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diff --git a/pipermail/pycrypto/2012q2/000599.html b/pipermail/pycrypto/2012q2/000599.html new file mode 100644 index 0000000..51fa402 --- /dev/null +++ b/pipermail/pycrypto/2012q2/000599.html @@ -0,0 +1,129 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> +<HTML> + <HEAD> + <TITLE> [pycrypto] Typo or bug? + </TITLE> + <LINK REL="Index" HREF="index.html" > + <LINK REL="made" HREF="mailto:pycrypto%40lists.dlitz.net?Subject=Re%3A%20%5Bpycrypto%5D%20Typo%20or%20bug%3F&In-Reply-To=%3CCAEncD4faNrPm0NJG90nVVSDK1P5y6r6UXyD5iWgWyGKWxLg6kg%40mail.gmail.com%3E"> + <META NAME="robots" CONTENT="index,nofollow"> + <style type="text/css"> + pre { + white-space: pre-wrap; /* css-2.1, curent FF, Opera, Safari */ + } + </style> + <META http-equiv="Content-Type" content="text/html; charset=us-ascii"> + <LINK REL="Previous" HREF="000612.html"> + <LINK REL="Next" HREF="000600.html"> + </HEAD> + <BODY BGCOLOR="#ffffff"> + <H1>[pycrypto] Typo or bug?</H1> + <B>Dave Pawson</B> + <A HREF="mailto:pycrypto%40lists.dlitz.net?Subject=Re%3A%20%5Bpycrypto%5D%20Typo%20or%20bug%3F&In-Reply-To=%3CCAEncD4faNrPm0NJG90nVVSDK1P5y6r6UXyD5iWgWyGKWxLg6kg%40mail.gmail.com%3E" + TITLE="[pycrypto] Typo or bug?">dave.pawson at gmail.com + </A><BR> + <I>Tue Jun 26 02:52:32 EDT 2012</I> + <P><UL> + <LI>Previous message: <A HREF="000612.html">[pycrypto] problems with testing PyCrypto Module +</A></li> + <LI>Next message: <A HREF="000600.html">[pycrypto] Typo or bug? +</A></li> + <LI> <B>Messages sorted by:</B> + <a href="date.html#599">[ date ]</a> + <a href="thread.html#599">[ thread ]</a> + <a href="subject.html#599">[ subject ]</a> + <a href="author.html#599">[ author ]</a> + </LI> + </UL> + <HR> +<!--beginarticle--> +<PRE>Just re-installing pycrypto for my own use. Version 2.6, with python 2.7 +(src src <A HREF="http://www.turnkeylinux.org/blog/python-symmetric-encryption">http://www.turnkeylinux.org/blog/python-symmetric-encryption</A> ) +def _lazysecret(secret, blocksize=16, padding='}'): + """pads secret if not legal AES block size (16, 24, 32)""" + if not len(secret) in (16, 24, 32): + return secret + (blocksize - len(secret)) * padding + return secret + +def decrypt(ciphertext, secret, lazy=True, checksum=True): + """decrypt ciphertext with secret + ciphertext - encrypted content to decrypt + secret - secret to decrypt ciphertext + lazy - pad secret if less than legal blocksize (default: True) + checksum - verify crc32 byte encoded checksum (default: True) + returns plaintext + """ + secret = _lazysecret(secret) if lazy else secret + print secret, len(secret) + encobj = AES.new(secret, AES.MODE_CFB) + plaintext = encobj.decrypt(ciphertext) + if checksum: + crc, plaintext = (plaintext[-4:], plaintext[:-4]) + if not crc == struct.pack("i", zlib.crc32(plaintext)): + print "Checksum error" + raise CheckSumError("checksum mismatch") + return plaintext + + +run this and I get + +dkdkkd}}}}}}}}}} 16 +Traceback (most recent call last): + File "/files/python/fp/fp.py", line 148, in <module> + domain(sys.argv) + File "/files/python/fp/fp.py", line 131, in domain + str=decrypt(encContents,secret) + File "/files/python/fp/fp.py", line 97, in decrypt + encobj = AES.new(secret, AES.MODE_CFB) + File "/usr/lib64/python2.7/site-packages/Crypto/Cipher/AES.py", line +95, in new + return AESCipher(key, *args, **kwargs) + File "/usr/lib64/python2.7/site-packages/Crypto/Cipher/AES.py", line +59, in __init__ + blockalgo.BlockAlgo.__init__(self, _AES, key, *args, **kwargs) + File "/usr/lib64/python2.7/site-packages/Crypto/Cipher/blockalgo.py", +line 141, in __init__ + self._cipher = factory.new(key, *args, **kwargs) +ValueError: IV must be 16 bytes long + + +So although the 'secret' is 16 bytes long, I'm getting a report saying it isn't? + +Any suggestions please. + +TIA + +-- +Dave Pawson +XSLT XSL-FO FAQ. +Docbook FAQ. +<A HREF="http://www.dpawson.co.uk">http://www.dpawson.co.uk</A> +</PRE> + + + + + + + + + +<!--endarticle--> + <HR> + <P><UL> + <!--threads--> + <LI>Previous message: <A HREF="000612.html">[pycrypto] problems with testing PyCrypto Module +</A></li> + <LI>Next message: <A HREF="000600.html">[pycrypto] Typo or bug? +</A></li> + <LI> <B>Messages sorted by:</B> + <a href="date.html#599">[ date ]</a> + <a href="thread.html#599">[ thread ]</a> + <a href="subject.html#599">[ subject ]</a> + <a href="author.html#599">[ author ]</a> + </LI> + </UL> + +<hr> +<a href="http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto">More information about the pycrypto +mailing list</a><br> +</body></html> |