2 files changed, 48 insertions, 0 deletions
diff --git a/tests/hazmat/backends/test_openssl.py b/tests/hazmat/backends/test_openssl.py
index 4f682f66..43d28c33 100644
--- a/tests/hazmat/backends/test_openssl.py
+++ b/tests/hazmat/backends/test_openssl.py
@@ -233,6 +233,25 @@ class TestOpenSSLRandomEngine(object):
         e = backend._lib.ENGINE_get_default_RAND()
         assert e == backend._ffi.NULL
 
+    def test_int_to_bn(self):
+        value = (2 ** 4242) - 4242
+        bn = backend._int_to_bn(value)
+        assert bn != backend._ffi.NULL
+        bn = backend._ffi.gc(bn, backend._lib.BN_free)
+
+        assert bn
+        assert backend._bn_to_int(bn) == value
+
+    def test_int_to_bn_inplace(self):
+        value = (2 ** 4242) - 4242
+        bn_ptr = backend._lib.BN_new()
+        assert bn_ptr != backend._ffi.NULL
+        bn_ptr = backend._ffi.gc(bn_ptr, backend._lib.BN_free)
+        bn = backend._int_to_bn(value, bn_ptr)
+
+        assert bn == bn_ptr
+        assert backend._bn_to_int(bn_ptr) == value
+
 
 class TestOpenSSLRSA(object):
     @pytest.mark.skipif(
diff --git a/tests/hazmat/primitives/test_rsa.py b/tests/hazmat/primitives/test_rsa.py
index 4071c89a..84d0f805 100644
--- a/tests/hazmat/primitives/test_rsa.py
+++ b/tests/hazmat/primitives/test_rsa.py
@@ -642,6 +642,35 @@ class TestRSASignature(object):
             private_key.signer(padding.PSS(mgf=DummyMGF()), hashes.SHA1(),
                                backend)
 
+    def test_pkcs1_digest_too_large_for_key_size(self, backend):
+        private_key = rsa.RSAPrivateKey.generate(
+            public_exponent=65537,
+            key_size=599,
+            backend=backend
+        )
+        signer = private_key.signer(
+            padding.PKCS1v15(),
+            hashes.SHA512(),
+            backend
+        )
+        signer.update(b"failure coming")
+        with pytest.raises(ValueError):
+            signer.finalize()
+
+    def test_pkcs1_minimum_key_size(self, backend):
+        private_key = rsa.RSAPrivateKey.generate(
+            public_exponent=65537,
+            key_size=745,
+            backend=backend
+        )
+        signer = private_key.signer(
+            padding.PKCS1v15(),
+            hashes.SHA512(),
+            backend
+        )
+        signer.update(b"no failure")
+        signer.finalize()
+
 
 @pytest.mark.rsa
 class TestRSAVerification(object):