diff --git a/tests/data_files/rsa522.key b/tests/data_files/rsa522.key
new file mode 100644
index 0000000..18fbe70
--- /dev/null
+++ b/tests/data_files/rsa522.key
@@ -0,0 +1,9 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIBPgIBAAJCAtMCdT492ij0L02fkshkdCDqb7yXwQ+EmLlmqVPzV2mNZYEGDf4y
+yKuY20vFzirN8MHm5ASnWhMoJVDBqjfTzci/AgMBAAECQU05ffxf7uVg74yC9tKg
+qCa746NpMh3OM+HZrUxiOXv0sJMRXNEPD5HNLtgcNY6MI5NYbUvkOXktnFZpxWYP
+TH7BAiEeFJGs5Z6gRd2v/IbYLMFDHgjqho04INGTOvnyI7lGVKUCIRgJM7moFuoM
+UrKTmJK1uOzauWEykCKgc6BGH6TGZoEWkwIhBzQn2v82qO1ydOYGKRk2w2sa+Yd1
+pH5/kkHqf+m8QjKdAiEQ9eVW+4J30wxD0JyX4b1E/S5UpN5KYNhWX0US+6D3NBsC
+IRxePzdQlutZWg0Cnku3QE1tOLBCFlP7QVVl5FbKcY5H5w==
+-----END RSA PRIVATE KEY-----