379 lines
11 KiB
C
379 lines
11 KiB
C
#define PY_SSIZE_T_CLEAN
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#include <Python.h>
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#include "c_kzg_4844.h"
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static void free_BLSFieldElement(PyObject *c) {
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free(PyCapsule_GetPointer(c, "BLSFieldElement"));
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}
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static void free_G1(PyObject *c) {
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free(PyCapsule_GetPointer(c, "G1"));
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}
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static void free_PolynomialEvalForm(PyObject *c) {
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PolynomialEvalForm *p = PyCapsule_GetPointer(c, "PolynomialEvalForm");
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free_polynomial(p);
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free(p);
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}
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static void free_KZGSettings(PyObject *c) {
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KZGSettings *s = PyCapsule_GetPointer(c, "KZGSettings");
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free_trusted_setup(s);
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free(s);
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}
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static PyObject* bytes_to_bls_field_wrap(PyObject *self, PyObject *args) {
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PyBytesObject *pybytes;
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if (!PyArg_ParseTuple(args, "S", &pybytes) ||
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PyBytes_Size((PyObject*)pybytes) != 32)
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return PyErr_Format(PyExc_ValueError, "expected 32 bytes");
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BLSFieldElement *out = (BLSFieldElement*)malloc(sizeof(BLSFieldElement));
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if (out == NULL) return PyErr_NoMemory();
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bytes_to_bls_field(out, (const uint8_t*)PyBytes_AsString((PyObject*)pybytes));
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return PyCapsule_New(out, "BLSFieldElement", free_BLSFieldElement);
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}
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static PyObject* int_from_bls_field(PyObject *self, PyObject *args) {
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PyObject *c;
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if (!PyArg_UnpackTuple(args, "uint64s_from_BLSFieldElement", 1, 1, &c) ||
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!PyCapsule_IsValid(c, "BLSFieldElement"))
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return PyErr_Format(PyExc_ValueError, "expected a BLSFieldElement capsule");
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uint64_t u[4];
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uint64s_from_BLSFieldElement(u, PyCapsule_GetPointer(c, PyCapsule_GetName(c)));
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PyObject *out = PyLong_FromUnsignedLong(0);
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PyObject *mult = PyLong_FromUnsignedLong(1);
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PyObject *two64 = PyNumber_Power(PyLong_FromUnsignedLong(2), PyLong_FromUnsignedLong(64), Py_None);
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for (int i = 0; i < 4; i++) {
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out = PyNumber_Add(out, PyNumber_Multiply(mult, PyLong_FromUnsignedLong(u[i])));
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mult = PyNumber_Multiply(mult, two64);
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}
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return out;
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}
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static PyObject* alloc_polynomial_wrap(PyObject *self, PyObject *args) {
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PyObject *a;
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if (!PyArg_UnpackTuple(args, "alloc_polynomial_wrap", 1, 1, &a) ||
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!PySequence_Check(a))
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return PyErr_Format(PyExc_ValueError, "expected sequence");
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PolynomialEvalForm *p = (PolynomialEvalForm*)malloc(sizeof(PolynomialEvalForm));
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if (p == NULL) return PyErr_NoMemory();
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Py_ssize_t n = PySequence_Length(a);
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p->length = n;
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if (alloc_polynomial(p, n) != C_KZG_OK)
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return PyErr_Format(PyExc_RuntimeError, "error allocating polynomial");
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PyObject *e;
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for (Py_ssize_t i = 0; i < n; i++) {
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e = PySequence_GetItem(a, i);
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if (!PyCapsule_IsValid(e, "BLSFieldElement")) {
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free_polynomial(p);
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free(p);
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return PyErr_Format(PyExc_ValueError, "expected BLSFieldElement capsules");
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}
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p->values[i] = *(BLSFieldElement*)PyCapsule_GetPointer(e, "BLSFieldElement");
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}
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return PyCapsule_New(p, "PolynomialEvalForm", free_PolynomialEvalForm);
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}
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static PyObject* bytes_from_g1_wrap(PyObject *self, PyObject *args) {
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PyObject *c;
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if (!PyArg_UnpackTuple(args, "bytes_from_g1", 1, 1, &c) ||
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!PyCapsule_IsValid(c, "G1"))
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return PyErr_Format(PyExc_ValueError, "expected G1 capsule");
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uint8_t bytes[48];
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bytes_from_g1(bytes, PyCapsule_GetPointer(c, "G1"));
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return PyBytes_FromStringAndSize((char*)bytes, 48);
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}
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static PyObject* compute_powers_wrap(PyObject *self, PyObject *args) {
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PyObject *c;
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PyObject *n;
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if (!PyArg_UnpackTuple(args, "compute_powers", 2, 2, &c, &n) ||
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!PyCapsule_IsValid(c, "BLSFieldElement") ||
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!PyLong_Check(n))
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return PyErr_Format(PyExc_ValueError, "expected a BLSFieldElement capsule and a number");
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Py_ssize_t z = PyLong_AsSsize_t(n);
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PyObject *out = PyList_New(z);
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if (out == NULL) return PyErr_NoMemory();
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BLSFieldElement *a = (BLSFieldElement*)calloc(z, sizeof(BLSFieldElement));
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if (a == NULL) return PyErr_NoMemory();
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compute_powers(a, PyCapsule_GetPointer(c, "BLSFieldElement"), z);
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BLSFieldElement *f;
