Wikipedia has pseudocode for sha256, rosettacode has several implementations and your favorite programming language has probably a libary for it.
rosettacode.org/wiki/SHA-256
Topic: How much operations take SHA-2 ? (Read 853 times)
Where can I find source of SHA implementation on CPU?
Traditionally is conversion factor 12700 flops per hash/s. In Talk:FLOPS :
Second question: How compute 6350 operations while SHA of long data take long time and SHA of short data take short time? How long data must be digest compute?
Quote
bitcoinwatch.com calculates PFLOPS of bitcoin network as: take number of Hashes/second (Terahashes/s of SHA256) and multiply by 12700 to get a "Single-precision FLOPS estimate". One hash calculation is considered as 6350 32-bit integer operations, and each integer operation is considered equal to two single-precision flops. Source of constants is: http://forum.bitcoin.org/index.php?topic=4689.0 (with reference to bincoinwatch's admin). Actual bitcoin mining contains no (or almost no) floating-point calculations.
But I wonder: one 32 bit integer operation is counts as two floating point operations? While one floating point operation take longer tome than one integer operation.Second question: How compute 6350 operations while SHA of long data take long time and SHA of short data take short time? How long data must be digest compute?
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