path: root/crypto.cpp

/*
    This file is part of cpp-ethereum.

    cpp-ethereum is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    cpp-ethereum is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
*/
/** @file crypto.cpp
 * @author Gav Wood <i@gavwood.com>
 * @date 2014
 * Crypto test functions.
 */

#include <random>
#include <secp256k1/secp256k1.h>
#include <libdevcore/Common.h>
#include <libdevcore/RLP.h>
#include <libdevcore/Log.h>
#include <libethereum/Transaction.h>
#include <boost/test/unit_test.hpp>
#include <libdevcrypto/SHA3.h>
#include <libdevcrypto/ECDHE.h>
#include <libdevcrypto/CryptoPP.h>

using namespace std;
using namespace dev;
using namespace dev::crypto;
using namespace CryptoPP;

BOOST_AUTO_TEST_SUITE(devcrypto)

static Secp256k1 s_secp256k1;
static CryptoPP::AutoSeededRandomPool s_rng;
static CryptoPP::OID s_curveOID(CryptoPP::ASN1::secp256k1());
static CryptoPP::DL_GroupParameters_EC<CryptoPP::ECP> s_params(s_curveOID);
static CryptoPP::DL_GroupParameters_EC<CryptoPP::ECP>::EllipticCurve s_curve(s_params.GetCurve());

BOOST_AUTO_TEST_CASE(cryptopp_patch)
{
    KeyPair k = KeyPair::create();
    bytes io_text;
    s_secp256k1.decrypt(k.sec(), io_text);
    BOOST_REQUIRE_EQUAL(io_text.size(), 0);
}

BOOST_AUTO_TEST_CASE(verify_secert)
{
    h256 empty;
    KeyPair kNot(empty);
    BOOST_REQUIRE(!kNot.address());
    KeyPair k(sha3(empty));
    BOOST_REQUIRE(k.address());
}

BOOST_AUTO_TEST_CASE(common_encrypt_decrypt)
{
    string message("Now is the time for all good persons to come to the aid of humanity.");
    bytes m = asBytes(message);
    bytesConstRef bcr(&m);

    KeyPair k = KeyPair::create();
    bytes cipher;
    encrypt(k.pub(), bcr, cipher);
    BOOST_REQUIRE(cipher != asBytes(message) && cipher.size() > 0);
    
    bytes plain;
    decrypt(k.sec(), bytesConstRef(&cipher), plain);
    
    BOOST_REQUIRE(asString(plain) == message);
    BOOST_REQUIRE(plain == asBytes(message));
}

BOOST_AUTO_TEST_CASE(cryptopp_cryptopp_secp256k1libport)
{
    secp256k1_start();
    
    // base secret
    Secret secret(sha3("privacy"));
    
    // we get ec params from signer
    ECDSA<ECP, SHA3_256>::Signer signer;
    
    // e := sha3(msg)
    bytes e(fromHex("0x01"));
    e.resize(32);
    int tests = 2;
    while (sha3(&e, &e), secret = sha3(secret.asBytes()), tests--)
    {
        KeyPair key(secret);
        Public pkey = key.pub();
        signer.AccessKey().Initialize(s_params, secretToExponent(secret));
        
        h256 he(sha3(e));
        Integer heInt(he.asBytes().data(), 32);
        h256 k(crypto::kdf(secret, he));
        Integer kInt(k.asBytes().data(), 32);
        kInt %= s_params.GetSubgroupOrder()-1;

        ECP::Point rp = s_params.ExponentiateBase(kInt);
        Integer const& q = s_params.GetGroupOrder();
        Integer r = s_params.ConvertElementToInteger(rp);

        Integer kInv = kInt.InverseMod(q);
        Integer s = (kInv * (Integer(secret.asBytes().data(), 32)*r + heInt)) % q;
        BOOST_REQUIRE(!!r && !!s);

        Signature sig;
        sig[64] = rp.y.IsOdd() ? 1 : 0;
        r.Encode(sig.data(), 32);
        s.Encode(sig.data() + 32, 32);

