我尝试通过以下示例将XTR-DH应用于“密钥协议”：
//////////////////////////////////////////////////////////////////////////
// Alice
// Initialize the Diffie-Hellman class with a random prime and base
AutoSeededRandomPool rngA;
DH dhA;
dh.Initialize(rngA, 128);
// Extract the prime and base. These values could also have been hard coded
// in the application
Integer iPrime = dhA.GetGroupParameters().GetModulus();
Integer iGenerator = dhA.GetGroupParameters().GetSubgroupGenerator();
SecByteBlock privA(dhA.PrivateKeyLength());
SecByteBlock pubA(dhA.PublicKeyLength());
SecByteBlock secretKeyA(dhA.AgreedValueLength());
// Generate a pair of integers for Alice. The public integer is forwarded to Bob.
dhA.GenerateKeyPair(rngA, privA, pubA);
//////////////////////////////////////////////////////////////////////////
// Bob
AutoSeededRandomPool rngB;
// Initialize the Diffie-Hellman class with the prime and base that Alice generated.
DH dhB(iPrime, iGenerator);
SecByteBlock privB(dhB.PrivateKeyLength());
SecByteBlock pubB(dhB.PublicKeyLength());
SecByteBlock secretKeyB(dhB.AgreedValueLength());
// Generate a pair of integers for Bob. The public integer is forwarded to Alice.
dhB.GenerateKeyPair(rngB, privB, pubB);
//////////////////////////////////////////////////////////////////////////
// Agreement
// Alice calculates the secret key based on her private integer as well as the
// public integer she received from Bob.
if (!dhA.Agree(secretKeyA, privA, pubB))
return false;
// Bob calculates the secret key based on his private integer as well as the
// public integer he received from Alice.
if (!dhB.Agree(secretKeyB, privB, pubA))
return false;
// Just a validation check. Did Alice and Bob agree on the same secret key?
if (VerifyBufsEqualp(secretKeyA.begin(), secretKeyB.begin(), dhA.AgreedValueLength()))
return false;
return true;
这是我的代码：
//Alice
AutoSeededRandomPool aSRPA;
XTR_DH xtrA(aSRPA, 512, 256);
Integer iPrime = xtrA.GetModulus();
Integer i_qnumber = xtrA.GetSubgroupOrder();
Integer iGeneratorc1 = xtrA.GetSubgroupGenerator().c1;
Integer iGeneratorc2 = xtrA.GetSubgroupGenerator().c2;
SecByteBlock privateA(xtrA.PrivateKeyLength());
SecByteBlock publicA(xtrA.PublicKeyLength());
SecByteBlock secretKeyA(xtrA.AgreedValueLength());
xtrA.GenerateKeyPair(aSRPA, privateA, publicA);
//Bob
AutoSeededRandomPool aSRPB;
XTR_DH xtrB(iPrime, i_qnumber, iGeneratorc1); // Use c1 or c2 or both ???
SecByteBlock privB(xtrB.PrivateKeyLength());
SecByteBlock publB(xtrB.PublicKeyLength());
SecByteBlock secretKeyB(xtrB.AgreedValueLength());
xtrB.GenerateKeyPair(aSRPB, privateB, publicB);
// Agreement
// Alice calculates the secret key based on her private integer as well as the
// public integer she received from Bob.
if (!xtrA.Agree(secretKeyA, privateA, publicB))
return false;
// Bob calculates the secret key based on his private integer as well as the
// public integer he received from Alice.
if (!xtrB.Agree(secretKeyB, privateB, publicA))
return false;
// Just a validation check. Did Alice and Bob agree on the same secret key?
if (VerifyBufsEqualp(secretKeyA.begin(), secretKeyB.begin(), xtrA.AgreedValueLength()))
return false;
return true;
我收到此错误
Severity Code Description Project File Line Suppression State
Error C2664 'CryptoPP::XTR_DH::XTR_DH(CryptoPP::XTR_DH &&)': cannot convert argument 3 from 'CryptoPP::Integer' to 'const CryptoPP::GFP2Element &' ConsoleApplication1 d:\tugas akhir\code\consoleapplication1\consoleapplication1\consoleapplication1.cpp 91
我的问题是：
谢谢
答案 0 :(得分：1)
XTR_DH xtrB(iPrime, i_qnumber, iGeneratorc1); // Use c1 or c2 or both ???
