digest, httr, utils, xml2 (>= 1.0.0.9001), base64enc
digest, httr, utils, xml2 (>= 1.0.1), base64enc
digest, httr, utils, xml2 (>= 1.0.1), base64enc, aws.s3
digest, httr, utils, xml2 (>= 1.0.1), base64enc, aws.s3,
methods