        Public p = dev::recover(sig, he);
        BOOST_REQUIRE(p == pkey);
        
        // verify w/cryptopp
        BOOST_REQUIRE(s_secp256k1.verify(pkey, sig, bytesConstRef(&e)));
        
        // verify with secp256k1lib
        byte encpub[65] = {0x04};
        memcpy(&encpub[1], pkey.data(), 64);
        byte dersig[72];
        size_t cssz = DSAConvertSignatureFormat(dersig, 72, DSA_DER, sig.data(), 64, DSA_P1363);
        BOOST_CHECK(cssz <= 72);
        BOOST_REQUIRE(1 == secp256k1_ecdsa_verify(he.data(), sizeof(he), dersig, cssz, encpub, 65));
    }
}

BOOST_AUTO_TEST_CASE(cryptopp_ecdsa_sipaseckp256k1)
{
    secp256k1_start();
    
    // cryptopp integer encoding
    Integer nHex("f2ee15ea639b73fa3db9b34a245bdfa015c260c598b211bf05a1ecc4b3e3b4f2H");
    Integer nB(fromHex("f2ee15ea639b73fa3db9b34a245bdfa015c260c598b211bf05a1ecc4b3e3b4f2").data(), 32);
    BOOST_REQUIRE(nHex == nB);
    
    bytes sbytes(fromHex("0xFFFF"));
    Secret secret(sha3(sbytes));
    KeyPair key(secret);
    
    bytes m(1, 0xff);
    int tests = 2;
    while (m[0]++, tests--)
    {
        h256 hm(sha3(m));
        Integer hInt(hm.asBytes().data(), 32);
        h256 k(hm ^ key.sec());
        Integer kInt(k.asBytes().data(), 32);

        // raw sign w/cryptopp (doesn't pass through cryptopp hash filter)
        ECDSA<ECP, SHA3_256>::Signer signer;
        signer.AccessKey().Initialize(s_params, secretToExponent(key.sec()));
        Integer r, s;
        signer.RawSign(kInt, hInt, r, s);

        // verify cryptopp raw-signature w/cryptopp
        ECDSA<ECP, SHA3_256>::Verifier verifier;
        verifier.AccessKey().Initialize(s_params, publicToPoint(key.pub()));
        Signature sigppraw;
        r.Encode(sigppraw.data(), 32);
        s.Encode(sigppraw.data() + 32, 32);
        BOOST_REQUIRE(verifier.VerifyMessage(m.data(), m.size(), sigppraw.data(), 64));
//      BOOST_REQUIRE(crypto::verify(key.pub(), sigppraw, bytesConstRef(&m)));
        BOOST_REQUIRE(dev::verify(key.pub(), sigppraw, hm));
        
        // sign with cryptopp, verify, recover w/sec256lib
        Signature seclibsig(dev::sign(key.sec(), hm));
        BOOST_REQUIRE(verifier.VerifyMessage(m.data(), m.size(), seclibsig.data(), 64));
//      BOOST_REQUIRE(crypto::verify(key.pub(), seclibsig, bytesConstRef(&m)));
        BOOST_REQUIRE(dev::verify(key.pub(), seclibsig, hm));
        BOOST_REQUIRE(dev::recover(seclibsig, hm) == key.pub());

        // sign with cryptopp (w/hash filter?), verify with cryptopp
        bytes sigppb(signer.MaxSignatureLength());
        size_t ssz = signer.SignMessage(s_rng, m.data(), m.size(), sigppb.data());
        Signature sigpp;
        memcpy(sigpp.data(), sigppb.data(), 64);
        BOOST_REQUIRE(verifier.VerifyMessage(m.data(), m.size(), sigppb.data(), ssz));
//      BOOST_REQUIRE(crypto::verify(key.pub(), sigpp, bytesConstRef(&m)));
        BOOST_REQUIRE(dev::verify(key.pub(), sigpp, hm));

