Add chacha module to encrypt ledger files

benches/chacha.rs

@@ -0,0 +1,29 @@
+#![feature(test)]
+
+extern crate solana;
+extern crate test;
+
+use solana::chacha::chacha_cbc_encrypt_files;
+use std::fs::remove_file;
+use std::fs::File;
+use std::io::Write;
+use std::path::Path;
+use test::Bencher;
+
+#[bench]
+fn bench_chacha_encrypt(bench: &mut Bencher) {
+    let in_path = Path::new("bench_chacha_encrypt_file_input.txt");
+    let out_path = Path::new("bench_chacha_encrypt_file_output.txt.enc");
+    {
+        let mut in_file = File::create(in_path).unwrap();
+        for _ in 0..1024 {
+            in_file.write("123456foobar".as_bytes()).unwrap();
+        }
+    }
+    bench.iter(move || {
+        chacha_cbc_encrypt_files(in_path, out_path, "thetestkey".to_string()).unwrap();
+    });
+
+    remove_file(in_path).unwrap();
+    remove_file(out_path).unwrap();
+}