add tests got PKCS1-PKCS8 RSA private key encoding

Author: mattsb42-aws

tests/algorithms/test_RSA.py

@@ -1,9 +1,11 @@
+import base64
 import sys
 
 try:
     from jose.backends.rsa_backend import RSAKey as PurePythonRSAKey
+    from jose.backends import rsa_backend
 except ImportError:
-    PurePythonRSAKey = None
+    PurePythonRSAKey = rsa_backend = None
 
 try:
     from Crypto.PublicKey import RSA as PyCryptoRSA
@@ -165,12 +167,125 @@
 -----END PRIVATE KEY-----
 """
 
+PKCS8_PRIVATE_KEY = b"""MIIJRQIBADANBgkqhkiG9w0BAQEFAASCCS8wggkrAg
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+PKCS1_PRIVATE_KEY = b"""MIIJKwIBAAKCAgEAtSKfSeI0fukRIX38AHlKB1YPp
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+
 
 @pytest.mark.skipif(PurePythonRSAKey is None, reason="python-rsa backend not available")
-def test_python_rsa_legacy_pem_read():
-    key = PurePythonRSAKey(LEGACY_INVALID_PRIVATE_KEY_PKCS8_PEM, ALGORITHMS.RS256)
-    new_pem = key.to_pem(pem_format="PKCS8")
-    assert new_pem != LEGACY_INVALID_PRIVATE_KEY_PKCS8_PEM
+class TestPurePythonRsa(object):
+    def test_python_rsa_legacy_pem_read(self):
+        key = PurePythonRSAKey(LEGACY_INVALID_PRIVATE_KEY_PKCS8_PEM, ALGORITHMS.RS256)
+        new_pem = key.to_pem(pem_format="PKCS8")
+        assert new_pem != LEGACY_INVALID_PRIVATE_KEY_PKCS8_PEM
+
+    def test_python_rsa_private_key_pkcs1_to_pkcs8(self):
+        pkcs1 = base64.b64decode(PKCS1_PRIVATE_KEY)
+        pkcs8 = base64.b64decode(PKCS8_PRIVATE_KEY)
+
+        assert rsa_backend._private_key_pkcs1_to_pkcs8(pkcs1) == pkcs8
+
+    def test_python_rsa_private_key_pkcs8_to_pkcs1(self):
+        pkcs1 = base64.b64decode(PKCS1_PRIVATE_KEY)
+        pkcs8 = base64.b64decode(PKCS8_PRIVATE_KEY)
+
+        assert rsa_backend._private_key_pkcs8_to_pkcs1(pkcs8) == pkcs1
 
 
 @pytest.mark.pycrypto