This extension, if present, defines the purpose (e.g., encipherment, signature, certificate signing) of the key contained in the certificate. The usage restriction might be employed when a multipurpose key is to be restricted (e.g., when an RSA key should be used only for signing or only for key encipherment). @author Amit Kapoor @author Hemma Prafullchandra @see Extension @see CertAttrSet
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