protected internal override void CopyContent(PdfObject from, PdfDocument document)
{
base.CopyContent(from, document);
iText.Kernel.Pdf.PdfPrimitiveObject @object = (iText.Kernel.Pdf.PdfPrimitiveObject)from;
if (@object.content != null)
{
content = JavaUtil.ArraysCopyOf(@object.content, @object.content.Length);
}
}
internal FontCacheBytesKey(byte[] fontBytes)
{
if (fontBytes != null)
{
int maxBytesNum = 10000;
this.firstFontBytes = fontBytes.Length > maxBytesNum?JavaUtil.ArraysCopyOf(fontBytes, maxBytesNum) : fontBytes;
this.fontLength = fontBytes.Length;
}
this.hashcode = CalcHashCode();
}
/// <summary>Compute layout margins.</summary>
/// <returns>the float values of the margins</returns>
internal virtual float[] ComputeLayoutMargins()
{
float[] layoutMargins = JavaUtil.ArraysCopyOf(margins, margins.Length);
for (int i = 0; i < borders.Length; ++i)
{
float width = borders[i] != null ? borders[i].GetWidth() : 0;
layoutMargins[i] += width;
}
for (int i = 0; i < paddings.Length; ++i)
{
layoutMargins[i] += paddings[i];
}
return(layoutMargins);
}
public virtual void ConstructMatrix(PngImageData pngImageData)
{
PngChromaticities pngChromaticities = pngImageData.GetPngChromaticities();
float z = pngChromaticities.GetYW() * ((pngChromaticities.GetXG() - pngChromaticities.GetXB()) * pngChromaticities
.GetYR() - (pngChromaticities.GetXR() - pngChromaticities.GetXB()) * pngChromaticities.GetYG() + (pngChromaticities
.GetXR() - pngChromaticities.GetXG()) * pngChromaticities.GetYB());
float YA = pngChromaticities.GetYR() * ((pngChromaticities.GetXG() - pngChromaticities.GetXB()) * pngChromaticities
.GetYW() - (pngChromaticities.GetXW() - pngChromaticities.GetXB()) * pngChromaticities.GetYG() + (pngChromaticities
.GetXW() - pngChromaticities.GetXG()) * pngChromaticities.GetYB()) / z;
float XA = YA * pngChromaticities.GetXR() / pngChromaticities.GetYR();
float ZA = YA * ((1 - pngChromaticities.GetXR()) / pngChromaticities.GetYR() - 1);
float YB = -pngChromaticities.GetYG() * ((pngChromaticities.GetXR() - pngChromaticities.GetXB()) * pngChromaticities
.GetYW() - (pngChromaticities.GetXW() - pngChromaticities.GetXB()) * pngChromaticities.GetYR() + (pngChromaticities
.GetXW() - pngChromaticities.GetXR()) * pngChromaticities.GetYB()) / z;
float XB = YB * pngChromaticities.GetXG() / pngChromaticities.GetYG();
float ZB = YB * ((1 - pngChromaticities.GetXG()) / pngChromaticities.GetYG() - 1);
float YC = pngChromaticities.GetYB() * ((pngChromaticities.GetXR() - pngChromaticities.GetXG()) * pngChromaticities
.GetYW() - (pngChromaticities.GetXW() - pngChromaticities.GetXG()) * pngChromaticities.GetYW() + (pngChromaticities
.GetXW() - pngChromaticities.GetXR()) * pngChromaticities.GetYG()) / z;
float XC = YC * pngChromaticities.GetXB() / pngChromaticities.GetYB();
float ZC = YC * ((1 - pngChromaticities.GetXB()) / pngChromaticities.GetYB() - 1);
float XW = XA + XB + XC;
float YW = 1;
float ZW = ZA + ZB + ZC;
float[] wpa = new float[3];
wpa[0] = XW;
wpa[1] = YW;
wpa[2] = ZW;
this.wp = JavaUtil.ArraysCopyOf(wpa, 3);
float[] matrix = new float[9];
matrix[0] = XA;
matrix[1] = YA;
matrix[2] = ZA;
matrix[3] = XB;
matrix[4] = YB;
matrix[5] = ZB;
matrix[6] = XC;
matrix[7] = YC;
matrix[8] = ZC;
this.matrix = JavaUtil.ArraysCopyOf(matrix, 9);
}
private void InitKeyAndFillDictionary(PdfDictionary encryptionDictionary, byte[] userPassword, byte[] ownerPassword
, int permissions, bool encryptMetadata, bool embeddedFilesOnly)
