mirror of
https://github.com/unidoc/unipdf.git
synced 2025-04-27 13:48:51 +08:00
108 lines
14 KiB
Go
108 lines
14 KiB
Go
//
|
|
// Copyright 2020 FoxyUtils ehf. All rights reserved.
|
|
//
|
|
// This is a commercial product and requires a license to operate.
|
|
// A trial license can be obtained at https://unidoc.io
|
|
//
|
|
// DO NOT EDIT: generated by unitwist Go source code obfuscator.
|
|
//
|
|
// Use of this source code is governed by the UniDoc End User License Agreement
|
|
// terms that can be accessed at https://unidoc.io/eula/
|
|
|
|
package crypt ;import (_f "crypto/aes";_ec "crypto/cipher";_ea "crypto/md5";_fe "crypto/rand";_d "crypto/rc4";_e "fmt";_c "github.com/unidoc/unipdf/v3/common";_ff "github.com/unidoc/unipdf/v3/core/security";_b "io";);func init (){_ddb ("\u0041\u0045\u0053V\u0032",_cf )};
|
|
|
|
// NewFilter creates CryptFilter from a corresponding dictionary.
|
|
func NewFilter (d FilterDict )(Filter ,error ){_cde ,_eg :=_fbf (d .CFM );if _eg !=nil {return nil ,_eg ;};_ffce ,_eg :=_cde (d );if _eg !=nil {return nil ,_eg ;};return _ffce ,nil ;};
|
|
|
|
// Name implements Filter interface.
|
|
func (filterAESV3 )Name ()string {return "\u0041\u0045\u0053V\u0033"};type filterAES struct{};
|
|
|
|
// FilterDict represents information from a CryptFilter dictionary.
|
|
type FilterDict struct{CFM string ;AuthEvent _ff .AuthEvent ;Length int ;};
|
|
|
|
// MakeKey implements Filter interface.
|
|
func (filterAESV2 )MakeKey (objNum ,genNum uint32 ,ekey []byte )([]byte ,error ){return _fb (objNum ,genNum ,ekey ,true );};func _fg (_gb FilterDict )(Filter ,error ){if _gb .Length ==256{_c .Log .Debug ("\u0041\u0045S\u0056\u0033\u0020c\u0072\u0079\u0070\u0074\u0020f\u0069\u006c\u0074\u0065\u0072 l\u0065\u006e\u0067\u0074\u0068\u0020\u0061\u0070\u0070\u0065\u0061\u0072\u0073\u0020\u0074\u006f\u0020\u0062e\u0020i\u006e\u0020\u0062\u0069\u0074\u0073 ra\u0074\u0068\u0065\u0072\u0020\u0074\u0068\u0061\u006e\u0020\u0062\u0079te\u0073 \u002d\u0020\u0061\u0073s\u0075m\u0069n\u0067\u0020b\u0069\u0074s \u0028\u0025\u0064\u0029",_gb .Length );_gb .Length /=8;};if _gb .Length !=0&&_gb .Length !=32{return nil ,_e .Errorf ("\u0069\u006e\u0076\u0061\u006c\u0069\u0064\u0020\u0041\u0045\u0053\u0056\u0033\u0020\u0063\u0072\u0079\u0070\u0074\u0020\u0066\u0069\u006c\u0074e\u0072\u0020\u006c\u0065\u006eg\u0074\u0068 \u0028\u0025\u0064\u0029",_gb .Length );};return filterAESV3 {},nil ;};
|
|
|
|
// HandlerVersion implements Filter interface.
|
|
func (filterAESV3 )HandlerVersion ()(V ,R int ){V ,R =5,6;return ;};func _cf (_ab FilterDict )(Filter ,error ){if _ab .Length ==128{_c .Log .Debug ("\u0041\u0045S\u0056\u0032\u0020c\u0072\u0079\u0070\u0074\u0020f\u0069\u006c\u0074\u0065\u0072 l\u0065\u006e\u0067\u0074\u0068\u0020\u0061\u0070\u0070\u0065\u0061\u0072\u0073\u0020\u0074\u006f\u0020\u0062e\u0020i\u006e\u0020\u0062\u0069\u0074\u0073 ra\u0074\u0068\u0065\u0072\u0020\u0074\u0068\u0061\u006e\u0020\u0062\u0079te\u0073 \u002d\u0020\u0061\u0073s\u0075m\u0069n\u0067\u0020b\u0069\u0074s \u0028\u0025\u0064\u0029",_ab .Length );_ab .Length /=8;};if _ab .Length !=0&&_ab .Length !=16{return nil ,_e .Errorf ("\u0069\u006e\u0076\u0061\u006c\u0069\u0064\u0020\u0041\u0045\u0053\u0056\u0032\u0020\u0063\u0072\u0079\u0070\u0074\u0020\u0066\u0069\u006c\u0074e\u0072\u0020\u006c\u0065\u006eg\u0074\u0068 \u0028\u0025\u0064\u0029",_ab .Length );};return filterAESV2 {},nil ;};
|
|
|
|
// NewFilterAESV2 creates an AES-based filter with a 128 bit key (AESV2).
