diff --git a/tests/data_files/rsa512.key b/tests/data_files/rsa512.key
new file mode 100644
index 0000000..1fd7987
--- /dev/null
+++ b/tests/data_files/rsa512.key
@@ -0,0 +1,9 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIBOwIBAAJBALB20jJQgW+aqwIwfkUrl/DK51mDabQWJOivx5caWaE4kvZLB+qm
+7JKMFgstbsj50N1bY8izrAdntPZciS9WwQ8CAwEAAQJAKYfNcIoB7II6PQmsrhrU
+Z5dZW3fSKNANX7X/A1DwR0DlF8uZnpWsWbYcRoXX7QjvepZqc54wryhW55Wlm6yI
+AQIhAOJIaLjSpbHjzzcJQ7mylxn2WGIlbJPPzJ9OaFZCZQvxAiEAx6OEAvl6JKa6
+6a+N2Wvhtcgb4qqR6UHQGJQYGJz5nP8CIAvgoR6ScAAWZRoOcm+c4DGMrLb6H+ji
+T2tNQkzEz2kBAiEAmw34GStU36STpa6RGJ4+tyZN6jWakDVqf7x+HpfFE1cCIQDc
+KzXIxec2taye4OeIa1v4W/MigMmYE9w93Uw/Qi3azA==
+-----END RSA PRIVATE KEY-----
diff --git a/tests/data_files/rsa521.key b/tests/data_files/rsa521.key
new file mode 100644
index 0000000..0b940aa
--- /dev/null
+++ b/tests/data_files/rsa521.key
@@ -0,0 +1,9 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIBPQIBAAJCATG2mGDzy5v4XqNY/fK9KZDxt3qA1qT9+BekPdiWvffdJq+KwCN/
+Um4NM7EFyXH9vU/6ns6Z/EafMez0Kej1YsHDAgMBAAECQCdoYjwdMSHp4kksL5Aa
+0kDc58ni0chy9IgXo+FHjTVmR9DkaZANrwfVvYMJxqYCZo0im1Dw7ZJBUDJQNXnl
+ZokCIRiSk66I24AWa7XGUFvatVwXWi2ACE4QEKqzWQe1mQ24/wIhDHD1TCKpqucA
+XDI+1N7EHs+fN4CfTSWe8FPGiK6q3VM9AiESrKKLi/q011U4KeS8SfR2blDcL2cg
+XFkuQWqxzzLoGOUCIQmgl5E0+Ypwe0zc7NYZFDarf4+ZjqxKQnXCvk0irMHcGQIh
+EVPli6RQb3Gcx7vXJHltzSTno7NElzBDRMBVUlBmVxAJ
+-----END RSA PRIVATE KEY-----
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-----
diff --git a/tests/data_files/rsa528.key b/tests/data_files/rsa528.key
new file mode 100644
index 0000000..fd463b5
--- /dev/null
+++ b/tests/data_files/rsa528.key
@@ -0,0 +1,9 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIBRQIBAAJDAOMcJG1GSFmEJh/RdMqz1DVzRGAuzXk8R9vlQlLTe7NQvGNDWbGV
+FVQggORySktnIpG+V8dkj1Finq7yNOhH2ZzGXwIDAQABAkMAsWYyLglQSlwnS4NZ
+L1z4zieTqW3lomWr2+BgxkHbxl2w0Rx4L+Ezp+YK6mhtIQWNkoytPvWJJMS7Jrkg
+agMAHQJBAiIA+F1y5GO0Bv+igsNLXwwtbCqs8hAkavU9W8egt/oDbhzbAiIA6hds
+PZp/s1X7n7dwfmebSs+3vLZFuQfifN8XZLw0CXHNAiEuEzgDQrPdMIN3er96zImI
+rYoUBgabiQ9u/WPFfa4xOU0CIgDDYC089Tfjy72pPgcr2PkpZVhqro5esg/8PI5f
+yxx7TXkCIgCYoE8Y5IxomtL1ub1AQzPe9UyyUGzQB1yWeiloJh6LjxA=
+-----END RSA PRIVATE KEY-----