fix GIL issue

Author: picnixz

Modules/hmacmodule.c

@@ -498,28 +498,38 @@ _hacl_convert_errno(hacl_errno_t code, PyObject *algorithm)
             return 0;
         }
         case Hacl_Streaming_Types_InvalidAlgorithm: {
+            PyGILState_STATE gstate = PyGILState_Ensure();
             // only makes sense if an algorithm is known at call time
             assert(algorithm != NULL);
             assert(PyUnicode_CheckExact(algorithm));
             PyErr_Format(PyExc_ValueError, "invalid algorithm: %U", algorithm);
+            PyGILState_Release(gstate);
             return -1;
         }
         case Hacl_Streaming_Types_InvalidLength: {
+            PyGILState_STATE gstate = PyGILState_Ensure();
             PyErr_SetString(PyExc_ValueError, "invalid length");
+            PyGILState_Release(gstate);
             return -1;
         }
         case Hacl_Streaming_Types_MaximumLengthExceeded: {
+            PyGILState_STATE gstate = PyGILState_Ensure();
             PyErr_SetString(PyExc_OverflowError, "maximum length exceeded");
+            PyGILState_Release(gstate);
             return -1;
         }
         case Hacl_Streaming_Types_OutOfMemory: {
+            PyGILState_STATE gstate = PyGILState_Ensure();
             PyErr_NoMemory();
+            PyGILState_Release(gstate);
             return -1;
         }
         default: {
+            PyGILState_STATE gstate = PyGILState_Ensure();
             PyErr_Format(PyExc_RuntimeError,
                          "HACL* internal routine failed with error code: %d",
                          code);
+            PyGILState_Release(gstate);
             return -1;
         }
     }