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108 lines
14 KiB
Go
108 lines
14 KiB
Go
//
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// Copyright 2020 FoxyUtils ehf. All rights reserved.
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//
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// This is a commercial product and requires a license to operate.
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// A trial license can be obtained at https://unidoc.io
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//
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// DO NOT EDIT: generated by unitwist Go source code obfuscator.
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//
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// Use of this source code is governed by the UniDoc End User License Agreement
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// terms that can be accessed at https://unidoc.io/eula/
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package crypt ;import (_g "crypto/aes";_c "crypto/cipher";_ga "crypto/md5";_d "crypto/rand";_ef "crypto/rc4";_e "fmt";_db "github.com/unidoc/unipdf/v3/common";_bfc "github.com/unidoc/unipdf/v3/core/security";_bf "io";);func init (){_bge ("\u0041\u0045\u0053V\u0032",_da )};
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// FilterDict represents information from a CryptFilter dictionary.
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type FilterDict struct{CFM string ;AuthEvent _bfc .AuthEvent ;Length int ;};
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// DecryptBytes implements Filter interface.
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func (filterV2 )DecryptBytes (buf []byte ,okey []byte )([]byte ,error ){_fbc ,_cab :=_ef .NewCipher (okey );if _cab !=nil {return nil ,_cab ;};_db .Log .Trace ("\u0052\u00434\u0020\u0044\u0065c\u0072\u0079\u0070\u0074\u003a\u0020\u0025\u0020\u0078",buf );_fbc .XORKeyStream (buf ,buf );_db .Log .Trace ("\u0074o\u003a\u0020\u0025\u0020\u0078",buf );return buf ,nil ;};type filterV2 struct{_fef int };
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// KeyLength implements Filter interface.
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func (_cd filterV2 )KeyLength ()int {return _cd ._fef };func (filterAES )EncryptBytes (buf []byte ,okey []byte )([]byte ,error ){_fe ,_gad :=_g .NewCipher (okey );if _gad !=nil {return nil ,_gad ;};_db .Log .Trace ("A\u0045\u0053\u0020\u0045nc\u0072y\u0070\u0074\u0020\u0028\u0025d\u0029\u003a\u0020\u0025\u0020\u0078",len (buf ),buf );const _fc =_g .BlockSize ;_ae :=_fc -len (buf )%_fc ;for _ba :=0;_ba < _ae ;_ba ++{buf =append (buf ,byte (_ae ));};_db .Log .Trace ("\u0050a\u0064d\u0065\u0064\u0020\u0074\u006f \u0025\u0064 \u0062\u0079\u0074\u0065\u0073",len (buf ));_bad :=make ([]byte ,_fc +len (buf ));_cb :=_bad [:_fc ];if _ ,_gf :=_bf .ReadFull (_d .Reader ,_cb );_gf !=nil {return nil ,_gf ;};_deb :=_c .NewCBCEncrypter (_fe ,_cb );_deb .CryptBlocks (_bad [_fc :],buf );buf =_bad ;_db .Log .Trace ("\u0074\u006f\u0020(\u0025\u0064\u0029\u003a\u0020\u0025\u0020\u0078",len (buf ),buf );return buf ,nil ;};
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// Name implements Filter interface.
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func (filterAESV2 )Name ()string {return "\u0041\u0045\u0053V\u0032"};
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// MakeKey implements Filter interface.
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func (filterAESV3 )MakeKey (_ ,_ uint32 ,ekey []byte )([]byte ,error ){return ekey ,nil };
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// KeyLength implements Filter interface.
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func (filterAESV3 )KeyLength ()int {return 256/8};type filterAESV2 struct{filterAES };func init (){_bge ("\u0041\u0045\u0053V\u0033",_be )};
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// PDFVersion implements Filter interface.
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func (filterAESV3 )PDFVersion ()[2]int {return [2]int {2,0}};
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// NewIdentity creates an identity filter that bypasses all data without changes.
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func NewIdentity ()Filter {return filterIdentity {}};
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// KeyLength implements Filter interface.
