Update libraries/ to the new libtock.

libraries/crypto/Cargo.toml

@@ -10,10 +10,10 @@ license = "Apache-2.0"
 edition = "2018"
 
 [dependencies]
-libtock = { path = "../../third_party/libtock-rs" }
+libtock_drivers = { path = "../../third_party/libtock-drivers" }
 cbor = { path = "../cbor" }
 arrayref = "0.3.6"
-subtle = { version = "2.2", default-features = false, features = ["nightly"] }
+subtle = { version = "2.2.3", default-features = false, features = ["nightly"] }
 byteorder = { version = "1", default-features = false }
 hex = { version = "0.3.2", default-features = false, optional = true }
 ring = { version = "0.16.11", optional = true }

libraries/crypto/src/lib.rs

@@ -21,7 +21,6 @@ extern crate subtle;
 #[macro_use]
 extern crate arrayref;
 extern crate byteorder;
-extern crate libtock;
 #[macro_use]
 extern crate cbor;
 

libraries/crypto/src/rng256.rs

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-use libtock::rng;
+use libtock_drivers::rng;
 
 // Lightweight RNG trait to generate uniformly distributed 256 bits.
 pub trait Rng256 {