void
rrFromWire(DNSInput in) throws IOException {
	certType = in.readU16();
	keyTag = in.readU16();
	alg = in.readU8();
	cert = in.readByteArray();
}
Creates a CERT Record from the given data
@param certType The type of certificate (see constants)
@param keyTag The ID of the associated KEYRecord, if present
@param alg The algorithm of the associated KEYRecord, if present
@param cert Binary data representing the certificate
src/main/java/core/org/xbill/DNS/CERTRecord.java