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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 (_a "crypto/aes";_c "crypto/cipher";_ed "crypto/md5";_ae "crypto/rand";_d "crypto/rc4";_ec "fmt";_cf "github.com/unidoc/unipdf/v3/common";_f "github.com/unidoc/unipdf/v3/core/security";_g "io";);func init (){_cga ("\u0041\u0045\u0053V\u0032",_bc )};
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func (filterAES )DecryptBytes (buf []byte ,okey []byte )([]byte ,error ){_fge ,_da :=_a .NewCipher (okey );if _da !=nil {return nil ,_da ;};if len (buf )< 16{_cf .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 ,_ec .Errorf ("\u0041\u0045\u0053\u003a B\u0075\u0066\u0020\u006c\u0065\u006e\u0020\u003c\u0020\u0031\u0036\u0020\u0028\u0025d\u0029",len (buf ));};_ef :=buf [:16];buf =buf [16:];if len (buf )%16!=0{_cf .Log .Debug ("\u0020\u0069\u0076\u0020\u0028\u0025\u0064\u0029\u003a\u0020\u0025\u0020\u0078",len (_ef ),_ef );
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_cf .Log .Debug ("\u0062\u0075\u0066\u0020\u0028\u0025\u0064\u0029\u003a\u0020\u0025\u0020\u0078",len (buf ),buf );return buf ,_ec .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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};_dg :=_c .NewCBCDecrypter (_fge ,_ef );_cf .Log .Trace ("A\u0045\u0053\u0020\u0044ec\u0072y\u0070\u0074\u0020\u0028\u0025d\u0029\u003a\u0020\u0025\u0020\u0078",len (buf ),buf );_cf .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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_dg .CryptBlocks (buf ,buf );_cf .Log .Trace ("\u0074\u006f\u0020(\u0025\u0064\u0029\u003a\u0020\u0025\u0020\u0078",len (buf ),buf );if len (buf )==0{_cf .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 ;};_ff :=int (buf [len (buf )-1]);if _ff > len (buf ){_cf .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",_ff ,len (buf ));
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return buf ,_ec .Errorf ("\u0069n\u0076a\u006c\u0069\u0064\u0020\u0070a\u0064\u0020l\u0065\u006e\u0067\u0074\u0068");};buf =buf [:len (buf )-_ff ];return buf ,nil ;};func (filterAES )EncryptBytes (buf []byte ,okey []byte )([]byte ,error ){_ggf ,_ddd :=_a .NewCipher (okey );
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if _ddd !=nil {return nil ,_ddd ;};_cf .Log .Trace ("A\u0045\u0053\u0020\u0045nc\u0072y\u0070\u0074\u0020\u0028\u0025d\u0029\u003a\u0020\u0025\u0020\u0078",len (buf ),buf );const _bgb =_a .BlockSize ;_ee :=_bgb -len (buf )%_bgb ;for _egd :=0;_egd < _ee ;
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_egd ++{buf =append (buf ,byte (_ee ));};_cf .Log .Trace ("\u0050a\u0064d\u0065\u0064\u0020\u0074\u006f \u0025\u0064 \u0062\u0079\u0074\u0065\u0073",len (buf ));_fg :=make ([]byte ,_bgb +len (buf ));_cd :=_fg [:_bgb ];if _ ,_aa :=_g .ReadFull (_ae .Reader ,_cd );
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_aa !=nil {return nil ,_aa ;};_adg :=_c .NewCBCEncrypter (_ggf ,_cd );_adg .CryptBlocks (_fg [_bgb :],buf );buf =_fg ;_cf .Log .Trace ("\u0074\u006f\u0020(\u0025\u0064\u0029\u003a\u0020\u0025\u0020\u0078",len (buf ),buf );return buf ,nil ;};func _cb (_aca FilterDict )(Filter ,error ){if _aca .Length %8!=0{return nil ,_ec .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",_aca .Length );
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};if _aca .Length < 5||_aca .Length > 16{if _aca .Length ==40||_aca .Length ==64||_aca .Length ==128{_cf .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",_aca .Length );
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_aca .Length /=8;}else {return nil ,_ec .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",_aca .Length );
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};};return filterV2 {_fa :_aca .Length },nil ;};func (filterIdentity )Name ()string {return "\u0049\u0064\u0065\u006e\u0074\u0069\u0074\u0079"};type filterIdentity struct{};type filterFunc func (_gca FilterDict )(Filter ,error );
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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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// 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 (_aed ,_ffb uint32 ,_bgba []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 (_ega []byte ,_cbd []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 (_cda []byte ,_fc []byte )([]byte ,error );};func _ad (_eg FilterDict )(Filter ,error ){if _eg .Length ==256{_cf .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",_eg .Length );
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_eg .Length /=8;};if _eg .Length !=0&&_eg .Length !=32{return nil ,_ec .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",_eg .Length );
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};return filterAESV3 {},nil ;};func init (){_cga ("\u0041\u0045\u0053V\u0033",_ad )};
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// Name implements Filter interface.
