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ZIP 216: Fix description of non-canonical identity encoding

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str4d 2021-06-02 03:36:21 +01:00 committed by GitHub
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@ -90,8 +90,8 @@ Non-normative note: There are two such bit sequences,
:math:`\mathsf{I2LEOSP}_{\ell_{\mathbb{J}}}(2^{255} + 1)` and
:math:`\mathsf{I2LEOSP}_{\ell_{\mathbb{J}}}(2^{255} + q_{\mathbb{J}} - 1)`.
The Sapling protocol uses little-endian ordering when converting between bit and
byte sequences, so the first of these sequences corresponds to :math:`31` zero bytes
followed by a :math:`\mathtt{0x80}` byte.
byte sequences, so the first of these sequences corresponds to a :math:`\mathtt{0x01}`
byte, followed by :math:`30` zero bytes, and then a :math:`\mathtt{0x80}` byte.
Once this ZIP activates, the following places within the Sapling consensus protocol
where Jubjub points occur MUST reject non-canonical Jubjub point encodings.