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#
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# toyecc - A small Elliptic Curve Cryptography Demonstration.
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# Copyright (C) 2011-2022 Johannes Bauer
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#
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# This file is part of toyecc.
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#
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# toyecc is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; this program is ONLY licensed under
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# version 3 of the License, later versions are explicitly excluded.
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#
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# toyecc is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with toyecc; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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# Johannes Bauer <JohannesBauer@gmx.de>
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#
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try:
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from pyasn1.type import univ, namedtype, tag
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import pyasn1.codec.ber.decoder
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class ECPVer(univ.Integer):
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"""RFC 3279: Algorithms and Identifiers for the Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile
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ECPVer ::= INTEGER {ecpVer1(1)}
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"""
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pass
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class FieldElement(univ.OctetString):
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"""RFC 3279: Algorithms and Identifiers for the Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile
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FieldElement ::= OCTET STRING
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"""
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pass
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class ECPoint(univ.OctetString):
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"""RFC 3279: Algorithms and Identifiers for the Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile
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ECPoint ::= OCTET STRING
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"""
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pass
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class Curve(univ.Sequence):
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"""RFC 3279: Algorithms and Identifiers for the Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile
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Curve ::= SEQUENCE {
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a FieldElement,
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b FieldElement,
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seed BIT STRING OPTIONAL
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}
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"""
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componentType = namedtype.NamedTypes(
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namedtype.NamedType("a", FieldElement()),
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namedtype.NamedType("b", FieldElement()),
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namedtype.OptionalNamedType("seed", univ.BitString()),
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)
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class FieldID(univ.Sequence):
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"""RFC 3279: Algorithms and Identifiers for the Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile
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FieldID ::= SEQUENCE {
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fieldType OBJECT IDENTIFIER,
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parameters ANY DEFINED BY fieldType
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}
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"""
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componentType = namedtype.NamedTypes(
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namedtype.NamedType("fieldType", univ.ObjectIdentifier()),
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namedtype.NamedType("parameters", univ.Any()),
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)
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class SpecifiedECDomain(univ.Sequence):
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"""RFC 3279: Algorithms and Identifiers for the Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile
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ECParameters ::= SEQUENCE {
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version ECPVer, -- version is always 1
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fieldID FieldID, -- identifies the finite field over which the curve is defined
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curve Curve, -- coefficients a and b of the elliptic curve
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base ECPoint, -- specifies the base point P on the elliptic curve
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order INTEGER, -- the order n of the base point
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cofactor INTEGER OPTIONAL -- The integer h = #E(Fq)/n
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}
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"""
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componentType = namedtype.NamedTypes(
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namedtype.NamedType("version", ECPVer()),
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namedtype.NamedType("fieldID", FieldID()),
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namedtype.NamedType("curve", Curve()),
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namedtype.NamedType("base", ECPoint()),
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namedtype.NamedType("order", univ.Integer()),
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namedtype.OptionalNamedType("cofactor", univ.Integer()),
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)
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class ECParameters(univ.Choice):
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"""RFC 5480: Elliptic Curve Cryptography Subject Public Key Information
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ECParameters ::= CHOICE {
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namedCurve OBJECT IDENTIFIER
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implicitCurve NULL
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specifiedCurve SpecifiedECDomain
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}
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"""
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componentType = namedtype.NamedTypes(
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namedtype.NamedType("namedCurve", univ.ObjectIdentifier()),
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namedtype.NamedType("implicitCurve", univ.Null()),
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namedtype.NamedType("specifiedCurve", SpecifiedECDomain()),
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)
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class ECPrivateKey(univ.Sequence):
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"""RFC 5915: Elliptic Curve Private Key Structure
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ECPrivateKey ::= SEQUENCE {
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version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
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privateKey OCTET STRING,
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parameters [0] ECParameters {{ NamedCurve }} OPTIONAL,
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publicKey [1] BIT STRING OPTIONAL
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}
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"""
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componentType = namedtype.NamedTypes(
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namedtype.NamedType("version", univ.Integer()),
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namedtype.NamedType("privateKey", univ.OctetString()),
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namedtype.OptionalNamedType("parameters", ECParameters().subtype(implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 0))),
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namedtype.OptionalNamedType("publicKey", univ.BitString().subtype(implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 1))),
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)
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class AlgorithmIdentifier(univ.Sequence):
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"""RFC 5480: Elliptic Curve Cryptography Subject Public Key Information
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AlgorithmIdentifier ::= SEQUENCE {
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algorithm OBJECT IDENTIFIER,
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parameters ANY DEFINED BY algorithm OPTIONAL
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}
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"""
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componentType = namedtype.NamedTypes(
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namedtype.NamedType("algorithm", univ.ObjectIdentifier()),
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namedtype.NamedType("parameters", ECParameters()),
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)
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class ECPublicKey(univ.Sequence):
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"""RFC 5480: Elliptic Curve Cryptography Subject Public Key Information
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SubjectPublicKeyInfo ::= SEQUENCE {
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algorithm AlgorithmIdentifier,
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subjectPublicKey BIT STRING
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}
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"""
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componentType = namedtype.NamedTypes(
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namedtype.NamedType("algorithm", AlgorithmIdentifier()),
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namedtype.NamedType("subjectPublicKey", univ.BitString()),
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)
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class FieldFPParameters(univ.Integer):
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"""For F_P fields, the field parameters is just the integer P."""
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pass
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__have_asn1 = True
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except ImportError:
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__have_asn1 = False
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def have_asn1_support():
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return __have_asn1
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def __assert_asn1_support():
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if not have_asn1_support():
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raise Exception("ASN.1 support is required, but the pyasn1 library could not be imported. Functionality not available.")
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def parse_asn1_field_params_fp(derdata):
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"""Parse an ASN.1 DER encoded field parameter for fields in F_P."""
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__assert_asn1_support()
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(parsed, tail) = pyasn1.codec.ber.decoder.decode(derdata, asn1Spec = FieldFPParameters())
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return parsed
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def parse_asn1_public_key(derdata):
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"""Parse an ASN.1 DER encoded EC public key."""
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__assert_asn1_support()
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(parsed, tail) = pyasn1.codec.ber.decoder.decode(derdata, asn1Spec = ECPublicKey())
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return parsed
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def parse_asn1_private_key(derdata):
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"""Parse an ASN.1 DER encoded EC private key."""
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__assert_asn1_support()
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(parsed, tail) = pyasn1.codec.ber.decoder.decode(derdata, asn1Spec = ECPrivateKey())
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return parsed
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