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ISO/IEC 9797-1 MAC Algorithm 3 how to?

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piotrek
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PostPosted: Mon Oct 13, 2008 11:50 am    Post subject: ISO/IEC 9797-1 MAC Algorithm 3 how to? Reply with quote

Can anyone help me how to write it in .NET?
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KNRGoodMood
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PostPosted: Tue Feb 24, 2009 9:44 pm    Post subject: Reply with quote

it's rather simple to write it based on, say, DES.
The algorithm resembles CBC.

First, pad the message starting with byte 0x80 and following with zeroes so that the length of the message in bytes will be multiple of 8.

Then, encrypt the padded message with single DES CBC using first 8 bytes of the key.

Finally, encrypt the last block using all 16 bytes of the key with 112-bit 3DES ECB.

The result will be your 8 bytes.
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