|
|
func NewFilterAESV2 ()Filter {_ed ,_a :=_cf (FilterDict {});if _a !=nil {_c .Log .Error ("E\u0052\u0052\u004f\u0052\u003a\u0020\u0063\u006f\u0075l\u0064\u0020\u006e\u006f\u0074\u0020\u0063re\u0061\u0074\u0065\u0020A\u0045\u0053\u0020\u0056\u0032\u0020\u0063\u0072\u0079pt\u0020\u0066i\u006c\u0074\u0065\u0072\u003a\u0020\u0025\u0076",_a );return filterAESV2 {};};return _ed ;};func init (){_ddb ("\u0041\u0045\u0053V\u0033",_fg )};func _ddb (_da string ,_aac filterFunc ){if _ ,_eb :=_bce [_da ];_eb {panic ("\u0061l\u0072e\u0061\u0064\u0079\u0020\u0072e\u0067\u0069s\u0074\u0065\u0072\u0065\u0064");};_bce [_da ]=_aac ;};
|
|
|
|
// NewIdentity creates an identity filter that bypasses all data without changes.
|
|
func NewIdentity ()Filter {return filterIdentity {}};
|
|
|
|
// Filter is a common interface for crypt filter methods.
|
|
type Filter interface{
|
|
|
|
// Name returns a name of the filter that should be used in CFM field of Encrypt dictionary.
|
|
Name ()string ;
|
|
|
|
// KeyLength returns a length of the encryption key in bytes.
|
|
KeyLength ()int ;
|
|
|
|
// PDFVersion reports the minimal version of PDF document that introduced this filter.
|
|
PDFVersion ()[2]int ;
|
|
|
|
// HandlerVersion reports V and R parameters that should be used for this filter.
|
|
HandlerVersion ()(V ,R int );
|
|
|
|
// MakeKey generates a object encryption key based on file encryption key and object numbers.
|
|
// Used only for legacy filters - AESV3 doesn't change the key for each object.
|
|
MakeKey (_df ,_cb uint32 ,_fcd []byte )([]byte ,error );
|
|
|
|
// EncryptBytes encrypts a buffer using object encryption key, as returned by MakeKey.
|
|
// Implementation may reuse a buffer and encrypt data in-place.
|
|
EncryptBytes (_adfd []byte ,_ece []byte )([]byte ,error );
|
|
|
|
// DecryptBytes decrypts a buffer using object encryption key, as returned by MakeKey.
|
|
// Implementation may reuse a buffer and decrypt data in-place.
|
|
DecryptBytes (_dcb []byte ,_ecgg []byte )([]byte ,error );};
|
|
|
|
// KeyLength implements Filter interface.
|
|
func (filterAESV2 )KeyLength ()int {return 128/8};var _ Filter =filterV2 {};
|
|
|
|
// PDFVersion implements Filter interface.
|
|
func (filterAESV2 )PDFVersion ()[2]int {return [2]int {1,5}};
|
|
|
|
// KeyLength implements Filter interface.
|
|
func (filterAESV3 )KeyLength ()int {return 256/8};
|
|
|
|
// NewFilterAESV3 creates an AES-based filter with a 256 bit key (AESV3).
|
|
func NewFilterAESV3 ()Filter {_ad ,_ef :=_fg (FilterDict {});if _ef !=nil {_c .Log .Error ("E\u0052\u0052\u004f\u0052\u003a\u0020\u0063\u006f\u0075l\u0064\u0020\u006e\u006f\u0074\u0020\u0063re\u0061\u0074\u0065\u0020A\u0045\u0053\u0020\u0056\u0033\u0020\u0063\u0072\u0079pt\u0020\u0066i\u006c\u0074\u0065\u0072\u003a\u0020\u0025\u0076",_ef );return filterAESV3 {};};return _ad ;};
|
|
|
|
// MakeKey implements Filter interface.
