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+---
+slug: hash-speeds
+title: "OpenSSL Hash Benchmarks"
+date: "2022-06-10T20:13:36-04:00"
+draft: true
+---
+
+I compiled [OpenSSL][] 3.0.3 and then benchmarked the following
+cryptographic hash functions:
+
+* [MD5 (broken, don't use!)][md5]
+* [SHA-1 (broken, don't use!)][sha1]
+* [SHA-256][sha2]
+* [SHA-512][sha2]
+* [BLAKE2s][blake2]
+* [BLAKE2b][blake2]
+* [SHA3-256][sha3]
+* [SHA3-512][sha3]
+
+**Note:** [MD5][md5] and [SHA-1][sha1] are included for reference, but
+both are broken and should not be used.
+
+Test systems:
+
+* [Lenovo Thinkpad X1 Carbon (9th Gen)][laptop]: [i7-1185G7][] CPU
+  with [accelerated SHA-1 and SHA-256 instructions][intel-sha].
+* [Raspberry Pi 4B][rpi]: [Cortex-A72][] CPU, which does *not* support
+  the [ARMv8 crypto extensions][arm-crypto].
+
+Detailed results, build scripts, and documentation are available in the
+[companion GitHub repository][repo].
+
+## Thinkpad X1 Carbon Results
+
+{{< figure
+  src="/files/posts/hash-speeds/flex-0.svg"
+  class=image
+  caption="Lenovo Thinkpad X1 Carbon (9th Gen) results."
+>}}
+
+Notes:
+
+* The [accelerated SHA-1 and SHA-256 instructions][intel-sha] are
+  clearly visible in the results.
+* [BLAKE2b][blake2] does quite well, considering.
+
+## Raspberry Pi 4B Results
+
+{{< figure
+  src="/files/posts/hash-speeds/cherry-0.svg"
+  class=image
+  caption="Raspberry Pi 4B results."
+>}}
+
+Notes:
+
+* [BLAKE2b][blake2] is clearly the fastest on the [Cortex-A72][].
+* [BLAKE2b][blake2] is faster than [BLAKE2s][blake2] because the former
+  is optimized for 32-bit CPUs, and the latter is optimized for 64-bit
+  CPUs.
+* [SHA512][sha2] is faster than [SHA256][sha2] because it has a
+  slight edge on 64-bit systems.
+
+[repo]: https://github.com/pablotron/hash-speeds
+  "GitHub repository."
+[openssl]: https://www.openssl.org/
+  "Cryptography and TLS toolkit."
+[md5]: https://en.wikipedia.org/wiki/MD5
+  "MD5 cryptographic hash function (broken, don't use)."
+[sha1]: https://en.wikipedia.org/wiki/SHA-1
+  "SHA-1 cryptographic hash function (broken, don't use)."
+[sha2]: https://en.wikipedia.org/wiki/SHA-2
+  "SHA-2 cryptographic hash function family."
+[blake2]: https://en.wikipedia.org/wiki/BLAKE_(hash_function)#BLAKE2
+  "BLAKE2 cryptographic hash function family."
+[sha3]: https://en.wikipedia.org/wiki/SHA-3
+  "SHA-3 cryptographic hash function family."
+[laptop]: https://en.wikipedia.org/wiki/ThinkPad_X1_series#X1_Carbon_(9th_Gen)
+  "Lenovo Thinkpad X1 Carbon (9th Gen)"
+[rpi]: https://en.wikipedia.org/wiki/Raspberry_Pi
+  "Raspberry Pi 4B"
+[intel-sha]: https://en.wikipedia.org/wiki/Intel_SHA_extensions
+  "Intel SHA extensions"
+[i7-1185G7]: https://ark.intel.com/content/www/us/en/ark/products/208664/intel-core-i71185g7-processor-12m-cache-up-to-4-80-ghz-with-ipu.html
+  "Intel i7-1185G7"
+[cortex-a72]: https://en.wikipedia.org/wiki/ARM_Cortex-A72
+  "ARM Cortex-A72"
+[arm-crypto]: https://en.wikichip.org/wiki/arm/armv8#Crypto_Extension
+  "ARMv8 crypto extensions"