Ii#SrSSKJrJrJrJr SSKrSSKJrJ r J r SSK J r J r \RS:*rSrS rS rSS jrS rSS jrSrg)z Functions for parsing and dumping using the ASN.1 DER encoding. Exports the following items: - emit() - parse() - peek() Other type classes are defined that help compose the types listed above. )unicode_literalsdivisionabsolute_importprint_functionN)byte_clschr_cls type_name)int_from_bytes int_to_bytes)zOOPP zVaZENOO fc " ";i>OOPP zVaZ86ABB c3  89S>IJJ Qw@3FGG h ) )@9XCVVWW  6 AAc[U[5(d[S[U5-5e[ U5n[ X5up4U(aXB:wa[ SX$- -5eU$)a Parses a byte string of ASN.1 BER/DER-encoded data. This is typically not useful. Instead, use one of the standard classes from asn1crypto.core, or construct a new class with specific fields, and call the .load() class method. :param contents: A byte string of BER/DER-encoded data :param strict: A boolean indicating if trailing data should be forbidden - if so, a ValueError will be raised when trailing data exists :raises: ValueError - when the contents do not contain an ASN.1 header or are truncated in some way TypeError - when contents is not a byte string :return: A 6-element tuple: - 0: integer class (0 to 3) - 1: integer method - 2: integer tag - 3: byte string header - 4: byte string content - 5: byte string trailer rz4Extra data - %d bytes of trailing data were provided)rrrr len_parser)rstrict contents_leninfoconsumeds rparser$Ks^: h ) )@9XCVVWWx=LH3ND (*OS_Sjkll Krc[U[5(d[S[U5-5e[ U[ U55upU$)a' Parses a byte string of ASN.1 BER/DER-encoded data to find the length This is typically used to look into an encoded value to see how long the next chunk of ASN.1-encoded data is. Primarily it is useful when a value is a concatenation of multiple values. :param contents: A byte string of BER/DER-encoded data :raises: ValueError - when the contents do not contain an ASN.1 header or are truncated in some way TypeError - when contents is not a byte string :return: An integer with the number of bytes occupied by the ASN.1 value r)rrrr rr)rr"r#s rpeekr&rs>& h ) )@9XCVVWWHc(m4ND Orc 2U[:a [S5eUnXS-:a[[SX- 4-5e[(a [ X5OXnUS- nUS-nUS- S-nUS:XaSnXS-:a[[SX- 4-5e[(a [ X5OXn US- nU S:XaUS:Xa [S5eUS-nXyS -- nU S - S:XaOMnUS:a [S5eXS-:a[[SX- 4-5e[(a [ X5OXn US- nS n U S - S:XaX*S --n OU S -n U (a5XU -:a[[XU- 4-5eX-- nU[ XU - US S 9-n OVU(d [S5eUn XS-:d X U S-S:wa([ XU SUS-S9upXS-:aMX U S-S:waM(U S- n Sn X:a[[X- X- 4-5eU(aX,4$US- UUXUXU [U 5- U 4U 4$)a Parses a byte string into component parts :param encoded_data: A byte string that contains BER-encoded data :param data_len: The integer length of the encoded data :param pointer: The index in the byte string to parse from :param lengths_only: A boolean to cause the call to return a 2-element tuple of the integer number of bytes in the header and the integer number of bytes in the contents. Internal use only. :param depth: The recursion depth when evaluating indefinite-length encoding. :return: A 2-element tuple: - 0: A tuple of (class_, method, tag, header, content, trailer) - 1: An integer indicating how many bytes were consumed z*Indefinite-length recursion limit exceededrrTzNon-minimal tag encodingrF)signedz-Indefinite-length element must be constructeds) lengths_onlydepth) _MAX_DEPTHr_INSUFFICIENT_DATA_MESSAGE_PY2ordr rr) encoded_datadata_lenpointerr/r0start first_octetr constructednum length_octettrailer contents_end length_octets_s rrrs6 zEFF EA+3q(:L6MMNN04#l+,,:OK qLG  C!#q(K byA+% !;q(BT>U!UVV04#l+,,:OC qLGd{sax !;<< 3JC 9 Cax1} 878 8A+3q(:L6MMNN153|,-<;PL qLGGqA"45 %s* M11 !;}Y`N`>a!abb  $G"^L=AXY`4ajo%ppL !PQQ"LA--1Z^i1i"(\`hmnoho"pA--1Z^i1i A L!G3|7MxOa6bbcc&& 1    w ' c'l!: ;      rcpSnSnXPS--nXQS--nUS:aCSnUS:a)[XbS--5U-nU(dSnUS- nUS:aM)[US-5U-nOU[XR-5- n[U5nUS::aU[U5- nU$[U5nU[S[U5-5- nXH- nU$) a Constructs the header bytes for an ASN.1 object :param class_: An integer ASN.1 class value: 0 (universal), 1 (application), 2 (context), 3 (private) :param method: An integer ASN.1 method value: 0 (primitive), 1 (constructed) :param tag: An integer ASN.1 tag value :param contents: A byte string of the encoded byte contents :return: A byte string of the ASN.1 DER header rrr1r)r(r+r*r,)r rr ) rrrrheaderid_numcont_bitlength length_bytess rrrs*F F kF kF byAgXt45>F(C Ag "%.'&,'' ]F }'&/! M $F+ '$\!2233 Mr)F)rFr)__doc__ __future__rrrrsys_typesrr r utilr r version_infor4r3r2rr$r&rrrrrOsX SR 00. 4[  .Bb$N4gT.r