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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 (_gd "crypto/aes";_b "crypto/cipher";_f "crypto/md5";_ac "crypto/rand";_e "crypto/rc4";_gc "fmt";_fb "github.com/unidoc/unipdf/v3/common";_ed "github.com/unidoc/unipdf/v3/core/security";_a "io";);func init (){_dce ("\u0041\u0045\u0053V\u0032",_c )};
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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 {_fg ,_bfa :=_fec (FilterDict {Length :length });if _bfa !=nil {_fb .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",_bfa );return filterV2 {_bb :length };};return _fg ;};
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// KeyLength implements Filter interface.
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func (filterAESV2 )KeyLength ()int {return 128/8};
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// NewIdentity creates an identity filter that bypasses all data without changes.
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func NewIdentity ()Filter {return filterIdentity {}};
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// HandlerVersion implements Filter interface.
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func (_ead filterV2 )HandlerVersion ()(V ,R int ){V ,R =2,3;return ;};
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// NewFilterAESV3 creates an AES-based filter with a 256 bit key (AESV3).
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func NewFilterAESV3 ()Filter {_ad ,_d :=_ec (FilterDict {});if _d !=nil {_fb .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",_d );return filterAESV3 {};};return _ad ;};
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// NewFilter creates CryptFilter from a corresponding dictionary.
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func NewFilter (d FilterDict )(Filter ,error ){_cfg ,_acd :=_fff (d .CFM );if _acd !=nil {return nil ,_acd ;};_dcg ,_acd :=_cfg (d );if _acd !=nil {return nil ,_acd ;};return _dcg ,nil ;};type filterAESV2 struct{filterAES };func (filterIdentity )KeyLength ()int {return 0};
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// KeyLength implements Filter interface.
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func (_gdc filterV2 )KeyLength ()int {return _gdc ._bb };func init (){_dce ("\u0041\u0045\u0053V\u0033",_ec )};func (filterIdentity )HandlerVersion ()(V ,R int ){return ;};
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// NewFilterAESV2 creates an AES-based filter with a 128 bit key (AESV2).
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func NewFilterAESV2 ()Filter {_gcb ,_gdf :=_c (FilterDict {});if _gdf !=nil {_fb .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",_gdf );return filterAESV2 {};};return _gcb ;};func _fff (_ca string )(filterFunc ,error ){_bg :=_ada [string (_ca )];if _bg ==nil {return nil ,_gc .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",_ca );};return _bg ,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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// PDFVersion implements Filter interface.
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func (_gaf filterV2 )PDFVersion ()[2]int {return [2]int {}};
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// HandlerVersion implements Filter interface.
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func (filterAESV2 )HandlerVersion ()(V ,R int ){V ,R =4,4;return ;};type filterFunc func (_cee FilterDict )(Filter ,error );type filterAESV3 struct{filterAES };
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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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// DecryptBytes implements Filter interface.
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func (filterV2 )DecryptBytes (buf []byte ,okey []byte )([]byte ,error ){_dda ,_bdfa :=_e .NewCipher (okey );if _bdfa !=nil {return nil ,_bdfa ;};_fb .Log .Trace ("\u0052\u00434\u0020\u0044\u0065c\u0072\u0079\u0070\u0074\u003a\u0020\u0025\u0020\u0078",buf );_dda .XORKeyStream (buf ,buf );_fb .Log .Trace ("\u0074o\u003a\u0020\u0025\u0020\u0078",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"};func _fec (_eac FilterDict )(Filter ,error ){if _eac .Length %8!=0{return nil ,_gc .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",_eac .Length );};if _eac .Length < 5||_eac .Length > 16{if _eac .Length ==40||_eac .Length ==64||_eac .Length ==128{_fb .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",_eac .Length );_eac .Length /=8;}else {return nil ,_gc .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",_eac .Length );};};return filterV2 {_bb :_eac .Length },nil ;};func init (){_dce ("\u0056\u0032",_fec )};
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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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// EncryptBytes implements Filter interface.
