diff --git a/tests/primitives/test_cryptrec.py b/tests/primitives/test_cryptrec.py
index c30bda4..c8e0af0 100644
--- a/tests/primitives/test_cryptrec.py
+++ b/tests/primitives/test_cryptrec.py
@@ -12,51 +12,26 @@
 # limitations under the License.
 
 """
-Test using the CRYPTREC (Camellia) Test Vectors
+Tests using the CRYPTREC (Camellia) Test Vectors
 """
 
 from __future__ import absolute_import, division, print_function
 
 import binascii
-import itertools
-import os
 
-import pytest
+from cryptography.primitives.block import ciphers, modes
 
-from cryptography.primitives.block import BlockCipher, ciphers, modes
-
+from .utils import generate_encrypt_test
 from ..utils import load_cryptrec_vectors_from_file
 
 
-def parameterize_encrypt_test(cipher, vector_type, params, fnames):
-    return pytest.mark.parametrize(params,
-        list(itertools.chain.from_iterable(
-            load_cryptrec_vectors_from_file(
-                os.path.join(cipher, vector_type, fname),
-            )
-            for fname in fnames
-        ))
-    )
-
-
 class TestCamelliaECB(object):
-    @parameterize_encrypt_test(
-        "Camellia", "NTT",
-        ("key", "plaintext", "ciphertext"),
-        [
-            "camellia-128-ecb.txt",
-            "camellia-192-ecb.txt",
-            "camellia-256-ecb.txt",
-        ]
+    test_NTT = generate_encrypt_test(
+        load_cryptrec_vectors_from_file,
+        "Camellia",
+        "NTT",
+        ["camellia-128-ecb", "camellia-192-ecb", "camellia-256"],
+        lambda key: ciphers.Camellia(binascii.unhexlify((key))),
+        lambda key: modes.EBC(),
+        only_if=lambda api: api.supports_cipher("camellia-128-ecb")
     )
-    def test_NTT(self, key, plaintext, ciphertext, api):
-        if not api.supports_cipher("camellia-128-ecb"):
-            pytest.skip("Does not support Camellia ECB")  # pragma: no cover
-        cipher = BlockCipher(
-            ciphers.Camellia(binascii.unhexlify(key)),
-            modes.ECB(),
-            api
-        )
-        actual_ciphertext = cipher.encrypt(binascii.unhexlify(plaintext))
-        actual_ciphertext += cipher.finalize()
-        assert binascii.hexlify(actual_ciphertext).upper() == ciphertext
diff --git a/tests/primitives/test_nist.py b/tests/primitives/test_nist.py
index 261bbd1..0c9569f 100644
--- a/tests/primitives/test_nist.py
+++ b/tests/primitives/test_nist.py
@@ -18,33 +18,18 @@
 from __future__ import absolute_import, division, print_function
 
 import binascii
-import itertools
-import os
 
-import pytest
+from cryptography.primitives.block import ciphers, modes
 
-from cryptography.primitives.block import BlockCipher, ciphers, modes
-
+from .utils import generate_encrypt_test
 from ..utils import load_nist_vectors_from_file
 
 
-def parameterize_encrypt_test(cipher, vector_type, params, fnames):
-    return pytest.mark.parametrize(params,
-        list(itertools.chain.from_iterable(
-            load_nist_vectors_from_file(
-                os.path.join(cipher, vector_type, fname),
-                "ENCRYPT",
-                params
-            )
-            for fname in fnames
-        ))
-    )
-
-
 class TestAES_CBC(object):
-    @parameterize_encrypt_test(
-        "AES", "KAT",
-        ("key", "iv", "plaintext", "ciphertext"),
+    test_KAT = generate_encrypt_test(
+        lambda path: load_nist_vectors_from_file(path, "ENCRYPT"),
+        "AES",
+        "KAT",
         [
             "CBCGFSbox128.rsp",
             "CBCGFSbox192.rsp",
@@ -58,42 +43,30 @@
             "CBCVarTxt128.rsp",
             "CBCVarTxt192.rsp",
             "CBCVarTxt256.rsp",
-        ]
+        ],
+        lambda key, iv: ciphers.AES(binascii.unhexlify(key)),
+        lambda key, iv: modes.CBC(binascii.unhexlify(iv)),
     )
-    def test_KAT(self, key, iv, plaintext, ciphertext, api):
-        cipher = BlockCipher(
-            ciphers.AES(binascii.unhexlify(key)),
-            modes.CBC(binascii.unhexlify(iv)),
-            api
-        )
-        actual_ciphertext = cipher.encrypt(binascii.unhexlify(plaintext))
-        actual_ciphertext += cipher.finalize()
-        assert binascii.hexlify(actual_ciphertext) == ciphertext
 
