rules:
  - id: use-hmac-equal
    patterns:
        - pattern-either:
              - pattern: |
                      $MAC = hmac.New(...)
                      ...
                      $H = $MAC.Sum(...)
                      ...
                      bytes.Equal($H, ...)
              - pattern: |
                      $MAC = hmac.New(...)
                      ...
                      $H = $MAC.Sum(...)
                      ...
                      bytes.Equal(..., $H)
    message: "Comparing a MAC with bytes.Equal()"
    languages: [go]
    severity: ERROR