(h USrSSKrSSKrSSKrSSKrSSKrSSKJr SSKJ r SSK J r SSK J r JrJrJr SSKJrJr SS KJr SS KJrJrJrJr SS KJr SS KJrJr SS K J!r!J"r" SSK#J$r$ Sr%\RP"\)5r*"SS5r+"SS5r,"SS\5r-"SS5r.S\\/\04S\/4Sjr1S\2S\24Sjr3g!\&a r'\'r%Sr'C'N`Sr'C'ff=f)a Utilities to perform encryption following the PDF standards. The contents of this module are internal to fpdf2, and not part of the public API. They may change at any time without prior warning or any deprecation period, in non-backward-compatible ways. N)hexlify) BOM_UTF16_BEurandom)CallableIterableTypeUnion)AccessPermissionEncryptionMethod) FPDFException)Name PDFObject PDFStringbuild_obj_dict)create_dictionary_string)Ciphermodes)AES128AES256)PKCS7cf\rSrSrSrSrS\S\4SjrS\S\ \ 4Sjr S\S \ \\ 4S\4S jrS rg ) ARC4&aZ This is a simplified version of the ARC4 (alleged RC4) algorithm, created based on the following sources: * Wikipedia article on RC4 * github.com/manojpandey/rc4 (MIT License) * http://people.csail.mit.edu/rivest/pubs/RS14.pdf Having this ARC4 implementation makes it possible to have basic encryption functions without additional dependencies keyreturnc[U5n[[UR55nSn[UR5H,nXCU-XU--UR-nX4X5sX5'X4'M. U$)Nr)lenlistrangeMOD)selfr key_lengthSjis KC:\Users\13-19\Desktop\PokeDex\pokedex\Lib\site-packages\fpdf/encryption.pyKSAARC4.KSA4snX txx ! txxAqTCJ//488;AqtJAD!$!r&c## SnSnUS-UR-nX1U-UR-nXXsX'X'XUX-UR-nUv MR7f)Nrr )r#)r$r&r(r'Ks r)PRGA ARC4.PRGA=sp  Q$(("AqTTXX%AqtJAD!$Q4!$;$((*+AG sAAtextcURURU55n/nUH nURU[U5- 5 M" U$N)r/r*appendnext)r$rr1 keystreamrescs r)encrypt ARC4.encryptGsAIIdhhsm, A JJq4 ?* + r,N)__name__ __module__ __qualname____firstlineno____doc__r#bytesr!r*rintr/r bytearrayr9__static_attributes__r;r,r)rr&s\  Cudx}5eY.>(?Dr,rcJ^\rSrSrSrS\S\SS4U4SjjrS\4SjrS r U=r $) CryptFilterOzMRepresents one crypt filter, listed under CF inside the encryption dictionarymodelengthrNc>[TU]5 [S5Ul[U5Ul[ US- 5Ulg)NrF)super__init__rtypec_f_mrBrI)r$rHrI __class__s r)rMCryptFilter.__init__Rs4 ' $Z &1*o r,c ~[[U5Vs0sHo[X5_M sn5n[U5$s snfr3)rdirgetattrpdf_dict)r$robj_dicts r) serializeCryptFilter.serializeXs8!c$i"Pis(:#:i"PQ!!#Qs:)rOrIrN) r<r=r>r?r@strrBrMrWrD __classcell__rPs@r)rFrFOs1W&S&#&$& "3""r,rFc0^\rSrSrSrSU4SjjrSrU=r$)EncryptionDictionary]z This class represents an encryption dictionary PDF 32000 reference - Table 20 The PDF trailer must reference this object (/Encrypt) c>[TU]5 [S5UlURUlUR UlSURR5S3UlSURR5S3Ul UR S:XaiSURR5S3Ul SURR5S3UlSURR5S3UlUR Ul[%UR&5UlUR*(dSUlUR,(a*[/SUR,R1505UlUR4[6R8:Xa![S5Ul[S5Ulg[S5Ul[S5Ulg) NStandard<>falsez/StdCFIdentityStdCF)rLrMrfilterr%rIrevisionroupperuoeo_eueu_epermsversionvint32access_permissionpencrypt_metadatacfrUrWc_fencryption_methodr NO_ENCRYPTIONstm_fstr_f)r$security_handlerrPs r)rMEncryptionDictionary.__init__ds :& &11 !**%''--/02%''--/02  $ $ )+..4467q9DH+..4467q9DH-3399;DJ!))'99:00$+D !   +;+>+>+H+H+J KLDH  - -1A1O1O Oj)DJj)DJgDJgDJr,)ryrwrgrIrjrnrvrqrir|r}rlrprs)r~StandardSecurityHandlerrN)r<r=r>r?r@rMrDrZr[s@r)r]r]]s ''r,r]c \rSrSrSrSrS\R"5\RS4S\ S\ \ S4S\S \S \ 4 S jjr S \ S S4SjrS \4SjrS\ \ \\4S\S \ \ \44SjrS\ S\S \ 4SjrS\S\S \4SjrS \ 4SjrS\S\4SjrS\S\S \4Sjr\S\SS\S \4Sj5r\S\SS\ S \4Sj5rS \ S \4S!jrS \ 4S"jrS \ 4S#jr \\"54S\SS$\S%\S&\S \4 S'jj5r!S-S(jr"S-S)jr#S-S*jr$S \4S+jr%S,r&g).r}z This class is referenced in the main PDF class and is used to handle all encryption functions * Calculate password and hashes * Provide encrypt method to be called by stream and strings * Set the access permissions on the document s (N^NuAdNV..h>/ dSizNFowner_password user_password permissionrzrwczXlUcSOSU-UlX lU(aUOSUlXPlSUlSUl[(a@UR[R[R4;a[S[35eUR[R:Xa9SUl SUl URS5 [SUR S9UlOUR[R:Xa@S Ul S Ul URS 5 S Ul[S UR S9UlOvUR[R :Xa9SUl SUl URS5 [SUR S9UlOSUl SUl URS5 X`lg)Nlpzucryptography module not available - Try: 'pip install cryptography' or use RC4 encryption method - Import error was: z1.6AESV2)rHrIrcz2.0rAESV3V2z1.5)fpdfrurrrzrxr% import_errorr AES_128AES_256EnvironmentErrorrrrh_set_min_pdf_versionrFr{rw)r$rrrrrzrws r)rM StandardSecurityHandler.__init__s ! /4zA  -.;]!2 .char_map/s5%%d++&&t,,Kr,r rc34># UH nT"U5v M g7fr3r;).0r8rs r) 9StandardSecurityHandler.prepare_string..=s!>v!(1++vNFKCc[R"U5=(d [R"U5=(d [R"U5=(d [R"U5=(d [R "U5=(dm [R "U5=(dP [R"U5=(d3 [R"U5=(d [R"U5$r3) rrin_table_c21_c22 in_table_c3 in_table_c4 in_table_c5 in_table_c6 in_table_c7 in_table_c8 in_table_c9rs r) is_prohibited=StandardSecurityHandler.prepare_string..is_prohibitedCs''- 0..t4 0))$/ 0))$/ 0))$/ 0 ))$/ 0 )) 0)) 0))$/ r,z The password z contains prohibited charactersrfunc.^[U4SjU55$)Nc34># UH nT"U5v M g7fr3r;)rrrs r)rPStandardSecurityHandler.prepare_string..has_character..\s4VTs4yyVr)any)rrs `r) has_character=StandardSecurityHandler.prepare_string..has_character[s4V44 4r,z+ contains invalid bidirectional characters.rNzUTF-8)rYr rAjoin unicodedata ucd_3_2_0 normalizeboolrrr in_table_d1 in_table_d2r)rrprepared_stringrrrrs @r)prepare_string&StandardSecurityHandler.prepare_string!sl 3 3  v;?7N''!>v!>>&//99&/R   "$DT""##F8+JK$ 5# 5H 5 5 **@*@ A A_j.D.DEE##F8+VW &&q'9::**?2+>??##F8+VW  # %-ds3O%%g..r,passwordc[U5S:aUSSn[URS55nURURSS[U5- 5 U$)z PDF32000 reference - Algorithm 2: Computing an encryption key Step (a) - Add the default padding at the end of provided password to make it 32 bit long rNlatin1)r rCrrDEFAULT_PADDING)r$rrvs r)padded_password'StandardSecurityHandler.padded_passwordssT x=2 }H hooh/ 0 %%oc!f67r,cURUR5n[S5Hn[U5nM US[R "UR S- 5nURUR5n[S5HDn/nUHnURXu- 5 M [5R[U5U5nMF [U5R5$)z PDF32000 reference - Algorithm 3: Computing the encryption dictionary's O (owner password) value The security handler is only using revision 3 or 4, so the legacy r2 version is not implemented here 3NrK) rrr"rmathceilr%rr4rr9rAr)r$m_rc4keyresultr(new_keyrs r)r/StandardSecurityHandler.generate_owner_password~s  !4!4 5rAAA5dii! 346%%d&8&89rAGqu%V^^E'NF;F  V}  ""r,c@^^[R"SSS9nUR[TR55 UR[ R TR55 [UR55mTRn[S5HDn/nUHnURXS- 5 M [5R[ U5T5mMF TRUU4Sj[S555 [ T5R5$)z PDF32000 reference - Algorithm 5: Computing the encryption dictionary's U (user password) value The security handler is only using revision 3 or 4, so the legacy r2 version is not implemented here rFrrc3N># UHnTUTRU- v M g7fr3)r)rxr r$s r)rAStandardSecurityHandler.generate_user_password..s( ;DaVAY--a0 09s"%r)rrrrCrrAfromhexrrrr"r4rr9rr)r$rrr(r!rr