-    @parameterize_encrypt_test(
-        "AES", "MMT",
-        ("key", "iv", "plaintext", "ciphertext"),
+    test_MMT = generate_encrypt_test(
+        lambda path: load_nist_vectors_from_file(path, "ENCRYPT"),
+        "AES",
+        "MMT",
         [
             "CBCMMT128.rsp",
             "CBCMMT192.rsp",
             "CBCMMT256.rsp",
-        ]
+        ],
+        lambda key, iv: ciphers.AES(binascii.unhexlify(key)),
+        lambda key, iv: modes.CBC(binascii.unhexlify(iv)),
     )
-    def test_MMT(self, key, iv, plaintext, ciphertext, api):
-        cipher = BlockCipher(
-            ciphers.AES(binascii.unhexlify(key)),
-            modes.CBC(binascii.unhexlify(iv)),
-            api
-        )
-        actual_ciphertext = cipher.encrypt(binascii.unhexlify(plaintext))
-        actual_ciphertext += cipher.finalize()
-        assert binascii.hexlify(actual_ciphertext) == ciphertext
 
 
 class TestAES_ECB(object):
-    @parameterize_encrypt_test(
-        "AES", "KAT",
-        ("key", "plaintext", "ciphertext"),
+    test_KAT = generate_encrypt_test(
+        lambda path: load_nist_vectors_from_file(path, "ENCRYPT"),
+        "AES",
+        "KAT",
         [
             "ECBGFSbox128.rsp",
             "ECBGFSbox192.rsp",
@@ -107,42 +80,30 @@
             "ECBVarTxt128.rsp",
             "ECBVarTxt192.rsp",
             "ECBVarTxt256.rsp",
-        ]
+        ],
+        lambda key: ciphers.AES(binascii.unhexlify(key)),
+        lambda key: modes.ECB(),
     )
-    def test_KAT(self, key, plaintext, ciphertext, api):
-        cipher = BlockCipher(
-            ciphers.AES(binascii.unhexlify(key)),
-            modes.ECB(),
-            api
-        )
-        actual_ciphertext = cipher.encrypt(binascii.unhexlify(plaintext))
-        actual_ciphertext += cipher.finalize()
-        assert binascii.hexlify(actual_ciphertext) == ciphertext
 
-    @parameterize_encrypt_test(
-        "AES", "MMT",
-        ("key", "plaintext", "ciphertext"),
+    test_MMT = generate_encrypt_test(
+        lambda path: load_nist_vectors_from_file(path, "ENCRYPT"),
+        "AES",
+        "MMT",
         [
             "ECBMMT128.rsp",
             "ECBMMT192.rsp",
             "ECBMMT256.rsp",
-        ]
+        ],
+        lambda key: ciphers.AES(binascii.unhexlify(key)),
+        lambda key: modes.ECB(),
     )
-    def test_MMT(self, key, plaintext, ciphertext, api):
-        cipher = BlockCipher(
-            ciphers.AES(binascii.unhexlify(key)),
-            modes.ECB(),
-            api
-        )
-        actual_ciphertext = cipher.encrypt(binascii.unhexlify(plaintext))
-        actual_ciphertext += cipher.finalize()
-        assert binascii.hexlify(actual_ciphertext) == ciphertext
 
