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Your code doesn't work if the cleartext is not an exact multiple of 16 bytes in length (and maybe even if it is), because Crypt::Rijndael doesn't handle padding. Crypt::CBC handles that.

Your Perl code manually prepends/extracts the IV to/from the encrypted text. Crypt::CBC handles that.

Crypt::CBC has other features too, such as generating a random IV when so desired.

That's why Crypt::Rijndael should be in conjunction with Crypt::CBC instead of using Crypt::Rijndael's CBC mode.

The fix (and simplification) is:

use strict; use warnings; use MIME::Base64; use Crypt::CBC; my $key = pack("H*", "01020304050607080910111213141516"); my $cipher = Crypt::CBC->new(-cipher => 'Rijndael'); my $in = decode_base64(<>); print "out = '", unpack("N/A", $cipher->decrypt($in)), "'\n";

By the way, I removed use bytes since it was useless since you didn't use any numbers except the constants 0 and 16.

Also, I don't think Crypt::Rijndael's new sets $! (or ever returns false).

(Untested. I don't have these modules.)

In reply to Re^2: AES Interoperability between Perl and C# by ikegami
in thread AES Interoperability between Perl and C# by jpfarmer

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