rules:
  - id: hash-sum-without-write
    patterns:
                - pattern-either:
                        - pattern: |
                                $HASH.New().Sum($SLICE)
                        - pattern: |
                                $H := $HASH.New()
                                ...
                                $H.Sum($SLICE)
                - pattern-not: |
                        $H := $HASH.New()
                        ...
                        $H.Write(...)
                        ...
                        $H.Sum($SLICE)
                - pattern-not: |
                        $H := $HASH.New()
                        ...
                        $FUNC(..., $H, ...)
                        ...
                        $H.Sum($SLICE)
    message: "odd hash.Sum call flow"
    languages: [go]
    severity: ERROR