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134 lines
14 KiB
Go
134 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 (_d "crypto/aes";_f "crypto/cipher";_a "crypto/md5";_cg "crypto/rand";_df "crypto/rc4";_ef "fmt";_ag "github.com/unidoc/unipdf/v3/common";_aa "github.com/unidoc/unipdf/v3/core/security";_c "io";);func init (){_fca ("\u0041\u0045\u0053V\u0032",_ac )};
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// PDFVersion implements Filter interface.
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func (filterAESV3 )PDFVersion ()[2]int {return [2]int {2,0}};type filterV2 struct{_gbg int };
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// MakeKey implements Filter interface.
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func (filterAESV3 )MakeKey (_ ,_ uint32 ,ekey []byte )([]byte ,error ){return ekey ,nil };func (filterIdentity )PDFVersion ()[2]int {return [2]int {}};func (filterIdentity )EncryptBytes (p []byte ,okey []byte )([]byte ,error ){return p ,nil };
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// Name implements Filter interface.
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func (filterV2 )Name ()string {return "\u0056\u0032"};func (filterAES )EncryptBytes (buf []byte ,okey []byte )([]byte ,error ){_fe ,_be :=_d .NewCipher (okey );if _be !=nil {return nil ,_be ;};_ag .Log .Trace ("A\u0045\u0053\u0020\u0045nc\u0072y\u0070\u0074\u0020\u0028\u0025d\u0029\u003a\u0020\u0025\u0020\u0078",len (buf ),buf );
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const _dc =_d .BlockSize ;_ba :=_dc -len (buf )%_dc ;for _efg :=0;_efg < _ba ;_efg ++{buf =append (buf ,byte (_ba ));};_ag .Log .Trace ("\u0050a\u0064d\u0065\u0064\u0020\u0074\u006f \u0025\u0064 \u0062\u0079\u0074\u0065\u0073",len (buf ));_ea :=make ([]byte ,_dc +len (buf ));
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_bg :=_ea [:_dc ];if _ ,_gd :=_c .ReadFull (_cg .Reader ,_bg );_gd !=nil {return nil ,_gd ;};_fa :=_f .NewCBCEncrypter (_fe ,_bg );_fa .CryptBlocks (_ea [_dc :],buf );buf =_ea ;_ag .Log .Trace ("\u0074\u006f\u0020(\u0025\u0064\u0029\u003a\u0020\u0025\u0020\u0078",len (buf ),buf );
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return buf ,nil ;};
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// NewFilterAESV3 creates an AES-based filter with a 256 bit key (AESV3).
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func NewFilterAESV3 ()Filter {_ge ,_dfd :=_efd (FilterDict {});if _dfd !=nil {_ag .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",_dfd );
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return filterAESV3 {};};return _ge ;};func (filterIdentity )MakeKey (objNum ,genNum uint32 ,fkey []byte )([]byte ,error ){return fkey ,nil };func init (){_fca ("\u0041\u0045\u0053V\u0033",_efd )};
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// KeyLength implements Filter interface.
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func (_ec filterV2 )KeyLength ()int {return _ec ._gbg };
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// MakeKey implements Filter interface.
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func (filterAESV2 )MakeKey (objNum ,genNum uint32 ,ekey []byte )([]byte ,error ){return _gb (objNum ,genNum ,ekey ,true );};type filterAES struct{};
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// EncryptBytes implements Filter interface.
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func (filterV2 )EncryptBytes (buf []byte ,okey []byte )([]byte ,error ){_gg ,_gff :=_df .NewCipher (okey );if _gff !=nil {return nil ,_gff ;};_ag .Log .Trace ("\u0052\u00434\u0020\u0045\u006ec\u0072\u0079\u0070\u0074\u003a\u0020\u0025\u0020\u0078",buf );
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_gg .XORKeyStream (buf ,buf );_ag .Log .Trace ("\u0074o\u003a\u0020\u0025\u0020\u0078",buf );return buf ,nil ;};var _ Filter =filterV2 {};
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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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// NewFilterAESV2 creates an AES-based filter with a 128 bit key (AESV2).
