delete the internal kangarootwelve bindings

My kangarootwelve_xkcp crate was originally derived from these bindings,
but today it's better maintained and easier to build. This also improves
the performance of the very long K12 benchmark.

Cargo.toml

@@ -19,14 +19,16 @@ edition = "2018"
 # only controls whether blake2b_simd and blake2s_simd build with no_std.
 default = ["std"]
 std = ["blake2b_simd/std", "blake2s_simd/std"]
+# only for benchmarks
+kangarootwelve = ["kangarootwelve_xkcp"]
 
 [dependencies]
 arrayvec = "0.7.0"
 blake2b_simd = { path = "./blake2b", default-features = false }
 blake2s_simd = { path = "./blake2s", default-features = false }
 blake2-avx2-sneves = { path = "benches/blake2-avx2-sneves", optional = true }
 hex = "0.3.2"
-kangarootwelve = { path = "benches/kangarootwelve", optional = true }
+kangarootwelve_xkcp = { version = "0.1.5", optional = true }
 lazy_static = "1.3.0"
 libsodium-ffi = { version = "0.1.17", optional = true }
 openssl = { version = "0.10.23", optional = true }

benches/bench.rs

@@ -361,20 +361,20 @@ fn bench_long_sneves_blake2sp(b: &mut Bencher) {
 #[bench]
 fn bench_verylong_kangarootwelve(b: &mut Bencher) {
     let mut input = RandomInput::new(b, VERYLONG);
-    b.iter(|| kangarootwelve::kangarootwelve(input.get()));
+    b.iter(|| kangarootwelve_xkcp::hash(input.get()));
 }
 
 #[cfg(feature = "kangarootwelve")]
 #[bench]
 fn bench_long_kangarootwelve(b: &mut Bencher) {
     let mut input = RandomInput::new(b, LONG);
-    b.iter(|| kangarootwelve::kangarootwelve(input.get()));
+    b.iter(|| kangarootwelve_xkcp::hash(input.get()));
 }
 
 #[cfg(feature = "kangarootwelve")]
 #[bench]
 fn bench_onebyte_kangarootwelve(b: &mut Bencher) {
-    b.iter(|| kangarootwelve::kangarootwelve(b"x"));
+    b.iter(|| kangarootwelve_xkcp::hash(b"x"));
 }
 
 #[cfg(feature = "libsodium-ffi")]