const crypto/x509.ExtKeyUsageClientAuth

3 uses

	crypto/x509 (current package)
		x509.go#L633: 	ExtKeyUsageClientAuth
		x509.go#L654: 	{ExtKeyUsageClientAuth, oidExtKeyUsageClientAuth},

	crypto/tls
		handshake_server.go#L930: 			KeyUsages:     []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth},

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