CBC-MAC implementation in C

Question

I'm hoping to do some benchmarking of CBC-MAC in C. Does anyone know of a robust C implementation? I've looked around but CBC-MAC implementations (in almost any language) seem to be quite rare. Does anyone know why beside its rather restrictive (desired) use cases, e.g., fixed-length input.

Thanks

CMAC simply extends CBC-MAC and is secure for variable sized input. Why would you use CBC-MAC? — Maarten Bodewes, Nov 06 '15 at 01:23

score 1 · Accepted Answer · answered Nov 05 '15 at 13:25

1

If you encrypt a message with a block cipher in CBC mode with a zero Initialization Vector, then the last encrypted block, is the CBC-MAC.

So if you have a block cipher implementation that supports CBC mode, you basically have support for CBC-MAC.

answered Nov 05 '15 at 13:25

Ebbe M. Pedersen

7,250
3
27
47

Are you sure? Doesn't the last block encrypted block have to be identical to the first encrypted block? – CodyBugstein Dec 21 '15 at 22:00

CBC-MAC implementation in C

1 Answers1