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SHA-512 has 25% more rounds than SHA-256. On a 64-bit processor each round takes the same amount of operations, yet can process double the data per round, because the instructions process 64-bit words instead of 32-bit words. Therefore, 2 / 1.25 = 1.6, which is how much faster SHA-512 can be under optimal conditions. Of course there is memory overhead, ...


This isn't necessarily unexpected. 32-bit platforms vs 64-bit platforms can make a significant difference, as well as the amount of data you're hashing. $ uname -m x86_64 $ openssl speed sha256 sha512 The 'numbers' are in 1000s of bytes per second processed. type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 bytes sha256 ...


SHA-512 (and SHA-384) is usually faster on 64-bit platforms, and SHA-256 is usually faster on 32-bit platforms.

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