pubkey.c, ...: Support Bernstein's `X25519' key-agreement algorithm.

[catacomb-python] / pubkey.c

diff --git a/pubkey.c b/pubkey.c
index 4c4eb1d..50fa78c 100644 (file)
--- a/pubkey.c
+++ b/pubkey.c
@@ -120,7 +120,7 @@ static PyObject *dsameth_sign(PyObject *me, PyObject *arg, PyObject *kw)
 {
   gdsa_sig s = GDSA_SIG_INIT;
   char *p;
-  int n;
+  Py_ssize_t n;
   mp *k = 0;
   PyObject *rc = 0;
   char *kwlist[] = { "msg", "k", 0 };
@@ -140,7 +140,7 @@ end:
 static PyObject *dsameth_verify(PyObject *me, PyObject *arg)
 {
   char *p;
-  int n;
+  Py_ssize_t n;
   gdsa_sig s = GDSA_SIG_INIT;
   PyObject *rc = 0;
 
@@ -365,7 +365,7 @@ static PyObject *kcdsameth_sign(PyObject *me, PyObject *arg, PyObject *kw)
 {
   gkcdsa_sig s = GKCDSA_SIG_INIT;
   char *p;
-  int n;
+  Py_ssize_t n;
   mp *k = 0;
   PyObject *r = 0, *rc = 0;
   char *kwlist[] = { "msg", "k", 0 };
@@ -388,7 +388,7 @@ end:
 static PyObject *kcdsameth_verify(PyObject *me, PyObject *arg)
 {
   char *p;
-  int n, rn;
+  Py_ssize_t n, rn;
   gkcdsa_sig s = GKCDSA_SIG_INIT;
   PyObject *rc = 0;
 
@@ -865,7 +865,7 @@ static PyObject *meth__p1crypt_encode(PyObject *me,
 {
   pkcs1 p1;
   char *m, *ep;
-  int msz, epsz;
+  Py_ssize_t msz, epsz;
   unsigned long nbits;
   PyObject *rc = 0;
   octet *b = 0;
@@ -894,7 +894,7 @@ static PyObject *meth__p1crypt_decode(PyObject *me,
 {
   pkcs1 p1;
   char *ep;
-  int epsz;
+  Py_ssize_t epsz;
   unsigned long nbits;
   int n;
   PyObject *rc = 0;
@@ -926,7 +926,7 @@ static PyObject *meth__p1sig_encode(PyObject *me,
 {
   pkcs1 p1;
   char *m, *ep;
-  int msz, epsz;
+  Py_ssize_t msz, epsz;
   unsigned long nbits;
   PyObject *rc = 0;
   octet *b = 0;
@@ -955,7 +955,7 @@ static PyObject *meth__p1sig_decode(PyObject *me,
 {
   pkcs1 p1;
   char *ep;
-  int epsz;
+  Py_ssize_t epsz;
   unsigned long nbits;
   int n;
   PyObject *hukairz;
@@ -988,7 +988,7 @@ static PyObject *meth__oaep_encode(PyObject *me,
 {
   oaep o;
   char *m, *ep;
-  int msz, epsz;
+  Py_ssize_t msz, epsz;
   unsigned long nbits;
   PyObject *rc = 0;
   octet *b = 0;
@@ -1020,7 +1020,7 @@ static PyObject *meth__oaep_decode(PyObject *me,
 {
   oaep o;
   char *ep;
-  int epsz;
+  Py_ssize_t epsz;
   unsigned long nbits;
   int n;
   PyObject *rc = 0;
@@ -1055,7 +1055,7 @@ static PyObject *meth__pss_encode(PyObject *me,
 {
   pss p;
   char *m;
-  int msz;
+  Py_ssize_t msz;
   unsigned long nbits;
   PyObject *rc = 0;
   octet *b = 0;
@@ -1087,7 +1087,7 @@ static PyObject *meth__pss_decode(PyObject *me,
 {
   pss p;
   char *m;
-  int msz;
+  Py_ssize_t msz;
   unsigned long nbits;
   PyObject *rc = 0;
   octet *b = 0;
@@ -1118,6 +1118,24 @@ end:
   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[] = {
@@ -1132,6 +1150,8 @@ 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 }
 };