{
ownerPassword = GenerateOwnerPasswordIfNullOrEmpty(ownerPassword);
permissions |= PERMS_MASK_1_FOR_REVISION_3_OR_GREATER;
permissions &= PERMS_MASK_2;
try {
byte[] userKey;
byte[] ownerKey;
byte[] ueKey;
byte[] oeKey;
byte[] aes256Perms;
if (userPassword == null)
{
userPassword = new byte[0];
}
else
{
if (userPassword.Length > 127)
{
userPassword = JavaUtil.ArraysCopyOf(userPassword, 127);
}
}
if (ownerPassword.Length > 127)
{
ownerPassword = JavaUtil.ArraysCopyOf(ownerPassword, 127);
}
// first 8 bytes are validation salt; second 8 bytes are key salt
byte[] userValAndKeySalt = IVGenerator.GetIV(16);
byte[] ownerValAndKeySalt = IVGenerator.GetIV(16);
nextObjectKey = IVGenerator.GetIV(32);
nextObjectKeySize = 32;
byte[] hash;
// Algorithm 8.1
hash = ComputeHash(userPassword, userValAndKeySalt, 0, 8);
userKey = JavaUtil.ArraysCopyOf(hash, 48);
Array.Copy(userValAndKeySalt, 0, userKey, 32, 16);
// Algorithm 8.2
hash = ComputeHash(userPassword, userValAndKeySalt, 8, 8);
AESCipherCBCnoPad ac = new AESCipherCBCnoPad(true, hash);
ueKey = ac.ProcessBlock(nextObjectKey, 0, nextObjectKey.Length);
// Algorithm 9.1
hash = ComputeHash(ownerPassword, ownerValAndKeySalt, 0, 8, userKey);
ownerKey = JavaUtil.ArraysCopyOf(hash, 48);
Array.Copy(ownerValAndKeySalt, 0, ownerKey, 32, 16);
// Algorithm 9.2
hash = ComputeHash(ownerPassword, ownerValAndKeySalt, 8, 8, userKey);
ac = new AESCipherCBCnoPad(true, hash);
oeKey = ac.ProcessBlock(nextObjectKey, 0, nextObjectKey.Length);
// Algorithm 10
byte[] permsp = IVGenerator.GetIV(16);
permsp[0] = (byte)permissions;
permsp[1] = (byte)(permissions >> 8);
permsp[2] = (byte)(permissions >> 16);
permsp[3] = (byte)(permissions >> 24);
permsp[4] = (byte)(255);
permsp[5] = (byte)(255);
permsp[6] = (byte)(255);
permsp[7] = (byte)(255);
permsp[8] = encryptMetadata ? (byte)'T' : (byte)'F';
permsp[9] = (byte)'a';
permsp[10] = (byte)'d';
permsp[11] = (byte)'b';
ac = new AESCipherCBCnoPad(true, nextObjectKey);
aes256Perms = ac.ProcessBlock(permsp, 0, permsp.Length);
this.permissions = permissions;
this.encryptMetadata = encryptMetadata;
SetStandardHandlerDicEntries(encryptionDictionary, userKey, ownerKey);
SetAES256DicEntries(encryptionDictionary, oeKey, ueKey, aes256Perms, encryptMetadata, embeddedFilesOnly);
}
catch (Exception ex) {
throw new PdfException(PdfException.PdfEncryption, ex);
}
}
/// <exception cref="Org.BouncyCastle.Security.SecurityUtilityException"/>
private byte[] ComputeHash(byte[] password, byte[] salt, int saltOffset, int saltLen, byte[] userKey)
{
IDigest mdSha256 = DigestUtilities.GetDigest("SHA-256");
mdSha256.Update(password);
mdSha256.Update(salt, saltOffset, saltLen);
if (userKey != null)
{
mdSha256.Update(userKey);
}
byte[] k = mdSha256.Digest();
if (isPdf2)
{
// See 7.6.4.3.3 "Algorithm 2.B"
IDigest mdSha384 = DigestUtilities.GetDigest("SHA-384");
IDigest mdSha512 = DigestUtilities.GetDigest("SHA-512");
int userKeyLen = userKey != null ? userKey.Length : 0;
int passAndUserKeyLen = password.Length + userKeyLen;
// k1 repetition length
int k1RepLen;
int roundNum = 0;
while (true)
{
// a)
k1RepLen = passAndUserKeyLen + k.Length;
byte[] k1 = new byte[k1RepLen * 64];
Array.Copy(password, 0, k1, 0, password.Length);
Array.Copy(k, 0, k1, password.Length, k.Length);
if (userKey != null)
{
Array.Copy(userKey, 0, k1, password.Length + k.Length, userKeyLen);
}
for (int i = 1; i < 64; ++i)
{