|
|
func (filterAESV3 )MakeKey (_ ,_ uint32 ,ekey []byte )([]byte ,error ){return ekey ,nil };func _fb (_ffc ,_bd uint32 ,_fa []byte ,_ae bool )([]byte ,error ){_dc :=make ([]byte ,len (_fa )+5);for _aee :=0;_aee < len (_fa );_aee ++{_dc [_aee ]=_fa [_aee ];};for _bga :=0;_bga < 3;_bga ++{_feg :=byte ((_ffc >>uint32 (8*_bga ))&0xff);_dc [_bga +len (_fa )]=_feg ;};for _fee :=0;_fee < 2;_fee ++{_gc :=byte ((_bd >>uint32 (8*_fee ))&0xff);_dc [_fee +len (_fa )+3]=_gc ;};if _ae {_dc =append (_dc ,0x73);_dc =append (_dc ,0x41);_dc =append (_dc ,0x6C);_dc =append (_dc ,0x54);};_dba :=_ea .New ();_dba .Write (_dc );_ffd :=_dba .Sum (nil );if len (_fa )+5< 16{return _ffd [0:len (_fa )+5],nil ;};return _ffd ,nil ;};func (filterIdentity )MakeKey (objNum ,genNum uint32 ,fkey []byte )([]byte ,error ){return fkey ,nil };
|
|
|
|
// HandlerVersion implements Filter interface.
|
|
func (_adf filterV2 )HandlerVersion ()(V ,R int ){V ,R =2,3;return ;};func init (){_ddb ("\u0056\u0032",_eab )};func (filterIdentity )EncryptBytes (p []byte ,okey []byte )([]byte ,error ){return p ,nil };func (filterAES )EncryptBytes (buf []byte ,okey []byte )([]byte ,error ){_ccc ,_ccd :=_f .NewCipher (okey );if _ccd !=nil {return nil ,_ccd ;};_c .Log .Trace ("A\u0045\u0053\u0020\u0045nc\u0072y\u0070\u0074\u0020\u0028\u0025d\u0029\u003a\u0020\u0025\u0020\u0078",len (buf ),buf );const _bc =_f .BlockSize ;_gf :=_bc -len (buf )%_bc ;for _cd :=0;_cd < _gf ;_cd ++{buf =append (buf ,byte (_gf ));};_c .Log .Trace ("\u0050a\u0064d\u0065\u0064\u0020\u0074\u006f \u0025\u0064 \u0062\u0079\u0074\u0065\u0073",len (buf ));_ac :=make ([]byte ,_bc +len (buf ));_adg :=_ac [:_bc ];if _ ,_adge :=_b .ReadFull (_fe .Reader ,_adg );_adge !=nil {return nil ,_adge ;};_aa :=_ec .NewCBCEncrypter (_ccc ,_adg );_aa .CryptBlocks (_ac [_bc :],buf );buf =_ac ;_c .Log .Trace ("\u0074\u006f\u0020(\u0025\u0064\u0029\u003a\u0020\u0025\u0020\u0078",len (buf ),buf );return buf ,nil ;};
|
|
|
|
// Name implements Filter interface.
|
|
func (filterV2 )Name ()string {return "\u0056\u0032"};var (_bce =make (map[string ]filterFunc ););func (filterIdentity )DecryptBytes (p []byte ,okey []byte )([]byte ,error ){return p ,nil };
|
|
|
|
// DecryptBytes implements Filter interface.
|
|
func (filterV2 )DecryptBytes (buf []byte ,okey []byte )([]byte ,error ){_cdg ,_ag :=_d .NewCipher (okey );if _ag !=nil {return nil ,_ag ;};_c .Log .Trace ("\u0052\u00434\u0020\u0044\u0065c\u0072\u0079\u0070\u0074\u003a\u0020\u0025\u0020\u0078",buf );_cdg .XORKeyStream (buf ,buf );_c .Log .Trace ("\u0074o\u003a\u0020\u0025\u0020\u0078",buf );return buf ,nil ;};
|
|
|
|
// PDFVersion implements Filter interface.
|
|
func (_aea filterV2 )PDFVersion ()[2]int {return [2]int {}};
|
|
|
|
// PDFVersion implements Filter interface.
|
|
func (filterAESV3 )PDFVersion ()[2]int {return [2]int {2,0}};
|
|
|
|
// HandlerVersion implements Filter interface.
