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If a candidate algorithm calculates intermediate values (e.g., internal rounds) for a message digest computation, the submitter shall include known answers for those intermediate values for a one-block and a two-block message digest computation for each of the required message digest sizes, as illustrated in Appendices A-D of FIPS 180-2, Secure Hash Standard.
Examples of intermediate values for the SHA family of hash functions are also available at http://www.nist.gov/CryptoToolkitExamples, where examples for SHA-256 are at http://csrc.nist.gov/groups/ST/toolkit/documents/Examples/SHA256.pdf .
For full details of the SHA-3 Submission Requirements, see the Federal Register Notice (November 2, 2007).