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func NewFilterAESV2 ()Filter {_gf ,_ce :=_ac (FilterDict {});if _ce !=nil {_ag .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",_ce );
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return filterAESV2 {};};return _gf ;};var _ Filter =filterAESV2 {};
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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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// NewFilterV2 creates a RC4-based filter with a specified key length (in bytes).
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func NewFilterV2 (length int )Filter {_gef ,_cb :=_gee (FilterDict {Length :length });if _cb !=nil {_ag .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",_cb );
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return filterV2 {_gbg :length };};return _gef ;};var (_gcc =make (map[string ]filterFunc ););func (filterIdentity )Name ()string {return "\u0049\u0064\u0065\u006e\u0074\u0069\u0074\u0079"};func init (){_fca ("\u0056\u0032",_gee )};func _gee (_dd FilterDict )(Filter ,error ){if _dd .Length %8!=0{return nil ,_ef .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",_dd .Length );
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};if _dd .Length < 5||_dd .Length > 16{if _dd .Length ==40||_dd .Length ==64||_dd .Length ==128{_ag .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",_dd .Length );
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_dd .Length /=8;}else {return nil ,_ef .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",_dd .Length );
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};};return filterV2 {_gbg :_dd .Length },nil ;};func _bdac (_afe string )(filterFunc ,error ){_abb :=_gcc [_afe ];if _abb ==nil {return nil ,_ef .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",_afe );
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};return _abb ,nil ;};
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// KeyLength implements Filter interface.
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func (filterAESV3 )KeyLength ()int {return 256/8};
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// NewFilter creates CryptFilter from a corresponding dictionary.
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func NewFilter (d FilterDict )(Filter ,error ){_bgfc ,_agdc :=_bdac (d .CFM );if _agdc !=nil {return nil ,_agdc ;};_aae ,_agdc :=_bgfc (d );if _agdc !=nil {return nil ,_agdc ;};return _aae ,nil ;};
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// KeyLength implements Filter interface.
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func (filterAESV2 )KeyLength ()int {return 128/8};
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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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// HandlerVersion implements Filter interface.
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func (filterAESV3 )HandlerVersion ()(V ,R int ){V ,R =5,6;return ;};type filterFunc func (_fb FilterDict )(Filter ,error );
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// DecryptBytes implements Filter interface.
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func (filterV2 )DecryptBytes (buf []byte ,okey []byte )([]byte ,error ){_gbd ,_fc :=_df .NewCipher (okey );if _fc !=nil {return nil ,_fc ;};_ag .Log .Trace ("\u0052\u00434\u0020\u0044\u0065c\u0072\u0079\u0070\u0074\u003a\u0020\u0025\u0020\u0078",buf );
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_gbd .XORKeyStream (buf ,buf );_ag .Log .Trace ("\u0074o\u003a\u0020\u0025\u0020\u0078",buf );return buf ,nil ;};
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// HandlerVersion implements Filter interface.
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func (_da filterV2 )HandlerVersion ()(V ,R int ){V ,R =2,3;return ;};type filterIdentity struct{};func (filterIdentity )DecryptBytes (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 ;};func _fca (_eac string ,_bda filterFunc ){if _ ,_fg :=_gcc [_eac ];_fg {panic ("\u0061l\u0072e\u0061\u0064\u0079\u0020\u0072e\u0067\u0069s\u0074\u0065\u0072\u0065\u0064");};_gcc [_eac ]=_bda ;
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};type filterAESV3 struct{filterAES };
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// FilterDict represents information from a CryptFilter dictionary.
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type FilterDict struct{CFM string ;AuthEvent _aa .AuthEvent ;Length int ;};
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// PDFVersion implements Filter interface.
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func (_cgc filterV2 )PDFVersion ()[2]int {return [2]int {}};type filterAESV2 struct{filterAES };func (filterIdentity )KeyLength ()int {return 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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// MakeKey implements Filter interface.
