Imported Upstream version 5.4.4

1 files changed, 76 insertions, 0 deletions

diff --git a/nikola/rc4.py b/nikola/rc4.py
new file mode 100644
index 0000000..6e63474
--- /dev/null
+++ b/nikola/rc4.py
@@ -0,0 +1,76 @@
+"""
+    Copyright (C) 2012 Bo Zhu http://about.bozhu.me
+
+    Permission is hereby granted, free of charge, to any person obtaining a
+    copy of this software and associated documentation files (the "Software"),
+    to deal in the Software without restriction, including without limitation
+    the rights to use, copy, modify, merge, publish, distribute, sublicense,
+    and/or sell copies of the Software, and to permit persons to whom the
+    Software is furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be included in
+    all copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+    THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+    DEALINGS IN THE SOFTWARE.
+"""
+
+import base64
+import sys
+
+
+def KSA(key):
+    keylength = len(key)
+
+    S = list(range(256))
+
+    j = 0
+    for i in range(256):
+        j = (j + S[i] + key[i % keylength]) % 256
+        S[i], S[j] = S[j], S[i]  # swap
+
+    return S
+
+
+def PRGA(S):
+    i = 0
+    j = 0
+    while True:
+        i = (i + 1) % 256
+        j = (j + S[i]) % 256
+        S[i], S[j] = S[j], S[i]  # swap
+
+        K = S[(S[i] + S[j]) % 256]
+        yield K
+
+
+def RC4(key):
+    S = KSA(key)
+    return PRGA(S)
+
+
+def rc4(key, string):
+    """Encrypt things.
+    >>> print(rc4("Key", "Plaintext"))
+    u/MW6NlArwrT
+    """
+
+    string.encode('utf8')
+    key.encode('utf8')
+
+    def convert_key(s):
+        return [ord(c) for c in s]
+    key = convert_key(key)
+    keystream = RC4(key)
+    r = b''
+    for c in string:
+        if sys.version_info[0] == 3:
+            r += bytes([ord(c) ^ next(keystream)])
+        else:
+            r += chr(ord(c) ^ next(keystream))
+    return base64.b64encode(r).replace(b'\n', b'').decode('ascii')