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POEncrypt file in Perl and decrypt in c#
 

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    <p>I'm trying to encrypt a text file using Perl and then decrypt it using a different application written in C#. Here's my Perl code:</p> <pre><code>use strict; use Crypt::CBC; my $ifh; my $ofh; my $line; my $cipher = Crypt::CBC-&gt;new( { 'key' =&gt; 'length16length16', 'cipher' =&gt; 'Rijndael', 'iv' =&gt; 'length16length16', 'literal_key' =&gt; 1, 'header' =&gt; 'none', 'padding' =&gt; 'null', 'keysize' =&gt; 128 / 8 } ); open($ifh,'&lt;', $infile) or die "Can't open $infile for encryption input: $!\n"; open($ofh, '&gt;', $outfile) or die "Can't open $outfile for encryption output: $!\n"; $cipher-&gt;start('encrypting'); for $line (&lt;$ifh&gt;) { print $ofh $cipher-&gt;crypt($line); } print $ofh $cipher-&gt;finish; close($ifh) or die "Error closing input file: $!\n"; close($ofh) or die "Error closing output file: $!\n"; </code></pre> <p>And my C# code for decryption:</p> <pre><code> RijndaelManaged myRijndael = new System.Security.Cryptography.RijndaelManaged(); myRijndael.Key = System.Text.Encoding.UTF8.GetBytes("length16length16"); myRijndael.IV = System.Text.Encoding.UTF8-&gt;GetBytes("length16length16"); myRijndael.Mode = CipherMode.CBC; myRijndael.Padding = PaddingMode.None; // Create a decryptor to perform the stream transform. ICryptoTransform decryptor = myRijndael.CreateDecryptor(myRijndael.Key, myRijndael.IV); //Create the streams used for decryption. FileStream file = File.OpenRead(strInFile); CryptoStream csDecrypt = new CryptoStream(file, decryptor, CryptoStreamMode.Read); StreamReader srDecrypt = new StreamReader(csDecrypt); // Read the decrypted bytes from the decrypting stream string decryptedText = srDecrypt.ReadToEnd(); </code></pre> <p>I keep getting </p> <blockquote> <p>System.Security.Cryptography.CryptographicException: Length of the data to decrypt is invalid</p> </blockquote> <p>When I try to read the data a few bytes at a time, I notice that the first 100 or so bytes are decrypted properly, but the rest is just garbage.</p> <p>BTW, I can decrypt the encrypted file using Perl with:</p> <pre><code>$cipher-&gt;start('decrypting'); </code></pre> <p>So what am I doing wrong with C# and Perl?</p> <p>EDIT: I tried following @munissor advice and change the C# code to use </p> <blockquote> <p>PaddingMode.Zeros</p> </blockquote> <p>but I still get the same exception. Help please...</p>
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    1. COC# needs the data to be padded to certain lengths. You can't use no padding if the data size doesn't convene the algorithm
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    2. CO@sehe: As munissor has pointed, Perl's 'padding' => 'null' means the blocks are filled with zeros.
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