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+.. hazmat::
+
+Constant time functions
+=======================
+
+.. currentmodule:: cryptography.hazmat.primitives.constant_time
+
+In order for cryptographic operations to not leak information through timing
+side channels, constant time operations need to be made available.
+
+.. function:: bytes_eq(a, b)
+
+    Compare ``a`` and ``b`` to one another in constant time.
+
+    .. doctest::
+
+        >>> from cryptography.hazmat.primitives import constant_time
+        >>> constant_time.bytes_eq(b"foo", b"foo")
+        True
+        >>> constant_time.bytes_eq(b"foo", b"bar")
+        False
+
+    :param a: ``bytes``.
+    :param b: ``bytes``.