cryptoPP ECIES验证

作者: right_33cb | 来源:发表于2018-10-19 10:32 被阅读0次

#include <iostream>

#include "eccrypto.h"

#include "osrng.h"

#include "oids.h"

#include "hex.h"

#include "filters.h"

#ifndef ECC_ENCRYPTION_ALGORITHM_H_

#define ECC_ENCRYPTION_ALGORITHM_H_

#include<string>

class EccEncryption

{

public:

/// This method is used to generate keys for ECC encryption algorithm

///

/// \param[in] uiKeySize, length of key

/// \param[out] sPrivateKey, private key

/// \param[out] sPublicKey, public key

void GenerateEccKeys(unsigned int uiKeySize, std::string& sPrivateKey, std::string& sPublicKey);

/// This method is used to encrypt the input message using public key

///

/// \param[in] sPublicKey, public key generated by the first method

/// \param[out] sMsgToEncrypt, message to encryppt

/// \return the message encrypted using the input public key

std::string Encrypt(const std::string& sPublicKey, const std::string& sMsgToEncrypt);

/// This method is used to decrypt the input message using private key

///

/// \param[in] sPrivateKey, private key used to decrypt the cipher text

/// \param[in] sMsgToDecrypt, cipher text used to decrypt to get the plain text

/// \return decrypted plain text

std::string Decrypt(const std::string& sPrivateKey, const std::string& sMsgToDecrytp);

};

#endif

void EccEncryption::GenerateEccKeys(unsigned int uiKeySize, std::string& sPrivateKey, std::string& sPublicKey)

{

using namespace CryptoPP;

#if 0

// Random pool, the second parameter is the length of key

// 随机数池，第二个参数是生成密钥的长

AutoSeededRandomPool rnd(false, 256);

ECIES<ECP>::PrivateKey privateKey;

ECIES<ECP>::PublicKey publicKey;

// Generate private key

privateKey.Initialize(rnd, ASN1::secp256r1());

// Generate public key using private key

privateKey.MakePublicKey(publicKey);

#else

Integer p("FFFFFFFF00000001000000000000000000000000FFFFFFFFFFFFFFFFFFFFFFFFh");

std::cout << "modulus:" << std::hex << p << std::endl;

// a、b为椭圆曲线参数

Integer a("FFFFFFFF00000001000000000000000000000000FFFFFFFFFFFFFFFFFFFFFFFCh");

std::cout << "a:" << std::hex << a << std::endl;

Integer b("5AC635D8AA3A93E7B3EBBD55769886BC651D06B0CC53B0F63BCE3C3E27D2604Bh");

std::cout << "b:" << std::hex << b << std::endl;

// 计算基点G的两个参数x、y

Integer x("6B17D1F2E12C4247F8BCE6E563A440F277037D812DEB33A0F4A13945D898C296h");

std::cout << "x:" << std::hex << x << std::endl;

Integer y("4FE342E2FE1A7F9B8EE7EB4A7C0F9E162BCE33576B315ECECBB6406837BF51F5h");

std::cout << "y:" << std::hex << y << std::endl;

Integer order("FFFFFFFF00000000FFFFFFFFFFFFFFFFBCE6FAADA7179E84F3B9CAC2FC632551h");

std::cout << "order:" << std::hex << order << std::endl;

Integer r("100000000000000000000000000000000000000000000000151");

std::cout << "r:" << std::hex << r << std::endl;

Integer k("128B2FA8BD433C6C068C8D803DFF79792A519A55171B1B650C23661D15897263h");

std::cout << "k:" << std::hex << k << std::endl;

Integer sin_k("6CB28D99385C175C94F94E934817663FC176D925DD72B727260DBAAE1FB2F96F");

// 私有密钥

Integer d("76572944925670636209790912427415155085360939712345");

std::cout << "d:" << std::hex << d << std::endl;

// 椭圆曲线

ECP ec(p, a, b);

// 基点G

ECP::Point G(x, y);

std::cout << "G.y:" << std::hex << G.y << std::endl;

ECIES<ECP>::PrivateKey privateKey;

privateKey.Initialize(ec, G, order, x);

// Generate public key using private key

ECIES<ECP>::PublicKey publicKey;

#if 1

privateKey.MakePublicKey(publicKey);

#else

// Q为公开密钥

ECP::Point Q(ec.Multiply(k, G));

publicKey.Initialize(ec, G,order, Q);

#endif

ECIES<ECP>::Encryptor encryptor(publicKey);

HexEncoder pubEncoder(new StringSink(sPublicKey));

publicKey.DEREncode(pubEncoder);

pubEncoder.MessageEnd();

ECIES<ECP>::Decryptor decryptor(privateKey);

HexEncoder prvEncoder(new StringSink(sPrivateKey));

privateKey.DEREncode(prvEncoder);

prvEncoder.MessageEnd();

}

std::string EccEncryption::Encrypt(const std::string& sPublicKey, const std::string& sMsgToEncrypt)

{

using namespace CryptoPP;

// If to save the keys into a file, FileSource should be replace StringSource

StringSource pubString(sPublicKey, true, new HexDecoder);

ECIES<ECP>::Encryptor encryptor(pubString);

// Calculate the length of cipher text

size_t uiCipherTextSize = encryptor.CiphertextLength(sMsgToEncrypt.size());

std::string sCipherText;

sCipherText.resize(uiCipherTextSize);

RandomPool rnd;

encryptor.Encrypt(rnd, (byte*)(sMsgToEncrypt.c_str()), sMsgToEncrypt.size(), (byte*)(sCipherText.data()));

return sCipherText;

}

std::string EccEncryption::Decrypt(const std::string& sPrivateKey, const std::string& sMsgToDecrytp)

{

using namespace CryptoPP;

StringSource privString(sPrivateKey, true, new HexDecoder);

ECIES<ECP>::Decryptor decryptor(privString);

auto sPlainTextLen = decryptor.MaxPlaintextLength(sMsgToDecrytp.size());

std::string sDecryText;

sDecryText.resize(sPlainTextLen);

RandomPool rnd;

decryptor.Decrypt(rnd, (byte*)sMsgToDecrytp.c_str(), sMsgToDecrytp.size(), (byte*)sDecryText.data());

return sDecryText;

}

int test_ECIES_main()

{

std::string sStrToTest = std::string("Hello world. This is an example of Ecc encryption algorithm of Crypto++ open source library.");

EccEncryption ecc;

std::string sPrivateKey, sPublicKey;

ecc.GenerateEccKeys(1024, sPrivateKey, sPublicKey);

std::cout << "Generated private key is : " << std::endl;

std::cout << sPrivateKey << std::endl;