mirror of
https://github.com/unidoc/unipdf.git
synced 2025-05-05 19:30:30 +08:00
137 lines
14 KiB
Go
137 lines
14 KiB
Go
//
|
|
// Copyright 2020 FoxyUtils ehf. All rights reserved.
|
|
//
|
|
// This is a commercial product and requires a license to operate.
|
|
// A trial license can be obtained at https://unidoc.io
|
|
//
|
|
// DO NOT EDIT: generated by unitwist Go source code obfuscator.
|
|
//
|
|
// Use of this source code is governed by the UniDoc End User License Agreement
|
|
// terms that can be accessed at https://unidoc.io/eula/
|
|
|
|
package crypt ;import (_f "crypto/aes";_de "crypto/cipher";_e "crypto/md5";_dg "crypto/rand";_c "crypto/rc4";_b "fmt";_ga "github.com/unidoc/unipdf/v3/common";_gag "github.com/unidoc/unipdf/v3/core/security";_g "io";);func init (){_aga ("\u0041\u0045\u0053V\u0032",_bf )};
|
|
func (filterIdentity )Name ()string {return "\u0049\u0064\u0065\u006e\u0074\u0069\u0074\u0079"};func (filterAES )EncryptBytes (buf []byte ,okey []byte )([]byte ,error ){_ge ,_ce :=_f .NewCipher (okey );if _ce !=nil {return nil ,_ce ;};_ga .Log .Trace ("A\u0045\u0053\u0020\u0045nc\u0072y\u0070\u0074\u0020\u0028\u0025d\u0029\u003a\u0020\u0025\u0020\u0078",len (buf ),buf );
|
|
const _be =_f .BlockSize ;_dca :=_be -len (buf )%_be ;for _gd :=0;_gd < _dca ;_gd ++{buf =append (buf ,byte (_dca ));};_ga .Log .Trace ("\u0050a\u0064d\u0065\u0064\u0020\u0074\u006f \u0025\u0064 \u0062\u0079\u0074\u0065\u0073",len (buf ));_eae :=make ([]byte ,_be +len (buf ));
|
|
_dgb :=_eae [:_be ];if _ ,_ceg :=_g .ReadFull (_dg .Reader ,_dgb );_ceg !=nil {return nil ,_ceg ;};_ead :=_de .NewCBCEncrypter (_ge ,_dgb );_ead .CryptBlocks (_eae [_be :],buf );buf =_eae ;_ga .Log .Trace ("\u0074\u006f\u0020(\u0025\u0064\u0029\u003a\u0020\u0025\u0020\u0078",len (buf ),buf );
|
|
return buf ,nil ;};func _dd (_feg FilterDict )(Filter ,error ){if _feg .Length %8!=0{return nil ,_b .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",_feg .Length );
|
|
};if _feg .Length < 5||_feg .Length > 16{if _feg .Length ==40||_feg .Length ==64||_feg .Length ==128{_ga .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",_feg .Length );
|
|
_feg .Length /=8;}else {return nil ,_b .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",_feg .Length );
|
|
};};return filterV2 {_dge :_feg .Length },nil ;};
|
|
|
|
// NewFilterV2 creates a RC4-based filter with a specified key length (in bytes).
|
|
func NewFilterV2 (length int )Filter {_egb ,_ed :=_dd (FilterDict {Length :length });if _ed !=nil {_ga .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",_ed );
|
|
return filterV2 {_dge :length };};return _egb ;};
|
|
|
|
// Name implements Filter interface.
|
|
func (filterAESV2 )Name ()string {return "\u0041\u0045\u0053V\u0032"};
|
|
|
|
// NewIdentity creates an identity filter that bypasses all data without changes.
|
|
func NewIdentity ()Filter {return filterIdentity {}};
|
|
|
|
// DecryptBytes implements Filter interface.