 
 class TestAES_OFB(object):
-    @parameterize_encrypt_test(
-        "AES", "KAT",
-        ("key", "iv", "plaintext", "ciphertext"),
+    test_KAT = generate_encrypt_test(
+        lambda path: load_nist_vectors_from_file(path, "ENCRYPT"),
+        "AES",
+        "KAT",
         [
             "OFBGFSbox128.rsp",
             "OFBGFSbox192.rsp",
@@ -156,42 +117,30 @@
             "OFBVarTxt128.rsp",
             "OFBVarTxt192.rsp",
             "OFBVarTxt256.rsp",
-        ]
+        ],
+        lambda key, iv: ciphers.AES(binascii.unhexlify(key)),
+        lambda key, iv: modes.OFB(binascii.unhexlify(iv)),
     )
-    def test_KAT(self, key, iv, plaintext, ciphertext, api):
-        cipher = BlockCipher(
-            ciphers.AES(binascii.unhexlify(key)),
-            modes.OFB(binascii.unhexlify(iv)),
-            api
-        )
-        actual_ciphertext = cipher.encrypt(binascii.unhexlify(plaintext))
-        actual_ciphertext += cipher.finalize()
-        assert binascii.hexlify(actual_ciphertext) == ciphertext
 
-    @parameterize_encrypt_test(
-        "AES", "MMT",
-        ("key", "iv", "plaintext", "ciphertext"),
+    test_MMT = generate_encrypt_test(
+        lambda path: load_nist_vectors_from_file(path, "ENCRYPT"),
+        "AES",
+        "MMT",
         [
             "OFBMMT128.rsp",
             "OFBMMT192.rsp",
             "OFBMMT256.rsp",
-        ]
+        ],
+        lambda key, iv: ciphers.AES(binascii.unhexlify(key)),
+        lambda key, iv: modes.OFB(binascii.unhexlify(iv)),
     )
-    def test_MMT(self, key, iv, plaintext, ciphertext, api):
-        cipher = BlockCipher(
-            ciphers.AES(binascii.unhexlify(key)),
-            modes.OFB(binascii.unhexlify(iv)),
-            api
-        )
-        actual_ciphertext = cipher.encrypt(binascii.unhexlify(plaintext))
-        actual_ciphertext += cipher.finalize()
-        assert binascii.hexlify(actual_ciphertext) == ciphertext
 
 
 class TestAES_CFB(object):
-    @parameterize_encrypt_test(
-        "AES", "KAT",
-        ("key", "iv", "plaintext", "ciphertext"),
+    test_KAT = generate_encrypt_test(
+        lambda path: load_nist_vectors_from_file(path, "ENCRYPT"),
+        "AES",
+        "KAT",
         [
             "CFB128GFSbox128.rsp",
             "CFB128GFSbox192.rsp",
@@ -205,33 +154,21 @@
             "CFB128VarTxt128.rsp",
             "CFB128VarTxt192.rsp",
             "CFB128VarTxt256.rsp",
-        ]
+        ],
+        lambda key, iv: ciphers.AES(binascii.unhexlify(key)),
+        lambda key, iv: modes.CFB(binascii.unhexlify(iv)),
     )
-    def test_KAT(self, key, iv, plaintext, ciphertext, api):
-        cipher = BlockCipher(
-            ciphers.AES(binascii.unhexlify(key)),
-            modes.CFB(binascii.unhexlify(iv)),
-            api
-        )
-        actual_ciphertext = cipher.encrypt(binascii.unhexlify(plaintext))
-        actual_ciphertext += cipher.finalize()
-        assert binascii.hexlify(actual_ciphertext) == ciphertext
 
