{"id":1047,"date":"2013-06-28T13:50:46","date_gmt":"2013-06-28T12:50:46","guid":{"rendered":"http:\/\/www.phillips321.co.uk\/?p=1047"},"modified":"2013-06-28T13:50:46","modified_gmt":"2013-06-28T12:50:46","slug":"installing-pycrypto-in-windows-and-aes-demo","status":"publish","type":"post","link":"https:\/\/www.phillips321.co.uk\/2013\/06\/28\/installing-pycrypto-in-windows-and-aes-demo\/","title":{"rendered":"Installing PyCrypto in windows and AES demo"},"content":{"rendered":"

So I needed pycrypto for some AES bits I was doing.<\/p>\n

Unfortunately I was playing in windows so it wasn’t as easy as apt-get install.<\/p>\n

Download pycrypto from here<\/a>. Once downloaded extract it and then you’ll need to run ‘python setup.py build’. Unfortunately python 2.7.5 looks for visual studio 2007 so you need to trick it into using the version of visual studio you having installed, in my case it’s VS2010.<\/p>\n

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SET VS90COMNTOOLS=%VS100COMNTOOLS%
\npython setup.py build
\npython setup.py install<\/div><\/td><\/tr><\/tbody><\/table><\/div>\n

Simple when you know how….<\/p>\n

Example of AES encode and decode (note this isn’t that secure as we’re not using a IV anywhere, it’s just a dmeo)<\/p>\n

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<\/div><\/td>
from<\/span> Crypto.Cipher<\/span> import<\/span> AES
\nkey=<\/span>"YELLOW SUBMARINE"<\/span> #needs to be 16bytes<\/span>
\nplaintext=<\/span>"Goodness great balls of fire!"<\/span>
\n
\n#Encode (string and key needs to be multiple of 16bytes)<\/span>
\npadding =<\/span> 16<\/span> - (<\/span>len<\/span>(<\/span>plaintext)<\/span> % 16<\/span>)<\/span>
\nplaintext +=<\/span> chr<\/span>(<\/span>3<\/span>)<\/span>*padding # add 'End of Text' padding to plaintext<\/span>
\n
\nencryptor =<\/span> AES.new<\/span>(<\/span>key,<\/span> AES.MODE_ECB<\/span>)<\/span>
\nciphertext =<\/span> encryptor.encrypt<\/span>(<\/span>plaintext)<\/span>
\nprint<\/span> ciphertext
\n
\n#Decode<\/span>
\ndecryptor =<\/span> AES.new<\/span>(<\/span>key,<\/span> AES.MODE_ECB<\/span>)<\/span>
\nplaintext =<\/span> decryptor.decrypt<\/span>(<\/span>ciphertext)<\/span>
\nplaintext =<\/span> plaintext.strip<\/span>(<\/span>chr<\/span>(<\/span>3<\/span>)<\/span>)<\/span> # remove 'End of Text' padding<\/span>
\nprint<\/span> plaintext<\/div><\/td><\/tr><\/tbody><\/table><\/div>\n","protected":false},"excerpt":{"rendered":"

So I needed pycrypto for some AES bits I was doing. Unfortunately I was playing in windows so it wasn’t as easy as apt-get install. Download pycrypto from here. Once downloaded extract it and then you’ll need to run ‘python setup.py build’. Unfortunately python 2.7.5 looks for visual studio 2007 so you need to trick […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[374,378,377,137,380,379,373,111,376,375],"_links":{"self":[{"href":"https:\/\/www.phillips321.co.uk\/wp-json\/wp\/v2\/posts\/1047"}],"collection":[{"href":"https:\/\/www.phillips321.co.uk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.phillips321.co.uk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.phillips321.co.uk\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.phillips321.co.uk\/wp-json\/wp\/v2\/comments?post=1047"}],"version-history":[{"count":4,"href":"https:\/\/www.phillips321.co.uk\/wp-json\/wp\/v2\/posts\/1047\/revisions"}],"predecessor-version":[{"id":1051,"href":"https:\/\/www.phillips321.co.uk\/wp-json\/wp\/v2\/posts\/1047\/revisions\/1051"}],"wp:attachment":[{"href":"https:\/\/www.phillips321.co.uk\/wp-json\/wp\/v2\/media?parent=1047"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.phillips321.co.uk\/wp-json\/wp\/v2\/categories?post=1047"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.phillips321.co.uk\/wp-json\/wp\/v2\/tags?post=1047"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}