df68ddlmZddlmZddlmZmZmZmZddl m Z m Z m Z ddl mZmZgdZdZd ZGd d eZGd d Zedej,ej.ddZedej2ej4ddZedej8ej:ddZedej>ej@ddZ!edejDejFddZ$edejJejLddZ'ed ejPejRd!d"Z*ed#ejVejXd$d%Z-ed&ej\ej^d'd(Z0ed)ejbejdd*d+Z3ed,ejhejjd-d.Z6ed/ejnejpd0d1Z9ed2ejtejvd3d4Z<ed5ejzej|d6d7Z?ed8ejejd9d:ZBed;ejejdejejd?d@ZHedAejejdBZKedCejejdDZNe$e'e*e-e0e3e6e9etj|j j)} | j+| tj| S)aSerialise the curve parameters to binary string. :param str encoding: the format to save the curve parameters in. Default is ``named_curve``, with fallback being the ``explicit`` if the OID is not set for the curve. :param str point_encoding: the point encoding of the generator when explicit curve encoding is used. Ignored for ``named_curve`` format. :return: DER encoded ECParameters structure :rtype: bytes named_curveexplicitrRrSz5Only 'named_curve' and 'explicit' encodings supportedzJCan't encode curve using named_curve encoding without associated curve OIDz6Twisted Edwards curves don't support explicit encodingr)rB ValueErrorrrrCr<r9rr=r>encode_integerencode_sequencer%encode_octet_stringr abr:to_bytesr;cofactorappend) rEencodingpoint_encodingcurve_pversionfield_idr9baser; seq_elementsr\s r2to_derz Curve.to_derUs  xx(% 6 6G  } $88'+>>488, ,  M$;$; <z) )#H  **,,.$$Q'&& NNO ,c.@.@.I ##  # # '!97C   # # '!97C   &&t~~'>'>~'NO""4>>#7#7#9:5$> ::   ))$***=*=*?@H    )""L11r1cNtj|j||dS)a Serialise the curve parameters to the :term:`PEM` format. :param str encoding: the format to save the curve parameters in. Default is ``named_curve``, with fallback being the ``explicit`` if the OID is not set for the curve. :param str point_encoding: the point encoding of the generator when explicit curve encoding is used. Ignored for ``named_curve`` format. :return: PEM encoded ECParameters structure :rtype: str z EC PARAMETERS)rtopemre)rEr^r_s r2to_pemz Curve.to_pems%yy KK. 1?  r1cp|s td}td|Ds tdt|}t j |sSd|vrt j dt j|\}}|rt j dt|Sd|vrt j dt j|\}}|rt j d t j|\}}|d k7rt j d t j|\}}t j|\}}t j|\} }t j|\} }d } |rt j|\} } t j|\} }| tk(r td | tk7rtdj| t j|\}}|rt j dt j|\}}t j|\}}t!|}t!|}t#j$|||| }t"j&j)|| d| d}t+d||d }t,D] }||k(s |cS|S)aDecode the curve parameters from DER file. :param data: the binary string to decode the parameters from :type data: :term:`bytes-like object` :param valid_encodings: set of names of allowed encodings, by default all (set by passing ``None``), supported ones are ``named_curve`` and ``explicit`` :type valid_encodings: :term:`set-like object` rTc3$K|]}|dv yw)rTNr0).0is r2 z!Curve.from_der..sM133Msz1Only named_curve and explicit encodings supportedrRz(named_curve curve parameters not allowedzUnexpected data after OIDrSz%explicit curve parameters not allowedz,Unexpected data after ECParameters structurerz!Unknown parameter encoding formatNz#Characteristic 2 curves unsupportedzUnknown field type: {0}z:Unexpected data after ECParameters.fieldID.Prime-p element) uncompressed compressedhybridT)valid_encodingsr;r:unknown)setallrUr r is_sequence UnexpectedDER remove_objectrremove_sequenceremove_integerremove_octet_stringr&rr%formatr rCurveFp PointJacobi from_bytesrr)datarqrBemptyseqrarestrbr9 base_bytesr;r\_ field_typeprime curve_a_bytes curve_b_bytescurve_acurve_bcurve_fprc tmp_curverls r2from_derzCurve.from_ders!"