Day 5

1 files changed, 39 insertions, 0 deletions

diff --git a/src/bin/day05.rs b/src/bin/day05.rs
new file mode 100644
index 0000000..a860e53
--- /dev/null
+++ b/src/bin/day05.rs
@@ -0,0 +1,39 @@
+extern crate crypto;
+
+use std::io::{self, Read};
+
+use crypto::digest::Digest;
+use crypto::md5::Md5;
+
+fn solve(input: &str) -> String {
+    let mut password = String::new();
+    let mut index = 0u64;
+
+    while password.len() < 8 {
+        let mut md5 = Md5::new();
+        md5.input_str(input);
+        md5.input_str(&index.to_string());
+        let digest = md5.result_str();
+
+        if &digest[0..5] == "00000" {
+            password.push_str(&digest[5..6]);
+        }
+
+        index += 1;
+    }
+
+    password
+}
+
+fn main() {
+    let mut input = String::new();
+    io::stdin().read_to_string(&mut input).unwrap();
+
+    println!("Part 1: {}", solve(input.trim()));
+}
+
+#[test]
+#[ignore]
+fn part1() {
+    assert_eq!("18f47a30", solve("abc"));
+}