Foxit PDF SDK

Public Member Functions | List of all members
com.foxit.sdk.pdf.CustomSecurityCallback Class Reference
Inheritance diagram for com.foxit.sdk.pdf.CustomSecurityCallback:

## Public Member Functions
java.lang.Object | createContext (String filter, String sub_filter, String encrypt_info)
| A callback function used to create context for encryption and decryption. More...
byte[] | decryptData (java.lang.Object decryptor, byte[] encrypted_data)
| A callback function used to decrypt the encrypted data. More...
boolean | encryptData (java.lang.Object context, int obj_num, int gen_num, byte[] src_data, byte[] out_dst_buffer)
| A callback function used to get encrypted data. More...
byte[] | finishDecryptor (java.lang.Object decryptor)
| A callback function used to finish the decryption. More...
int | getCipher (java.lang.Object context)
| A callback function used to get the cipher type. More...
int | getDecryptedSize (java.lang.Object context, int src_data_size)
| A callback function used to get the estimated decrypted data size. More...
int | getEncryptedSize (java.lang.Object context, int obj_num, int gen_num, byte[] src_data)
| A callback function used to get the estimated encrypted size. More...
byte[] | getEncryptKey (java.lang.Object context)
| A callback function used to get the encryption key. More...
int | getSecurityType ()
| Get the encryption type of security callback. More...
int | getUserPermissions (java.lang.Object context, int user_permission)
| A callback function used to get the user permissions. More...
boolean | isOwner (java.lang.Object context)
| A callback function used to check if current user is the owner of the PDF document. More...
boolean | releaseContext (java.lang.Object context)
| A callback function used to release the context for encryption and decryption. More...
java.lang.Object | startDecryptor (java.lang.Object context, int obj_num, int gen_num)
| A callback function used to start a decryption. More...
boolean | useStandardCryptoMethod (java.lang.Object context)
| A callback function to check if to use standard crypto method or custom crypto method. More...
Public Member Functions inherited from com.foxit.sdk.pdf.SecurityCallback
void | release ()
| A callback function used to release current callback object itself. More...

## Detailed Description

This class represents a callback object for custom decryption and encryption. If user wants to use custom security callback, user should inherit this callback class and implement the pure virtual functions (as callback functions), and then register the custom security callback object to Foxit PDF SDK by function common.Library.registerSecurityCallback with with any custom filter name (following the PDF name conventions). Function common.Library.unregisterSecurityCallback can be called to unregister the security callback object with the registered filter name.

## Member Function Documentation

## ◆ createContext()

java.lang.Object com.foxit.sdk.pdf.CustomSecurityCallback.createContext | ( | String | filter,
|  | String | sub_filter,
|  | String | encrypt_info
| ) |  |

A callback function used to create context for encryption and decryption.

Parameters

  [in] | filter | The filter name of the custom security callback object.
  [in] | sub_filter | The sub filter name that specifies the syntax of the encryption dictionary contents.
  [in] | encrypt_info | The encryption information of the PDF document.

Note
  User should implement this callback function.

Returns
  The encryption context.

## ◆ decryptData()

byte[] com.foxit.sdk.pdf.CustomSecurityCallback.decryptData | ( | java.lang.Object | decryptor,
|  | byte[] | encrypted_data
| ) |  |

A callback function used to decrypt the encrypted data.

Parameters

  [in] | decryptor | The decryptor implemented and created by user, returned by callback function CustomSecurityCallback.startDecryptor .
  [in] | encrypted_data | The buffer which stores the encrypted data.

Note
  User should implement this callback function.

Returns
  The decrypted data content.

## ◆ encryptData()

boolean com.foxit.sdk.pdf.CustomSecurityCallback.encryptData | ( | java.lang.Object | context,
|  | int | obj_num,
|  | int | gen_num,
|  | byte[] | src_data,
|  | byte[] | out_dst_buffer
| ) |  |

A callback function used to get encrypted data.

Parameters

  [in] | context | The context for encryption and decryption, returned by callback function CustomSecurityCallback.createContext .
  [in] | obj_num | The object number for a PDF object.
  [in] | gen_num | The generation number for a PDF object.
  [in] | src_data | The buffer which stores the plain text to be encrypted.
  [out] | out_dst_buffer | Output parameter that receives the encrypted content.

Note
  User should implement this callback function.

Returns
  true means success, while false means failure.

## ◆ finishDecryptor()

byte[] com.foxit.sdk.pdf.CustomSecurityCallback.finishDecryptor | ( | java.lang.Object | decryptor | ) |

A callback function used to finish the decryption.

Parameters

  [in] | decryptor | The decryptor implemented and created by user, returned by callback function CustomSecurityCallback.startDecryptor .

Note
  User should implement this callback function.

Returns
  The decrypted data content.

## ◆ getCipher()

int com.foxit.sdk.pdf.CustomSecurityCallback.getCipher | ( | java.lang.Object | context | ) |

A callback function used to get the cipher type.

Parameters

  [in] | context | The context for encryption and decryption, returned by callback function CustomSecurityCallback.createContext .

Note
  User should implement this callback function.

Returns
  The cipher type. Please refer to values starting from com.foxit.sdk.pdf.SecurityHandler.e_CipherNone and this should be one of these values.

## ◆ getDecryptedSize()

int com.foxit.sdk.pdf.CustomSecurityCallback.getDecryptedSize | ( | java.lang.Object | context,
|  | int | src_data_size
| ) |  |

A callback function used to get the estimated decrypted data size.