        // sign with cryptopp and stringsource hash filter
        string sigstr;
        StringSource ssrc(asString(m), true, new SignerFilter(s_rng, signer, new StringSink(sigstr)));
        FixedHash<sizeof(Signature)> retsig((byte const*)sigstr.data(), Signature::ConstructFromPointer);
        BOOST_REQUIRE(verifier.VerifyMessage(m.data(), m.size(), retsig.data(), 64));
//      BOOST_REQUIRE(crypto::verify(key.pub(), retsig, bytesConstRef(&m)));
        BOOST_REQUIRE(dev::verify(key.pub(), retsig, hm));
        
        /// verification w/sec256lib
        // requires public key and sig in standard format
        byte encpub[65] = {0x04};
        memcpy(&encpub[1], key.pub().data(), 64);
        byte dersig[72];
        
        // verify sec256lib sig w/sec256lib
        size_t cssz = DSAConvertSignatureFormat(dersig, 72, DSA_DER, seclibsig.data(), 64, DSA_P1363);
        BOOST_CHECK(cssz <= 72);
        BOOST_REQUIRE(1 == secp256k1_ecdsa_verify(hm.data(), sizeof(hm), dersig, cssz, encpub, 65));
        
        // verify cryptopp-raw sig w/sec256lib
        cssz = DSAConvertSignatureFormat(dersig, 72, DSA_DER, sigppraw.data(), 64, DSA_P1363);
        BOOST_CHECK(cssz <= 72);
        BOOST_REQUIRE(1 == secp256k1_ecdsa_verify(hm.data(), sizeof(hm), dersig, cssz, encpub, 65));

        // verify cryptopp sig w/sec256lib
        cssz = DSAConvertSignatureFormat(dersig, 72, DSA_DER, sigppb.data(), 64, DSA_P1363);
        BOOST_CHECK(cssz <= 72);
        BOOST_REQUIRE(1 == secp256k1_ecdsa_verify(hm.data(), sizeof(hm), dersig, cssz, encpub, 65));
    }
}

BOOST_AUTO_TEST_CASE(ecies_eckeypair)
{
    KeyPair k = KeyPair::create();

    string message("Now is the time for all good persons to come to the aid of humanity.");
    string original = message;
    
    bytes b = asBytes(message);
    s_secp256k1.encrypt(k.pub(), b);
    BOOST_REQUIRE(b != asBytes(original));

    s_secp256k1.decrypt(k.sec(), b);
    BOOST_REQUIRE(b == asBytes(original));
}

BOOST_AUTO_TEST_CASE(ecdh)
{
    cnote << "Testing ecdh...";

    ECDH<ECP>::Domain dhLocal(s_curveOID);
    SecByteBlock privLocal(dhLocal.PrivateKeyLength());
    SecByteBlock pubLocal(dhLocal.PublicKeyLength());
    dhLocal.GenerateKeyPair(s_rng, privLocal, pubLocal);
    
    ECDH<ECP>::Domain dhRemote(s_curveOID);
    SecByteBlock privRemote(dhRemote.PrivateKeyLength());
    SecByteBlock pubRemote(dhRemote.PublicKeyLength());
    dhRemote.GenerateKeyPair(s_rng, privRemote, pubRemote);
    
    assert(dhLocal.AgreedValueLength() == dhRemote.AgreedValueLength());
    
    // local: send public to remote; remote: send public to local
    
    // Local
    SecByteBlock sharedLocal(dhLocal.AgreedValueLength());
    assert(dhLocal.Agree(sharedLocal, privLocal, pubRemote));
    
    // Remote
    SecByteBlock sharedRemote(dhRemote.AgreedValueLength());
    assert(dhRemote.Agree(sharedRemote, privRemote, pubLocal));
    
    // Test
    Integer ssLocal, ssRemote;
    ssLocal.Decode(sharedLocal.BytePtr(), sharedLocal.SizeInBytes());
    ssRemote.Decode(sharedRemote.BytePtr(), sharedRemote.SizeInBytes());
    
    assert(ssLocal != 0);
    assert(ssLocal == ssRemote);
    
