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by adrian_b
902 days ago
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On a modern CPU (i.e. 64-bit Arm since 2012, Intel Atom since 2016, AMD Zen since 2017, Intel Core since 2019) SHA-256 is twice faster than MD5. The difference in speed between the hashing speeds is actually greater, a double speed for a long file is what you get when the execution time includes parts that are identical for the two hashes, i.e. launching md5sum/sha256sum and reading the file. Older versions of the binary coreutils package may mask this speed difference by having executables compiled only for very old CPUs. Recent coreutils versions normally use for hashing the OpenSSL library, if found, and OpenSSL uses the hardware instructions where available. Where a bad sha256sum is installed, "openssl dgst -r -sha256" should work instead. |
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