Parameters

  [in] | context | The context for encryption and decryption, returned by callback function CustomSecurityCallback.createContext .
  [in] | src_data_size | Size of source data which is to be decrypted.

Note
  User should implement this callback function.

Returns
  The estimated decrypted data size.

## ◆ getEncryptedSize()

int com.foxit.sdk.pdf.CustomSecurityCallback.getEncryptedSize | ( | java.lang.Object | context,
|  | int | obj_num,
|  | int | gen_num,
|  | byte[] | src_data
| ) |  |

A callback function used to get the estimated encrypted size.

Parameters

  [in] | context | The context for encryption and decryption, returned by callback function CustomSecurityCallback.createContext .
  [in] | obj_num | The object number for a PDF object.
  [in] | gen_num | The generation number for a PDF object.
  [in] | src_data | The buffer which stores the plain text to be encrypted.

Note
  User should implement this callback function.

Returns
  The estimated encrypted size.

## ◆ getEncryptKey()

byte[] com.foxit.sdk.pdf.CustomSecurityCallback.getEncryptKey | ( | java.lang.Object | context | ) |

A callback function used to get the encryption key.

Parameters

  [in] | context | The context for encryption and decryption, returned by callback function CustomSecurityCallback.createContext .

Note
  User should implement this callback function.

Returns
  The encryption key.

## ◆ getSecurityType()

int com.foxit.sdk.pdf.CustomSecurityCallback.getSecurityType | ( |  | ) |

Get the encryption type of security callback.

Note
  User should not override this function, otherwise there will be unexpected behavior.

Returns
  The encryption type. It would always be com.foxit.sdk.pdf.PDFDoc.e_EncryptCustom .

Reimplemented from com.foxit.sdk.pdf.SecurityCallback.

Reimplemented in com.foxit.sdk.pdf.RMSSecurityCallback.

## ◆ getUserPermissions()

int com.foxit.sdk.pdf.CustomSecurityCallback.getUserPermissions | ( | java.lang.Object | context,
|  | int | user_permission
| ) |  |

A callback function used to get the user permissions.

Parameters

  [in] | context | The context for encryption and decryption, returned by callback function CustomSecurityCallback.createContext .
  [in] | user_permission | Original permission settings of the document. Please refer to values starting from com.foxit.sdk.pdf.PDFDoc.e_PermPrint and this would be one or combination of these values.

Note
  User should implement this callback function.

Returns
  The new user permissions. Please refer to values starting from com.foxit.sdk.pdf.PDFDoc.e_PermPrint and this should be one or combination of these values.

## ◆ isOwner()

boolean com.foxit.sdk.pdf.CustomSecurityCallback.isOwner | ( | java.lang.Object | context | ) |

A callback function used to check if current user is the owner of the PDF document.

Parameters

  [in] | context | The context for encryption and decryption, returned by callback function CustomSecurityCallback.createContext .

Note
  User should implement this callback function.

Returns
  true means current user is the owner, and false means current user is not the owner.

## ◆ releaseContext()

boolean com.foxit.sdk.pdf.CustomSecurityCallback.releaseContext | ( | java.lang.Object | context | ) |

A callback function used to release the context for encryption and decryption.

Parameters

  [in] | context | The context for encryption and decryption, returned by callback function CustomSecurityCallback.createContext .

Note
  User should implement this callback function.

Returns
  true means success, while false means failure.

## ◆ startDecryptor()

java.lang.Object com.foxit.sdk.pdf.CustomSecurityCallback.startDecryptor | ( | java.lang.Object | context,
|  | int | obj_num,
|  | int | gen_num
| ) |  |

A callback function used to start a decryption.

Parameters

  [in] | context | The context for encryption and decryption, returned by callback function CustomSecurityCallback.createContext .
  [in] | obj_num | The object number for a PDF object.
  [in] | gen_num | The generation number for a PDF object.

Note
  User should implement this callback function.

Returns
  A decryptor implemented and created by user.

## ◆ useStandardCryptoMethod()

boolean com.foxit.sdk.pdf.CustomSecurityCallback.useStandardCryptoMethod | ( | java.lang.Object | context | ) |

A callback function to check if to use standard crypto method or custom crypto method.

Parameters

  [in] | context | The context for encryption and decryption, returned by callback function CustomSecurityCallback.createContext .

Returns

      <ul>
      <li>
      <b>true</b> means to use standard crypto method. In this case, callback functions @link CustomSecurityCallback::getDecryptedSize
      CustomSecurityCallback.getDecryptedSize @endlink, @link CustomSecurityCallback::startDecryptor CustomSecurityCallback.startDecryptor @endlink,
      @link CustomSecurityCallback::decryptData CustomSecurityCallback.decryptData @endlink, @link CustomSecurityCallback::finishDecryptor
      CustomSecurityCallback.finishDecryptor @endlink, @link CustomSecurityCallback::getEncryptedSize CustomSecurityCallback.getEncryptedSize @endlink,
      and @link CustomSecurityCallback::encryptData CustomSecurityCallback.encryptData @endlink will be uselss and user can just use empty
      implementation for them.
      </li>
      <li>
      <b>false</b> means use custom crypto method. In this case, please ensure callback functions mentioned above have all been implemented.
      </li>
      </ul>