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Refactor FSTEntry decrypting

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This commit is contained in:
Maschell 2019-04-30 15:43:04 +02:00
parent 8dc4c8cf4d
commit b432537af7
2 changed files with 123 additions and 91 deletions
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162
src/de/mas/wiiu/jnus/implementations/FSTDataProviderNUSTitle.java
View File

@ -21,7 +21,6 @@ import java.io.InputStream;
import java.io.OutputStream;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import java.util.Optional;
import java.util.stream.Collectors;
import de.mas.wiiu.jnus.NUSTitle;
@ -75,6 +74,89 @@ public class FSTDataProviderNUSTitle implements FSTDataProvider, HasNUSTitle {
}
}
private boolean decryptFSTEntryToStreamHashed(FSTEntry entry, OutputStream outputStream, long offset, long size)
throws IOException, CheckSumWrongException, NoSuchAlgorithmException {
Content c = title.getTMD().getContentByIndex(entry.getContentIndex());
long payloadOffset = entry.getFileOffset() + offset;
long streamOffset = payloadOffset;
long streamFilesize = 0;
streamOffset = (payloadOffset / 0xFC00) * 0x10000;
long offsetInBlock = payloadOffset - ((streamOffset / 0x10000) * 0xFC00);
if (offsetInBlock + size < 0xFC00) {
streamFilesize = 0x10000L;
} else {
long curVal = 0x10000;
long missing = (size - (0xFC00 - offsetInBlock));
curVal += (missing / 0xFC00) * 0x10000;
if (missing % 0xFC00 > 0) {
curVal += 0x10000;
}
streamFilesize = curVal;
}
NUSDataProvider dataProvider = title.getDataProvider();
InputStream in = dataProvider.readContentAsStream(c, streamOffset, streamFilesize);
NUSDecryption nusdecryption = new NUSDecryption(title.getTicket().get());
return nusdecryption.decryptStreamsHashed(in, outputStream, payloadOffset, size, dataProvider.getContentH3Hash(c));
}
private boolean decryptFSTEntryToStreamNonHashed(FSTEntry entry, OutputStream outputStream, long offset, long size)
throws IOException, CheckSumWrongException, NoSuchAlgorithmException {
Content c = title.getTMD().getContentByIndex(entry.getContentIndex());
byte[] IV = new byte[0x10];
IV[0] = (byte) ((c.getIndex() >> 8) & 0xFF);
IV[1] = (byte) (c.getIndex() & 0xFF);
long payloadOffset = entry.getFileOffset() + offset;
long streamOffset = payloadOffset;
long streamFilesize = c.getEncryptedFileSize();
// if we have an offset we can't calculate the hash anymore
// we need a new IV
if (streamOffset > 0) {
streamFilesize = size;
streamOffset -= 16;
streamFilesize += 16;
// We need to get the current IV as soon as we get the InputStream.
IV = null;
}
NUSDataProvider dataProvider = title.getDataProvider();
InputStream in = dataProvider.readContentAsStream(c, streamOffset, streamFilesize);
if (IV == null) {
// If we read with an offset > 16 we need the previous 16 bytes because they are the IV.
// The input stream has been prepared to start 16 bytes earlier on this case.
int toRead = 16;
byte[] data = new byte[toRead];
int readTotal = 0;
while (readTotal < toRead) {
int res = in.read(data, readTotal, toRead - readTotal);
StreamUtils.checkForException(in);
if (res < 0) {
// This should NEVER happen.
throw new IOException();
}
readTotal += res;
}
IV = Arrays.copyOfRange(data, 0, toRead);
}
NUSDecryption nusdecryption = new NUSDecryption(title.getTicket().get());
return nusdecryption.decryptStreamsNonHashed(in, outputStream, payloadOffset, size, c, IV, size != entry.getFileSize());
}
private boolean decryptFSTEntryToStream(FSTEntry entry, OutputStream outputStream, long offset, long size)
throws IOException, CheckSumWrongException, NoSuchAlgorithmException {
if (entry.isNotInPackage() || !title.getTicket().isPresent()) {
@ -92,78 +174,18 @@ public class FSTDataProviderNUSTitle implements FSTDataProvider, HasNUSTitle {
Content c = title.getTMD().getContentByIndex(entry.getContentIndex());
long payloadOffset = entry.getFileOffset() + offset;
long streamOffset = payloadOffset;
long streamFilesize = c.getEncryptedFileSize();
Optional<byte[]> IV = Optional.empty();
if (c.isHashed()) {
streamOffset = (payloadOffset / 0xFC00) * 0x10000;
long offsetInBlock = payloadOffset - ((streamOffset / 0x10000) * 0xFC00);
if (offsetInBlock + size < 0xFC00) {
streamFilesize = 0x10000L;
} else {
long curVal = 0x10000;
long missing = (size - (0xFC00 - offsetInBlock));
curVal += (missing / 0xFC00) * 0x10000;
if (missing % 0xFC00 > 0) {
curVal += 0x10000;
}
streamFilesize = curVal;
}
} else {
byte[] newIV = new byte[0x10];
newIV[0] = (byte) ((c.getIndex() >> 8) & 0xFF);
newIV[1] = (byte) (c.getIndex() & 0xFF);
IV = Optional.of(newIV);
// if we have an offset we can't calculate the hash anymore
// we need a new IV
if (streamOffset > 0) {
streamFilesize = size;
streamOffset -= 16;
streamFilesize += 16;
// We need to get the current IV as soon as we get the InputStream.
IV = Optional.empty();
}
}
NUSDataProvider dataProvider = title.getDataProvider();
InputStream in = dataProvider.readContentAsStream(c, streamOffset, streamFilesize);
try {
NUSDecryption nusdecryption = new NUSDecryption(title.getTicket().get());
Optional<byte[]> h3HashedOpt = Optional.empty();
if (c.isHashed()) {
h3HashedOpt = dataProvider.getContentH3Hash(c);
} else {
if (!IV.isPresent()) {
// If we read with an offset > 16 we need the previous 16 bytes because they are the IV.
// The input stream has been prepared to start 16 bytes earlier on this case.
int toRead = 16;
byte[] data = new byte[toRead];
int readTotal = 0;
while (readTotal < toRead) {
int res = in.read(data, readTotal, toRead - readTotal);
StreamUtils.checkForException(in);
if (res < 0) {
// This should NEVER happen.
throw new IOException();
}
readTotal += res;
}
IV = Optional.of(Arrays.copyOfRange(data, 0, toRead));
if (c.isEncrypted()) {
if (c.isHashed()) {
return decryptFSTEntryToStreamHashed(entry, outputStream, offset, size);
} else {
return decryptFSTEntryToStreamNonHashed(entry, outputStream, offset, size);
}
} else {
NUSDecryption nusdecryption = new NUSDecryption(title.getTicket().get());
InputStream in = title.getDataProvider().readContentAsStream(c, offset, size);
return nusdecryption.decryptStreamsNonEncrypted(in, outputStream, offset, size, c);
}
return nusdecryption.decryptStreams(in, outputStream, payloadOffset, size, c, IV, h3HashedOpt, size != entry.getFileSize());
} catch (CheckSumWrongException e) {
if (c.isUNKNWNFlag1Set()) {
log.info("Hash doesn't match. But file is optional. Don't worry.");