    
    // Now use our keys
    KeyPair a = KeyPair::create();
    byte puba[65] = {0x04};
    memcpy(&puba[1], a.pub().data(), 64);
    
    KeyPair b = KeyPair::create();
    byte pubb[65] = {0x04};
    memcpy(&pubb[1], b.pub().data(), 64);
    
    ECDH<ECP>::Domain dhA(s_curveOID);
    Secret shared;
    BOOST_REQUIRE(dhA.Agree(shared.data(), a.sec().data(), pubb));
    BOOST_REQUIRE(shared);
}

BOOST_AUTO_TEST_CASE(ecdhe)
{
    cnote << "Testing ecdhe...";
    
    ECDHE a, b;
    BOOST_CHECK_NE(a.pubkey(), b.pubkey());
    
    ECDHE local;
    ECDHE remote;
    
    // local tx pubkey -> remote
    Secret sremote;
    remote.agree(local.pubkey(), sremote);
    
    // remote tx pbukey -> local
    Secret slocal;
    local.agree(remote.pubkey(), slocal);

    BOOST_REQUIRE(sremote);
    BOOST_REQUIRE(slocal);
    BOOST_REQUIRE_EQUAL(sremote, slocal);
}

BOOST_AUTO_TEST_CASE(ecdhe_aes128_ctr_sha3mac)
{
    // New connections require new ECDH keypairs
    // Every new connection requires a new EC keypair
    // Every new trust requires a new EC keypair
    // All connections should share seed for PRF (or PRNG) for nonces
    
    
}

BOOST_AUTO_TEST_CASE(cryptopp_aes128_ctr)
{
    const int aesKeyLen = 16;
    BOOST_REQUIRE(sizeof(char) == sizeof(byte));
    
    // generate test key
    AutoSeededRandomPool rng;
    SecByteBlock key(0x00, aesKeyLen);
    rng.GenerateBlock(key, key.size());
    
    // cryptopp uses IV as nonce/counter which is same as using nonce w/0 ctr
    FixedHash<AES::BLOCKSIZE> ctr;
    rng.GenerateBlock(ctr.data(), sizeof(ctr));

    // used for decrypt
    FixedHash<AES::BLOCKSIZE> ctrcopy(ctr);
    
    string text = "Now is the time for all good persons to come to the aid of humanity.";
    unsigned char const* in = (unsigned char*)&text[0];
    unsigned char* out = (unsigned char*)&text[0];
    string original = text;
    string doublespeak = text + text;
    
    string cipherCopy;
    try
    {
        CTR_Mode<AES>::Encryption e;
        e.SetKeyWithIV(key, key.size(), ctr.data());
        
        // 68 % 255 should be difference of counter
        e.ProcessData(out, in, text.size());
        ctr = h128(u128(ctr) + text.size() % 16);
        
        BOOST_REQUIRE(text != original);
        cipherCopy = text;
    }
    catch(CryptoPP::Exception& e)
    {
        cerr << e.what() << endl;
    }
    
    try
    {
        CTR_Mode< AES >::Decryption d;
        d.SetKeyWithIV(key, key.size(), ctrcopy.data());
        d.ProcessData(out, in, text.size());
        BOOST_REQUIRE(text == original);
    }
    catch(CryptoPP::Exception& e)
    {
        cerr << e.what() << endl;
    }
    
    
    // reencrypt ciphertext...
    try
    {
        BOOST_REQUIRE(cipherCopy != text);
        in = (unsigned char*)&cipherCopy[0];
        out = (unsigned char*)&cipherCopy[0];
        
        CTR_Mode<AES>::Encryption e;
        e.SetKeyWithIV(key, key.size(), ctrcopy.data());
        e.ProcessData(out, in, text.size());
        
        // yep, ctr mode.
        BOOST_REQUIRE(cipherCopy == original);
    }
    catch(CryptoPP::Exception& e)
    {
        cerr << e.what() << endl;
    }
    
}

BOOST_AUTO_TEST_CASE(cryptopp_aes128_cbc)
{
    const int aesKeyLen = 16;
    BOOST_REQUIRE(sizeof(char) == sizeof(byte));
    