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func (filterV2 )Name ()string {return "\u0056\u0032"};
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// NewFilterAESV2 creates an AES-based filter with a 128 bit key (AESV2).
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func NewFilterAESV2 ()Filter {_b ,_cg :=_bc (FilterDict {});if _cg !=nil {_cf .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",_cg );
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return filterAESV2 {};};return _b ;};func _cga (_afc string ,_aec filterFunc ){if _ ,_ebc :=_eeb [_afc ];_ebc {panic ("\u0061l\u0072e\u0061\u0064\u0079\u0020\u0072e\u0067\u0069s\u0074\u0065\u0072\u0065\u0064");};_eeb [_afc ]=_aec ;};
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// MakeKey implements Filter interface.
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func (filterAESV2 )MakeKey (objNum ,genNum uint32 ,ekey []byte )([]byte ,error ){return _afg (objNum ,genNum ,ekey ,true );};type filterV2 struct{_fa int };type filterAESV3 struct{filterAES };
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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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// NewFilter creates CryptFilter from a corresponding dictionary.
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func NewFilter (d FilterDict )(Filter ,error ){_cdd ,_fdd :=_cge (d .CFM );if _fdd !=nil {return nil ,_fdd ;};_bfe ,_fdd :=_cdd (d );if _fdd !=nil {return nil ,_fdd ;};return _bfe ,nil ;};
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// KeyLength implements Filter interface.
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func (_bf filterV2 )KeyLength ()int {return _bf ._fa };var _ Filter =filterAESV2 {};func (filterIdentity )KeyLength ()int {return 0};
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// DecryptBytes implements Filter interface.
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func (filterV2 )DecryptBytes (buf []byte ,okey []byte )([]byte ,error ){_gf ,_dgd :=_d .NewCipher (okey );if _dgd !=nil {return nil ,_dgd ;};_cf .Log .Trace ("\u0052\u00434\u0020\u0044\u0065c\u0072\u0079\u0070\u0074\u003a\u0020\u0025\u0020\u0078",buf );
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_gf .XORKeyStream (buf ,buf );_cf .Log .Trace ("\u0074o\u003a\u0020\u0025\u0020\u0078",buf );return buf ,nil ;};func init (){_cga ("\u0056\u0032",_cb )};
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// FilterDict represents information from a CryptFilter dictionary.
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type FilterDict struct{CFM string ;AuthEvent _f .AuthEvent ;Length int ;};
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// KeyLength implements Filter interface.
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func (filterAESV3 )KeyLength ()int {return 256/8};
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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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// PDFVersion implements Filter interface.
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func (_edd filterV2 )PDFVersion ()[2]int {return [2]int {}};
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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 {_cab ,_fd :=_cb (FilterDict {Length :length });if _fd !=nil {_cf .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",_fd );
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return filterV2 {_fa :length };};return _cab ;};
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// HandlerVersion implements Filter interface.
