= Secure Hash Standard by National Institute of Standards and Technology
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Primary source: https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.180-4.pdf
Verified locator: FIPS PUB180-4, Secure Hash Standard, August2015, institutional author NIST. §1 overview; §§5.1–5.3 padding/block sizes/initial values; §§6.2–6.7 SHA-2 definitions.
https://doi.org/10.6028/NIST.FIPS.180-4[FIPS PUB 180-4, August 2015. Sections 5.1.1–5.2.1 specify SHA-256 padding and 512-bit blocks; section 6.2.2, printed pp. 22–23/PDF pages 27–28, specifies the 64-word schedule, 64 rounds and step-4 feedforward additions modulo 2^32 to the eight-word incoming state. The DOI resolved to the primary PDF when the direct NVL URL timed out.]
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