diff --git a/server-ca/blacklisting/import-factorable-blacklist.py b/server-ca/blacklisting/import-factorable-blacklist.py
new file mode 100644
index 000000000..6b87310c1
--- /dev/null
+++ b/server-ca/blacklisting/import-factorable-blacklist.py
@@ -0,0 +1,24 @@
+#!/usr/bin/env python
+
+# This imports the factorable moduli blacklist file into the
+# Redis set "factorable_moduli".  Specify one or more files on the
+# command line to import them.
+
+# E.g.,
+# python import-openssl-blacklist.py factorable_moduli.txt
+# will import everything.  This assumes that the input moduli are
+# already hexadecimal.  This script converts the moduli into the Debian
+# blacklist format before inserting them into Redis.
+
+import sys, redis, hashlib
+
+r = redis.Redis()
+
+for f in sys.argv[1:]:
+    for line in list(open(f)):
+        m = line.upper().strip()
+        m2 = m.lstrip("0")   # version without leading zeroes
+        h1 = hashlib.sha1("Modulus=%s\n" % m).hexdigest()[20:]
+        h2 = hashlib.sha1("Modulus=%s\n" % m2).hexdigest()[20:]
+        r.sadd("factorable_moduli", h1)
+        r.sadd("factorable_moduli", h2)