1 files changed, 110 insertions, 0 deletions
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..3b0cae4
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,110 @@
+// 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 reqwest;
+use ring::digest;
+
+//
+// Convert a slice of bytes into a string of hex values
+//
+fn to_hex(data: &[u8]) -> String {
+    data.iter()
+        .map(|b| format!("{:02X}", b))
+        .collect()
+}
+
+#[test]
+fn test_to_hex() {
+    let input = [0x01, 0x00, 0xff, 0xaa, 0x10, 0x07];
+    assert_eq!(to_hex(&input), "0100FFAA1007");
+}
+
+///
+/// Split the digest into the range and rest parts for k-anonymity
+///
+fn to_k_anon(d: digest::Digest) -> (String, String) {
+    let mut hash = to_hex(d.as_ref());
+    let rest = hash.split_off(5);
+    (hash, rest)
+}
+
+#[test]
+fn test_k_anon() {
+    let input = digest::digest(&digest::SHA1, "Passw0rd".as_bytes());
+    let (range, rest) = to_k_anon(input);
+    assert_eq!(&range, "EBFC7");
+    assert_eq!(&rest, "910077770C8340F63CD2DCA2AC1F120444F");
+}
+
+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));
+}
+
+pub fn check(pw: Password) -> Result<usize, reqwest::Error>{
+    let uri = &format!("https://api.pwnedpasswords.com/range/{}", pw.range);
+    let hashes = reqwest::get(uri)?.text()?;
+    Ok(pw.is_pwned(&hashes))
+}