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for (Py_ssize_t i = 0; i < z; i++) {
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f = (BLSFieldElement*)malloc(sizeof(BLSFieldElement));
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if (f == NULL) {
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free(a);
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return PyErr_NoMemory();
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}
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*f = a[i];
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PyList_SetItem(out, i, PyCapsule_New(f, "BLSFieldElement", free_BLSFieldElement));
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}
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free(a);
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return out;
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}
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static PyObject* load_trusted_setup_wrap(PyObject *self, PyObject *args) {
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PyObject *f;
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if (!PyArg_ParseTuple(args, "U", &f))
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return PyErr_Format(PyExc_ValueError, "expected a string");
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KZGSettings *s = (KZGSettings*)malloc(sizeof(KZGSettings));
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if (s == NULL) return PyErr_NoMemory();
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if (load_trusted_setup(s, fopen(PyUnicode_AsUTF8(f), "r")) != C_KZG_OK)
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return PyErr_Format(PyExc_RuntimeError, "error loading trusted setup");
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return PyCapsule_New(s, "KZGSettings", free_KZGSettings);
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}
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static PyObject* blob_to_kzg_commitment_wrap(PyObject *self, PyObject *args) {
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PyObject *a;
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PyObject *c;
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if (!PyArg_UnpackTuple(args, "alloc_polynomial_wrap", 2, 2, &a, &c) ||
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!PySequence_Check(a) ||
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!PyCapsule_IsValid(c, "KZGSettings"))
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return PyErr_Format(PyExc_ValueError, "expected sequence and trusted setup");
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Py_ssize_t n = PySequence_Length(a);
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BLSFieldElement *blob = (BLSFieldElement*)calloc(n, sizeof(BLSFieldElement));
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if (blob == NULL) return PyErr_NoMemory();
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PyObject *e;
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for (Py_ssize_t i = 0; i < n; i++) {
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e = PySequence_GetItem(a, i);
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if (!PyCapsule_IsValid(e, "BLSFieldElement")) {
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free(blob);
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return PyErr_Format(PyExc_ValueError, "expected BLSFieldElement capsules");
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}
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// TODO: could avoid copying if blob_to_kzg_commitment expected pointers instead of an array
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blob[i] = *(BLSFieldElement*)PyCapsule_GetPointer(e, "BLSFieldElement");
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}
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KZGCommitment *k = (KZGCommitment*)malloc(sizeof(KZGCommitment));
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if (k == NULL) return PyErr_NoMemory();
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blob_to_kzg_commitment(k, blob, PyCapsule_GetPointer(c, "KZGSettings"));
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free(blob);
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return PyCapsule_New(k, "G1", free_G1);
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}
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static PyObject* vector_lincomb_wrap(PyObject *self, PyObject *args) {
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PyObject *vs;
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PyObject *fs;
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if (!PyArg_UnpackTuple(args, "vector_lincomb", 2, 2, &vs, &fs) ||
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!PySequence_Check(vs) ||
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!PySequence_Check(fs))
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return PyErr_Format(PyExc_ValueError, "expected two sequences");
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Py_ssize_t n = PySequence_Length(vs);
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if (PySequence_Length(fs) != n)
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return PyErr_Format(PyExc_ValueError, "expected same-length sequences");
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if (n == 0) { return fs; }
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if (!PySequence_Check(PySequence_GetItem(vs, 0)))
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return PyErr_Format(PyExc_ValueError, "expected sequence of sequences");
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Py_ssize_t i, j, m = PySequence_Length(PySequence_GetItem(vs, 0));
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const BLSFieldElement* *vectors = (const BLSFieldElement**)calloc(n * m, sizeof(BLSFieldElement*));
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if (vectors == NULL) return PyErr_NoMemory();
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PyObject *tmp, *out;
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for (i = 0; i < n; i++) {
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if (!PySequence_Check(PySequence_GetItem(vs, i))) {
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free(vectors);
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return PyErr_Format(PyExc_ValueError, "expected sequence of sequences");
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}
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tmp = PySequence_GetItem(vs, i);
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if (PySequence_Length(tmp) != m) {
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free(vectors);
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return PyErr_Format(PyExc_ValueError, "expected vectors of same length");
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}
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for (j = 0; j < m; j++) {
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out = PySequence_GetItem(tmp, j);
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if (!PyCapsule_IsValid(out, "BLSFieldElement")) {
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free(vectors);
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return PyErr_Format(PyExc_ValueError, "expected vectors of BLSFieldElement capsules");
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}
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vectors[i * m + j] = (BLSFieldElement*)PyCapsule_GetPointer(out, "BLSFieldElement");
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}
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}
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const BLSFieldElement* *scalars = (const BLSFieldElement**)calloc(n, sizeof(BLSFieldElement*));
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if (scalars == NULL) {
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free(vectors);
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return PyErr_NoMemory();
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}
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for (i = 0; i < n; i++) {
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tmp = PySequence_GetItem(fs, i);
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if (!PyCapsule_IsValid(tmp, "BLSFieldElement")) {
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free(scalars);
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free(vectors);