=>OM_MMC t$t$O3''>**40JC''(CDDc? " _ ,##$KL L((. U ##> **3/  a<##$GH H,,T2$))$/ t2248 D((. t ,,T2KHa,,X6 D 5 5#$IJ J  (#)00< ))$/ u ##L  "55e< t!55d; t#=1"=1 (((K((33  D 4 )XtT:  AA~ r1cts t|tr|j}|j d}|dk(rt j d|jt j||d|S)amDecode the curve parameters from PEM file. :param str string: the text string to decode the parameters from :param valid_encodings: set of names of allowed encodings, by default all (set by passing ``None``), supported ones are ``named_curve`` and ``explicit`` :type valid_encodings: :term:`set-like object` s-----BEGIN EC PARAMETERS-----z"EC PARAMETERS PEM header not foundN) rr<strencodefindrrvrunpem)clsstringrqec_param_indexs r2from_pemzCurve.from_pemsjz&#.]]_F%EF R ##$HI I|| IIf^_- .  r1rH)Nrn) r-r.r/rFrLrNrPrerh staticmethodr classmethodrr0r1r2rr2sL4*!:2x $YYv  r1rr)rr secp112r1r)rrrrr5 secp112r2r)rrrr secp128r1r)rrrrr6 secp160r1r)rr)r*r+rrr prime192v1r)rrrr! secp224r1r)rr)r*r+rrr5 prime256v1r)rrrr" secp384r1r)rrrr# secp521r1r)rrrr secp256k1r) rr$rrr)r6rrrbrainpoolP160r1r) rrrrrr)r6rrrbrainpoolP192r1r ) rrrrrr)r6rrbrainpoolP224r1r!) rrrrrr)r6rrr5brainpoolP256r1r") rrrrrr)r6rr brainpoolP320r1r#) rrrrrr)r6rr brainpoolP384r1r$) rrrrrr)r6rr brainpoolP512r1r')rrepr()rrrqc tD]}|j|k(s|cStd|dtDcgc]}|jc}cc}w)a9Select a curve based on its OID :param tuple[int,...] oid_curve: ASN.1 Object Identifier of the curve to return, like ``(1, 2, 840, 10045, 3, 1, 7)`` for ``NIST256p``. :raises UnknownCurveError: When the oid doesn't match any of the supported curves :rtype: ~ecdsa.curves.Curve z&I don't know about the curve with oid z.I only know about these: )rrBrr7) oid_curvecs r2rrsP 55I H )2V4LQVV4L N 4LsA c tD]1}||jk(s|js||jk(s/|cStdj |tDcgc]}|jc}cc}w)a{Select a curve based on its name. Returns a :py:class:`~ecdsa.curves.Curve` object with a ``name`` name. Note that ``name`` is case-sensitve. :param str name: Name of the curve to return, like ``NIST256p`` or ``prime256v1`` :raises UnknownCurveError: When the name doesn't match any of the supported curves :rtype: ~ecdsa.curves.Curve z9Curve with name {0!r} unknown, only curves supported: {1})rr7r8rr{)r7rs r2rrsh 166>ann1GH CJJ 6*a166*  *sA2N)R __future__rsixrrrrr utilr r r _compatr r__all__r%r& Exceptionrr curve_112r1generator_112r1r curve_112r2generator_112r2r curve_128r1generator_128r1r curve_160r1generator_160r1r curve_192 generator_192r curve_224 generator_224r curve_256 generator_256r curve_384 generator_384r curve_521 generator_521rcurve_secp256k1generator_secp256k1rcurve_brainpoolp160r1generator_brainpoolp160r1rcurve_brainpoolp192r1generator_brainpoolp192r1rcurve_brainpoolp224r1generator_brainpoolp224r1r curve_brainpoolp256r1generator_brainpoolp256r1r!curve_brainpoolp320r1generator_brainpoolp320r1r"curve_brainpoolp384r1generator_brainpoolp384r1r#curve_brainpoolp512r1generator_brainpoolp512r1r$ curve_ed25519generator_ed25519r' curve_ed448generator_ed448r(rrrr0r1r2rsh..>>0  >+7  ` ` H                          OO     OO     OO     OO     OO           ###   ###   ###   ###   ###   ##$   ##$                         ' .(r1