W3cSubresourceIntegrityMetadata
value class W3cSubresourceIntegrityMetadata(val expression: ContentSecurityPolicySourceExpressionHash)(source)
The value MUST be an "integrity metadata" string as defined in Section 3 of W3C.SRI. If an integrity property is present for a particular claim, the Consumer of the respective document MUST verify the integrity of the retrieved document as defined in Section 3.3.5 of W3C.SRI.
This metadata MUST be encoded in the same format as the hash-source (without the single quotes) in section 4.2 of the Content Security Policy Level 2 specification. https://www.w3.org/TR/2016/REC-SRI-20160623/#integrity-metadata