Merge pull request #4526 from takluyver/passwd_check_unicode

Allow unicode arguments to passwd_check on Python 2

Closes  #4524

IPython/lib/security.py

@@ -113,6 +113,6 b' def passwd_check(hashed_passphrase, passphrase):'
     if len(pw_digest) == 0:
         return False
 
-    h.update(cast_bytes(passphrase, 'utf-8') + str_to_bytes(salt, 'ascii'))
+    h.update(cast_bytes(passphrase, 'utf-8') + cast_bytes(salt, 'ascii'))
 
     return h.hexdigest() == pw_digest

IPython/lib/tests/test_security.py

@@ -1,3 +1,4 b''
+# coding: utf-8
 from IPython.lib import passwd
 from IPython.lib.security import passwd_check, salt_len
 import nose.tools as nt
@@ -19,3 +20,7 b' def test_bad():'
     nt.assert_equal(passwd_check(p, 'a:b:c:d'), False)
     nt.assert_equal(passwd_check(p, 'a:b'), False)
 
+def test_passwd_check_unicode():
+    # GH issue #4524
+    phash = u'sha1:23862bc21dd3:7a415a95ae4580582e314072143d9c382c491e4f'
+    assert passwd_check(phash, u"łe¶ŧ←↓→")
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