The keyUsage object describes the key usage settings that are required for the signing certificate. It is constructed with a character that is used to represent each key usage type. The first through ninth characters, from left to right, represent the required value for these properties: digitalSignature, nonRepudiation, keyEncipherment, dataEncipherment, keyAgreement, keyCertSign, crlSign, encipherOnly, decipherOnly. Any additional characters are ignored.
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keyUsage