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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 (_ab "crypto/aes";_g "crypto/cipher";_bf "crypto/md5";_c "crypto/rand";_fa "crypto/rc4";_f "fmt";_aa "github.com/unidoc/unipdf/v3/common";_be "github.com/unidoc/unipdf/v3/core/security";_a "io";);func init (){_agb ("\u0041\u0045\u0053V\u0032",_ef )};
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type filterAES struct{};var _ Filter =filterAESV2 {};func (filterAES )EncryptBytes (buf []byte ,okey []byte )([]byte ,error ){_abe ,_efb :=_ab .NewCipher (okey );if _efb !=nil {return nil ,_efb ;};_aa .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 _ff =_ab .BlockSize ;_ag :=_ff -len (buf )%_ff ;for _bfd :=0;_bfd < _ag ;_bfd ++{buf =append (buf ,byte (_ag ));};_aa .Log .Trace ("\u0050a\u0064d\u0065\u0064\u0020\u0074\u006f \u0025\u0064 \u0062\u0079\u0074\u0065\u0073",len (buf ));_bb :=make ([]byte ,_ff +len (buf ));
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_bee :=_bb [:_ff ];if _ ,_ae :=_a .ReadFull (_c .Reader ,_bee );_ae !=nil {return nil ,_ae ;};_df :=_g .NewCBCEncrypter (_abe ,_bee );_df .CryptBlocks (_bb [_ff :],buf );buf =_bb ;_aa .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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// KeyLength implements Filter interface.
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func (_abg filterV2 )KeyLength ()int {return _abg ._cda };type filterV2 struct{_cda int };
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// Name implements Filter interface.
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func (filterAESV3 )Name ()string {return "\u0041\u0045\u0053V\u0033"};func (filterIdentity )EncryptBytes (p []byte ,okey []byte )([]byte ,error ){return p ,nil };
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// DecryptBytes implements Filter interface.
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func (filterV2 )DecryptBytes (buf []byte ,okey []byte )([]byte ,error ){_ce ,_gdff :=_fa .NewCipher (okey );if _gdff !=nil {return nil ,_gdff ;};_aa .Log .Trace ("\u0052\u00434\u0020\u0044\u0065c\u0072\u0079\u0070\u0074\u003a\u0020\u0025\u0020\u0078",buf );
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_ce .XORKeyStream (buf ,buf );_aa .Log .Trace ("\u0074o\u003a\u0020\u0025\u0020\u0078",buf );return buf ,nil ;};func _fg (_bgc string )(filterFunc ,error ){_bd :=_fcf [_bgc ];if _bd ==nil {return nil ,_f .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",_bgc );
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};return _bd ,nil ;};func init (){_agb ("\u0041\u0045\u0053V\u0033",_gg )};func (filterAES )DecryptBytes (buf []byte ,okey []byte )([]byte ,error ){_bbc ,_cf :=_ab .NewCipher (okey );if _cf !=nil {return nil ,_cf ;};if len (buf )< 16{_aa .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 ,_f .Errorf ("\u0041\u0045\u0053\u003a B\u0075\u0066\u0020\u006c\u0065\u006e\u0020\u003c\u0020\u0031\u0036\u0020\u0028\u0025d\u0029",len (buf ));};_bg :=buf [:16];buf =buf [16:];if len (buf )%16!=0{_aa .Log .Debug ("\u0020\u0069\u0076\u0020\u0028\u0025\u0064\u0029\u003a\u0020\u0025\u0020\u0078",len (_bg ),_bg );
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_aa .Log .Debug ("\u0062\u0075\u0066\u0020\u0028\u0025\u0064\u0029\u003a\u0020\u0025\u0020\u0078",len (buf ),buf );return buf ,_f .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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};_db :=_g .NewCBCDecrypter (_bbc ,_bg );_aa .Log .Trace ("A\u0045\u0053\u0020\u0044ec\u0072y\u0070\u0074\u0020\u0028\u0025d\u0029\u003a\u0020\u0025\u0020\u0078",len (buf ),buf );_aa .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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_db .CryptBlocks (buf ,buf );_aa .Log .Trace ("\u0074\u006f\u0020(\u0025\u0064\u0029\u003a\u0020\u0025\u0020\u0078",len (buf ),buf );if len (buf )==0{_aa .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 ;};_ca :=int (buf [len (buf )-1]);if _ca > len (buf ){_aa .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",_ca ,len (buf ));
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return buf ,_f .Errorf ("\u0069n\u0076a\u006c\u0069\u0064\u0020\u0070a\u0064\u0020l\u0065\u006e\u0067\u0074\u0068");};buf =buf [:len (buf )-_ca ];return buf ,nil ;};
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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 );};
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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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// KeyLength implements Filter interface.
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func (filterAESV2 )KeyLength ()int {return 128/8};type filterAESV3 struct{filterAES };
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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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// EncryptBytes implements Filter interface.
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func (filterV2 )EncryptBytes (buf []byte ,okey []byte )([]byte ,error ){_cce ,_ffe :=_fa .NewCipher (okey );if _ffe !=nil {return nil ,_ffe ;};_aa .Log .Trace ("\u0052\u00434\u0020\u0045\u006ec\u0072\u0079\u0070\u0074\u003a\u0020\u0025\u0020\u0078",buf );
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_cce .XORKeyStream (buf ,buf );_aa .Log .Trace ("\u0074o\u003a\u0020\u0025\u0020\u0078",buf );return buf ,nil ;};
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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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// NewFilterV2 creates a RC4-based filter with a specified key length (in bytes).
