/usr/lib/R/site-library/sandwich/NAMESPACE is in r-cran-sandwich 2.2-8-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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export(
## core ingredients
  "sandwich",
  "bread",
  "meat",
## OPG estimator
  "vcovOPG",
## HC estimators  
  "vcovHC",
  "vcovHC.default",
  "meatHC",
## HAC estimators  
  "vcovHAC",
  "vcovHAC.default",
  "meatHAC",
  "kernHAC",
  "NeweyWest",
  "weave",
## weights/bandwidths for HAC estimators  
  "weightsLumley",
  "weightsAndrews",
  "bwAndrews",
  "bwNeweyWest",
## new estfun generic      
  "estfun",
## auxiliary functions
  "kweights",
  "isoacf",
  "pava.blocks")
## methods for extracting bread matrix
  S3method("bread", "lm")
  S3method("bread", "mlm")
  S3method("bread", "glm")
  S3method("bread", "survreg")
  S3method("bread", "coxph")
  S3method("bread", "nls")
  S3method("bread", "rlm")
  S3method("bread", "gam")
  S3method("bread", "hurdle")
  S3method("bread", "zeroinfl")
  S3method("bread", "mlogit")
## methods for empirical estimating functions
  S3method("estfun", "lm")
  S3method("estfun", "glm")
  S3method("estfun", "mlm")
  S3method("estfun", "survreg")
  S3method("estfun", "coxph")
  S3method("estfun", "nls")
  S3method("estfun", "rlm")
  S3method("estfun", "hurdle")
  S3method("estfun", "zeroinfl")
  S3method("estfun", "mlogit")
## methods for vcovHC
  S3method("vcovHC", "mlm")
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