Re^3: AES Interoperability between Perl and C#

My program works fine for strings that are not multiples of 16 bytes.

I could not get Crypt:CBC to work in a compatible way. I might have gotten in to work by experimenting with padding and the IV on both sides, but since my method works, there didn't seem to be any advantage.

Comment on Re^3: AES Interoperability between Perl and C#

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Re^4: AES Interoperability between Perl and C# by ikegami (Patriarch) on Nov 17, 2005 at 22:57 UTC
Oh I see! You (redundantly) include the length of the plaintext, and require extra code on the decryption side to remove the padding. If you used Crypt::CBC, you wouldn't need to include the length of the plaintext in the ciphertext. Caveat: I'm assuming FlushFinalBlock uses a padding method compatible with Crypt::CBC's. Well, Crypt::CBC since Crypt::CBC can handle any padding, so I guess I meant "compatible with the default Crypt::CBC padding method".	[reply]

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Re^4: AES Interoperability between Perl and C#
by ikegami (Patriarch) on Nov 17, 2005 at 22:57 UTC

Oh I see! You (redundantly) include the length of the plaintext, and require extra code on the decryption side to remove the padding. If you used Crypt::CBC, you wouldn't need to include the length of the plaintext in the ciphertext.

Caveat: I'm assuming FlushFinalBlock uses a padding method compatible with Crypt::CBC's. Well, Crypt::CBC since Crypt::CBC can handle any padding, so I guess I meant "compatible with the default Crypt::CBC padding method".

[reply]