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Implementation of the Licensing System for a Software Product

, , 5 Aug 2010 CPOL
This article is devoted to the development of the key licensing system for the applications.
bin.zip
bin
ClientTest.exe
DigitalSignature.exe
src.zip
src
src
ClientTest
keys
public.bin
cryptopp560
adhoc.cpp.copied
adhoc.cpp.proto
cryptdll.dsp
cryptest.dsp
cryptest.dsw
cryptest_bds.bdsgroup
cryptest_bds.bdsproj
cryptest_bds.bpf
cryptlib.dsp
cryptlib_bds.bdsproj
dlltest.dsp
Doxyfile
GNUmakefile
DigitalSignature
keys
private.bin
public.bin
Utils
#ifndef CRYPTOPP_DLL_ONLY
#define CRYPTOPP_DEFAULT_NO_DLL
#endif

#include "dll.h"
#include <iostream>

USING_NAMESPACE(CryptoPP)
USING_NAMESPACE(std)

void FIPS140_SampleApplication()
{
	if (!FIPS_140_2_ComplianceEnabled())
	{
		cerr << "FIPS 140-2 compliance was turned off at compile time.\n";
		abort();
	}

	// check self test status
	if (GetPowerUpSelfTestStatus() != POWER_UP_SELF_TEST_PASSED)
	{
		cerr << "Automatic power-up self test failed.\n";
		abort();
	}
	cout << "0. Automatic power-up self test passed.\n";

	// simulate a power-up self test error
	SimulatePowerUpSelfTestFailure();
	try
	{
		// trying to use a crypto algorithm after power-up self test error will result in an exception
		AES::Encryption aes;

		// should not be here
		cerr << "Use of AES failed to cause an exception after power-up self test error.\n";
		abort();
	}
	catch (SelfTestFailure &e)
	{
		cout << "1. Caught expected exception when simulating self test failure. Exception message follows: ";
		cout << e.what() << endl;
	}

	// clear the self test error state and redo power-up self test
	DoDllPowerUpSelfTest();
	if (GetPowerUpSelfTestStatus() != POWER_UP_SELF_TEST_PASSED)
	{
		cerr << "Re-do power-up self test failed.\n";
		abort();
	}
	cout << "2. Re-do power-up self test passed.\n";

	// encrypt and decrypt
	const byte key[] = {0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef, 0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef, 0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef};
	const byte iv[] = {0x12,0x34,0x56,0x78,0x90,0xab,0xcd,0xef};
	const byte plaintext[] = {	// "Now is the time for all " without tailing 0
		0x4e,0x6f,0x77,0x20,0x69,0x73,0x20,0x74,
		0x68,0x65,0x20,0x74,0x69,0x6d,0x65,0x20,
		0x66,0x6f,0x72,0x20,0x61,0x6c,0x6c,0x20};
	byte ciphertext[24];
	byte decrypted[24];

	CFB_FIPS_Mode<DES_EDE3>::Encryption encryption_DES_EDE3_CFB;
	encryption_DES_EDE3_CFB.SetKeyWithIV(key, sizeof(key), iv);
	encryption_DES_EDE3_CFB.ProcessString(ciphertext, plaintext, 24);

	CFB_FIPS_Mode<DES_EDE3>::Decryption decryption_DES_EDE3_CFB;
	decryption_DES_EDE3_CFB.SetKeyWithIV(key, sizeof(key), iv);
	decryption_DES_EDE3_CFB.ProcessString(decrypted, ciphertext, 24);

	if (memcmp(plaintext, decrypted, 24) != 0)
	{
		cerr << "DES-EDE3-CFB Encryption/decryption failed.\n";
		abort();
	}
	cout << "3. DES-EDE3-CFB Encryption/decryption succeeded.\n";

	// hash
	const byte message[] = {'a', 'b', 'c'};
	const byte expectedDigest[] = {0xA9,0x99,0x3E,0x36,0x47,0x06,0x81,0x6A,0xBA,0x3E,0x25,0x71,0x78,0x50,0xC2,0x6C,0x9C,0xD0,0xD8,0x9D};
	byte digest[20];
	
	SHA1 sha;
	sha.Update(message, 3);
	sha.Final(digest);

	if (memcmp(digest, expectedDigest, 20) != 0)
	{
		cerr << "SHA-1 hash failed.\n";
		abort();
	}
	cout << "4. SHA-1 hash succeeded.\n";

