From e50ac707316ea6d8059f7036322450727773952d Mon Sep 17 00:00:00 2001
From: Mark Haines <mjark@negativecurvature.net>
Date: Thu, 26 Feb 2015 16:40:56 +0000
Subject: Squashed 'lib/curve25519-donna/' content from commit 28772f3

git-subtree-dir: lib/curve25519-donna
git-subtree-split: 28772f37a4b8a57ab9439b9e79b19f9abee686da
---
 python-src/curve25519/curve25519module.c | 105 +++++++++++++++++++++++++++++++
 1 file changed, 105 insertions(+)
 create mode 100644 python-src/curve25519/curve25519module.c

(limited to 'python-src/curve25519/curve25519module.c')

diff --git a/python-src/curve25519/curve25519module.c b/python-src/curve25519/curve25519module.c
new file mode 100644
index 0000000..e309ec0
--- /dev/null
+++ b/python-src/curve25519/curve25519module.c
@@ -0,0 +1,105 @@
+/* tell python that PyArg_ParseTuple(t#) means Py_ssize_t, not int */
+#define PY_SSIZE_T_CLEAN
+#include <Python.h>
+#if (PY_VERSION_HEX < 0x02050000)
+	typedef int Py_ssize_t;
+#endif
+
+/* This is required for compatibility with Python 2. */
+#if PY_MAJOR_VERSION >= 3
+	#include <bytesobject.h> 
+	#define y "y"
+#else
+	#define PyBytes_FromStringAndSize PyString_FromStringAndSize
+	#define y "t"
+#endif
+
+int curve25519_donna(char *mypublic, 
+                     const char *secret, const char *basepoint);
+
+static PyObject *
+pycurve25519_makeprivate(PyObject *self, PyObject *args)
+{
+    char *in1;
+    Py_ssize_t in1len;
+    if (!PyArg_ParseTuple(args, y"#:clamp", &in1, &in1len))
+        return NULL;
+    if (in1len != 32) {
+        PyErr_SetString(PyExc_ValueError, "input must be 32-byte string");
+        return NULL;
+    }
+    in1[0] &= 248;
+    in1[31] &= 127;
+    in1[31] |= 64;
+    return PyBytes_FromStringAndSize((char *)in1, 32);
+}
+
+static PyObject *
+pycurve25519_makepublic(PyObject *self, PyObject *args)
+{
+    const char *private;
+    char mypublic[32];
+    char basepoint[32] = {9};
+    Py_ssize_t privatelen;
+    if (!PyArg_ParseTuple(args, y"#:makepublic", &private, &privatelen))
+        return NULL;
+    if (privatelen != 32) {
+        PyErr_SetString(PyExc_ValueError, "input must be 32-byte string");
+        return NULL;
+    }
+    curve25519_donna(mypublic, private, basepoint);
+    return PyBytes_FromStringAndSize((char *)mypublic, 32);
+}
+
+static PyObject *
+pycurve25519_makeshared(PyObject *self, PyObject *args)
+{
+    const char *myprivate, *theirpublic;
+    char shared_key[32];
+    Py_ssize_t myprivatelen, theirpubliclen;
+    if (!PyArg_ParseTuple(args, y"#"y"#:generate",
+                          &myprivate, &myprivatelen, &theirpublic, &theirpubliclen))
+        return NULL;
+    if (myprivatelen != 32) {
+        PyErr_SetString(PyExc_ValueError, "input must be 32-byte string");
+        return NULL;
+    }
+    if (theirpubliclen != 32) {
+        PyErr_SetString(PyExc_ValueError, "input must be 32-byte string");
+        return NULL;
+    }
+    curve25519_donna(shared_key, myprivate, theirpublic);
+    return PyBytes_FromStringAndSize((char *)shared_key, 32);
+}
+
+
+static PyMethodDef
+curve25519_functions[] = {
+    {"make_private", pycurve25519_makeprivate, METH_VARARGS, "data->private"},
+    {"make_public", pycurve25519_makepublic, METH_VARARGS, "private->public"},
+    {"make_shared", pycurve25519_makeshared, METH_VARARGS, "private+public->shared"},
+    {NULL, NULL, 0, NULL},
+};
+
+#if PY_MAJOR_VERSION >= 3
+    static struct PyModuleDef
+    curve25519_module = {
+        PyModuleDef_HEAD_INIT,
+        "_curve25519",
+        NULL,
+        NULL,
+        curve25519_functions,
+    };
+
+    PyObject *
+    PyInit__curve25519(void)
+    {
+        return PyModule_Create(&curve25519_module);
+    }
+#else
+    PyMODINIT_FUNC
+    init_curve25519(void)
+    {
+          (void)Py_InitModule("_curve25519", curve25519_functions);
+    }
+#endif
\ No newline at end of file
-- 
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