|
|
func (filterAESV2 )HandlerVersion ()(V ,R int ){V ,R =4,4;return ;};var _ Filter =filterAESV3 {};func _fbf (_daa string )(filterFunc ,error ){_ebe :=_bce [_daa ];if _ebe ==nil {return nil ,_e .Errorf ("\u0075\u006e\u0073\u0075p\u0070\u006f\u0072\u0074\u0065\u0064\u0020\u0063\u0072\u0079p\u0074 \u0066\u0069\u006c\u0074\u0065\u0072\u003a \u0025\u0071",_daa );};return _ebe ,nil ;};var _ Filter =filterAESV2 {};type filterAESV3 struct{filterAES };
|
|
|
|
// Name implements Filter interface.
|
|
func (filterAESV2 )Name ()string {return "\u0041\u0045\u0053V\u0032"};
|
|
|
|
// EncryptBytes implements Filter interface.
|
|
func (filterV2 )EncryptBytes (buf []byte ,okey []byte )([]byte ,error ){_ecb ,_ee :=_d .NewCipher (okey );if _ee !=nil {return nil ,_ee ;};_c .Log .Trace ("\u0052\u00434\u0020\u0045\u006ec\u0072\u0079\u0070\u0074\u003a\u0020\u0025\u0020\u0078",buf );_ecb .XORKeyStream (buf ,buf );_c .Log .Trace ("\u0074o\u003a\u0020\u0025\u0020\u0078",buf );return buf ,nil ;};
|
|
|
|
// MakeKey implements Filter interface.
|
|
func (_bcg filterV2 )MakeKey (objNum ,genNum uint32 ,ekey []byte )([]byte ,error ){return _fb (objNum ,genNum ,ekey ,false );};
|
|
|
|
// NewFilterV2 creates a RC4-based filter with a specified key length (in bytes).
|
|
func NewFilterV2 (length int )Filter {_fc ,_dd :=_eab (FilterDict {Length :length });if _dd !=nil {_c .Log .Error ("E\u0052\u0052\u004f\u0052\u003a\u0020\u0063\u006f\u0075l\u0064\u0020\u006e\u006f\u0074\u0020\u0063re\u0061\u0074\u0065\u0020R\u0043\u0034\u0020\u0056\u0032\u0020\u0063\u0072\u0079pt\u0020\u0066i\u006c\u0074\u0065\u0072\u003a\u0020\u0025\u0076",_dd );return filterV2 {_fcb :length };};return _fc ;};type filterV2 struct{_fcb int };type filterIdentity struct{};func (filterIdentity )PDFVersion ()[2]int {return [2]int {}};type filterAESV2 struct{filterAES };func (filterIdentity )Name ()string {return "\u0049\u0064\u0065\u006e\u0074\u0069\u0074\u0079"};func (filterIdentity )KeyLength ()int {return 0};
|
|
|
|
// KeyLength implements Filter interface.
|
|
func (_ade filterV2 )KeyLength ()int {return _ade ._fcb };func (filterAES )DecryptBytes (buf []byte ,okey []byte )([]byte ,error ){_ca ,_ga :=_f .NewCipher (okey );if _ga !=nil {return nil ,_ga ;};if len (buf )< 16{_c .Log .Debug ("\u0045R\u0052\u004f\u0052\u0020\u0041\u0045\u0053\u0020\u0069\u006e\u0076a\u006c\u0069\u0064\u0020\u0062\u0075\u0066\u0020\u0025\u0073",buf );return buf ,_e .Errorf ("\u0041\u0045\u0053\u003a B\u0075\u0066\u0020\u006c\u0065\u006e\u0020\u003c\u0020\u0031\u0036\u0020\u0028\u0025d\u0029",len (buf ));};_ecg :=buf [:16];buf =buf [16:];if len (buf )%16!