Calculator reference
Verification evidence and limitations →
What it calculates
Computes a DES CBC-MAC or a retail MAC.
Inputs and methods
Algorithm 1 uses an 8-byte DES key; Algorithm 3 uses a 16-byte TDES key. HEX input and mode-specific padding.
Worked example
Select X9.19, key 0123456789ABCDEFFEDCBA9876543210, data HEX 4E6F77206973207468652074696D6520666F7220616C6C20.
A1C72E74EA3FA9B6
Specification and limits
The example is ASCII “Now is the time for all ” including its final space. Input padding changes the result.
ISO 9797-1 catalogue ↗