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func (_dfe filterV2 )MakeKey (objNum ,genNum uint32 ,ekey []byte )([]byte ,error ){return _gb (objNum ,genNum ,ekey ,false );};func (filterIdentity )HandlerVersion ()(V ,R int ){return ;};func _efd (_b FilterDict )(Filter ,error ){if _b .Length ==256{_ag .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",_b .Length );
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_b .Length /=8;};if _b .Length !=0&&_b .Length !=32{return nil ,_ef .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",_b .Length );
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};return filterAESV3 {},nil ;};func (filterAES )DecryptBytes (buf []byte ,okey []byte )([]byte ,error ){_acf ,_cf :=_d .NewCipher (okey );if _cf !=nil {return nil ,_cf ;};if len (buf )< 16{_ag .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 );
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return buf ,_ef .Errorf ("\u0041\u0045\u0053\u003a B\u0075\u0066\u0020\u006c\u0065\u006e\u0020\u003c\u0020\u0031\u0036\u0020\u0028\u0025d\u0029",len (buf ));};_ee :=buf [:16];buf =buf [16:];if len (buf )%16!=0{_ag .Log .Debug ("\u0020\u0069\u0076\u0020\u0028\u0025\u0064\u0029\u003a\u0020\u0025\u0020\u0078",len (_ee ),_ee );
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_ag .Log .Debug ("\u0062\u0075\u0066\u0020\u0028\u0025\u0064\u0029\u003a\u0020\u0025\u0020\u0078",len (buf ),buf );return buf ,_ef .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 ));
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};_efgg :=_f .NewCBCDecrypter (_acf ,_ee );_ag .Log .Trace ("A\u0045\u0053\u0020\u0044ec\u0072y\u0070\u0074\u0020\u0028\u0025d\u0029\u003a\u0020\u0025\u0020\u0078",len (buf ),buf );_ag .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 );
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_efgg .CryptBlocks (buf ,buf );_ag .Log .Trace ("\u0074\u006f\u0020(\u0025\u0064\u0029\u003a\u0020\u0025\u0020\u0078",len (buf ),buf );if len (buf )==0{_ag .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");
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return buf ,nil ;};_ad :=int (buf [len (buf )-1]);if _ad > len (buf ){_ag .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",_ad ,len (buf ));
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return buf ,_ef .Errorf ("\u0069n\u0076a\u006c\u0069\u0064\u0020\u0070a\u0064\u0020l\u0065\u006e\u0067\u0074\u0068");};buf =buf [:len (buf )-_ad ];return buf ,nil ;};
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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 (_ff ,_bec uint32 ,_eec []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 (_cda []byte ,_gfb []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 (_agd []byte ,_adc []byte )([]byte ,error );};func _ac (_eg FilterDict )(Filter ,error ){if _eg .Length ==128{_ag .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",_eg .Length );
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_eg .Length /=8;};if _eg .Length !=0&&_eg .Length !=16{return nil ,_ef .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",_eg .Length );
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};return filterAESV2 {},nil ;};var _ Filter =filterAESV3 {};func _gb (_aag ,_gc uint32 ,_ab []byte ,_af bool )([]byte ,error ){_cge :=make ([]byte ,len (_ab )+5);for _cd :=0;_cd < len (_ab );_cd ++{_cge [_cd ]=_ab [_cd ];};for _faf :=0;_faf < 3;_faf ++{_fea :=byte ((_aag >>uint32 (8*_faf ))&0xff);
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_cge [_faf +len (_ab )]=_fea ;};for _aga :=0;_aga < 2;_aga ++{_bgb :=byte ((_gc >>uint32 (8*_aga ))&0xff);_cge [_aga +len (_ab )+3]=_bgb ;};if _af {_cge =append (_cge ,0x73);_cge =append (_cge ,0x41);_cge =append (_cge ,0x6C);_cge =append (_cge ,0x54);
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};_bdd :=_a .New ();_bdd .Write (_cge );_efa :=_bdd .Sum (nil );if len (_ab )+5< 16{return _efa [0:len (_ab )+5],nil ;};return _efa ,nil ;}; |