1 files changed, 127 insertions, 0 deletions
diff --git a/tests/hazmat/primitives/utils.py b/tests/hazmat/primitives/utils.py
new file mode 100644
index 00000000..79d0aba4
--- /dev/null
+++ b/tests/hazmat/primitives/utils.py
@@ -0,0 +1,127 @@
+import binascii
+import os
+
+import pytest
+
+from cryptography.bindings import _ALL_BACKENDS
+from cryptography.hazmat.primitives.block import BlockCipher
+
+
+def generate_encrypt_test(param_loader, path, file_names, cipher_factory,
+                          mode_factory, only_if=lambda backend: True,
+                          skip_message=None):
+    def test_encryption(self):
+        for backend in _ALL_BACKENDS:
+            for file_name in file_names:
+                for params in param_loader(os.path.join(path, file_name)):
+                    yield (
+                        encrypt_test,
+                        backend,
+                        cipher_factory,
+                        mode_factory,
+                        params,
+                        only_if,
+                        skip_message
+                    )
+    return test_encryption
+
+
+def encrypt_test(backend, cipher_factory, mode_factory, params, only_if,
+                 skip_message):
+    if not only_if(backend):
+        pytest.skip(skip_message)
+    plaintext = params.pop("plaintext")
+    ciphertext = params.pop("ciphertext")
+    cipher = BlockCipher(
+        cipher_factory(**params),
+        mode_factory(**params),
+        backend
+    )
+    encryptor = cipher.encryptor()
+    actual_ciphertext = encryptor.update(binascii.unhexlify(plaintext))
+    actual_ciphertext += encryptor.finalize()
+    assert actual_ciphertext == binascii.unhexlify(ciphertext)
+    decryptor = cipher.decryptor()
+    actual_plaintext = decryptor.update(binascii.unhexlify(ciphertext))
+    actual_plaintext += decryptor.finalize()
+    assert actual_plaintext == binascii.unhexlify(plaintext)
+
+
+def generate_hash_test(param_loader, path, file_names, hash_cls,
+                       only_if=None, skip_message=None):
+    def test_hash(self):
+        for backend in _ALL_BACKENDS:
+            for file_name in file_names:
+                for params in param_loader(os.path.join(path, file_name)):
+                    yield (
+                        hash_test,
+                        backend,
+                        hash_cls,
+                        params,
+                        only_if,
+                        skip_message
+                    )
+    return test_hash
+
+
+def hash_test(backend, hash_cls, params, only_if, skip_message):
+    if only_if is not None and not only_if(backend):
+        pytest.skip(skip_message)
+    msg = params[0]
+    md = params[1]
+    m = hash_cls(backend=backend)
+    m.update(binascii.unhexlify(msg))
+    assert m.hexdigest() == md.replace(" ", "").lower()
+    digst = hash_cls(backend=backend, data=binascii.unhexlify(msg)).hexdigest()
+    assert digst == md.replace(" ", "").lower()
+
+
+def generate_base_hash_test(hash_cls, digest_size, block_size,
+                            only_if=None, skip_message=None):
+    def test_base_hash(self):
+        for backend in _ALL_BACKENDS:
+            yield (
+                base_hash_test,
+                backend,
+                hash_cls,
+                digest_size,
+                block_size,
+                only_if,
+                skip_message,
+            )
+    return test_base_hash
+
+
+def base_hash_test(backend, hash_cls, digest_size, block_size, only_if,
+                   skip_message):
+    if only_if is not None and not only_if(backend):
+        pytest.skip(skip_message)
+    m = hash_cls(backend=backend)
+    assert m.digest_size == digest_size
+    assert m.block_size == block_size
+    m_copy = m.copy()
+    assert m != m_copy
+    assert m._ctx != m_copy._ctx
+
+
+def generate_long_string_hash_test(hash_factory, md, only_if=None,
+                                   skip_message=None):
+    def test_long_string_hash(self):
+        for backend in _ALL_BACKENDS:
+            yield(
+                long_string_hash_test,
+                backend,
+                hash_factory,
+                md,
+                only_if,
+                skip_message
+            )
+    return test_long_string_hash
+
+
+def long_string_hash_test(backend, hash_factory, md, only_if, skip_message):
+    if only_if is not None and not only_if(backend):
+        pytest.skip(skip_message)
+    m = hash_factory(backend=backend)
+    m.update(b"a" * 1000000)
+    assert m.hexdigest() == md.lower()