-    @parameterize_encrypt_test(
-        "AES", "MMT",
-        ("key", "iv", "plaintext", "ciphertext"),
+
+    test_MMT = generate_encrypt_test(
+        lambda path: load_nist_vectors_from_file(path, "ENCRYPT"),
+        "AES",
+        "MMT",
         [
             "CFB128MMT128.rsp",
             "CFB128MMT192.rsp",
             "CFB128MMT256.rsp",
-        ]
+        ],
+        lambda key, iv: ciphers.AES(binascii.unhexlify(key)),
+        lambda key, iv: modes.CFB(binascii.unhexlify(iv)),
     )
-    def test_MMT(self, key, iv, plaintext, ciphertext, api):
-        cipher = BlockCipher(
-            ciphers.AES(binascii.unhexlify(key)),
-            modes.CFB(binascii.unhexlify(iv)),
-            api
-        )
-        actual_ciphertext = cipher.encrypt(binascii.unhexlify(plaintext))
-        actual_ciphertext += cipher.finalize()
-        assert binascii.hexlify(actual_ciphertext) == ciphertext
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 73394a5..8141faf 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -56,21 +56,19 @@
     PLAINTEXT = 9798c4640bad75c7c3227db910174e72
     """).splitlines()
 
-    assert load_nist_vectors(vector_data, "ENCRYPT",
-        ["key", "iv", "plaintext", "ciphertext"],
-    ) == [
-        (
-            b"00000000000000000000000000000000",
-            b"00000000000000000000000000000000",
-            b"f34481ec3cc627bacd5dc3fb08f273e6",
-            b"0336763e966d92595a567cc9ce537f5e",
-        ),
-        (
-            b"00000000000000000000000000000000",
-            b"00000000000000000000000000000000",
-            b"9798c4640bad75c7c3227db910174e72",
-            b"a9a1631bf4996954ebc093957b234589",
-        ),
+    assert load_nist_vectors(vector_data, "ENCRYPT") == [
+        {
+            "key": b"00000000000000000000000000000000",
+            "iv": b"00000000000000000000000000000000",
+            "plaintext": b"f34481ec3cc627bacd5dc3fb08f273e6",
+            "ciphertext": b"0336763e966d92595a567cc9ce537f5e",
+        },
+        {
+            "key": b"00000000000000000000000000000000",
+            "iv": b"00000000000000000000000000000000",
+            "plaintext": b"9798c4640bad75c7c3227db910174e72",
+            "ciphertext": b"a9a1631bf4996954ebc093957b234589",
+        },
     ]
 
 
@@ -112,72 +110,69 @@
     PLAINTEXT = 9798c4640bad75c7c3227db910174e72
     """).splitlines()
 
-    assert load_nist_vectors(vector_data, "DECRYPT",
-        ["key", "iv", "ciphertext", "plaintext"],
-    ) == [
-        (
-            b"00000000000000000000000000000000",
-            b"00000000000000000000000000000000",
-            b"0336763e966d92595a567cc9ce537f5e",
-            b"f34481ec3cc627bacd5dc3fb08f273e6",
-        ),
-        (
-            b"00000000000000000000000000000000",
-            b"00000000000000000000000000000000",
-            b"a9a1631bf4996954ebc093957b234589",
-            b"9798c4640bad75c7c3227db910174e72",
-        ),
+    assert load_nist_vectors(vector_data, "DECRYPT") == [
+        {
+            "key": b"00000000000000000000000000000000",
+            "iv": b"00000000000000000000000000000000",
+            "plaintext": b"f34481ec3cc627bacd5dc3fb08f273e6",
+            "ciphertext": b"0336763e966d92595a567cc9ce537f5e",
+        },
+        {
+            "key": b"00000000000000000000000000000000",
+            "iv": b"00000000000000000000000000000000",
+            "plaintext": b"9798c4640bad75c7c3227db910174e72",
+            "ciphertext": b"a9a1631bf4996954ebc093957b234589",
+        },
     ]
 
