1 files changed, 79 insertions, 0 deletions
diff --git a/src/password.rs b/src/password.rs
new file mode 100644
index 0000000..020fa58
--- /dev/null
+++ b/src/password.rs
@@ -0,0 +1,79 @@
+// checkpw - Check passwords against pwnedpasswords.com
+// Copyright (C) 2018  Harald Eilertsen <haraldei@anduin.net>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+use crate::k_anon::to_k_anon;
+use ring::digest;
+
+pub struct Password {
+    pub range: String,
+    pub rest: String,
+}
+
+impl Password {
+    pub fn new(pw: &str) -> Password {
+        let (range, rest) = to_k_anon(digest::digest(&digest::SHA1, &pw.as_bytes()));
+
+        Password { range, rest }
+    }
+
+    pub fn is_pwned(&self, hashes: &str) -> usize {
+        if let Some(pos) = hashes.find(&self.rest) {
+            if let Some(res) = hashes[pos..].lines().take(1).collect::<Vec<_>>().pop() {
+                return res
+                    .split(':')
+                    .skip(1)
+                    .collect::<Vec<_>>()
+                    .pop()
+                    .unwrap()
+                    .parse()
+                    .unwrap();
+            }
+        }
+
+        0
+    }
+}
+
+#[test]
+fn test_creating_new_password() {
+    let pw = Password::new("Passw0rd");
+    assert_eq!(&pw.range, "EBFC7");
+    assert_eq!(&pw.rest, "910077770C8340F63CD2DCA2AC1F120444F");
+}
+
+#[test]
+fn test_matching_response_with_no_matches() {
+    let pw = Password::new("Passw0rd");
+    let hashes = "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA:42";
+
+    assert_eq!(0, pw.is_pwned(&hashes));
+}
+
+#[test]
+fn test_matching_response_with_one_match() {
+    let pw = Password::new("Passw0rd");
+    let hashes = "910077770C8340F63CD2DCA2AC1F120444F:42";
+
+    assert_eq!(42, pw.is_pwned(&hashes));
+}
+
+#[test]
+fn test_matching_response_with_multiple_matches() {
+    let pw = Password::new("Passw0rd");
+    let hashes = "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA:3\n910077770C8340F63CD2DCA2AC1F120444F:42\n00000000000000000000:1";
+
+    assert_eq!(42, pw.is_pwned(&hashes));
+}