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return PyErr_Format(PyExc_ValueError, "expected a BLSFieldElement capsule");
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}
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scalars[i] = (BLSFieldElement*)PyCapsule_GetPointer(tmp, "BLSFieldElement");
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}
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BLSFieldElement *r = (BLSFieldElement*)calloc(m, sizeof(BLSFieldElement));
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if (r == NULL) {
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free(scalars);
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free(vectors);
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return PyErr_NoMemory();
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}
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vector_lincomb(r, vectors, scalars, n, m);
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free(scalars);
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free(vectors);
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out = PyList_New(m);
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if (out == NULL) {
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free(r);
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return PyErr_NoMemory();
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}
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BLSFieldElement *f;
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for (j = 0; j < m; j++) {
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f = (BLSFieldElement*)malloc(sizeof(BLSFieldElement));
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if (f == NULL) {
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free(r);
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return PyErr_NoMemory();
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}
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*f = r[j];
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PyList_SetItem(out, j, PyCapsule_New(f, "BLSFieldElement", free_BLSFieldElement));
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}
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free(r);
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return out;
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}
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static PyObject* g1_lincomb_wrap(PyObject *self, PyObject *args) {
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PyObject *gs, *fs;
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if (!PyArg_UnpackTuple(args, "g1_lincomb", 2, 2, &gs, &fs) ||
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!PySequence_Check(gs) ||
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!PySequence_Check(fs) ||
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PySequence_Length(gs) != PySequence_Length(fs))
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return PyErr_Format(PyExc_ValueError, "expected same-length sequences");
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Py_ssize_t i, n = PySequence_Length(gs);
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KZGCommitment *k = (KZGCommitment*)malloc(sizeof(KZGCommitment));
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if (k == NULL) return PyErr_NoMemory();
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KZGCommitment* points = (KZGCommitment*)calloc(n, sizeof(KZGCommitment));
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if (points == NULL) {
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free(k);
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return PyErr_NoMemory();
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}
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BLSFieldElement* scalars = (BLSFieldElement*)calloc(n, sizeof(BLSFieldElement));
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if (scalars == NULL) {
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free(points);
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free(k);
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return PyErr_NoMemory();
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}
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PyObject *tmp;
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// TODO: could avoid copying if g1_lincomb expected pointers
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for (i = 0; i < n; i++) {
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tmp = PySequence_GetItem(gs, i);
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if (!PyCapsule_IsValid(tmp, "G1")) {
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free(scalars); free(points); free(k);
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return PyErr_Format(PyExc_ValueError, "expected group elements");
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}
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points[i] = *(KZGCommitment*)(PyCapsule_GetPointer(tmp, "G1"));
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tmp = PySequence_GetItem(fs, i);
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if (!PyCapsule_IsValid(tmp, "BLSFieldElement")) {
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free(scalars); free(points); free(k);
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return PyErr_Format(PyExc_ValueError, "expected field elements");
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}
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scalars[i] = *(BLSFieldElement*)(PyCapsule_GetPointer(tmp, "BLSFieldElement"));
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}
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g1_lincomb(k, points, scalars, n);
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free(scalars);
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free(points);
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return PyCapsule_New(k, "G1", free_G1);
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}
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static PyMethodDef ckzgmethods[] = {
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{"bytes_from_g1", bytes_from_g1_wrap, METH_VARARGS, "Convert a group element to 48 bytes"},
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{"int_from_bls_field", int_from_bls_field, METH_VARARGS, "Convert a field element to a 256-bit int"},
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{"bytes_to_bls_field", bytes_to_bls_field_wrap, METH_VARARGS, "Convert 32 bytes to a field element"},
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{"alloc_polynomial", alloc_polynomial_wrap, METH_VARARGS, "Create a PolynomialEvalForm from a sequence of field elements"},
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{"load_trusted_setup", load_trusted_setup_wrap, METH_VARARGS, "Load trusted setup from file path"},
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{"blob_to_kzg_commitment", blob_to_kzg_commitment_wrap, METH_VARARGS, "Create a commitment from a sequence of field elements"},
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{"compute_powers", compute_powers_wrap, METH_VARARGS, "Create a list of powers of a field element"},
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{"vector_lincomb", vector_lincomb_wrap, METH_VARARGS, "Multiply a matrix of field elements with a vector"},
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{"g1_lincomb", g1_lincomb_wrap, METH_VARARGS, "Linear combination of group elements with field elements"},
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{NULL, NULL, 0, NULL}
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};
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static struct PyModuleDef ckzg = {
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PyModuleDef_HEAD_INIT,
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"ckzg",
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NULL,
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-1,
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ckzgmethods
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};
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PyMODINIT_FUNC PyInit_ckzg(void) {
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return PyModule_Create(&ckzg);
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}
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