Cryptocurrency · 2015
Secure Hash Standard (SHS): SHA-256
Excerpt · FIPS PUB 180-4 · August 2015
Specifies SHA-256: its functions, constants, message padding and parsing, initial hash value and hash computation.
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- A3
- License
- Public domain (U.S. Government work)
- Source
- nvlpubs.nist.gov
- Retrieved
- 27 September 2026
- Language
- English
- Rights holder
- National Institute of Standards and Technology, 2015
Theme
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Edition
FIPS PUB 180-4, Secure Hash Standard (SHS), August 2015 (https://doi.org/10.6028/NIST.FIPS.180-4), the PDF published by NIST (36 pages, 833315 bytes, SHA-256 0455b406d89648d20cbde375561e19c245b9815e894164c2670772e3d54deb82). Excerpt: the abstract (its two sentences, without the key words) in the header, then the sections that define SHA-256, complete and in their order: 2.2.1 Parameters, 2.2.2 Symbols and Operations, 4.1.2 SHA-224 and SHA-256 Functions, 4.2.2 SHA-224 and SHA-256 Constants, 5.1.1 (padding), 5.2.1 (parsing), 5.3.3 (initial hash value of SHA-256), 6.2 SHA-256 with 6.2.1 and 6.2.2; the other sections, and the headings of sections 2.2, 5, 5.1, 5.2 and 5.3 with their introductions, are left out. The prose comes from pdftotext and was checked word for word against the pages; four words split at a line end are rejoined with the hyphen of the printed page (w-bit, 32-bit, right-most, SHA-256). Formulas, the padding example and the hash computation, which pdftotext cannot read, are set in KaTeX from the page scans, with the symbols of the Standard (the assignments of 6.2.2 are “=” as printed). The 64 constants of 4.2.2 are set eight to a row as printed; they and the initial hash value were checked against the cube and square roots of the first primes. Superscript ordinals (ith, jth, tth, (i-1)st) and the italics and bold of the page are kept.
Rights
In the United States, a work of the federal government (17 U.S.C. 105): the Standard was prepared and issued by the National Institute of Standards and Technology, an agency of the U.S. Department of Commerce, and carries no copyright notice. In France, the rule of the shorter term (article L. 123-12 of the Code de la propriété intellectuelle, after article 7(8) of the Berne Convention): for a work whose country of origin is outside the European Union and whose author is not a national of a member state, the protection lasts as long as in the country of origin, which grants none.
NIST, Copyrights and Disclaimers (https://www.nist.gov/oism/copyrights, read on 27 September 2026): “With the exception of material marked as copyrighted, information presented on NIST sites are considered public information and may be distributed or copied. Use of appropriate byline/photo/image credits is requested.” The PDF has no copyright mark.
