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# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from __future__ import absolute_import, division, print_function

import pytest

from cryptography.hazmat.bindings.commoncrypto.binding import Binding


@pytest.mark.skipif(not Binding.is_available(),
                    reason="CommonCrypto not available")
class TestCommonCrypto(object):
    def test_binding_loads(self):
        binding = Binding()
        assert binding
        assert binding.lib
        assert binding.ffi

    def test_binding_returns_same_lib(self):
        binding = Binding()
        binding2 = Binding()
        assert binding.lib == binding2.lib
        assert binding.ffi == binding2.ffi
) if err != nil { panic(err) } return bytes } type vectorArgs struct { count string offset uint64 key string plaintext string ciphertext string } type vectorVerifier interface { validate(count string, offset uint64, key, plaintext, expectedCiphertext []byte) } type arc4Verifier struct{} func (o arc4Verifier) validate(count string, offset uint64, key, plaintext, expectedCiphertext []byte) { if offset%16 != 0 || len(plaintext) != 16 || len(expectedCiphertext) != 16 { panic(fmt.Errorf("Unexpected input value encountered: offset=%v; len(plaintext)=%v; len(expectedCiphertext)=%v", offset, len(plaintext), len(expectedCiphertext))) } stream, err := rc4.NewCipher(key) if err != nil { panic(err) } var currentOffset uint64 = 0 ciphertext := make([]byte, len(plaintext)) for currentOffset <= offset { stream.XORKeyStream(ciphertext, plaintext) currentOffset += uint64(len(plaintext)) } if !bytes.Equal(ciphertext, expectedCiphertext) { panic(fmt.Errorf("vector mismatch @ COUNT = %s:\n %s != %s\n", count, hex.EncodeToString(expectedCiphertext), hex.EncodeToString(ciphertext))) } } func validateVectors(verifier vectorVerifier, filename string) { vectors, err := os.Open(filename) if err != nil { panic(err) } defer vectors.Close() var segments []string var vector *vectorArgs scanner := bufio.NewScanner(vectors) for scanner.Scan() { segments = strings.Split(scanner.Text(), " = ") switch { case strings.ToUpper(segments[0]) == "COUNT": if vector != nil { verifier.validate(vector.count, vector.offset, unhexlify(vector.key), unhexlify(vector.plaintext), unhexlify(vector.ciphertext)) } vector = &vectorArgs{count: segments[1]} case strings.ToUpper(segments[0]) == "OFFSET": vector.offset, err = strconv.ParseUint(segments[1], 10, 64) if err != nil { panic(err) } case strings.ToUpper(segments[0]) == "KEY": vector.key = segments[1] case strings.ToUpper(segments[0]) == "PLAINTEXT": vector.plaintext = segments[1] case strings.ToUpper(segments[0]) == "CIPHERTEXT": vector.ciphertext = segments[1] } } if vector != nil { verifier.validate(vector.count, vector.offset, unhexlify(vector.key), unhexlify(vector.plaintext), unhexlify(vector.ciphertext)) } } func main() { validateVectors(arc4Verifier{}, "vectors/cryptography_vectors/ciphers/ARC4/arc4.txt") fmt.Println("ARC4 OK.") }