static int
readYa( tr_handshake * handshake,
struct evbuffer * inbuf )
{
uint8_t ya[KEY_LEN];
uint8_t * walk, outbuf[KEY_LEN + PadB_MAXLEN];
const uint8_t *myKey, *secret;
int len;
dbgmsg( handshake, "in readYa... need %d, have %zu",
KEY_LEN, evbuffer_get_length( inbuf ) );
if( evbuffer_get_length( inbuf ) < KEY_LEN )
return READ_LATER;
/* read the incoming peer's public key */
evbuffer_remove( inbuf, ya, KEY_LEN );
secret = tr_cryptoComputeSecret( handshake->crypto, ya );
memcpy( handshake->mySecret, secret, KEY_LEN );
tr_sha1( handshake->myReq1, "req1", 4, secret, KEY_LEN, NULL );
dbgmsg( handshake, "sending B->A: Diffie Hellman Yb, PadB" );
/* send our public key to the peer */
walk = outbuf;
myKey = tr_cryptoGetMyPublicKey( handshake->crypto, &len );
memcpy( walk, myKey, len );
walk += len;
len = tr_cryptoRandInt( PadB_MAXLEN );
tr_cryptoRandBuf( walk, len );
walk += len;
setReadState( handshake, AWAITING_PAD_A );
tr_peerIoWriteBytes( handshake->io, outbuf, walk - outbuf, FALSE );
return READ_NOW;
}
static int
test_encrypt_decrypt (void)
{
tr_crypto a, b;
uint8_t hash[SHA_DIGEST_LENGTH];
const char test1[] = { "test1" };
char buf11[sizeof (test1)], buf12[sizeof (test1)];
const char test2[] = { "@#)C$@)#(*%bvkdjfhwbc039bc4603756VB3)" };
char buf21[sizeof (test2)], buf22[sizeof (test2)];
int i;
for (i = 0; i < SHA_DIGEST_LENGTH; ++i)
hash[i] = i;
tr_cryptoConstruct (&a, hash, false);
tr_cryptoConstruct (&b, hash, true);
tr_cryptoComputeSecret (&a, tr_cryptoGetMyPublicKey (&b, &i));
tr_cryptoComputeSecret (&b, tr_cryptoGetMyPublicKey (&a, &i));
tr_cryptoEncryptInit (&a);
tr_cryptoEncrypt (&a, sizeof (test1), test1, buf11);
tr_cryptoDecryptInit (&b);
tr_cryptoDecrypt (&b, sizeof (test1), buf11, buf12);
check_streq (test1, buf12);
tr_cryptoEncryptInit (&b);
tr_cryptoEncrypt (&b, sizeof (test2), test2, buf21);
tr_cryptoDecryptInit (&a);
tr_cryptoDecrypt (&a, sizeof (test2), buf21, buf22);
check_streq (test2, buf22);
tr_cryptoDestruct (&b);
tr_cryptoDestruct (&a);
return 0;
}
/* 1 A->B: Diffie Hellman Ya, PadA */
static void
sendYa( tr_handshake * handshake )
{
int len;
const uint8_t * public_key;
char outbuf[ KEY_LEN + PadA_MAXLEN ], *walk=outbuf;
/* add our public key (Ya) */
public_key = tr_cryptoGetMyPublicKey( handshake->crypto, &len );
assert( len == KEY_LEN );
assert( public_key );
memcpy( walk, public_key, len );
walk += len;
/* add some bullshit padding */
len = tr_cryptoRandInt( PadA_MAXLEN );
tr_cryptoRandBuf( walk, len );
walk += len;
/* send it */
setReadState( handshake, AWAITING_YB );
tr_peerIoWriteBytes( handshake->io, outbuf, walk - outbuf, FALSE );
}