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func NewFilterV2 (length int )Filter {_eg ,_cd :=_cg (FilterDict {Length :length });if _cd !=nil {_aa .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",_cd );
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return filterV2 {_cda :length };};return _eg ;};type filterIdentity struct{};func (filterIdentity )KeyLength ()int {return 0};
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// NewFilterAESV2 creates an AES-based filter with a 128 bit key (AESV2).
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func NewFilterAESV2 ()Filter {_e ,_ad :=_ef (FilterDict {});if _ad !=nil {_aa .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",_ad );
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return filterAESV2 {};};return _e ;};func init (){_agb ("\u0056\u0032",_cg )};func _ef (_d FilterDict )(Filter ,error ){if _d .Length ==128{_aa .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",_d .Length );
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_d .Length /=8;};if _d .Length !=0&&_d .Length !=16{return nil ,_f .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",_d .Length );
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};return filterAESV2 {},nil ;};var _ Filter =filterV2 {};
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// NewFilterAESV3 creates an AES-based filter with a 256 bit key (AESV3).
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func NewFilterAESV3 ()Filter {_aba ,_ea :=_gg (FilterDict {});if _ea !=nil {_aa .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",_ea );
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return filterAESV3 {};};return _aba ;};
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// HandlerVersion implements Filter interface.
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func (_fab filterV2 )HandlerVersion ()(V ,R int ){V ,R =2,3;return ;};func (filterIdentity )MakeKey (objNum ,genNum uint32 ,fkey []byte )([]byte ,error ){return fkey ,nil };func (filterIdentity )PDFVersion ()[2]int {return [2]int {}};func _gg (_gd FilterDict )(Filter ,error ){if _gd .Length ==256{_aa .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",_gd .Length );
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_gd .Length /=8;};if _gd .Length !=0&&_gd .Length !=32{return nil ,_f .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",_gd .Length );
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};return filterAESV3 {},nil ;};
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// MakeKey implements Filter interface.
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func (_dc filterV2 )MakeKey (objNum ,genNum uint32 ,ekey []byte )([]byte ,error ){return _gb (objNum ,genNum ,ekey ,false );};
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// PDFVersion implements Filter interface.
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func (_bbe filterV2 )PDFVersion ()[2]int {return [2]int {}};
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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 (_aee ,_gbe uint32 ,_bcd []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 (_eae []byte ,_dbe []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 (_eaa []byte ,_gcd []byte )([]byte ,error );};func (filterIdentity )HandlerVersion ()(V ,R int ){return ;};
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// Name implements Filter interface.
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func (filterAESV2 )Name ()string {return "\u0041\u0045\u0053V\u0032"};type filterAESV2 struct{filterAES };
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// FilterDict represents information from a CryptFilter dictionary.
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type FilterDict struct{CFM string ;AuthEvent _be .AuthEvent ;Length int ;};
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// NewFilter creates CryptFilter from a corresponding dictionary.
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func NewFilter (d FilterDict )(Filter ,error ){_eag ,_cgg :=_fg (d .CFM );if _cgg !=nil {return nil ,_cgg ;};_de ,_cgg :=_eag (d );if _cgg !=nil {return nil ,_cgg ;};return _de ,nil ;};
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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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// Name implements Filter interface.
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func (filterV2 )Name ()string {return "\u0056\u0032"};var (_fcf =make (map[string ]filterFunc ););
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// KeyLength implements Filter interface.
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func (filterAESV3 )KeyLength ()int {return 256/8};
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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 (filterIdentity )DecryptBytes (p []byte ,okey []byte )([]byte ,error ){return p ,nil };func _agb (_bbce string ,_fabe filterFunc ){if _ ,_cb :=_fcf [_bbce ];_cb {panic ("\u0061l\u0072e\u0061\u0064\u0079\u0020\u0072e\u0067\u0069s\u0074\u0065\u0072\u0065\u0064");
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};_fcf [_bbce ]=_fabe ;};type filterFunc func (_bfb FilterDict )(Filter ,error );func _cg (_aeg FilterDict )(Filter ,error ){if _aeg .Length %8!=0{return nil ,_f .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",_aeg .Length );
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};if _aeg .Length < 5||_aeg .Length > 16{if _aeg .Length ==40||_aeg .Length ==64||_aeg .Length ==128{_aa .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",_aeg .Length );
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_aeg .Length /=8;}else {return nil ,_f .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",_aeg .Length );
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};};return filterV2 {_cda :_aeg .Length },nil ;};var _ Filter =filterAESV3 {};func _gb (_ffb ,_gbd uint32 ,_eac []byte ,_cgc bool )([]byte ,error ){_gc :=make ([]byte ,len (_eac )+5);copy (_gc ,_eac );for _abb :=0;_abb < 3;_abb ++{_ead :=byte ((_ffb >>uint32 (8*_abb ))&0xff);
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_gc [_abb +len (_eac )]=_ead ;};for _ga :=0;_ga < 2;_ga ++{_bc :=byte ((_gbd >>uint32 (8*_ga ))&0xff);_gc [_ga +len (_eac )+3]=_bc ;};if _cgc {_gc =append (_gc ,0x73);_gc =append (_gc ,0x41);_gc =append (_gc ,0x6C);_gc =append (_gc ,0x54);};_fb :=_bf .New ();
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_fb .Write (_gc );_cc :=_fb .Sum (nil );if len (_eac )+5< 16{return _cc [0:len (_eac )+5],nil ;};return _cc ,nil ;};
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// PDFVersion implements Filter interface.
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func (filterAESV3 )PDFVersion ()[2]int {return [2]int {2,0}};func (filterIdentity )Name ()string {return "\u0049\u0064\u0065\u006e\u0074\u0069\u0074\u0079"}; |