	// create auto-seeded X9.17 RNG object, if available
#ifdef OS_RNG_AVAILABLE
	AutoSeededX917RNG<AES> rng;
#else
	// this is used to allow this function to compile on platforms that don't have auto-seeded RNGs
	RandomNumberGenerator &rng(NullRNG());
#endif

	// generate DSA key
	DSA::PrivateKey dsaPrivateKey;
	dsaPrivateKey.GenerateRandomWithKeySize(rng, 1024);
	DSA::PublicKey dsaPublicKey;
	dsaPublicKey.AssignFrom(dsaPrivateKey);
	if (!dsaPrivateKey.Validate(rng, 3) || !dsaPublicKey.Validate(rng, 3))
	{
		cerr << "DSA key generation failed.\n";
		abort();
	}
	cout << "5. DSA key generation succeeded.\n";

	// encode DSA key
	std::string encodedDsaPublicKey, encodedDsaPrivateKey;
	dsaPublicKey.DEREncode(StringSink(encodedDsaPublicKey).Ref());
	dsaPrivateKey.DEREncode(StringSink(encodedDsaPrivateKey).Ref());

	// decode DSA key
	DSA::PrivateKey decodedDsaPrivateKey;
	decodedDsaPrivateKey.BERDecode(StringStore(encodedDsaPrivateKey).Ref());
	DSA::PublicKey decodedDsaPublicKey;
	decodedDsaPublicKey.BERDecode(StringStore(encodedDsaPublicKey).Ref());

	if (!decodedDsaPrivateKey.Validate(rng, 3) || !decodedDsaPublicKey.Validate(rng, 3))
	{
		cerr << "DSA key encode/decode failed.\n";
		abort();
	}
	cout << "6. DSA key encode/decode succeeded.\n";

	// sign and verify
	byte signature[40];
	DSA::Signer signer(dsaPrivateKey);
	assert(signer.SignatureLength() == 40);
	signer.SignMessage(rng, message, 3, signature);

	DSA::Verifier verifier(dsaPublicKey);
	if (!verifier.VerifyMessage(message, 3, signature, sizeof(signature)))
	{
		cerr << "DSA signature and verification failed.\n";
		abort();
	}
	cout << "7. DSA signature and verification succeeded.\n";


	// try to verify an invalid signature
	signature[0] ^= 1;
	if (verifier.VerifyMessage(message, 3, signature, sizeof(signature)))
	{
		cerr << "DSA signature verification failed to detect bad signature.\n";
		abort();
	}
	cout << "8. DSA signature verification successfully detected bad signature.\n";

	// try to use an invalid key length
	try
	{
		ECB_Mode<DES_EDE3>::Encryption encryption_DES_EDE3_ECB;
		encryption_DES_EDE3_ECB.SetKey(key, 5);

		// should not be here
		cerr << "DES-EDE3 implementation did not detect use of invalid key length.\n";
		abort();
	}
	catch (InvalidArgument &e)
	{
		cout << "9. Caught expected exception when using invalid key length. Exception message follows: ";
		cout << e.what() << endl;
	}

	cout << "\nFIPS 140-2 Sample Application completed normally.\n";
}

#ifdef CRYPTOPP_IMPORTS

static PNew s_pNew = NULL;
static PDelete s_pDelete = NULL;

extern "C" __declspec(dllexport) void __cdecl SetNewAndDeleteFromCryptoPP(PNew pNew, PDelete pDelete, PSetNewHandler pSetNewHandler)
{
	s_pNew = pNew;
	s_pDelete = pDelete;
}

void * __cdecl operator new (size_t size)
{
	return s_pNew(size);
}

void __cdecl operator delete (void * p)
{
	s_pDelete(p);
}

#endif

#ifdef CRYPTOPP_DLL_ONLY

int __cdecl main()
{
	FIPS140_SampleApplication();
	return 0;
}

#endif

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Authors

Apriorit Inc
Apriorit Inc.
Ukraine Ukraine
ApriorIT is a Software Research and Development company that works in advanced knowledge-intensive scopes.
 
Company offers integrated research&development services for the software projects in such directions as Corporate Security, Remote Control, Mobile Development, Embedded Systems, Virtualization, Drivers and others.
 
Official site http://www.apriorit.com
Group type: Organisation

31 members

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Sergii Bratus
Software Developer Apriorit Inc.
Ukraine Ukraine
No Biography provided

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