add test case with poc data

poc was originally reported in issue #12

ctr/tests/mod.rs

@@ -33,3 +33,43 @@ fn test_from_cipher() {
         assert_eq!(&buf, &ciphertext);
     }
 }
+
+#[test]
+fn compare_to_openssl_with_over_64bit_counter() {
+    use stream_cipher::{NewStreamCipher, SyncStreamCipher, SyncStreamCipherSeek};
+    // values from https://github.com/RustCrypto/stream-ciphers/issues/12 poc
+
+    let key = [
+        13, 193, 67, 14, 105, 84, 246, 135, 216, 216, 40, 251, 26, 84, 119, 223,
+    ];
+    let nonce = [
+        26, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+    ];
+    let data = [
+        255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+        255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+        255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+        255, 255, 255, 255, 255, 255, 7, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+        255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+        255, 255, 255, 255, 255, 255, 255, 255, 202, 124, 216, 0,
+    ];
+    let openssl = [
+        108, 253, 73, 159, 41, 43, 94, 79, 15, 121, 128, 186, 135, 246, 194, 87, 27, 222, 233, 216,
+        2, 74, 106, 79, 70, 239, 105, 93, 125, 169, 59, 243, 171, 225, 15, 165, 102, 87, 79, 1, 31,
+        125, 151, 72, 199, 184, 71, 14, 69, 200, 13, 5, 171, 26, 106, 86, 129, 55, 254, 219, 166,
+        51, 34, 105, 154, 166, 12, 108, 239, 100, 153, 125, 229, 136, 86, 30, 233, 149, 169, 77,
+        154, 25, 226, 107, 205, 53, 144, 233, 62, 225, 237, 218, 7, 246, 61, 146, 31, 189, 212,
+        178, 104, 88,
+    ];
+
+    let mut cipher = Aes128Ctr::new_var(&key, &nonce).unwrap();
+    let mut encrypted = data.to_vec();
+    cipher.apply_keystream(&mut encrypted);
+
+    assert_eq!(&encrypted[..], &openssl[..]);
+
+    cipher.seek(0);
+    cipher.apply_keystream(&mut encrypted[..]);
+
+    assert_eq!(&encrypted[..], &data[..]);
+}