Be more precise about HMAC-BLAKE2s-256 and the key length
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@ -4,8 +4,9 @@ embeddedType EntityRef.Cap .
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; The sequence of Caveats is run RIGHT-TO-LEFT.
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; That is, the newest Caveats are at the right.
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;
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; Let f = HMAC-BLAKE2s, e = canonical machine-oriented serialization of some preserves value,
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; and k = the original secret key for the ref.
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; Let f(k,d) = HMAC-BLAKE2s-256(k,d)[0..16),
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; e = canonical machine-oriented serialization of some preserves value, and
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; k = the original secret key for the ref.
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;
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; The `sig` is then f(f(f(f(k, e(oid)), ...), Caveat), ...).
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;
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