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func (filterV2 )EncryptBytes (buf []byte ,okey []byte )([]byte ,error ){_ddf ,_gcg :=_e .NewCipher (okey );if _gcg !=nil {return nil ,_gcg ;};_fb .Log .Trace ("\u0052\u00434\u0020\u0045\u006ec\u0072\u0079\u0070\u0074\u003a\u0020\u0025\u0020\u0078",buf );_ddf .XORKeyStream (buf ,buf );_fb .Log .Trace ("\u0074o\u003a\u0020\u0025\u0020\u0078",buf );return buf ,nil ;};func (filterIdentity )PDFVersion ()[2]int {return [2]int {}};
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// FilterDict represents information from a CryptFilter dictionary.
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type FilterDict struct{CFM string ;AuthEvent _ed .AuthEvent ;Length int ;};type filterAES struct{};
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// PDFVersion implements Filter interface.
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func (filterAESV3 )PDFVersion ()[2]int {return [2]int {2,0}};var _ Filter =filterV2 {};
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// Name implements Filter interface.
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func (filterV2 )Name ()string {return "\u0056\u0032"};
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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 (_efc ,_be uint32 ,_ae []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 (_aee []byte ,_ba []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 ,_bae []byte )([]byte ,error );};type filterV2 struct{_bb int };func (filterAES )DecryptBytes (buf []byte ,okey []byte )([]byte ,error ){_eb ,_ea :=_gd .NewCipher (okey );if _ea !=nil {return nil ,_ea ;};if len (buf )< 16{_fb .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 ,_gc .Errorf ("\u0041\u0045\u0053\u003a B\u0075\u0066\u0020\u006c\u0065\u006e\u0020\u003c\u0020\u0031\u0036\u0020\u0028\u0025d\u0029",len (buf ));};_dac :=buf [:16];buf =buf [16:];if len (buf )%16!=0{_fb .Log .Debug ("\u0020\u0069\u0076\u0020\u0028\u0025\u0064\u0029\u003a\u0020\u0025\u0020\u0078",len (_dac ),_dac );_fb .Log .Debug ("\u0062\u0075\u0066\u0020\u0028\u0025\u0064\u0029\u003a\u0020\u0025\u0020\u0078",len (buf ),buf );return buf ,_gc .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 ));};_fc :=_b .NewCBCDecrypter (_eb ,_dac );_fb .Log .Trace ("A\u0045\u0053\u0020\u0044ec\u0072y\u0070\u0074\u0020\u0028\u0025d\u0029\u003a\u0020\u0025\u0020\u0078",len (buf ),buf );_fb .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 );_fc .CryptBlocks (buf ,buf );_fb .Log .Trace ("\u0074\u006f\u0020(\u0025\u0064\u0029\u003a\u0020\u0025\u0020\u0078",len (buf ),buf );if len (buf )==0{_fb .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 ;};_bd :=int (buf [len (buf )-1]);if _bd > len (buf ){_fb .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",_bd ,len (buf ));return buf ,_gc .Errorf ("\u0069n\u0076a\u006c\u0069\u0064\u0020\u0070a\u0064\u0020l\u0065\u006e\u0067\u0074\u0068");};buf =buf [:len (buf )-_bd ];return buf ,nil ;};type filterIdentity struct{};func (filterIdentity )Name ()string {return "\u0049\u0064\u0065\u006e\u0074\u0069\u0074\u0079"};var _ Filter =filterAESV2 {};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 (filterAESV3 )Name ()string {return "\u0041\u0045\u0053V\u0033"};var _ Filter =filterAESV3 {};
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// MakeKey implements Filter interface.
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func (filterAESV2 )MakeKey (objNum ,genNum uint32 ,ekey []byte )([]byte ,error ){return _ceg (objNum ,genNum ,ekey ,true );};func (filterIdentity )MakeKey (objNum ,genNum uint32 ,fkey []byte )([]byte ,error ){return fkey ,nil };
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// MakeKey implements Filter interface.
