@techreport{RFC4231,
  title = {{Identifiers and Test Vectors for HMAC-SHA-224, HMAC-SHA-256, HMAC-SHA-384, and HMAC-SHA-512}},
  author = {Nystrom, M.},
  type = {RFC},
  number = {4231},
  institution = {IETF},
  month = dec,
  year = 2005,
  url = {http://tools.ietf.org/rfc/rfc4231.txt},
}

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