52
src/de/mas/wiiu/jnus/utils/cryptography/NUSDecryption.java
View File

@ -20,7 +20,6 @@ import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
@ -140,7 +139,7 @@ public class NUSDecryption extends AESDecryption {
} finally {
StreamUtils.closeAll(inputStream, outputStream);
}
if(written < filesize) {
if (written < filesize) {
throw new IOException("Failed to read. Missing " + (filesize - written));
}
}
@ -225,27 +224,38 @@ public class NUSDecryption extends AESDecryption {
return output;
}
public boolean decryptStreams(InputStream inputStream, OutputStream outputStream, long offset, long size, Content content, Optional<byte[]> IV,
Optional<byte[]> h3HashHashed, boolean partial) throws IOException, CheckSumWrongException, NoSuchAlgorithmException {
long encryptedFileSize = content.getEncryptedFileSize();
public boolean decryptStreamsHashed(InputStream inputStream, OutputStream outputStream, long offset, long size, Optional<byte[]> h3HashHashed)
throws IOException, CheckSumWrongException, NoSuchAlgorithmException {
try {
if (content.isEncrypted()) {
if (content.isHashed()) {
byte[] h3 = h3HashHashed.orElseThrow(() -> new FileNotFoundException("h3 hash not found."));
decryptFileStreamHashed(inputStream, outputStream, offset, size, h3);
} else {
byte[] h3Hash = content.getSHA2Hash();
// Ignore the h3hash if we don't read the whole file.
if (partial) {
h3Hash = null;
}
decryptFileStream(inputStream, outputStream, offset, size, IV.orElseThrow(() -> new IOException("Missing IV")), h3Hash, encryptedFileSize);
}
} else {
StreamUtils.saveInputStreamToOutputStreamWithHash(inputStream, outputStream, size, content.getSHA2Hash(), encryptedFileSize);
byte[] h3 = h3HashHashed.orElseThrow(() -> new FileNotFoundException("h3 hash not found."));
decryptFileStreamHashed(inputStream, outputStream, offset, size, h3);
} finally {
StreamUtils.closeAll(inputStream, outputStream);
}
return true;
}
public boolean decryptStreamsNonEncrypted(InputStream inputStream, OutputStream outputStream, long offset, long size, Content content)
throws IOException, CheckSumWrongException, NoSuchAlgorithmException {
try {
StreamUtils.saveInputStreamToOutputStreamWithHash(inputStream, outputStream, size, content.getSHA2Hash(), content.getEncryptedFileSize());
} finally {
StreamUtils.closeAll(inputStream, outputStream);
}
return true;
}
public boolean decryptStreamsNonHashed(InputStream inputStream, OutputStream outputStream, long offset, long size, Content content, byte[] IV,
boolean partial) throws IOException, CheckSumWrongException {
try {
byte[] h3Hash = content.getSHA2Hash();
// Ignore the h3hash if we don't read the whole file.
if (partial) {
h3Hash = null;
}
decryptFileStream(inputStream, outputStream, offset, size, IV, h3Hash, content.getEncryptedFileSize());
} finally {
StreamUtils.closeAll(inputStream, outputStream);
}