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Add multibase datatype definition #176

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merged 8 commits into from
Aug 31, 2023
Merged

Add multibase datatype definition #176

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6c6df6c
Move cryptosuiteString section into Datatypes section.
msporny Aug 22, 2023
4020207
Add multibase datatype.
msporny Aug 22, 2023
f66de43
Change range for proofValue.
msporny Aug 22, 2023
3c91a61
Fix grammar in multibase datatype definition.
msporny Aug 22, 2023
e5fbaad
Add multibase datatype to vocabulary.
msporny Aug 24, 2023
78c30c0
Update type for publicKeyMultibase and secretKeyMultibase.
msporny Aug 24, 2023
b93f78c
Simplify language in multibase datatype section.
msporny Aug 24, 2023
13bb354
Apply simplification to multibase canonical mapping via @iherman.
msporny Aug 24, 2023
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55 changes: 54 additions & 1 deletion index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -1936,7 +1936,14 @@ <h3>Securing Data Losslessly</h3>
</section>

<section>
<h3 id="cryptosuiteString">The `cryptosuiteString` Datatype</h3>
<h3>Datatypes</h3>

<p>
This section defines datatypes that are used by this specification.
</p>

<section>
<h4 id="cryptosuiteString">The `cryptosuiteString` Datatype</h3>

<p>
This specification encodes cryptographic suite identifiers as enumerable
Expand Down Expand Up @@ -1981,6 +1988,52 @@ <h3 id="cryptosuiteString">The `cryptosuiteString` Datatype</h3>
</dl>
</section>

<section>
<h4 id="multibase">The `multibase` Datatype</h3>

<p>
This specification encodes binary data into [[?MULTIBASE]]-encoded strings,
which is useful in environments that cannot represent some binary values, such
as ASCII-only data formats. In environments that support data types
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for string values, such as RDF [[?RDF-CONCEPTS]], [[?MULTIBASE]]-encoded
content is indicated using a literal value whose datatype is set to
`https://w3id.org/security#multibase`.
</p>

<p>
The `multibase` datatype is defined as follows:
</p>

<dl>
<dt>The URL denoting this datatype</dt>
<dd>
`https://w3id.org/security#multibase`
</dd>
<dt>The lexical space</dt>
<dd>
Any string that starts with a [[?MULTIBASE]] character and the rest of
the characters consist of allowable characters in the respective base-encoding
alphabet.
</dd>
<dt>The value space</dt>
<dd>
Any arbitrary binary data value.
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</dd>
<dt>The lexical-to-value mapping</dt>
<dd>
Any element of the lexical space is mapped to the value space by base-decoding
the value based on the base-decoding alphabet associated with the
first character in the lexical string.
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</dd>
<dt>The canonical mapping</dt>
<dd>
Any element of the value space is mapped to the lexical space by expressing
the desired base-encoding [[?MULTIBASE]] character first, and then base-encoding
the value according to the desired base-encoding alphabet.
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</dd>
</dl>
</section>

</section>

</section>
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2 changes: 1 addition & 1 deletion vocab/security/vocabulary.yml
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Expand Up @@ -197,7 +197,7 @@ property:
- id: proofValue
label: Proof value
domain: sec:Proof
range: xsd:string
range: sec:multibase
defined_by: https://www.w3.org/TR/vc-data-integrity/#dfn-proofvalue

- id: created
Expand Down