|
|
func (filterV2 )DecryptBytes (buf []byte ,okey []byte )([]byte ,error ){_fde ,_ffdd :=_c .NewCipher (okey );if _ffdd !=nil {return nil ,_ffdd ;};_ga .Log .Trace ("\u0052\u00434\u0020\u0044\u0065c\u0072\u0079\u0070\u0074\u003a\u0020\u0025\u0020\u0078",buf );
|
|
_fde .XORKeyStream (buf ,buf );_ga .Log .Trace ("\u0074o\u003a\u0020\u0025\u0020\u0078",buf );return buf ,nil ;};var _ Filter =filterAESV3 {};
|
|
|
|
// NewFilterAESV3 creates an AES-based filter with a 256 bit key (AESV3).
|
|
func NewFilterAESV3 ()Filter {_fa ,_eg :=_bff (FilterDict {});if _eg !=nil {_ga .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",_eg );
|
|
return filterAESV3 {};};return _fa ;};func init (){_aga ("\u0041\u0045\u0053V\u0033",_bff )};type filterAES struct{};
|
|
|
|
// Name implements Filter interface.
|
|
func (filterAESV3 )Name ()string {return "\u0041\u0045\u0053V\u0033"};
|
|
|
|
// HandlerVersion implements Filter interface.
|
|
func (filterAESV2 )HandlerVersion ()(V ,R int ){V ,R =4,4;return ;};
|
|
|
|
// KeyLength implements Filter interface.
|
|
func (filterAESV2 )KeyLength ()int {return 128/8};
|
|
|
|
// MakeKey implements Filter interface.
|
|
func (filterAESV3 )MakeKey (_ ,_ uint32 ,ekey []byte )([]byte ,error ){return ekey ,nil };
|
|
|
|
// MakeKey implements Filter interface.
|
|
func (filterAESV2 )MakeKey (objNum ,genNum uint32 ,ekey []byte )([]byte ,error ){return _ag (objNum ,genNum ,ekey ,true );};type filterAESV3 struct{filterAES };
|
|
|
|
// PDFVersion implements Filter interface.
|
|
func (_edd filterV2 )PDFVersion ()[2]int {return [2]int {}};func (filterIdentity )KeyLength ()int {return 0};
|
|
|
|
// FilterDict represents information from a CryptFilter dictionary.
|
|
type FilterDict struct{CFM string ;AuthEvent _gag .AuthEvent ;Length int ;};type filterFunc func (_da FilterDict )(Filter ,error );type filterAESV2 struct{filterAES };func init (){_aga ("\u0056\u0032",_dd )};func _ccc (_df string )(filterFunc ,error ){_gec :=_dgc [_df ];
|
|
if _gec ==nil {return nil ,_b .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",_df );};return _gec ,nil ;};func (filterAES )DecryptBytes (buf []byte ,okey []byte )([]byte ,error ){_gef ,_eaeb :=_f .NewCipher (okey );
|
|
if _eaeb !=nil {return nil ,_eaeb ;};if len (buf )< 16{_ga .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 ,_b .Errorf ("\u0041\u0045\u0053\u003a B\u0075\u0066\u0020\u006c\u0065\u006e\u0020\u003c\u0020\u0031\u0036\u0020\u0028\u0025d\u0029",len (buf ));
|
|
};_ff :=buf [:16];buf =buf [16:];if len (buf )%16!=0{_ga .Log .Debug ("\u0020\u0069\u0076\u0020\u0028\u0025\u0064\u0029\u003a\u0020\u0025\u0020\u0078",len (_ff ),_ff );_ga .Log .Debug ("\u0062\u0075\u0066\u0020\u0028\u0025\u0064\u0029\u003a\u0020\u0025\u0020\u0078",len (buf ),buf );
|
|
return buf ,_b .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 ));
|
|
};_fe :=_de .NewCBCDecrypter (_gef ,_ff );_ga .Log .Trace ("A\u0045\u0053\u0020\u0044ec\u0072y\u0070\u0074\u0020\u0028\u0025d\u0029\u003a\u0020\u0025\u0020\u0078",len (buf ),buf );_ga .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 );
|
|
_fe .CryptBlocks (buf ,buf );_ga .Log .Trace ("\u0074\u006f\u0020(\u0025\u0064\u0029\u003a\u0020\u0025\u0020\u0078",len (buf ),buf );if len (buf )==0{_ga .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 ;};_cb :=int (buf [len (buf )-1]);if _cb > len (buf ){_ga .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",_cb ,len (buf ));
|
|
return buf ,_b .Errorf ("\u0069n\u0076a\u006c\u0069\u0064\u0020\u0070a\u0064\u0020l\u0065\u006e\u0067\u0074\u0068");};buf =buf [:len (buf )-_cb ];return buf ,nil ;};var _ Filter =filterAESV2 {};func (filterIdentity )PDFVersion ()[2]int {return [2]int {}};
|
|
|
|
|
|
// KeyLength implements Filter interface.
