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-rw-r--r--rsa/_compat.py5
1 files changed, 5 insertions, 0 deletions
diff --git a/rsa/_compat.py b/rsa/_compat.py
index 7533c36..3c4eb81 100644
--- a/rsa/_compat.py
+++ b/rsa/_compat.py
@@ -76,6 +76,11 @@ except NameError:
bytes_type = str
+# To avoid calling b() multiple times in tight loops.
+ZERO_BYTE = b('\x00')
+EMPTY_BYTE = b('')
+
+
def is_bytes(obj):
"""
Determines whether the given value is a byte string.