文件名称:
Secure Hash Standard
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文件大小: 211kb
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上传时间: 2009-04-02
详细说明： NIST网站： Federal Information Processing Standards Publication 180-2 2002 August 1 Announcing the SECURE HASH STANDARD Table Of Contents 1. INTRODUCTION .............................................................................................................................................................3 2. DEFINITIONS....................................................................................................................................................................4 2.1 GLOSSARY OF TERMS AND ACRONYMS.......... ..........................................................................................................4 2.2 ALGORITHM PARAMETERS, SYMBOLS, AND TERMS...............................................................................................4 2.2.1 Parameters.......................................................................................................................................................4 2.2.2 Symbols.............................................................................................................................................................5 3. NOTATION AND CONVENTIONS............................................................................................................................6 3.1 BIT STRINGS AND INTEGERS......................................................................................................................................6 3.2 OPERATIONS ON WORDS............................................................................................................................................7 4. FUNCTIONS AND CONSTANTS................................................................................................................................9 4.1 FUNCTIONS...................................................................................................................................................................9 4.1.1 SHA-1 Functions.............................................................................................................................................9 4.1.2 SHA-256 Functions........................................................................................................................................9 4.1.3 SHA-384 and SHA-512 Functions................................................................................................................9 4.2 CONSTANTS................................................................................................................................................................ 10 4.2.1 SHA-1 Constants...........................................................................................................................................10 4.2.2 SHA-256 Constants ......................................................................................................................................10 4.2.3 SHA-384 and SHA-512 Constants..............................................................................................................10 5. PREPROCESSING.........................................................................................................................................................12 5.1 PADDING THE MESSAGE ........................................................................................................................................... 12 5.1.1 SHA-1 and SHA-256.....................................................................................................................................12 5.1.2 SHA-384 and SHA-512................................................................................................................................12 5.2 PARSING THE PADDED MESSAGE ............................................................................................................................. 13 5.2.1 SHA-1 and SHA-256.....................................................................................................................................13 5.2.2 SHA-384 and SHA-512................................................................................................................................13 5.3 SETTING THE INITIAL HASH VALUE (H(0)).............................................................................................................. 13 5.3.1 SHA-1..............................................................................................................................................................13 5.3.2 SHA-256 .........................................................................................................................................................13 5.3.3 SHA-384 .........................................................................................................................................................14 5.3.4 SHA-512 .........................................................................................................................................................14 6. SECURE HASH ALGORITHMS ...............................................................................................................................15 6.1 SHA-1......................................................................................................................................................................... 15 6.1.1 SHA-1 Preprocessing...................................................................................................................................15 6.1.2 SHA-1 Hash Computation...........................................................................................................................15 6.1.3 Alternate Method for Computing a SHA-1 Message Digest...................................................................17 2 6.2 SHA-256..................................................................................................................................................................... 18 6.2.1 SHA-256 Preprocessing...............................................................................................................................19 6.2.2 SHA-256 Hash Computation.......................................................................................................................19 6.3 SHA-512..................................................................................................................................................................... 20 6.3.1 SHA-512 Preprocessing...............................................................................................................................21 6.3.2 SHA-512 Hash Computation.......................................................................................................................21 6.4 SHA-384..................................................................................................................................................................... 22 APPENDIX A: SHA-1 EXAMPLES ...................................................................................................................................25 A.1 SHA-1 EXAMPLE (ONE-BLOCK MESSAGE) ........................................................................................................... 25 A.2 SHA-1 EXAMPLE (MULTI-BLOCK MESSAGE) ....................................................................................................... 27 A.3 SHA-1 EXAMPLE (LONG MESSAGE) ....................................................................................................................... 32 APPENDIX B: SHA-256 EXAMPLES ...............................................................................................................................33 B.1 SHA-256 EXAMPLE (ONE-BLOCK MESSAGE) ....................................................................................................... 33 B.2 SHA-256 EXAMPLE (MULTI-BLOCK MESSAGE) ................................................................................................... 35 B.3 SHA-256 EXAMPLE (LONG MESSAGE)................................................................................................................... 40 APPENDIX C: SHA-512 EXAMPLES ...............................................................................................................................41 C.1 SHA-512 EXAMPLE (ONE-BLOCK MESSAGE) ....................................................................................................... 41 C.2 SHA-512 EXAMPLE (MULTI-BLOCK MESSAGE) ................................................................................................... 46 C.3 SHA-512 EXAMPLE (LONG MESSAGE)................................................................................................................... 55 APPENDIX D: SHA-384 EXAMPLES ..........................................................................................................................56 D.1 SHA-384 EXAMPLE (ONE-BLOCK MESSAGE) ....................................................................................................... 56 D.2 SHA-384 EXAMPLE (MULTI-BLOCK MESSAGE) ................................................................................................... 61 D.3 SHA-384 EXAMPLE (LONG MESSAGE)................................................................................................................... 70 APPENDIX E: REFERENCES............................................................................................................................................71 ...展开收缩
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