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func (filterAESV2 )KeyLength ()int {return 128/8};func (filterAES )DecryptBytes (buf []byte ,okey []byte )([]byte ,error ){_fa ,_cfe :=_g .NewCipher (okey );if _cfe !=nil {return nil ,_cfe ;};if len (buf )< 16{_db .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 ));};_cfd :=buf [:16];buf =buf [16:];if len (buf )%16!=0{_db .Log .Debug ("\u0020\u0069\u0076\u0020\u0028\u0025\u0064\u0029\u003a\u0020\u0025\u0020\u0078",len (_cfd ),_cfd );_db .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 ));};_bb :=_c .NewCBCDecrypter (_fa ,_cfd );_db .Log .Trace ("A\u0045\u0053\u0020\u0044ec\u0072y\u0070\u0074\u0020\u0028\u0025d\u0029\u003a\u0020\u0025\u0020\u0078",len (buf ),buf );_db .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 );_bb .CryptBlocks (buf ,buf );_db .Log .Trace ("\u0074\u006f\u0020(\u0025\u0064\u0029\u003a\u0020\u0025\u0020\u0078",len (buf ),buf );if len (buf )==0{_db .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 ;};_gadd :=int (buf [len (buf )-1]);if _gadd > len (buf ){_db .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",_gadd ,len (buf ));return buf ,_e .Errorf ("\u0069n\u0076a\u006c\u0069\u0064\u0020\u0070a\u0064\u0020l\u0065\u006e\u0067\u0074\u0068");};buf =buf [:len (buf )-_gadd ];return buf ,nil ;};func (filterIdentity )Name ()string {return "\u0049\u0064\u0065\u006e\u0074\u0069\u0074\u0079"};
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// Name implements Filter interface.
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func (filterAESV3 )Name ()string {return "\u0041\u0045\u0053V\u0033"};
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// PDFVersion implements Filter interface.
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func (filterAESV2 )PDFVersion ()[2]int {return [2]int {1,5}};
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// PDFVersion implements Filter interface.
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func (_ge filterV2 )PDFVersion ()[2]int {return [2]int {}};func (filterIdentity )KeyLength ()int {return 0};func (filterIdentity )EncryptBytes (p []byte ,okey []byte )([]byte ,error ){return p ,nil };
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// HandlerVersion implements Filter interface.
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func (filterAESV2 )HandlerVersion ()(V ,R int ){V ,R =4,4;return ;};type filterAESV3 struct{filterAES };func init (){_bge ("\u0056\u0032",_cbc )};
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// HandlerVersion implements Filter interface.
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func (_cba filterV2 )HandlerVersion ()(V ,R int ){V ,R =2,3;return ;};var _ Filter =filterV2 {};
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// EncryptBytes implements Filter interface.
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func (filterV2 )EncryptBytes (buf []byte ,okey []byte )([]byte ,error ){_ece ,_eb :=_ef .NewCipher (okey );if _eb !=nil {return nil ,_eb ;};_db .Log .Trace ("\u0052\u00434\u0020\u0045\u006ec\u0072\u0079\u0070\u0074\u003a\u0020\u0025\u0020\u0078",buf );_ece .XORKeyStream (buf ,buf );_db .Log .Trace ("\u0074o\u003a\u0020\u0025\u0020\u0078",buf );return buf ,nil ;};func _fee (_badb ,_ce uint32 ,_ecb []byte ,_bea bool )([]byte ,error ){_gga :=make ([]byte ,len (_ecb )+5);for _fdd :=0;_fdd < len (_ecb );_fdd ++{_gga [_fdd ]=_ecb [_fdd ];};for _fad :=0;_fad < 3;_fad ++{_gff :=byte ((_badb >>uint32 (8*_fad ))&0xff);_gga [_fad +len (_ecb )]=_gff ;};for _ac :=0;_ac < 2;_ac ++{_bg :=byte ((_ce >>uint32 (8*_ac ))&0xff);_gga [_ac +len (_ecb )+3]=_bg ;};if _bea {_gga =append (_gga ,0x73);_gga =append (_gga ,0x41);_gga =append (_gga ,0x6C);_gga =append (_gga ,0x54);};_eca :=_ga .New ();_eca .Write (_gga );_ca :=_eca .Sum (nil );if len (_ecb )+5< 16{return _ca [0:len (_ecb )+5],nil ;};return _ca ,nil ;};func (filterIdentity )HandlerVersion ()(V ,R int ){return ;};
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// Filter is a common interface for crypt filter methods.
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type Filter interface{
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// Name returns a name of the filter that should be used in CFM field of Encrypt dictionary.
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Name ()string ;
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// KeyLength returns a length of the encryption key in bytes.
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KeyLength ()int ;
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// PDFVersion reports the minimal version of PDF document that introduced this filter.
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PDFVersion ()[2]int ;
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// HandlerVersion reports V and R parameters that should be used for this filter.
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HandlerVersion ()(V ,R int );
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// MakeKey generates a object encryption key based on file encryption key and object numbers.