|
|
func (_bfc filterV2 )KeyLength ()int {return _bfc ._dge };func (filterIdentity )HandlerVersion ()(V ,R int ){return ;};func (filterIdentity )MakeKey (objNum ,genNum uint32 ,fkey []byte )([]byte ,error ){return fkey ,nil };var (_dgc =make (map[string ]filterFunc );
|
|
);
|
|
|
|
// HandlerVersion implements Filter interface.
|
|
func (_ade filterV2 )HandlerVersion ()(V ,R int ){V ,R =2,3;return ;};
|
|
|
|
// MakeKey implements Filter interface.
|
|
func (_eda filterV2 )MakeKey (objNum ,genNum uint32 ,ekey []byte )([]byte ,error ){return _ag (objNum ,genNum ,ekey ,false );};
|
|
|
|
// PDFVersion implements Filter interface.
|
|
func (filterAESV3 )PDFVersion ()[2]int {return [2]int {2,0}};func (filterIdentity )DecryptBytes (p []byte ,okey []byte )([]byte ,error ){return p ,nil };
|
|
|
|
// Filter is a common interface for crypt filter methods.
|
|
type Filter interface{
|
|
|
|
// Name returns a name of the filter that should be used in CFM field of Encrypt dictionary.
|
|
Name ()string ;
|
|
|
|
// KeyLength returns a length of the encryption key in bytes.
|
|
KeyLength ()int ;
|
|
|
|
// PDFVersion reports the minimal version of PDF document that introduced this filter.
|
|
PDFVersion ()[2]int ;
|
|
|
|
// HandlerVersion reports V and R parameters that should be used for this filter.
|
|
HandlerVersion ()(V ,R int );
|
|
|
|
// MakeKey generates a object encryption key based on file encryption key and object numbers.
|
|
// Used only for legacy filters - AESV3 doesn't change the key for each object.
|
|
MakeKey (_aa ,_ced uint32 ,_ae []byte )([]byte ,error );
|
|
|
|
// EncryptBytes encrypts a buffer using object encryption key, as returned by MakeKey.
|
|
// Implementation may reuse a buffer and encrypt data in-place.
|
|
EncryptBytes (_dgg []byte ,_gcc []byte )([]byte ,error );
|
|
|
|
// DecryptBytes decrypts a buffer using object encryption key, as returned by MakeKey.
|
|
// Implementation may reuse a buffer and decrypt data in-place.
|
|
DecryptBytes (_ecf []byte ,_dggg []byte )([]byte ,error );};type filterIdentity struct{};func _bf (_ec FilterDict )(Filter ,error ){if _ec .Length ==128{_ga .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",_ec .Length );
|
|
_ec .Length /=8;};if _ec .Length !=0&&_ec .Length !=16{return nil ,_b .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",_ec .Length );
|
|
};return filterAESV2 {},nil ;};
|
|
|
|
// KeyLength implements Filter interface.
