My thoughts. Randomness should be whitened. Anything feed into an randomness pool, should be mixed in and run through SHA256. pool = SHA256(pool || new-randomness) Pseudorandomness of the output has been a design goal/requirement only in SHA-3 family. Any prior hash function’s exhibition of this property is coincidental.
Therefore I suggest using SHA3 instead.
smime.p7s
Description: S/MIME cryptographic signature
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