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// Used only for legacy filters - AESV3 doesn't change the key for each object.
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MakeKey (_debe ,_dag uint32 ,_ecf []byte )([]byte ,error );
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// EncryptBytes encrypts a buffer using object encryption key, as returned by MakeKey.
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// Implementation may reuse a buffer and encrypt data in-place.
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EncryptBytes (_aa []byte ,_ea []byte )([]byte ,error );
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// DecryptBytes decrypts a buffer using object encryption key, as returned by MakeKey.
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// Implementation may reuse a buffer and decrypt data in-place.
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DecryptBytes (_fca []byte ,_fbg []byte )([]byte ,error );};
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// Name implements Filter interface.
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func (filterV2 )Name ()string {return "\u0056\u0032"};var _ Filter =filterAESV2 {};
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// NewFilterAESV2 creates an AES-based filter with a 128 bit key (AESV2).
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func NewFilterAESV2 ()Filter {_de ,_gg :=_da (FilterDict {});if _gg !=nil {_db .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",_gg );return filterAESV2 {};};return _de ;};func _fcb (_feda string )(filterFunc ,error ){_dff :=_cc [string (_feda )];if _dff ==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",_feda );};return _dff ,nil ;};
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// NewFilter creates CryptFilter from a corresponding dictionary.
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func NewFilter (d FilterDict )(Filter ,error ){_fcc ,_gfg :=_fcb (d .CFM );if _gfg !=nil {return nil ,_gfg ;};_fcg ,_gfg :=_fcc (d );if _gfg !=nil {return nil ,_gfg ;};return _fcg ,nil ;};
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// NewFilterAESV3 creates an AES-based filter with a 256 bit key (AESV3).
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func NewFilterAESV3 ()Filter {_ad ,_bc :=_be (FilterDict {});if _bc !=nil {_db .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",_bc );return filterAESV3 {};};return _ad ;};func (filterIdentity )DecryptBytes (p []byte ,okey []byte )([]byte ,error ){return p ,nil };func _da (_a FilterDict )(Filter ,error ){if _a .Length ==128{_db .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",_a .Length );_a .Length /=8;};if _a .Length !=0&&_a .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",_a .Length );};return filterAESV2 {},nil ;};func (filterIdentity )PDFVersion ()[2]int {return [2]int {}};var _ Filter =filterAESV3 {};func (filterIdentity )MakeKey (objNum ,genNum uint32 ,fkey []byte )([]byte ,error ){return fkey ,nil };type filterFunc func (_gc FilterDict )(Filter ,error );
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// NewFilterV2 creates a RC4-based filter with a specified key length (in bytes).
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func NewFilterV2 (length int )Filter {_bd ,_dc :=_cbc (FilterDict {Length :length });if _dc !=nil {_db .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",_dc );return filterV2 {_fef :length };};return _bd ;};
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// MakeKey implements Filter interface.
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func (filterAESV2 )MakeKey (objNum ,genNum uint32 ,ekey []byte )([]byte ,error ){return _fee (objNum ,genNum ,ekey ,true );};
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// HandlerVersion implements Filter interface.
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func (filterAESV3 )HandlerVersion ()(V ,R int ){V ,R =5,6;return ;};
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// MakeKey implements Filter interface.
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func (_fb filterV2 )MakeKey (objNum ,genNum uint32 ,ekey []byte )([]byte ,error ){return _fee (objNum ,genNum ,ekey ,false );};var (_cc =make (map[string ]filterFunc ););func _cbc (_bee FilterDict )(Filter ,error ){if _bee .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",_bee .Length );};if _bee .Length < 5||_bee .Length > 16{if _bee .Length ==40||_bee .Length ==64||_bee .Length ==128{_db .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",_bee .Length );_bee .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",_bee .Length );};};return filterV2 {_fef :_bee .Length },nil ;};type filterIdentity struct{};type filterAES struct{};func _bge (_gfd string ,_fed filterFunc ){if _ ,_dfa :=_cc [_gfd ];_dfa {panic ("\u0061l\u0072e\u0061\u0064\u0079\u0020\u0072e\u0067\u0069s\u0074\u0065\u0072\u0065\u0064");};_cc [_gfd ]=_fed ;};func _be (_cf FilterDict )(Filter ,error ){if _cf .Length ==256{_db .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",_cf .Length );_cf .Length /=8;};if _cf .Length !=0&&_cf .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",_cf .Length );};return filterAESV3 {},nil ;}; |