/// <summary>Returns the value associated to this key as a Boolean.</summary>
/// <remarks>Returns the value associated to this key as a Boolean. If the value isn't a PdfBoolean, null is returned.
/// </remarks>
/// <param name="key">the key of which the associated value needs to be returned</param>
/// <returns>Boolean associated with this key</returns>
public virtual bool?GetAsBool(PdfName key)
{
PdfBoolean b = GetAsBoolean(key);
bool? booleanValue = null;
if (b != null)
{
booleanValue = b.GetValue();
}
return(booleanValue);
}
private int ReadAndSetCryptoModeForPubSecHandler(PdfDictionary encDict)
{
int cryptoMode;
int length = 0;
PdfNumber vValue = encDict.GetAsNumber(PdfName.V);
if (vValue == null)
{
throw new PdfException(PdfException.IllegalVValue);
}
int v = vValue.IntValue();
switch (v)
{
case 1: {
cryptoMode = EncryptionConstants.STANDARD_ENCRYPTION_40;
length = 40;
break;
}
case 2: {
PdfNumber lengthValue = encDict.GetAsNumber(PdfName.Length);
if (lengthValue == null)
{
throw new PdfException(PdfException.IllegalLengthValue);
}
length = lengthValue.IntValue();
if (length > 128 || length < 40 || length % 8 != 0)
{
throw new PdfException(PdfException.IllegalLengthValue);
}
cryptoMode = EncryptionConstants.STANDARD_ENCRYPTION_128;
break;
}
case 4:
case 5: {
PdfDictionary dic = encDict.GetAsDictionary(PdfName.CF);
if (dic == null)
{
throw new PdfException(PdfException.CfNotFoundEncryption);
}
dic = (PdfDictionary)dic.Get(PdfName.DefaultCryptFilter);
if (dic == null)
{
throw new PdfException(PdfException.DefaultcryptfilterNotFoundEncryption);
}
if (PdfName.V2.Equals(dic.Get(PdfName.CFM)))
{
cryptoMode = EncryptionConstants.STANDARD_ENCRYPTION_128;
length = 128;
}
else
{
if (PdfName.AESV2.Equals(dic.Get(PdfName.CFM)))
{
cryptoMode = EncryptionConstants.ENCRYPTION_AES_128;
length = 128;
}
else
{
if (PdfName.AESV3.Equals(dic.Get(PdfName.CFM)))
{
cryptoMode = EncryptionConstants.ENCRYPTION_AES_256;
length = 256;
}
else
{
throw new PdfException(PdfException.NoCompatibleEncryptionFound);
}
}
}
PdfBoolean em = dic.GetAsBoolean(PdfName.EncryptMetadata);
if (em != null && !em.GetValue())
{
cryptoMode |= EncryptionConstants.DO_NOT_ENCRYPT_METADATA;
}
break;
}
default: {
throw new PdfException(PdfException.UnknownEncryptionTypeVEq1, vValue);
}
}
return(SetCryptoMode(cryptoMode, length));
}
private int ReadAndSetCryptoModeForStdHandler(PdfDictionary encDict)
{
int cryptoMode;
int length = 0;
PdfNumber rValue = encDict.GetAsNumber(PdfName.R);
if (rValue == null)
{
throw new PdfException(PdfException.IllegalRValue);
}
int revision = rValue.IntValue();
switch (revision)
{
case 2: {
cryptoMode = EncryptionConstants.STANDARD_ENCRYPTION_40;
break;
}
case 3: {
PdfNumber lengthValue = encDict.GetAsNumber(PdfName.Length);
if (lengthValue == null)
{
throw new PdfException(PdfException.IllegalLengthValue);
}
length = lengthValue.IntValue();
if (length > 128 || length < 40 || length % 8 != 0)
{
throw new PdfException(PdfException.IllegalLengthValue);
}
cryptoMode = EncryptionConstants.STANDARD_ENCRYPTION_128;
break;
}
case 4: {
PdfDictionary dic = (PdfDictionary)encDict.Get(PdfName.CF);
if (dic == null)
{
throw new PdfException(PdfException.CfNotFoundEncryption);
}
dic = (PdfDictionary)dic.Get(PdfName.StdCF);
if (dic == null)
{
throw new PdfException(PdfException.StdcfNotFoundEncryption);
}
if (PdfName.V2.Equals(dic.Get(PdfName.CFM)))
{
cryptoMode = EncryptionConstants.STANDARD_ENCRYPTION_128;
}
else
{
if (PdfName.AESV2.Equals(dic.Get(PdfName.CFM)))
{
cryptoMode = EncryptionConstants.ENCRYPTION_AES_128;
}
else
{
throw new PdfException(PdfException.NoCompatibleEncryptionFound);
}
}
PdfBoolean em = encDict.GetAsBoolean(PdfName.EncryptMetadata);
if (em != null && !em.GetValue())
{
cryptoMode |= EncryptionConstants.DO_NOT_ENCRYPT_METADATA;
}
break;
}
case 5:
case 6: {
cryptoMode = EncryptionConstants.ENCRYPTION_AES_256;
PdfBoolean em5 = encDict.GetAsBoolean(PdfName.EncryptMetadata);
if (em5 != null && !em5.GetValue())
{
cryptoMode |= EncryptionConstants.DO_NOT_ENCRYPT_METADATA;
}
break;
}
default: {
throw new PdfException(PdfException.UnknownEncryptionTypeREq1).SetMessageParams(rValue);
}
}
revision = SetCryptoMode(cryptoMode, length);
return(revision);
}