 
 def test_load_nist_vectors_from_file_encrypt():
     assert load_nist_vectors_from_file(
         "AES/KAT/CBCGFSbox128.rsp",
-        "ENCRYPT",
-        ["key", "iv", "plaintext", "ciphertext"],
+        "ENCRYPT"
     ) == [
-        (
-            b"00000000000000000000000000000000",
-            b"00000000000000000000000000000000",
-            b"f34481ec3cc627bacd5dc3fb08f273e6",
-            b"0336763e966d92595a567cc9ce537f5e",
-        ),
-        (
-            b"00000000000000000000000000000000",
-            b"00000000000000000000000000000000",
-            b"9798c4640bad75c7c3227db910174e72",
-            b"a9a1631bf4996954ebc093957b234589",
-        ),
-        (
-            b"00000000000000000000000000000000",
-            b"00000000000000000000000000000000",
-            b"96ab5c2ff612d9dfaae8c31f30c42168",
-            b"ff4f8391a6a40ca5b25d23bedd44a597",
-        ),
-        (
-            b"00000000000000000000000000000000",
-            b"00000000000000000000000000000000",
-            b"6a118a874519e64e9963798a503f1d35",
-            b"dc43be40be0e53712f7e2bf5ca707209",
-        ),
-        (
-            b"00000000000000000000000000000000",
-            b"00000000000000000000000000000000",
-            b"cb9fceec81286ca3e989bd979b0cb284",
-            b"92beedab1895a94faa69b632e5cc47ce",
-        ),
-        (
-            b"00000000000000000000000000000000",
-            b"00000000000000000000000000000000",
-            b"b26aeb1874e47ca8358ff22378f09144",
-            b"459264f4798f6a78bacb89c15ed3d601",
-        ),
-        (
-            b"00000000000000000000000000000000",
-            b"00000000000000000000000000000000",
-            b"58c8e00b2631686d54eab84b91f0aca1",
-            b"08a4e2efec8a8e3312ca7460b9040bbf",
-        ),
+        {
+            "key": b"00000000000000000000000000000000",
+            "iv": b"00000000000000000000000000000000",
+            "plaintext": b"f34481ec3cc627bacd5dc3fb08f273e6",
+            "ciphertext": b"0336763e966d92595a567cc9ce537f5e",
+        },
+        {
+            "key": b"00000000000000000000000000000000",
+            "iv": b"00000000000000000000000000000000",
+            "plaintext": b"9798c4640bad75c7c3227db910174e72",
+            "ciphertext": b"a9a1631bf4996954ebc093957b234589",
+        },
+        {
+            "key": b"00000000000000000000000000000000",
+            "iv": b"00000000000000000000000000000000",
+            "plaintext": b"96ab5c2ff612d9dfaae8c31f30c42168",
+            "ciphertext": b"ff4f8391a6a40ca5b25d23bedd44a597",
+        },
+        {
+            "key": b"00000000000000000000000000000000",
+            "iv": b"00000000000000000000000000000000",
+            "plaintext": b"6a118a874519e64e9963798a503f1d35",
+            "ciphertext": b"dc43be40be0e53712f7e2bf5ca707209",
+        },
+        {
+            "key": b"00000000000000000000000000000000",
+            "iv": b"00000000000000000000000000000000",
+            "plaintext": b"cb9fceec81286ca3e989bd979b0cb284",
+            "ciphertext": b"92beedab1895a94faa69b632e5cc47ce",
+        },
+        {
+            "key": b"00000000000000000000000000000000",
+            "iv": b"00000000000000000000000000000000",
+            "plaintext": b"b26aeb1874e47ca8358ff22378f09144",
+            "ciphertext": b"459264f4798f6a78bacb89c15ed3d601",
+        },
+        {
+            "key": b"00000000000000000000000000000000",
+            "iv": b"00000000000000000000000000000000",
+            "plaintext": b"58c8e00b2631686d54eab84b91f0aca1",
+            "ciphertext": b"08a4e2efec8a8e3312ca7460b9040bbf",
+        },
     ]
 
