椭圆曲线加密算法（Elliptic Curve Cryptography, ECC）来生成一个密钥对，并进一步计算系统公钥

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上述代码的作用是使用椭圆曲线加密算法（Elliptic Curve Cryptography, ECC）来生成一个密钥对，并进一步计算系统公钥。具体来说，它包括以下步骤：定义哈希函数：代码定义了四个不同的哈希函数（H1、H2、H3、H4），这些函数使用SHA-256哈希算法，并对结果进行模运算以确保结果在特定范围内。选择椭圆曲线：使用SECP256k1椭圆曲线，这是一个常用的曲线，特别是在比特币等加密货币中使用。生成密钥对：使用ECDSA（Elliptic Curve Digital Signature Algorithm）生成一个私钥（kg_priv）和对应的公钥（kg_pub）。获取椭圆曲线参数：获取椭圆曲线的阶数p。随机选择主私钥η：在椭圆曲线的阶数范围内随机选择一个整数作为主私钥η。计算系统公钥Ppub：计算系统公钥Ppub，其值为η乘以公钥点P。

# module pyparsing.py## Copyright (c) 2003-2018 Paul T. McGuire## Permission is hereby granted, free of charge, to any person obtaining# a copy of this software and associated documentation files (the# "Software"), to deal in the Software without restriction, including# without limitation the rights to use, copy, modify, merge, publish,# distribute, sublicense, and/or sell copies of the Software, and to# permit persons to whom the Software is furnished to do so, subject to# the following conditions:## The above copyright notice and this permission notice shall be# included in all copies or substantial portions of the Software.## THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.#__doc__ = \"""pyparsing module - Classes and methods to define and execute parsing grammars=============================================================================The pyparsing module is an alternative approach to creating and executing simple grammars,vs. the traditional lex/yacc approach, or the use of regular expressions. With pyparsing, youdon't need to learn a new syntax for defining grammars or matching expressions - the parsing moduleprovides a library of classes that you use to construct the grammar directly in Python.Here is a program to parse "Hello, World!" (or any greeting of the form C{"<salutation>, <addressee>!"}), built up using L{Word}, L{Literal}, and L{And} elements (L{'+'<ParserElement.__add__>} operator gives L{And} expressions, strings are auto-converted toL{Literal} expressions):: from pyparsing import Word, alphas # define grammar of a greeting greet = Word(alphas) + "," + Word(alphas) + "!" hello = "Hello, World!" print (hello, "->", greet.parseString(hello))The program outputs the following:: Hello, World! -> ['Hello', ',', 'World', '!']The Python representation of the grammar is quite readable, owing to the self-explanatoryclass names, and the use of '+', '|' and '^' operators.The L{ParseResults} object returned from L{ParserElement.parseString<ParserElement.parseString>} can be accessed as a nested list, a dictionary, or anobject with named attributes.The pyparsing module handles some of the problems that are typically vexing when writing text parsers: - extra or missing whitespace (the above program will also handle "Hello,World!", "Hello , World !", etc.) - quoted strings - embedded commentsGetting Started ------------------Visit the classes L{ParserElement} and L{ParseResults} to see the base classes that most other pyparsingclasses inherit from. Use the docstrings for examples of how to: - construct literal match expressions from L{Literal} and L{CaselessLiteral} classes - construct character word-group expressions using the L{Word} class - see how to create repetitive expressions using L{ZeroOrMore} and L{OneOrMore} classes - use L{'+'<And>}, L{'|'<MatchFirst>}, L{'^'<Or>}, and L{'&'<Each>} operators to combine simple expressions into more complex ones - associate names with your parsed results using L{ParserElement.setResultsName} - find some helpful expression short-cuts like L{delimitedList} and L{oneOf} - find more useful common expressions in the L{pyparsing_common} namespace class"""__version__ = "2.2.1"__versionTime__ = "18 