Hmac.shorten: def of bend-collections@1.0.0.0
Import: import bend-collections@1.0.0.0/spec/crypto/hmac.bend as Hmac
Lines 36-37 of bend-collections@1.0.0.0/spec/crypto/hmac.bend: https://jend.leeeet.dev/read.txt?path=bend-collections@1.0.0.0/spec/crypto/hmac.bend&start_line=36&end_line=37

import Base

def shorten(+key: List<&2, U32>) -> List<&2, U32>:
  shorten_if(key, Nat.is_le(List.length(&2, U32, key), block_len()))

Uses (6):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List.length
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.is_le
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=bend-collections@1.0.0.0/spec/crypto/hmac.bend&name=block_len
  https://jend.leeeet.dev/definition.txt?path=bend-collections@1.0.0.0/spec/crypto/hmac.bend&name=shorten_if