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Key expansion


  Routine used to generate a series of Round Keys from the Cipher Key.
FIPS 197 under Key Expansion

  The second step in the key derivation procedure specified in this Recommendation to derive keying material with the desired length.
NIST SP 800-56C [Superseded]

  The second step in the key-derivation procedure in which a key-derivation key is used to derive secret keying material having the desired length(s). The first step in the procedure is randomness extraction.
NIST SP 800-133 Rev. 2