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Encrypted data size while using Triple DES

Answer 1

+4 A:

TripleDESCryptoServiceProvider defaults to using PKCS7-padding. This pads any message to the next multiple of the block-size.

To avoid using padding, just set the Padding-property to PaddingMode.None

new TripleDESCryptoServiceProvider { 
  KeySize = keySizeInBits, 
  Padding = PaddingMode.None 
};

Rasmus Faber 2009-04-20 08:41:15

Thanks a lot. Your solution worked.I just don't understand the implementation. If the block given is exact multiple of blocksize, it shouldn't pad anything. I guess, any sane programmer would do it.

Hemant 2009-04-20 11:19:21

A reversible padding need to add some data to the plaintext to communicate how it should be removed. Thus it will have to expand n*8 bytes to (n+1)*8 bytes.

Rasmus Faber 2009-04-20 18:12:08

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Encrypted data size while using Triple DES

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