Sep 2018 00:49 UTC"__author__ = "Paul McGuire <ptmcg@users.sourceforge.net>"import stringfrom weakref import ref as wkrefimport copyimport sysimport warningsimport reimport sre_constantsimport collectionsimport pprintimport tracebackimport typesfrom datetime import datetimetry: from _thread import RLockexcept ImportError: from threading import RLocktry: # Python 3 from collections.abc import Iterable from collections.abc import MutableMappingexcept ImportError: # Python 2.7 from collections import Iterable from collections import MutableMappingtry: from collections import OrderedDict as _OrderedDictexcept ImportError: try: from ordereddict import OrderedDict as _OrderedDict except ImportError: _OrderedDict = None#~ sys.stderr.write( "testing pyparsing module, version %s, %s\n" % (__version__,__versionTime__ ) )__all__ = ['And', 'CaselessKeyword', 'CaselessLiteral', 'CharsNotIn', 'Combine', 'Dict', 'Each', 'Empty','FollowedBy', 'Forward', 'GoToColumn', 'Group', 'Keyword', 'LineEnd', 'LineStart', 'Literal','MatchFirst', 'NoMatch', 'NotAny', 'OneOrMore', 'OnlyOnce', 'Optional', 'Or','ParseBaseException', 'ParseElementEnhance', 'ParseException', 'ParseExpression', 'ParseFatalException','ParseResults', 'ParseSyntaxException', 'ParserElement', 'QuotedString', 'RecursiveGrammarException','Regex', 'SkipTo', 'StringEnd', 'StringStart', 'Suppress', 'Token', 'TokenConverter', 'White', 'Word', 'WordEnd', 'WordStart', 'ZeroOrMore','alphanums', 'alphas', 'alphas8bit', 'anyCloseTag', 'anyOpenTag', 'cStyleComment', 'col','commaSeparatedList', 'commonHTMLEntity', 'countedArray', 'cppStyleComment', 'dblQuotedString','dblSlashComment', 'delimitedList', 'dictOf', 'downcaseTokens', 'empty', 'hexnums','htmlComment', 'javaStyleComment', 'line', 'lineEnd', 'lineStart', 'lineno','makeHTMLTags', 'makeXMLTags', 'matchOnlyAtCol', 'matchPreviousExpr', 'matchPreviousLiteral','nestedExpr', 'nullDebugAction', 'nums', 'oneOf', 'opAssoc', 'operatorPrecedence', 'printables','punc8bit', 'pythonStyleComment', 'quotedString', 'removeQuotes', 'replaceHTMLEntity', 'replaceWith', 'restOfLine', 'sglQuotedString', 'srange', 'stringEnd','stringStart', 'traceParseAction', 'unicodeString', 'upcaseTokens', 'withAttribute','indentedBlock', 'originalTextFor', 'ungroup', 'infixNotation','locatedExpr', 'withClass','CloseMatch', 'tokenMap', 'pyparsing_common',]system_version = tuple(sys.version_info)[:3]PY_3 = system_version[0] == 3if PY_3: _MAX_INT = sys.maxsize basestring = str unichr = chr _ustr = str # build list of single arg builtins, that can be used as parse actions singleArgBuiltins = [sum, len, sorted, reversed, list, tuple, set, any, all, min, max]else: _MAX_INT = sys.maxint range = xrange def _ustr(obj): """Drop-in replacement for str(obj) that tries to be Unicode friendly. It first tries str(obj). If that fails with a UnicodeEncodeError, then it tries unicode(obj). It then < returns the unicode object | encodes it with the default encoding | ... >. """ if isinstance(obj,unicode): return obj try: # If this works, then _ustr(obj) has the same behaviour as str(obj), so # it won't break any existing code. return str(obj) except UnicodeEncodeError: # Else encode it ret = unicode(obj).encode(sys.getdefaultencoding(), 'xmlcharrefreplace') xmlcharref = Regex(r'&#\d+;') xmlcharref.setParseAction(lambda t: '\\u' + hex(int(t[0][2:-1]))[2:]) return xmlcharref.transformString(ret) # build list of single arg builtins, tolerant of Python version, that can be used as parse actions singleArgBuiltins = [] import __builtin__ for fname in "sum len sorted reversed list tuple set any all min max".split(): try: singleArgBuiltins.append(getattr(__builtin__,fname)) except AttributeError: continue _generat