Initialize the digester.
This operation will consist in determining the actual configuration values to be used, and then initializing the digester with them.
These values are decided by applying the following priorities:
Once a digester has been initialized, trying to change its configuration (algorithm, provider, salt size, iterations or salt generator) will result in an AlreadyInitializedException being thrown.
@throws EncryptionInitializationException if initialization could notbe correctly done (for example, if the digest algorithm chosen cannot be used).
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