ASN.1 type CertHash is defined in terms of type DigestInfo as follows:.

    CertHash ::= DigestInfo

    DigestInfo ::= SEQUENCE {
       hashAlgorithm  DigestAlgorithmIdentifier,
       digest         Digest
    }

Type DigestInfo references the following types:

    DigestAlgorithmIdentifier ::= SEQUENCE {
       algorithm   ALGORITHM.&id({DigestAlgorithms}),
       parameters  ALGORITHM.&Type({DigestAlgorithms}{@algorithm})  OPTIONAL
    }

    Digest ::= OCTET STRING