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func (_faa filterV2 )MakeKey (objNum ,genNum uint32 ,ekey []byte )([]byte ,error ){return _ceg (objNum ,genNum ,ekey ,false );};func _c (_bc FilterDict )(Filter ,error ){if _bc .Length ==128{_fb .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",_bc .Length );_bc .Length /=8;};if _bc .Length !=0&&_bc .Length !=16{return nil ,_gc .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",_bc .Length );};return filterAESV2 {},nil ;};var (_ada =make (map[string ]filterFunc ););
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// KeyLength implements Filter interface.
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func (filterAESV3 )KeyLength ()int {return 256/8};func (filterIdentity )DecryptBytes (p []byte ,okey []byte )([]byte ,error ){return p ,nil };func _ceg (_cef ,_dc uint32 ,_fgb []byte ,_fcc bool )([]byte ,error ){_ee :=make ([]byte ,len (_fgb )+5);for _bcf :=0;_bcf < len (_fgb );_bcf ++{_ee [_bcf ]=_fgb [_bcf ];};for _ef :=0;_ef < 3;_ef ++{_gg :=byte ((_cef >>uint32 (8*_ef ))&0xff);_ee [_ef +len (_fgb )]=_gg ;};for _bdf :=0;_bdf < 2;_bdf ++{_fcd :=byte ((_dc >>uint32 (8*_bdf ))&0xff);_ee [_bdf +len (_fgb )+3]=_fcd ;};if _fcc {_ee =append (_ee ,0x73);_ee =append (_ee ,0x41);_ee =append (_ee ,0x6C);_ee =append (_ee ,0x54);};_eab :=_f .New ();_eab .Write (_ee );_efe :=_eab .Sum (nil );if len (_fgb )+5< 16{return _efe [0:len (_fgb )+5],nil ;};return _efe ,nil ;};func (filterAES )EncryptBytes (buf []byte ,okey []byte )([]byte ,error ){_gce ,_bf :=_gd .NewCipher (okey );if _bf !=nil {return nil ,_bf ;};_fb .Log .Trace ("A\u0045\u0053\u0020\u0045nc\u0072y\u0070\u0074\u0020\u0028\u0025d\u0029\u003a\u0020\u0025\u0020\u0078",len (buf ),buf );const _cf =_gd .BlockSize ;_fe :=_cf -len (buf )%_cf ;for _ff :=0;_ff < _fe ;_ff ++{buf =append (buf ,byte (_fe ));};_fb .Log .Trace ("\u0050a\u0064d\u0065\u0064\u0020\u0074\u006f \u0025\u0064 \u0062\u0079\u0074\u0065\u0073",len (buf ));_edd :=make ([]byte ,_cf +len (buf ));_ccd :=_edd [:_cf ];if _ ,_fef :=_a .ReadFull (_ac .Reader ,_ccd );_fef !=nil {return nil ,_fef ;};_da :=_b .NewCBCEncrypter (_gce ,_ccd );_da .CryptBlocks (_edd [_cf :],buf );buf =_edd ;_fb .Log .Trace ("\u0074\u006f\u0020(\u0025\u0064\u0029\u003a\u0020\u0025\u0020\u0078",len (buf ),buf );return buf ,nil ;};func _ec (_cc FilterDict )(Filter ,error ){if _cc .Length ==256{_fb .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",_cc .Length );_cc .Length /=8;};if _cc .Length !=0&&_cc .Length !=32{return nil ,_gc .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",_cc .Length );};return filterAESV3 {},nil ;};func _dce (_ag string ,_cfa filterFunc ){if _ ,_dae :=_ada [_ag ];_dae {panic ("\u0061l\u0072e\u0061\u0064\u0079\u0020\u0072e\u0067\u0069s\u0074\u0065\u0072\u0065\u0064");};_ada [_ag ]=_cfa ;}; |