C(KF_NONSECRET),
C(KF_BURN), C(KF_OPT),
C(EC_XONLY), C(EC_YBIT), C(EC_LSB), C(EC_CMPR), C(EC_EXPLY), C(EC_SORT),
+ C(X25519_KEYSZ), C(X25519_PUBSZ), C(X25519_OUTSZ),
#define ENTRY(tag, val, str) C(KERR_##tag),
KEY_ERRORS(ENTRY)
#undef ENTRY
def sign(me, msg, enc): return me.privop(enc.encode(msg, me.n.nbits))
_augment(RSAPriv, _tmp)
+###--------------------------------------------------------------------------
+### Bernstein's elliptic curve crypto.
+
+X25519_BASE = \
+ bytes('0900000000000000000000000000000000000000000000000000000000000000')
+
+Z128 = bytes('00000000000000000000000000000000')
+
+class _BoxyPub (object):
+ def __init__(me, pub, *kw, **kwargs):
+ if len(pub) != me._PUBSZ: raise ValueError, 'bad public key'
+ super(_BoxyPub, me).__init__(*kw, **kwargs)
+ me.pub = pub
+
+class _BoxyPriv (_BoxyPub):
+ def __init__(me, priv, pub = None, *kw, **kwargs):
+ if len(priv) != me._KEYSZ: raise ValueError, 'bad private key'
+ if pub is None: pub = me._op(priv, me._BASE)
+ super(_BoxyPriv, me).__init__(pub = pub, *kw, **kwargs)
+ me.priv = priv
+ def agree(me, you): return me._op(me.priv, you.pub)
+ def boxkey(me, recip):
+ return me._hashkey(me.agree(recip))
+ def box(me, recip, n, m):
+ return secret_box(me.boxkey(recip), n, m)
+ def unbox(me, recip, n, c):
+ return secret_unbox(me.boxkey(recip, n, c))
+
+class X25519Pub (_BoxyPub):
+ _PUBSZ = X25519_PUBSZ
+ _BASE = X25519_BASE
+
+class X25519Priv (_BoxyPriv, X25519Pub):
+ _KEYSZ = X25519_KEYSZ
+ def _op(me, k, X): return x25519(k, X)
+ def _hashkey(me, z): return hsalsa20_prf(z, Z128)
+
###--------------------------------------------------------------------------
### Built-in named curves and prime groups.
return (rc);
}
+/*----- X25519 ------------------------------------------------------------*/
+
+static PyObject *meth_x25519(PyObject *me, PyObject *arg)
+{
+ const char *k, *p;
+ Py_ssize_t ksz, psz;
+ PyObject *rc = 0;
+ if (!PyArg_ParseTuple(arg, "s#s#:x25519", &k, &ksz, &p, &psz)) goto end;
+ if (ksz != X25519_KEYSZ) VALERR("bad key length");
+ if (psz != X25519_PUBSZ) VALERR("bad public length");
+ rc = bytestring_pywrap(0, X25519_OUTSZ);
+ x25519((octet *)PyString_AS_STRING(rc),
+ (const octet *)k, (const octet *)p);
+ return (rc);
+end:
+ return (0);
+}
+
/*----- Global stuff ------------------------------------------------------*/
static PyMethodDef methods[] = {
KWMETH(_pss_decode, 0)
KWMETH(_RSAPriv_generate, "\
generate(NBITS, [event = pgen_nullev, rng = rand, nsteps = 0]) -> R")
+ METH (x25519, "\
+x25519(KEY, PUBLIC) -> SHARED")
#undef METHNAME
{ 0 }
};