|
|
func (filterAESV3 )KeyLength ()int {return 256/8};var _ Filter =filterV2 {};
|
|
|
|
// NewFilterAESV2 creates an AES-based filter with a 128 bit key (AESV2).
|
|
func NewFilterAESV2 ()Filter {_ea ,_dc :=_bf (FilterDict {});if _dc !=nil {_ga .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",_dc );
|
|
return filterAESV2 {};};return _ea ;};func (filterIdentity )EncryptBytes (p []byte ,okey []byte )([]byte ,error ){return p ,nil };
|
|
|
|
// HandlerVersion implements Filter interface.
|
|
func (filterAESV3 )HandlerVersion ()(V ,R int ){V ,R =5,6;return ;};type filterV2 struct{_dge int };
|
|
|
|
// PDFVersion implements Filter interface.
|
|
func (filterAESV2 )PDFVersion ()[2]int {return [2]int {1,5}};
|
|
|
|
// Name implements Filter interface.
|
|
func (filterV2 )Name ()string {return "\u0056\u0032"};
|
|
|
|
// NewFilter creates CryptFilter from a corresponding dictionary.
|
|
func NewFilter (d FilterDict )(Filter ,error ){_edf ,_fdd :=_ccc (d .CFM );if _fdd !=nil {return nil ,_fdd ;};_aaa ,_fdd :=_edf (d );if _fdd !=nil {return nil ,_fdd ;};return _aaa ,nil ;};func _aga (_bb string ,_eac filterFunc ){if _ ,_agg :=_dgc [_bb ];
|
|
_agg {panic ("\u0061l\u0072e\u0061\u0064\u0079\u0020\u0072e\u0067\u0069s\u0074\u0065\u0072\u0065\u0064");};_dgc [_bb ]=_eac ;};
|
|
|
|
// EncryptBytes implements Filter interface.
|
|
func (filterV2 )EncryptBytes (buf []byte ,okey []byte )([]byte ,error ){_gdf ,_fdc :=_c .NewCipher (okey );if _fdc !=nil {return nil ,_fdc ;};_ga .Log .Trace ("\u0052\u00434\u0020\u0045\u006ec\u0072\u0079\u0070\u0074\u003a\u0020\u0025\u0020\u0078",buf );
|
|
_gdf .XORKeyStream (buf ,buf );_ga .Log .Trace ("\u0074o\u003a\u0020\u0025\u0020\u0078",buf );return buf ,nil ;};func _bff (_a FilterDict )(Filter ,error ){if _a .Length ==256{_ga .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",_a .Length );
|
|
_a .Length /=8;};if _a .Length !=0&&_a .Length !=32{return nil ,_b .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",_a .Length );
|
|
};return filterAESV3 {},nil ;};func _ag (_ffd ,_bc uint32 ,_fd []byte ,_cc bool )([]byte ,error ){_gc :=make ([]byte ,len (_fd )+5);for _ede :=0;_ede < len (_fd );_ede ++{_gc [_ede ]=_fd [_ede ];};for _agc :=0;_agc < 3;_agc ++{_ccg :=byte ((_ffd >>uint32 (8*_agc ))&0xff);
|
|
_gc [_agc +len (_fd )]=_ccg ;};for _ca :=0;_ca < 2;_ca ++{_ad :=byte ((_bc >>uint32 (8*_ca ))&0xff);_gc [_ca +len (_fd )+3]=_ad ;};if _cc {_gc =append (_gc ,0x73);_gc =append (_gc ,0x41);_gc =append (_gc ,0x6C);_gc =append (_gc ,0x54);};_fc :=_e .New ();
|
|
_fc .Write (_gc );_efa :=_fc .Sum (nil );if len (_fd )+5< 16{return _efa [0:len (_fd )+5],nil ;};return _efa ,nil ;}; |