org.apache.hadoop.security.authentication.util
Classes 
KerberosName
KerberosUtil
RandomSignerSecretProvider
RolloverSignerSecretProvider
Signer
SignerSecretProvider
StringSignerSecretProvider
ZKSignerSecretProvider
ZKSignerSecretProvider.JaasConfiguration
Exceptions 
KerberosName.BadFormatString
KerberosName.NoMatchingRule
SignerException