Code added

README.md

@@ -1,2 +1,8 @@
 # pwned-search
 Pwned Password API lookup
+
+Usage:
+
+python pwned.py [password]
+
+Have fun! Oh, and if you find one of your own passwords, change it asap!

pwned.py

@@ -0,0 +1,35 @@
+import requests
+import cryptography
+from base64 import b16encode
+import sys
+from cryptography.hazmat.backends import default_backend
+from cryptography.hazmat.primitives import hashes
+
+def hash_password_sha1_hex(pwd):
+    digest = hashes.Hash(hashes.SHA1(), backend=default_backend())
+    digest.update(pwd.encode('ASCII'))
+    sha1 = b16encode(digest.finalize()).decode('ASCII')
+    return sha1
+
+def lookup_pwned_api(pwd):
+    sha1pwd = hash_password_sha1_hex(pwd)
+    head = sha1pwd[:5]
+    tail = sha1pwd[5:]
+
+    r = requests.get('https://api.pwnedpasswords.com/range/{0}'.format(head))
+    if r.status_code == 200:
+        hashes = (s.split(':') for s in r.text.split('\r\n'))
+        pred = ((head + t,count) for t,count in hashes if t == tail)
+
+    password_hit = next(pred, None)
+    return password_hit
+
+
+api_return = lookup_pwned_api(sys.argv[1])
+if (api_return):
+    print (sys.argv[1], "was found")
+    print ("Hash {0}, {1} occurences".format(api_return[0], api_return[1]))
+else:
+    print (sys.argv[1], "was not found")
+
+exit()