diff options
Diffstat (limited to 'networking/tls_fe.c')
| -rw-r--r-- | networking/tls_fe.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/networking/tls_fe.c b/networking/tls_fe.c index f810e11..3b3578c 100644 --- a/networking/tls_fe.c +++ b/networking/tls_fe.c @@ -544,7 +544,7 @@ static void xc_double(byte *x3, byte *z3, fe_mul_c(z3, x1sq, 4); } -void FAST_FUNC curve25519(byte *result, const byte *e, const byte *q) +static void curve25519(byte *result, const byte *e, const byte *q) { int i; @@ -599,3 +599,24 @@ void FAST_FUNC curve25519(byte *result, const byte *e, const byte *q) fe_mul__distinct(result, zm1, xm); fe_normalize(result); } + +/* interface to bbox's TLS code: */ + +void FAST_FUNC curve_x25519_compute_pubkey_and_premaster( + uint8_t *pubkey, uint8_t *premaster, + const uint8_t *peerkey32) +{ + static const uint8_t basepoint9[CURVE25519_KEYSIZE] ALIGN8 = {9}; + uint8_t privkey[CURVE25519_KEYSIZE]; //[32] + + /* Generate random private key, see RFC 7748 */ + tls_get_random(privkey, sizeof(privkey)); + privkey[0] &= 0xf8; + privkey[CURVE25519_KEYSIZE-1] = ((privkey[CURVE25519_KEYSIZE-1] & 0x7f) | 0x40); + + /* Compute public key */ + curve25519(pubkey, privkey, basepoint9); + + /* Compute premaster using peer's public key */ + curve25519(premaster, privkey, peerkey32); +} |