To utilize "EVP_PKEY" and "X509" created in C or Pyx code within Python code that calls the C program, you can follow the below steps:

1. Create a C function that generates the "EVP_PKEY" and "X509" objects and exports them to Python using the CPython API.

2. Compile the C code to generate a shared library (.so) file.

3. Use the ctypes module in Python to load the shared library and access the C functions.

4. Call the C function that generates the "EVP_PKEY" and "X509" objects from Python using ctypes.

5. Once you have the "EVP_PKEY" and "X509" objects in Python, you can use them as you would use any other Python object.

Here is an example code snippet that demonstrates the process:

// C code to generate EVP_PKEY and X509 objects and export them to Python

include <openssl evp.h="">

include <openssl x509.h="">

include <python.h>

static PyObject * generateevpandx509(PyObject *self, PyObject *args) { EVPPKEY *pkey = NULL; X509 *x509 = NULL;

// Generate EVP_PKEY and X509 objects using OpenSSL APIs
// ...

// Export EVP_PKEY and X509 objects to Python
PyObject *pkey_obj = PyCapsule_New(pkey, "EVP_PKEY", NULL);
PyObject *x509_obj = PyCapsule_New(x509, "X509", NULL);

PyObject *result = PyTuple_New(2);
PyTuple_SetItem(result, 0, pkey_obj);
PyTuple_SetItem(result, 1, x509_obj);

return result;

}

static PyMethodDef methods[] = { {"generateevpandx509", generateevpandx509, METHVARARGS, "Generate EVPPKEY and X509 objects and export them to Python"}, {NULL, NULL, 0, NULL} };

static struct PyModuleDef module = { PyModuleDefHEADINIT, "my_module", NULL, -1, methods };

PyMODINITFUNC PyInitmymodule(void) { return PyModuleCreate(&module); }

Python code to load the shared library and call the C function

import ctypes

mylib = ctypes.cdll.LoadLibrary('./mylib.so')

Call the C function that generates EVP_PKEY and X509 objects

result = mylib.generateevpandx509()

Retrieve the EVP_PKEY and X509 objects from the result tuple

pkeyobj = result[0] x509obj = result[1]

Convert the EVP_PKEY and X509 objects to their corresponding C structs

pkeyptr = ctypes.cast(pkeyobj, ctypes.POINTER(ctypes.cvoidp)).contents.value pkey = ctypes.cast(pkeyptr, ctypes.POINTER(EVPPKEY)).contents

x509ptr = ctypes.cast(x509obj, ctypes.POINTER(ctypes.cvoidp)).contents.value x509 = ctypes.cast(x509_ptr, ctypes.POINTER(X509)).contents

Use the EVP_PKEY and X509 objects as required

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