Array.Copy(k1, 0, k1, k1RepLen * i, k1RepLen);
}
// b)
AESCipherCBCnoPad cipher = new AESCipherCBCnoPad(true, JavaUtil.ArraysCopyOf(k, 16), JavaUtil.ArraysCopyOfRange
(k, 16, 32));
byte[] e = cipher.ProcessBlock(k1, 0, k1.Length);
// c)
IDigest md = null;
BigInteger i_1 = new BigInteger(1, JavaUtil.ArraysCopyOf(e, 16));
int remainder = i_1.Remainder(BigInteger.ValueOf(3)).IntValue;
switch (remainder)
{
case 0: {
md = mdSha256;
break;
}
case 1: {
md = mdSha384;
break;
}
case 2: {
md = mdSha512;
break;
}
}
// d)
k = md.Digest(e);
++roundNum;
if (roundNum > 63)
{
// e)
int condVal = e[e.Length - 1] & 0xFF;
// interpreting last byte as unsigned integer
if (condVal <= roundNum - 32)
{
break;
}
}
}
k = k.Length == 32 ? k : JavaUtil.ArraysCopyOf(k, 32);
}
return(k);
}
private void InitKeyAndReadDictionary(PdfDictionary encryptionDictionary, byte[] password)
{
try {
if (password == null)
{
password = new byte[0];
}
else
{
if (password.Length > 127)
{
password = JavaUtil.ArraysCopyOf(password, 127);
}
}
isPdf2 = encryptionDictionary.GetAsNumber(PdfName.R).GetValue() == 6;
byte[] oValue = GetIsoBytes(encryptionDictionary.GetAsString(PdfName.O));
byte[] uValue = GetIsoBytes(encryptionDictionary.GetAsString(PdfName.U));
byte[] oeValue = GetIsoBytes(encryptionDictionary.GetAsString(PdfName.OE));
byte[] ueValue = GetIsoBytes(encryptionDictionary.GetAsString(PdfName.UE));
byte[] perms = GetIsoBytes(encryptionDictionary.GetAsString(PdfName.Perms));
PdfNumber pValue = (PdfNumber)encryptionDictionary.Get(PdfName.P);
this.permissions = pValue.LongValue();
byte[] hash;
hash = ComputeHash(password, oValue, VALIDATION_SALT_OFFSET, SALT_LENGTH, uValue);
usedOwnerPassword = CompareArray(hash, oValue, 32);
if (usedOwnerPassword)
{
hash = ComputeHash(password, oValue, KEY_SALT_OFFSET, SALT_LENGTH, uValue);
AESCipherCBCnoPad ac = new AESCipherCBCnoPad(false, hash);
nextObjectKey = ac.ProcessBlock(oeValue, 0, oeValue.Length);
}
else
{
hash = ComputeHash(password, uValue, VALIDATION_SALT_OFFSET, SALT_LENGTH);
if (!CompareArray(hash, uValue, 32))
{
throw new BadPasswordException(PdfException.BadUserPassword);
}
hash = ComputeHash(password, uValue, KEY_SALT_OFFSET, SALT_LENGTH);
AESCipherCBCnoPad ac = new AESCipherCBCnoPad(false, hash);
nextObjectKey = ac.ProcessBlock(ueValue, 0, ueValue.Length);
}
nextObjectKeySize = 32;
AESCipherCBCnoPad ac_1 = new AESCipherCBCnoPad(false, nextObjectKey);
byte[] decPerms = ac_1.ProcessBlock(perms, 0, perms.Length);
if (decPerms[9] != (byte)'a' || decPerms[10] != (byte)'d' || decPerms[11] != (byte)'b')
{
throw new BadPasswordException(PdfException.BadUserPassword);
}
int permissionsDecoded = (decPerms[0] & 0xff) | ((decPerms[1] & 0xff) << 8) | ((decPerms[2] & 0xff) << 16)
| ((decPerms[3] & 0xff) << 24);
bool encryptMetadata = decPerms[8] == (byte)'T';
bool?encryptMetadataEntry = encryptionDictionary.GetAsBool(PdfName.EncryptMetadata);
if (permissionsDecoded != permissions || encryptMetadataEntry != null && encryptMetadata != encryptMetadataEntry
)
{
ILog logger = LogManager.GetLogger(typeof(iText.Kernel.Crypto.Securityhandler.StandardHandlerUsingAes256));
logger.Error(iText.IO.LogMessageConstant.ENCRYPTION_ENTRIES_P_AND_ENCRYPT_METADATA_NOT_CORRESPOND_PERMS_ENTRY
);
}
this.permissions = permissionsDecoded;
this.encryptMetadata = encryptMetadata;
}
catch (BadPasswordException ex) {
throw;
}
catch (Exception ex) {
throw new PdfException(PdfException.PdfEncryption, ex);
}
}
