Problem 45213. AES-256 KeyExpansion()
Given a 32-byte hexadecimal character array representing the AES-256 input key, execute the AES-256 algorithm, KeyExpansion() and output the xth (input) key-word of this 60-word sequence as a 4x2 hexadecimal array. You will need the SubBytes() function done in one of my previous Cody problems.
Refer to this link: https://csrc.nist.gov/csrc/media/publications/fips/197/final/documents/fips-197.pdf
For example:
key='e32868331fa8ef0138de0de85478346aec5e3912b6029ae71691c384237a3eeb'; x=58;%want key-word number 58 out of 60 w=['d0';'eb';'7c';'8a'];%58th key-word
Solution Stats
Solution Comments
Show commentsProblem Recent Solvers2
Suggested Problems
-
Maximum running product for a string of numbers
2163 Solvers
-
Create a function handle that reverses the input arguments of another function handle
150 Solvers
-
Back to basics 12 - Input Arguments
597 Solvers
-
Vectorizing, too easy or too hard?
144 Solvers
-
Output any real number that is neither positive nor negative
393 Solvers
More from this Author56
Problem Tags
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!