=0{_c .Log .Debug ("\u0020\u0069\u0076\u0020\u0028\u0025\u0064\u0029\u003a\u0020\u0025\u0020\u0078",len (_ecg ),_ecg );_c .Log .Debug ("\u0062\u0075\u0066\u0020\u0028\u0025\u0064\u0029\u003a\u0020\u0025\u0020\u0078",len (buf ),buf );return buf ,_e .Errorf ("\u0041\u0045\u0053\u0020\u0062\u0075\u0066\u0020\u006c\u0065\u006e\u0067\u0074\u0068\u0020\u006e\u006f\u0074\u0020\u006d\u0075\u006c\u0074\u0069p\u006c\u0065\u0020\u006f\u0066 \u0031\u0036 \u0028\u0025\u0064\u0029",len (buf ));};_bg :=_ec .NewCBCDecrypter (_ca ,_ecg );_c .Log .Trace ("A\u0045\u0053\u0020\u0044ec\u0072y\u0070\u0074\u0020\u0028\u0025d\u0029\u003a\u0020\u0025\u0020\u0078",len (buf ),buf );_c .Log .Trace ("\u0063\u0068\u006f\u0070\u0020\u0041\u0045\u0053\u0020\u0044\u0065c\u0072\u0079\u0070\u0074\u0020\u0028\u0025\u0064\u0029\u003a \u0025\u0020\u0078",len (buf ),buf );_bg .CryptBlocks (buf ,buf );_c .Log .Trace ("\u0074\u006f\u0020(\u0025\u0064\u0029\u003a\u0020\u0025\u0020\u0078",len (buf ),buf );if len (buf )==0{_c .Log .Trace ("\u0045\u006d\u0070\u0074\u0079\u0020b\u0075\u0066\u002c\u0020\u0072\u0065\u0074\u0075\u0072\u006e\u0069\u006e\u0067 \u0065\u006d\u0070\u0074\u0079\u0020\u0073t\u0072\u0069\u006e\u0067");return buf ,nil ;};_ceb :=int (buf [len (buf )-1]);if _ceb > len (buf ){_c .Log .Debug ("\u0049\u006c\u006c\u0065g\u0061\u006c\u0020\u0070\u0061\u0064\u0020\u006c\u0065\u006eg\u0074h\u0020\u0028\u0025\u0064\u0020\u003e\u0020%\u0064\u0029",_ceb ,len (buf ));return buf ,_e .Errorf ("\u0069n\u0076a\u006c\u0069\u0064\u0020\u0070a\u0064\u0020l\u0065\u006e\u0067\u0074\u0068");};buf =buf [:len (buf )-_ceb ];return buf ,nil ;};type filterFunc func (_gfg FilterDict )(Filter ,error );func _eab (_adb FilterDict )(Filter ,error ){if _adb .Length %8!=0{return nil ,_e .Errorf ("\u0063\u0072\u0079p\u0074\u0020\u0066\u0069\u006c\u0074\u0065\u0072\u0020\u006c\u0065\u006e\u0067\u0074\u0068\u0020\u006e\u006f\u0074\u0020\u006d\u0075\u006c\u0074\u0069\u0070\u006c\u0065\u0020o\u0066\u0020\u0038\u0020\u0028\u0025\u0064\u0029",_adb .Length );};if _adb .Length < 5||_adb .Length > 16{if _adb .Length ==40||_adb .Length ==64||_adb .Length ==128{_c .Log .Debug ("\u0053\u0054\u0041\u004e\u0044AR\u0044\u0020V\u0049\u004f\u004c\u0041\u0054\u0049\u004f\u004e\u003a\u0020\u0043\u0072\u0079\u0070\u0074\u0020\u004c\u0065\u006e\u0067\u0074\u0068\u0020\u0061\u0070\u0070\u0065\u0061\u0072s\u0020\u0074\u006f \u0062\u0065\u0020\u0069\u006e\u0020\u0062\u0069\u0074\u0073\u0020\u0072\u0061t\u0068\u0065\u0072\u0020\u0074h\u0061\u006e\u0020\u0062\u0079\u0074\u0065\u0073\u0020-\u0020\u0061s\u0073u\u006d\u0069\u006e\u0067\u0020\u0062\u0069t\u0073\u0020\u0028\u0025\u0064\u0029",_adb .Length );_adb .Length /=8;}else {return nil ,_e .Errorf ("\u0063\u0072\u0079\u0070\u0074\u0020\u0066\u0069\u006c\u0074\u0065\u0072\u0020\u006c\u0065\u006e\u0067\u0074h\u0020\u006e\u006f\u0074\u0020\u0069\u006e \u0072\u0061\u006e\u0067\u0065\u0020\u0034\u0030\u0020\u002d\u00201\u0032\u0038\u0020\u0062\u0069\u0074\u0020\u0028\u0025\u0064\u0029",_adb .Length );};};return filterV2 {_fcb :_adb .Length },nil ;};func (filterIdentity )HandlerVersion ()(V ,R int ){return ;}; |