您应使用XTR-DH | Constructors中的以下构造函数：
XTR_DH (const Integer &p, const Integer &q, const GFP2Element &g)
有两种设置xtrB的方法。首先，使用构造函数（以及人为的小参数）的方式：
$ cat test.cxx
#include "cryptlib.h"
#include "osrng.h"
#include "xtrcrypt.h"
#include <iostream>
int main()
{
using namespace CryptoPP;
AutoSeededRandomPool aSRP;
XTR_DH xtrA(aSRP, 170, 160);
const Integer& iPrime = xtrA.GetModulus();
const Integer& iOrder = xtrA.GetSubgroupOrder();
const GFP2Element& iGenerator = xtrA.GetSubgroupGenerator();
XTR_DH xtrB(iPrime, iOrder, iGenerator);
std::cout << "Prime: " << std::hex << xtrB.GetModulus() << std::endl;
std::cout << "Order: " << std::hex << xtrB.GetSubgroupOrder() << std::endl;
std::cout << "Generator" << std::endl;
std::cout << " c1: " << std::hex << xtrB.GetSubgroupGenerator().c1 << std::endl;
std::cout << " c2: " << std::hex << xtrB.GetSubgroupGenerator().c2 << std::endl;
return 0;
}
然后：
$ g++ -DNDEBUG -g2 -O3 -fPIC -pthread test.cxx ./libcryptopp.a -o test.exe
$ ./test.exe
Prime: 2d4c4f9f4de9e32e84a7be42f019a1a4139e0fe7489h
Order: 89ab07fa5115443f51ce9a74283affaae2d7748fh
Generator
c1: 684fedbae519cb297f3448d5e564838ede5ed1fb81h
c2: 39112823212ccd7b01f10377536f51bf855752c7a3h
第二，将域参数存储在ASN.1对象中的方法（以及人为的小参数）：
$ cat test.cxx
#include "cryptlib.h"
#include "osrng.h"
#include "files.h"
#include "xtrcrypt.h"
#include <iostream>
int main()
{
using namespace CryptoPP;
AutoSeededRandomPool prng;
XTR_DH xtrA(prng, 170, 160);
xtrA.DEREncode(FileSink("params.der").Ref());
XTR_DH xtrB(FileSource("params.der", true).Ref());
std::cout << "Prime: " << std::hex << xtrB.GetModulus() << std::endl;
std::cout << "Order: " << std::hex << xtrB.GetSubgroupOrder() << std::endl;
std::cout << "Generator" << std::endl;
std::cout << " c1: " << std::hex << xtrB.GetSubgroupGenerator().c1 << std::endl;
std::cout << " c2: " << std::hex << xtrB.GetSubgroupGenerator().c2 << std::endl;
return 0;
}
然后：
$ g++ -DNDEBUG -g2 -O3 -fPIC -pthread test.cxx ./libcryptopp.a -o test.exe
$ ./test.exe
Prime: 2ee076b3254c1520151bbe0391a77971f92e277ba37h
Order: f7674a8c2dd68d32c3da8e74874a48b9adf00fcbh
Generator
c1: 2d469e63b474ac45578a0027a38864f303fad03ba9h
c2: 1d5e5714bc19ef25eee0535584176889df8f26c4802h
最后：
$ dumpasn1 params.der
0 94: SEQUENCE {
2 22: INTEGER 02 EE 07 6B 32 54 C1 52 01 51 BB E0 39 1A 77 97 1F 92 E2 77 BA 37
26 21: INTEGER 00 F7 67 4A 8C 2D D6 8D 32 C3 DA 8E 74 87 4A 48 B9 AD F0 0F CB
49 21: INTEGER 2D 46 9E 63 B4 74 AC 45 57 8A 00 27 A3 88 64 F3 03 FA D0 3B A9
72 22: INTEGER 01 D5 E5 71 4B C1 9E F2 5E EE 05 35 58 41 76 88 9D F8 F2 6C 48 02
: }
在实践中，您可能想要使用类似这样的方法，该方法在加载参数之后对其进行验证。您应该始终验证安全参数。
// Load the domain parameters from somewhere
const Integer& iPrime = ...;
const Integer& iOrder = ...;
const GFP2Element& iGenerator = ...;
// Create the key agreement object using the parameters
XTR_DH xtrB(iPrime, iOrder, iGenerator);
// Verify the the parameters using the key agreement object
if(xtrB.Validate(aSRP, 3) == false)
throw std::runtime_error("Failed to validate parameters");
您可能将使用上面显示的第二种方法。也就是说，您将只生成一次域参数，然后双方都将使用它们。双方xtrA和xtrB下方使用params.der：
int main()
{
using namespace CryptoPP;
AutoSeededRandomPool prng;
XTR_DH xtrA(FileSource("params.der", true).Ref());
XTR_DH xtrB(FileSource("params.der", true).Ref());
if(xtrA.Validate(prng, 3) == false)
throw std::runtime_error("Failed to validate parameters");
if(xtrB.Validate(prng, 3) == false)
throw std::runtime_error("Failed to validate parameters");
...
}