Hi Ronald!
Thank you for the suggestions.
I have run some tests and have some numbers for you.

Hashing 100kb with sha256 on cortex-m7 board:
1. Current performance on master branch: ~5.2 million cycles
2. Removing call to mbedtls_platform_zeroize in mbedtls_internal_sha256_process_c: ~2.7 million cycles
3. Only calling mbedtls_platform_zeroize on the last block (by passing another argument to mbedtls_internal_sha256_process_c) : ~2.9 million cycles

Turns out I overestimated the slowdown in my original post, as it is closer to 50% - but with your suggestion we are back to almost the same numbers as before.
// Joel
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