Index: Modules/hashlib.h
===================================================================
--- Modules/hashlib.h	(Revision 76449)
+++ Modules/hashlib.h	(Arbeitskopie)
@@ -11,18 +11,24 @@
                             "Unicode-objects must be encoded before hashing");\
             return error_return; \
         } \
-        if (!PyObject_CheckBuffer((obj))) { \
+        if (PyObject_CheckBuffer((obj))) { \
+            if (PyObject_GetBuffer((obj), (viewp), PyBUF_SIMPLE) == -1) { \
+                return error_return; \
+            } \
+            if ((viewp)->ndim > 1) { \
+                PyErr_SetString(PyExc_BufferError, \
+                                "Buffer must be single dimension"); \
+                PyBuffer_Release((viewp)); \
+                return error_return; \
+            } \
+        } else if ((obj)->ob_type->tp_as_buffer && \
+                   (obj)->ob_type->tp_as_buffer->bf_getreadbuffer && \
+                   (obj)->ob_type->tp_as_buffer->bf_getsegcount && \
+		   ((obj)->ob_type->tp_as_buffer->bf_getsegcount)((obj), NULL) == 1) { \
+	  view.len = ((obj)->ob_type->tp_as_buffer->bf_getreadbuffer)((obj), 0, &view.buf); \
+	} else { \
             PyErr_SetString(PyExc_TypeError, \
                             "object supporting the buffer API required"); \
             return error_return; \
         } \
-        if (PyObject_GetBuffer((obj), (viewp), PyBUF_SIMPLE) == -1) { \
-            return error_return; \
-        } \
-        if ((viewp)->ndim > 1) { \
-            PyErr_SetString(PyExc_BufferError, \
-                            "Buffer must be single dimension"); \
-            PyBuffer_Release((viewp)); \
-            return error_return; \
-        } \
     } while(0);