 
@@ -185,50 +180,49 @@
     assert load_nist_vectors_from_file(
         "AES/KAT/CBCGFSbox128.rsp",
         "DECRYPT",
-        ["key", "iv", "ciphertext", "plaintext"],
-    ) == [
-        (
-            b"00000000000000000000000000000000",
-            b"00000000000000000000000000000000",
-            b"0336763e966d92595a567cc9ce537f5e",
-            b"f34481ec3cc627bacd5dc3fb08f273e6",
-        ),
-        (
-            b"00000000000000000000000000000000",
-            b"00000000000000000000000000000000",
-            b"a9a1631bf4996954ebc093957b234589",
-            b"9798c4640bad75c7c3227db910174e72",
-        ),
-        (
-            b"00000000000000000000000000000000",
-            b"00000000000000000000000000000000",
-            b"ff4f8391a6a40ca5b25d23bedd44a597",
-            b"96ab5c2ff612d9dfaae8c31f30c42168",
-        ),
-        (
-            b"00000000000000000000000000000000",
-            b"00000000000000000000000000000000",
-            b"dc43be40be0e53712f7e2bf5ca707209",
-            b"6a118a874519e64e9963798a503f1d35",
-        ),
-        (
-            b"00000000000000000000000000000000",
-            b"00000000000000000000000000000000",
-            b"92beedab1895a94faa69b632e5cc47ce",
-            b"cb9fceec81286ca3e989bd979b0cb284",
-        ),
-        (
-            b"00000000000000000000000000000000",
-            b"00000000000000000000000000000000",
-            b"459264f4798f6a78bacb89c15ed3d601",
-            b"b26aeb1874e47ca8358ff22378f09144"
-        ),
-        (
-            b"00000000000000000000000000000000",
-            b"00000000000000000000000000000000",
-            b"08a4e2efec8a8e3312ca7460b9040bbf",
-            b"58c8e00b2631686d54eab84b91f0aca1"
-        ),
+    ) ==  [
+        {
+            "key": b"00000000000000000000000000000000",
+            "iv": b"00000000000000000000000000000000",
+            "plaintext": b"f34481ec3cc627bacd5dc3fb08f273e6",
+            "ciphertext": b"0336763e966d92595a567cc9ce537f5e",
+        },
+        {
+            "key": b"00000000000000000000000000000000",
+            "iv": b"00000000000000000000000000000000",
+            "plaintext": b"9798c4640bad75c7c3227db910174e72",
+            "ciphertext": b"a9a1631bf4996954ebc093957b234589",
+        },
+        {
+            "key": b"00000000000000000000000000000000",
+            "iv": b"00000000000000000000000000000000",
+            "plaintext": b"96ab5c2ff612d9dfaae8c31f30c42168",
+            "ciphertext": b"ff4f8391a6a40ca5b25d23bedd44a597",
+        },
+        {
+            "key": b"00000000000000000000000000000000",
+            "iv": b"00000000000000000000000000000000",
+            "plaintext": b"6a118a874519e64e9963798a503f1d35",
+            "ciphertext": b"dc43be40be0e53712f7e2bf5ca707209",
+        },
+        {
+            "key": b"00000000000000000000000000000000",
+            "iv": b"00000000000000000000000000000000",
+            "plaintext": b"cb9fceec81286ca3e989bd979b0cb284",
+            "ciphertext": b"92beedab1895a94faa69b632e5cc47ce",
+        },
+        {
+            "key": b"00000000000000000000000000000000",
+            "iv": b"00000000000000000000000000000000",
+            "plaintext": b"b26aeb1874e47ca8358ff22378f09144",
+            "ciphertext": b"459264f4798f6a78bacb89c15ed3d601",
+        },
+        {
+            "key": b"00000000000000000000000000000000",
+            "iv": b"00000000000000000000000000000000",
+            "plaintext": b"58c8e00b2631686d54eab84b91f0aca1",
+            "ciphertext": b"08a4e2efec8a8e3312ca7460b9040bbf",
+        },
     ]
 
