Frank Denis 48fd92365a std.crypto.hash: allow creating hash functions from compositions (#11965) ...

A hash function cascade was a common way to avoid length-extension
attacks with traditional hash functions such as the SHA-2 family.

Add `std.crypto.hash.composition` to do exactly that using arbitrary
hash functions, and pre-define the common SHA2-based ones.

With this, we can now sign and verify Bitcoin signatures in pure Zig.

2022-07-01 11:37:41 +02:00

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