    AutoSeededRandomPool rng;
    SecByteBlock key(0x00, aesKeyLen);
    rng.GenerateBlock(key, key.size());
    
    // Generate random IV
    byte iv[AES::BLOCKSIZE];
    rng.GenerateBlock(iv, AES::BLOCKSIZE);
    
    string string128("AAAAAAAAAAAAAAAA");
    string plainOriginal = string128;
    
    CryptoPP::CBC_Mode<Rijndael>::Encryption cbcEncryption(key, key.size(), iv);
    cbcEncryption.ProcessData((byte*)&string128[0], (byte*)&string128[0], string128.size());
    BOOST_REQUIRE(string128 != plainOriginal);
    
    CBC_Mode<Rijndael>::Decryption cbcDecryption(key, key.size(), iv);
    cbcDecryption.ProcessData((byte*)&string128[0], (byte*)&string128[0], string128.size());
    BOOST_REQUIRE(plainOriginal == string128);
    
    
    // plaintext whose size isn't divisible by block size must use stream filter for padding
    string string192("AAAAAAAAAAAAAAAABBBBBBBB");
    plainOriginal = string192;

    string cipher;
    StreamTransformationFilter* aesStream = new StreamTransformationFilter(cbcEncryption, new StringSink(cipher));
    StringSource source(string192, true, aesStream);
    BOOST_REQUIRE(cipher.size() == 32);

    cbcDecryption.ProcessData((byte*)&cipher[0], (byte*)&string192[0], cipher.size());
    BOOST_REQUIRE(string192 == plainOriginal);
}

BOOST_AUTO_TEST_CASE(eth_keypairs)
{
    cnote << "Testing Crypto...";
    secp256k1_start();

    KeyPair p(Secret(fromHex("3ecb44df2159c26e0f995712d4f39b6f6e499b40749b1cf1246c37f9516cb6a4")));
    BOOST_REQUIRE(p.pub() == Public(fromHex("97466f2b32bc3bb76d4741ae51cd1d8578b48d3f1e68da206d47321aec267ce78549b514e4453d74ef11b0cd5e4e4c364effddac8b51bcfc8de80682f952896f")));
    BOOST_REQUIRE(p.address() == Address(fromHex("8a40bfaa73256b60764c1bf40675a99083efb075")));
    {
        eth::Transaction t(1000, 0, 0, h160(fromHex("944400f4b88ac9589a0f17ed4671da26bddb668b")), bytes(), 0, p.secret());
        auto rlp = t.rlp(eth::WithoutSignature);
        cnote << RLP(rlp);
        cnote << toHex(rlp);
        cnote << t.sha3(eth::WithoutSignature);
        rlp = t.rlp(eth::WithSignature);
        cnote << RLP(rlp);
        cnote << toHex(rlp);
        cnote << t.sha3(eth::WithSignature);
        BOOST_REQUIRE(t.sender() == p.address());
    }

} 
 

int cryptoTest()
{
    cnote << "Testing Crypto...";
    secp256k1_start();

    KeyPair p(Secret(fromHex("3ecb44df2159c26e0f995712d4f39b6f6e499b40749b1cf1246c37f9516cb6a4")));
    BOOST_REQUIRE(p.pub() == Public(fromHex("97466f2b32bc3bb76d4741ae51cd1d8578b48d3f1e68da206d47321aec267ce78549b514e4453d74ef11b0cd5e4e4c364effddac8b51bcfc8de80682f952896f")));
    BOOST_REQUIRE(p.address() == Address(fromHex("8a40bfaa73256b60764c1bf40675a99083efb075")));
    {
        eth::Transaction t(1000, 0, 0, h160(fromHex("944400f4b88ac9589a0f17ed4671da26bddb668b")), bytes(), 0, p.secret());
        auto rlp = t.rlp(eth::WithoutSignature);
        cnote << RLP(rlp);
        cnote << toHex(rlp);
        cnote << t.sha3(eth::WithoutSignature);
        rlp = t.rlp(eth::WithSignature);
        cnote << RLP(rlp);
        cnote << toHex(rlp);
        cnote << t.sha3(eth::WithSignature);
        assert(t.sender() == p.address());
    }