 
@@ -254,21 +248,21 @@
     """).splitlines()
 
     assert load_cryptrec_vectors(vector_data) == [
-        (
-            b"00000000000000000000000000000000",
-            b"80000000000000000000000000000000",
-            b"07923A39EB0A817D1C4D87BDB82D1F1C",
-        ),
-        (
-            b"00000000000000000000000000000000",
-            b"40000000000000000000000000000000",
-            b"48CD6419809672D2349260D89A08D3D3",
-        ),
-        (
-            b"10000000000000000000000000000000",
-            b"80000000000000000000000000000000",
-            b"07923A39EB0A817D1C4D87BDB82D1F1C",
-        ),
+        {
+            "key": b"00000000000000000000000000000000",
+            "plaintext": b"80000000000000000000000000000000",
+            "ciphertext": b"07923A39EB0A817D1C4D87BDB82D1F1C",
+        },
+        {
+            "key": b"00000000000000000000000000000000",
+            "plaintext": b"40000000000000000000000000000000",
+            "ciphertext": b"48CD6419809672D2349260D89A08D3D3",
+        },
+        {
+            "key": b"10000000000000000000000000000000",
+            "plaintext": b"80000000000000000000000000000000",
+            "ciphertext": b"07923A39EB0A817D1C4D87BDB82D1F1C",
+        },
     ]
 
 
@@ -277,11 +271,11 @@
         "Camellia/NTT/camellia-128-ecb.txt"
     )
     assert test_set[0] == (
-        (
-            b"00000000000000000000000000000000",
-            b"80000000000000000000000000000000",
-            b"07923A39EB0A817D1C4D87BDB82D1F1C",
-        )
+        {
+            "key": b"00000000000000000000000000000000",
+            "plaintext": b"80000000000000000000000000000000",
+            "ciphertext": b"07923A39EB0A817D1C4D87BDB82D1F1C",
+        }
     )
     assert len(test_set) == 1280
 
diff --git a/tests/utils.py b/tests/utils.py
index d06c9e3..2220822 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -14,7 +14,7 @@
 import os.path
 
 
-def load_nist_vectors(vector_data, op, fields):
+def load_nist_vectors(vector_data, op):
     section, count, data = None, None, {}
 
     for line in vector_data:
@@ -44,21 +44,19 @@
         # For all other tokens we simply want the name, value stored in
         # the dictionary
         else:
-            data[section][count][name.lower()] = value
+            data[section][count][name.lower()] = value.encode("ascii")
 
-    # We want to test only for a particular operation
-    return [
-        tuple(vector[1][f].encode("ascii") for f in fields)
-        for vector in sorted(data[op].items(), key=lambda v: v[0])
-    ]
+    # We want to test only for a particular operation, we sort them for the
+    # benefit of the tests of this function.
+    return [v for k, v in sorted(data[op].items(), key=lambda kv: kv[0])]
 
 
-def load_nist_vectors_from_file(filename, op, fields):
+def load_nist_vectors_from_file(filename, op):
     base = os.path.join(
         os.path.dirname(__file__), "primitives", "vectors", "NIST",
     )
     with open(os.path.join(base, filename), "r") as vector_file:
-        return load_nist_vectors(vector_file, op, fields)
+        return load_nist_vectors(vector_file, op)
 
 
 def load_cryptrec_vectors_from_file(filename):
@@ -87,7 +85,11 @@
             ct = line.split(" : ")[1].replace(" ", "").encode("ascii")
             # after a C is found the K+P+C tuple is complete
             # there are many P+C pairs for each K
-            cryptrec_list.append((key, pt, ct))
+            cryptrec_list.append({
+                "key": key,
+                "plaintext": pt,
+                "ciphertext": ct
+            })
     return cryptrec_list