| Interface | Description | 
|---|---|
| PermissionCheck | This interface is implemented by components to enable privileged code to
 check whether the component has a given permission. | 
| Class | Description | 
|---|---|
| ConcurrentMessageDigest | A thread safe wrapper around  MessageDigestthat does not make use
 of ThreadLocal and - broadly - only creates enough MessageDigest objects
 to satisfy the concurrency requirements. | 
| KeyStoreUtil | |
| MD5Encoder | Encode an MD5 digest into a String. | 
| PrivilegedGetTccl | |
| PrivilegedSetTccl | 
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