Update RustCrypto crates

blake2 0.8.1 fixed an issue where HMAC-BLAKE2 results were just
completely wrong.  Naturally we have to update our tests, because we
were testing we got an incorrect value!

This upgrades to the latest version of blake2.  There are more recent
versions of pbkdf2 and hmac, but here I've chosen to go to the latest
versions that are compatible with the latest version of crypto-mac
supported by blake2.

Fixes: CVE-2019-16143

Cargo.toml

@@ -10,9 +10,9 @@ authors = ["Katharina Fey <kookie@spacekookie.de>"]
 
 [dependencies]
 rand = "0.5"
-pbkdf2 = "0.2"
-blake2 = "0.7"
-hmac = "0.6"
+pbkdf2 = "0.4"
+blake2 = "0.9"
+hmac = "0.8"
 base64 = "0.9"
 
 serde = "1.0"

tests/basic.rs

@@ -65,6 +65,6 @@ mod workflow {
     #[test]
     fn printers() {
         let k1 = Key::from_pw(KeyType::Aes128, "192837465", "jane");
-        assert_eq!(&format!("{:?}", k1), "Key: type: Aes128 – \"Mvd0jg==\"");
+        assert_eq!(&format!("{:?}", k1), "Key: type: Aes128 – \"4HaDrA==\"");
     }
 }