#if 0
    // Test transaction.
    bytes tx = fromHex("88005401010101010101010101010101010101010101011f0de0b6b3a76400001ce8d4a5100080181c373130a009ba1f10285d4e659568bfcfec85067855c5a3c150100815dad4ef98fd37cf0593828c89db94bd6c64e210a32ef8956eaa81ea9307194996a3b879441f5d");
    cout << "TX: " << RLP(tx) << endl;

    Transaction t2(tx);
    cout << "SENDER: " << hex << t2.sender() << dec << endl;

    secp256k1_start();

    Transaction t;
    t.nonce = 0;
    t.value = 1;            // 1 wei.
    t.type = eth::Transaction::MessageCall;
    t.receiveAddress = toAddress(sha3("123"));

    bytes sig64 = toBigEndian(t.vrs.r) + toBigEndian(t.vrs.s);
    cout << "SIG: " << sig64.size() << " " << toHex(sig64) << " " << t.vrs.v << endl;

    auto msg = t.rlp(false);
    cout << "TX w/o SIG: " << RLP(msg) << endl;
    cout << "RLP(TX w/o SIG): " << toHex(t.rlp(false)) << endl;
    std::string hmsg = sha3(t.rlp(false), false);
    cout << "SHA256(RLP(TX w/o SIG)): 0x" << toHex(hmsg) << endl;

    bytes privkey = sha3Bytes("123");

    {
        bytes pubkey(65);
        int pubkeylen = 65;

        int ret = secp256k1_ecdsa_seckey_verify(privkey.data());
        cout << "SEC: " << dec << ret << " " << toHex(privkey) << endl;

        ret = secp256k1_ecdsa_pubkey_create(pubkey.data(), &pubkeylen, privkey.data(), 1);
        pubkey.resize(pubkeylen);
        int good = secp256k1_ecdsa_pubkey_verify(pubkey.data(), (int)pubkey.size());
        cout << "PUB: " << dec << ret << " " << pubkeylen << " " << toHex(pubkey) << (good ? " GOOD" : " BAD") << endl;
    }

    // Test roundtrip...
    {
        bytes sig(64);
        u256 nonce = 0;
        int v = 0;
        cout << toHex(hmsg) << endl;
        cout << toHex(privkey) << endl;
        cout << hex << nonce << dec << endl;
        int ret = secp256k1_ecdsa_sign_compact((byte const*)hmsg.data(), (int)hmsg.size(), sig.data(), privkey.data(), (byte const*)&nonce, &v);
        cout << "MYSIG: " << dec << ret << " " << sig.size() << " " << toHex(sig) << " " << v << endl;

        bytes pubkey(65);
        int pubkeylen = 65;
        ret = secp256k1_ecdsa_recover_compact((byte const*)hmsg.data(), (int)hmsg.size(), (byte const*)sig.data(), pubkey.data(), &pubkeylen, 0, v);
        pubkey.resize(pubkeylen);
        cout << "MYREC: " << dec << ret << " " << pubkeylen << " " << toHex(pubkey) << endl;
    }

    {
        bytes pubkey(65);
        int pubkeylen = 65;
        int ret = secp256k1_ecdsa_recover_compact((byte const*)hmsg.data(), (int)hmsg.size(), (byte const*)sig64.data(), pubkey.data(), &pubkeylen, 0, (int)t.vrs.v - 27);
        pubkey.resize(pubkeylen);
        cout << "RECPUB: " << dec << ret << " " << pubkeylen << " " << toHex(pubkey) << endl;
        cout << "SENDER: " << hex << toAddress(dev::sha3(bytesConstRef(&pubkey).cropped(1))) << dec << endl;
    }
#endif
    return 0;
}

BOOST_AUTO_TEST_SUITE_END()