Provides the classes and interfaces for the security framework.
 
 
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int
 MessageDigest.digest(byte[] buf,
 int offset,
 int len)
 
Completes the hash computation by performing final operations
such as padding. 
 protected int
 MessageDigestSpi.engineDigest(byte[] buf,
 int offset,
 int len)
 
Completes the hash computation by performing final
operations such as padding.