s` @r)r.StandardSecurityHandler.generate_user_passwords KKu 5 4//01 t||,-188:&ffrAGqu%V^^E'NF;F    ;@9  V}  ""r,input_passwordsaltuser_keyc[R"X-U-5R5nSnUS- nX-U-n[[ USS5[ R "USS55nUR5nURUS-5UR5-n [U SS5S-n U S:Xa%[R"U 5R5nOOU S:Xa%[R"U 5R5nO$[R"U 5R5nUS:a U SUS- ::aOGMUSS$) zb Algorithm 2B - section 7.6.4.3.4 of the ISO 32000-2:2020 Applied on Security handlers revision 6 rr Nrr@rr) rsha256rrrrrrrrsumsha384sha512) rr)r*r+r round_numberk1rre remainders r) compute_hash$StandardSecurityHandler.compute_hashs, NN>08; < C C E  A L#h.BF1Sb6NEIIa2h,?@F((*I  b)I,>,>,@@AAcrF aIA~NN1%,,.aNN1%,,.NN1%,,.r!ae|b/@&@'*"v r,cURUR5nU(d [5nURS5nURS5nUR XS9U-U-nUR 5UlUR XS9n[[U5[R"S55nUR5nURUR5UR5-nUR 5Ulg)z Generating the U (user password) and UE (user encryption) for security handlers of revision 6 Algorithm 8 - Section 7.6.4.4.7 of the ISO 32000-2:2020 rK)r)r*N)rrrCrr6rrlrrrrrrrrro) r$ruser_validation_salt user_key_saltrlrrrros r)r3StandardSecurityHandler.generate_user_password_rev6s ++D,>,>? %KM#44Q7--a0   ]  V" #  }Qs UYY|%<=$$&   dff % (:(:(< <&&(r,cURUR5nU(d[SUR35eURS5nURS5nUR UU[ R UR5S9U-U-nUR5Ul UR UU[ R UR5S9n[[U5[R"S55nUR5nURUR 5UR#5-nUR5Ulg)z Generating the O (owner password) and OE (owner encryption) for security handlers of revision 6 Algorithm 9 - Section 7.6.4.4.8 of the ISO 32000-2:2020 zInvalid owner password rK)r)r*r+r9N)rrrrr6rAr'rlrrjrrrrrrrrrm) r$rowner_validation_saltowner_key_saltrjrrrrms r)r4StandardSecurityHandler.generate_owner_password_rev6s, ,,T-@-@A"9$:M:M9N OP P $ 5 5a 8..q1   -*tvv.   $  $    )]]466*   s UYY|%<=$$&   dff % (:(:(< <&&(r,cSUR-nUR(aSOSnURSSSS9U-S-URS 5-n[ [ UR 5[R"55nUR5nURU5UR5-nUR5Ul g ) u 7.6.4.4.9 Algorithm 10: Computing the encryption dictionary’s Perms (permissions) value (Security handlers of revision 6) of the ISO 32000-2:2020 lTFrKrFrsadbrN)rurwrrrrrrECBrrrrrq)r$perms64brw perms_inputrrrqs r)r+StandardSecurityHandler.generate_perms_rev6s &(>(>>#'#8#84d   a8E  B  ##A& ' tvv 4$$&   - 0B0B0DDYY[ r,c[R"SSS9nURURUR55 UR[ R UR55 URURS-RSSSS95 UR[ R UR55 URSLa,URS:XaUR[ /SQ55 UR5S [R"UR S - 5n[#S 5H2n[%U5S [R"UR S - 5nM4 U$) z= PDF32000 reference Algorithm 2: Computing an encryption key rFrrrr)rJrJrJNrK2)rrrrrrAr'rjrurrrwrrrrrr%r"r)r$rr rs r)r/StandardSecurityHandler.generate_encryption_keys KKu 5 %%d&8&89: tvv&'   # #j 0 : :Xe ;  t||,-  E )dlla.? HHU34 5>tyy1)<=?rA[!CDIIdoo.A$BDF r,)rurxrwrzrrrrr%rjrmrrqrhrlrorrr)rN)'r<r=r>r?r@rr allr RC4rYr r rMrr]rrCrArBr9rrrrr classmethodr rrrrrr6rrrrrDr;r,r)rr}s. V+/'7';';'=.>.B.B!&5151S$Y' 51 % 51 , 5151n 3# 3$ 3*$8*  #y%/0  :=  sEz   FSF#F#F9U9C9E9  $ )%)),E5 d#<=SUO/D!:;O/SO/UO/O/b   ##"##( $+ ! + ,!!! !  !!F0B!&r,rrrcn[R"SSS9nURU5 UR5$)NrFr)rrrr)rrs r)rr)s) E51AHHTN 88:r,ncUS-nUS- S- $)z%convert long to signed 32 bit integerrIlr;)rQs r)rtrt/s JA Nj ((r,)4r@rloggingrrr binasciircodecsrosrtypingrrr r enumsr r errorsrsyntaxrrrrrrU&cryptography.hazmat.primitives.ciphersrr1cryptography.hazmat.primitives.ciphers.algorithmsrr&cryptography.hazmat.primitives.paddingrr ImportErrorerror getLoggerr<rrrFr]rrArCrrBrtr;r,r)ras 225!>>8DP<L   8 $&&R " "'9'@iiX eE9$%% )S)S)aLsCCCC