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diff --git a/lib/Crypto/SelfTest/st_common.py b/lib/Crypto/SelfTest/st_common.py
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+++ b/lib/Crypto/SelfTest/st_common.py
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+# -*- coding: utf-8 -*-
+#
+#  SelfTest/st_common.py: Common functions for SelfTest modules
+#
+# Written in 2008 by Dwayne C. Litzenberger <dlitz@dlitz.net>
+#
+# ===================================================================
+# The contents of this file are dedicated to the public domain.  To
+# the extent that dedication to the public domain is not available,
+# everyone is granted a worldwide, perpetual, royalty-free,
+# non-exclusive license to exercise all rights associated with the
+# contents of this file for any purpose whatsoever.
+# No rights are reserved.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+# ===================================================================
+
+"""Common functions for SelfTest modules"""
+
+import unittest
+import binascii
+from Crypto.Util.py3compat import b
+
+
+def list_test_cases(class_):
+    """Return a list of TestCase instances given a TestCase class
+
+    This is useful when you have defined test* methods on your TestCase class.
+    """
+    return unittest.TestLoader().loadTestsFromTestCase(class_)
+
+def strip_whitespace(s):
+    """Remove whitespace from a text or byte string"""
+    if isinstance(s,str):
+        return b("".join(s.split()))
+    else:
+        return b("").join(s.split())
+
+def a2b_hex(s):
+    """Convert hexadecimal to binary, ignoring whitespace"""
+    return binascii.a2b_hex(strip_whitespace(s))
+
+def b2a_hex(s):
+    """Convert binary to hexadecimal"""
+    # For completeness
+    return binascii.b2a_hex(s)
+
+# vim:set ts=4 sw=4 sts=4 expandtab: