The Keyed-Hash Message Authentication Code (HMAC) (FIPS-198 ...

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A copy of the waiver, any supporting documents, the document approving the waiver andany supporting and accompanying documents, with such deletions as the agency isauthorized and decides to make under Section 552(b) of Title 5, U.S. Code, shall be partof the procurement documentation and retained by the agency.14. Where to obtain copies. This publication is available by accessinghttp://csrc.nist.gov/publications/. A list of other available computer security publications,including ordering information, can be obtained from NIST Publications List 91, which isavailable at the same web site. Alternatively, copies of NIST computer securitypublications are available from: National Technical Information Service (NTIS), 5285Port Royal Road, Springfield, VA 22161.vi
Federal Information Processing Standards Publication 1982002 March 6Specifications forThe Keyed-Hash Message Authentication CodeTABLE OF CONTENTS1. INTRODUCTION........................................................................................................ 12. GLOSSARY OF TERMS AND ACRONYMS........................................................... 12.1 Glossary of Terms ................................................................................................. 12.2 Acronyms............................................................................................................... 22.3 HMAC Parameters and Symbols........................................................................... 23. CRYPTOGRAPHIC KEYS......................................................................................... 34. TRUNCATED OUTPUT............................................................................................. 35. HMAC SPECIFICATION ........................................................................................... 46. IMPLEMENTATION NOTE ...................................................................................... 5APPENDIX A: HMAC EXAMPLES................................................................................. 7APPENDIX B: A LIMITATION OF MAC ALGORITHMS .......................................... 12APPENDIX C: REFERENCES........................................................................................ 13vii
Page 1 and 2: FIPS PUB 198FEDERAL INFORMATION PRO
Page 3 and 4: Federal Information Processing Stan
Page 5: 12. Qualifications. The security af
Page 10 and 11: K 0Lopadttextx’N’bits.The key K
Page 12 and 13: Figure 1: Illustration of the HMAC
Page 14 and 15: APPENDIX A: HMAC EXAMPLESThese exam
Page 16 and 17: K 0 ⊕ opad:6c6d6e6f 68696a6b 6465
Page 18 and 19: a0K 0 : 70717273 74757677 78797a7b
Page 20: APPENDIX C: REFERENCES[1] American

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