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authorNarayan Desai <desai@mcs.anl.gov>2007-03-12 16:22:51 +0000
committerNarayan Desai <desai@mcs.anl.gov>2007-03-12 16:22:51 +0000
commit6e5e9c8e969207e68665f12665a54768090897e4 (patch)
treede198777d5041073db4634a24ca37efad2a1017f /src/lib/tlslite/utils/Python_RC4.py
parentac3eb44f16bc14e41ed62169ca36e9992509d7d6 (diff)
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Merged in certs branch in preparation for 0.9.3pre2
git-svn-id: https://svn.mcs.anl.gov/repos/bcfg/trunk/bcfg2@2928 ce84e21b-d406-0410-9b95-82705330c041
Diffstat (limited to 'src/lib/tlslite/utils/Python_RC4.py')
-rwxr-xr-xsrc/lib/tlslite/utils/Python_RC4.py39
1 files changed, 39 insertions, 0 deletions
diff --git a/src/lib/tlslite/utils/Python_RC4.py b/src/lib/tlslite/utils/Python_RC4.py
new file mode 100755
index 000000000..56ce5fb2f
--- /dev/null
+++ b/src/lib/tlslite/utils/Python_RC4.py
@@ -0,0 +1,39 @@
+"""Pure-Python RC4 implementation."""
+
+from RC4 import RC4
+from cryptomath import *
+
+def new(key):
+ return Python_RC4(key)
+
+class Python_RC4(RC4):
+ def __init__(self, key):
+ RC4.__init__(self, key, "python")
+ keyBytes = stringToBytes(key)
+ S = [i for i in range(256)]
+ j = 0
+ for i in range(256):
+ j = (j + S[i] + keyBytes[i % len(keyBytes)]) % 256
+ S[i], S[j] = S[j], S[i]
+
+ self.S = S
+ self.i = 0
+ self.j = 0
+
+ def encrypt(self, plaintext):
+ plaintextBytes = stringToBytes(plaintext)
+ S = self.S
+ i = self.i
+ j = self.j
+ for x in range(len(plaintextBytes)):
+ i = (i + 1) % 256
+ j = (j + S[i]) % 256
+ S[i], S[j] = S[j], S[i]
+ t = (S[i] + S[j]) % 256
+ plaintextBytes[x] ^= S[t]
+ self.i = i
+ self.j = j
+ return bytesToString(plaintextBytes)
+
+ def decrypt(self, ciphertext):
+ return self.encrypt(ciphertext)