF_SA_SIZE; /* size of data carried in UDP. */
else traceEvent( TRACE_ERROR, "encode_twofish encryption failed." );
} else traceEvent( TRACE_ERROR, "encode_twofish outbuf too small." );
} else traceEvent( TRACE_ERROR, "encode_twofish inbuf too big to encrypt." );
return len;
}