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func (filterAESV2 )HandlerVersion ()(V ,R int ){V ,R =4,4;return ;};
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// PDFVersion implements Filter interface.
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func (filterAESV3 )PDFVersion ()[2]int {return [2]int {2,0}};type filterAESV2 struct{filterAES };var _ Filter =filterV2 {};func (filterIdentity )MakeKey (objNum ,genNum uint32 ,fkey []byte )([]byte ,error ){return fkey ,nil };
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// NewIdentity creates an identity filter that bypasses all data without changes.
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func NewIdentity ()Filter {return filterIdentity {}};func _cge (_fdaa string )(filterFunc ,error ){_de :=_eeb [_fdaa ];if _de ==nil {return nil ,_ec .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",_fdaa );
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};return _de ,nil ;};var (_eeb =make (map[string ]filterFunc ););type filterAES struct{};func _bc (_bg FilterDict )(Filter ,error ){if _bg .Length ==128{_cf .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",_bg .Length );
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_bg .Length /=8;};if _bg .Length !=0&&_bg .Length !=16{return nil ,_ec .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",_bg .Length );
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};return filterAESV2 {},nil ;};
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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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// NewFilterAESV3 creates an AES-based filter with a 256 bit key (AESV3).
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func NewFilterAESV3 ()Filter {_ddf ,_aeb :=_ad (FilterDict {});if _aeb !=nil {_cf .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",_aeb );
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return filterAESV3 {};};return _ddf ;};
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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 (_cgb filterV2 )MakeKey (objNum ,genNum uint32 ,ekey []byte )([]byte ,error ){return _afg (objNum ,genNum ,ekey ,false );};func (filterIdentity )PDFVersion ()[2]int {return [2]int {}};
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// EncryptBytes implements Filter interface.
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func (filterV2 )EncryptBytes (buf []byte ,okey []byte )([]byte ,error ){_bfb ,_eda :=_d .NewCipher (okey );if _eda !=nil {return nil ,_eda ;};_cf .Log .Trace ("\u0052\u00434\u0020\u0045\u006ec\u0072\u0079\u0070\u0074\u003a\u0020\u0025\u0020\u0078",buf );
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_bfb .XORKeyStream (buf ,buf );_cf .Log .Trace ("\u0074o\u003a\u0020\u0025\u0020\u0078",buf );return buf ,nil ;};func (filterIdentity )EncryptBytes (p []byte ,okey []byte )([]byte ,error ){return p ,nil };var _ Filter =filterAESV3 {};
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// KeyLength implements Filter interface.
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func (filterAESV2 )KeyLength ()int {return 128/8};
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// HandlerVersion implements Filter interface.
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func (_afa filterV2 )HandlerVersion ()(V ,R int ){V ,R =2,3;return ;};func _afg (_ddb ,_aaa uint32 ,_gb []byte ,_ge bool )([]byte ,error ){_ebf :=make ([]byte ,len (_gb )+5);copy (_ebf ,_gb );for _eeg :=0;_eeg < 3;_eeg ++{_efd :=byte ((_ddb >>uint32 (8*_eeg ))&0xff);
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_ebf [_eeg +len (_gb )]=_efd ;};for _df :=0;_df < 2;_df ++{_ag :=byte ((_aaa >>uint32 (8*_df ))&0xff);_ebf [_df +len (_gb )+3]=_ag ;};if _ge {_ebf =append (_ebf ,0x73);_ebf =append (_ebf ,0x41);_ebf =append (_ebf ,0x6C);_ebf =append (_ebf ,0x54);};_gc :=_ed .New ();
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_gc .Write (_ebf );_cdg :=_gc .Sum (nil );if len (_gb )+5< 16{return _cdg [0:len (_gb )+5],nil ;};return _cdg ,nil ;};func (filterIdentity )DecryptBytes (p []byte ,okey []byte )([]byte ,error ){return p ,nil };func (filterIdentity )HandlerVersion ()(V ,R int ){return ;
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}; |