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HW accelerated tagged_sha256 #35

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  • with ability to provide mid-state:
ngu.hash.sha256t(tag, msg)   # will perform 3x sha256

ngu.hash.sha256t(tag_hash, msg, True)   # just 1x sha256 (assuming tag_has was pre-computed in advance, which is the case with BIP340-342)

ngu.secp256k1.tagged_sha256(tag, msg)  # 3x sha256 (kept for reference)

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