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adding NvIndexDynamic event

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iadgovuser58 2024-08-20 13:29:36 -04:00
parent af13448cff
commit 3374f89940
1 changed files with 97 additions and 0 deletions
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HIRS_Utils/src/main/java/hirs/utils/tpm/eventlog/events/NvIndexDynamicEventLogData.java Normal file
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package hirs.utils.tpm.eventlog.events;
import hirs.utils.HexUtils;
import java.nio.charset.StandardCharsets;
/**
* Class to process the NV_INDEX_DYNAMIC_EVENT_LOG_DATA per PFP.
* Per PFP, the first 16 bytes of the structure are a String based identifier (Signature),
* which are a NULL-terminated ASCII string "NvIndexInstance".
*
* HEADERS defined by PFP v1.06 Rev 52.
* Certain fields are common to both ..HEADER and ..HEADER2, and are noted below the structures.
* <p>
* typedef struct tdNV_INDEX_DYNAMIC_EVENT_LOG_DATA {
* BYTE Signature[16];
* UINT16 Version;
* UINT8[6] Reserved;
* UINT64 UID;
* UINT16 DescriptionSize;
* UINT8 Description[DescriptionSize];
* UINT16 DataSize;
* DEVICE_SECURITY_EVENT_DATA2 Data[DataSize];
* } NV_INDEX_DYNAMIC_EVENT_LOG_DATA;
* <p>
*/
public class NvIndexDynamicEventLogData {
/**
* Signature (text) data.
*/
private String signature = "";
/**
* Human-readable description of the data within this DEVICE_SECURITY_EVENT_DATA/..DATA2 event.
*/
String nvIndexDynamicInfo = "";
/**
* NvIndexInstanceEventLogData constructor.
*
* @param eventData byte array holding the event to process.
*/
public NvIndexDynamicEventLogData(final byte[] eventData) {
byte[] signatureBytes = new byte[16];
System.arraycopy(eventData, 0, signatureBytes, 0, 16);
signature = new String(signatureBytes, StandardCharsets.UTF_8);
signature = signature.replaceAll("[^\\P{C}\t\r\n]", ""); // remove null characters
byte[] versionBytes = new byte[2];
System.arraycopy(eventData, 16, versionBytes, 0, 2);
String nvIndexVersion = HexUtils.byteArrayToHexString(versionBytes);
if (nvIndexVersion.isEmpty()) {
nvIndexVersion = "version not readable";
}
nvIndexDynamicInfo = " Nv Index Dynamic Signature = " + signature + "\n";
nvIndexDynamicInfo += " Nv Index Dynamic Version = " + nvIndexVersion + "\n";
// 6 bytes of Reserved data
byte[] uidBytes = new byte[8];
System.arraycopy(eventData, 24, uidBytes, 0, 8);
String uid = HexUtils.byteArrayToHexString(uidBytes);
nvIndexDynamicInfo += " UID = " + uid + "\n";
byte[] descriptionSizeBytes = new byte[2];
System.arraycopy(eventData, 32, descriptionSizeBytes, 0, 2);
int descriptionSize = HexUtils.leReverseInt(descriptionSizeBytes);
byte[] descriptionBytes = new byte[descriptionSize];
System.arraycopy(eventData, 34, descriptionBytes, 0, descriptionSize);
String description = new String(descriptionBytes, StandardCharsets.UTF_8);
description = description.replaceAll("[^\\P{C}\t\r\n]", ""); // remove null characters
nvIndexDynamicInfo += " Description = " + description + "\n";
int dataSizeStartByte = 34 + descriptionSize;
byte[] dataSizeBytes = new byte[2];
System.arraycopy(eventData, dataSizeStartByte, dataSizeBytes, 0, 2);
int dataSize = HexUtils.leReverseInt(dataSizeBytes);
int dataStartByte = dataSizeStartByte + 2;
byte[] dataBytes = new byte[dataSize];
System.arraycopy(eventData, dataStartByte, dataBytes, 0, dataSize);
String data = HexUtils.byteArrayToHexString(dataBytes);
nvIndexDynamicInfo += " Data = " + data + "\n";
}
/**
* Returns a description of this event.
*
* @return Human-readable description of this event.
*/
public String toString() {
return nvIndexDynamicInfo;
}
}