| Class | Description | 
|---|---|
| AWS4SignerRequestParams | Parameters that are used for computing a AWS 4 signature for a request. | 
| AWS4SignerUtils | Utility methods that is used by the different AWS Signer implementations. | 
| SignerConstants | |
| SignerKey | Holds the signing key and the number of days since epoch for the date for
 which the signing key was generated. | 
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