/**
* Sets the certificate encryption options for this document. An array of one or more public certificates
* must be provided together with an array of the same size for the permissions for each certificate.
* The open permissions for the document can be
* AllowPrinting, AllowModifyContents, AllowCopy, AllowModifyAnnotations,
* AllowFillIn, AllowScreenReaders, AllowAssembly and AllowDegradedPrinting.
* The permissions can be combined by ORing them.
* Optionally DO_NOT_ENCRYPT_METADATA can be ored to output the metadata in cleartext
* @param certs the public certificates to be used for the encryption
* @param permissions the user permissions for each of the certicates
* @param encryptionType the type of encryption. It can be one of STANDARD_ENCRYPTION_40, STANDARD_ENCRYPTION_128 or ENCRYPTION_AES128.
* @throws DocumentException if the document is already open
*/
public void SetEncryption(X509Certificate[] certs, int[] permissions, int encryptionType)
{
if (pdf.IsOpen())
throw new DocumentException("Encryption can only be added before opening the document.");
crypto = new PdfEncryption();
if (certs != null) {
for (int i=0; i < certs.Length; i++) {
crypto.AddRecipient(certs[i], permissions[i]);
}
}
crypto.SetCryptoMode(encryptionType, 0);
crypto.GetEncryptionDictionary();
}
/** Sets the encryption options for this document. The userPassword and the
* ownerPassword can be null or have zero length. In this case the ownerPassword
* is replaced by a random string. The open permissions for the document can be
* AllowPrinting, AllowModifyContents, AllowCopy, AllowModifyAnnotations,
* AllowFillIn, AllowScreenReaders, AllowAssembly and AllowDegradedPrinting.
* The permissions can be combined by ORing them.
* @param userPassword the user password. Can be null or empty
* @param ownerPassword the owner password. Can be null or empty
* @param permissions the user permissions
* @param encryptionType the type of encryption. It can be one of STANDARD_ENCRYPTION_40, STANDARD_ENCRYPTION_128 or ENCRYPTION_AES128.
* Optionally DO_NOT_ENCRYPT_METADATA can be ored to output the metadata in cleartext
* @throws DocumentException if the document is already open
*/
public void SetEncryption(byte[] userPassword, byte[] ownerPassword, int permissions, int encryptionType)
{
if (pdf.IsOpen())
throw new DocumentException("Encryption can only be added before opening the document.");
crypto = new PdfEncryption();
crypto.SetCryptoMode(encryptionType, 0);
crypto.SetupAllKeys(userPassword, ownerPassword, permissions);
}
