r1

src/crypter.cpp

@@ -0,0 +1,451 @@
+// Copyright (c) 2009-2013 The Bitcoin developers
+// Copyright (c) 2017-2019 The PIVX developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include "crypter.h"
+
+#include "script/script.h"
+#include "script/standard.h"
+#include "util.h"
+#include "init.h"
+#include "uint256.h"
+
+#include <openssl/aes.h>
+#include <openssl/evp.h>
+#include "wallet/wallet.h"
+
+bool CCrypter::SetKeyFromPassphrase(const SecureString& strKeyData, const std::vector<unsigned char>& chSalt, const unsigned int nRounds, const unsigned int nDerivationMethod)
+{
+    if (nRounds < 1 || chSalt.size() != WALLET_CRYPTO_SALT_SIZE)
+        return false;
+
+    int i = 0;
+    if (nDerivationMethod == 0)
+        i = EVP_BytesToKey(EVP_aes_256_cbc(), EVP_sha512(), &chSalt[0],
+            (unsigned char*)&strKeyData[0], strKeyData.size(), nRounds, chKey, chIV);
+
+    if (i != (int)WALLET_CRYPTO_KEY_SIZE) {
+        memory_cleanse(chKey, sizeof(chKey));
+        memory_cleanse(chIV, sizeof(chIV));
+        return false;
+    }
+
+    fKeySet = true;
+    return true;
+}
+
+bool CCrypter::SetKey(const CKeyingMaterial& chNewKey, const std::vector<unsigned char>& chNewIV)
+{
+    if (chNewKey.size() != WALLET_CRYPTO_KEY_SIZE || chNewIV.size() != WALLET_CRYPTO_KEY_SIZE)
+        return false;
+
+    memcpy(&chKey[0], &chNewKey[0], sizeof chKey);
+    memcpy(&chIV[0], &chNewIV[0], sizeof chIV);
+
+    fKeySet = true;
+    return true;
+}
+
+bool CCrypter::Encrypt(const CKeyingMaterial& vchPlaintext, std::vector<unsigned char>& vchCiphertext)
+{
+    if (!fKeySet)
+        return false;
+
+    // max ciphertext len for a n bytes of plaintext is
+    // n + AES_BLOCK_SIZE - 1 bytes
+    int nLen = vchPlaintext.size();
+    int nCLen = nLen + AES_BLOCK_SIZE, nFLen = 0;
+    vchCiphertext = std::vector<unsigned char>(nCLen);
+
+    bool fOk = true;
+
+    EVP_CIPHER_CTX* ctx = EVP_CIPHER_CTX_new();
+    if (fOk) fOk = EVP_EncryptInit_ex(ctx, EVP_aes_256_cbc(), NULL, chKey, chIV) != 0;
+    if (fOk) fOk = EVP_EncryptUpdate(ctx, &vchCiphertext[0], &nCLen, &vchPlaintext[0], nLen) != 0;
+    if (fOk) fOk = EVP_EncryptFinal_ex(ctx, (&vchCiphertext[0]) + nCLen, &nFLen) != 0;
+    EVP_CIPHER_CTX_free(ctx);
+
+    if (!fOk) return false;
+
+    vchCiphertext.resize(nCLen + nFLen);
+    return true;
+}
+
+bool CCrypter::Decrypt(const std::vector<unsigned char>& vchCiphertext, CKeyingMaterial& vchPlaintext)
+{
+    if (!fKeySet)
+        return false;
+
+    // plaintext will always be equal to or lesser than length of ciphertext
+    int nLen = vchCiphertext.size();
+    int nPLen = nLen, nFLen = 0;
+
+    vchPlaintext = CKeyingMaterial(nPLen);
+
+    bool fOk = true;
+
+    EVP_CIPHER_CTX* ctx = EVP_CIPHER_CTX_new();
+    if (fOk) fOk = EVP_DecryptInit_ex(ctx, EVP_aes_256_cbc(), NULL, chKey, chIV) != 0;
+    if (fOk) fOk = EVP_DecryptUpdate(ctx, &vchPlaintext[0], &nPLen, &vchCiphertext[0], nLen) != 0;
+    if (fOk) fOk = EVP_DecryptFinal_ex(ctx, (&vchPlaintext[0]) + nPLen, &nFLen) != 0;
+    EVP_CIPHER_CTX_free(ctx);
+
+    if (!fOk) return false;
+
+    vchPlaintext.resize(nPLen + nFLen);
+    return true;
+}
+
+
+bool EncryptSecret(const CKeyingMaterial& vMasterKey, const CKeyingMaterial& vchPlaintext, const uint256& nIV, std::vector<unsigned char>& vchCiphertext)
+{
+    CCrypter cKeyCrypter;
+    std::vector<unsigned char> chIV(WALLET_CRYPTO_KEY_SIZE);
+    memcpy(&chIV[0], &nIV, WALLET_CRYPTO_KEY_SIZE);
+    if (!cKeyCrypter.SetKey(vMasterKey, chIV))
+        return false;
+    return cKeyCrypter.Encrypt(*((const CKeyingMaterial*)&vchPlaintext), vchCiphertext);
+}
+
+
+// General secure AES 256 CBC encryption routine
+bool EncryptAES256(const SecureString& sKey, const SecureString& sPlaintext, const std::string& sIV, std::string& sCiphertext)
+{
+    // max ciphertext len for a n bytes of plaintext is
+    // n + AES_BLOCK_SIZE - 1 bytes
+    int nLen = sPlaintext.size();
+    int nCLen = nLen + AES_BLOCK_SIZE;
+    int nFLen = 0;
+
+    // Verify key sizes
+    if (sKey.size() != 32 || sIV.size() != AES_BLOCK_SIZE) {
+        LogPrintf("crypter EncryptAES256 - Invalid key or block size: Key: %d sIV:%d\n", sKey.size(), sIV.size());
+        return false;
+    }
+
+    // Prepare output buffer
+    sCiphertext.resize(nCLen);
+
+    // Perform the encryption
+    EVP_CIPHER_CTX* ctx;
+
+    bool fOk = true;
+
+    ctx = EVP_CIPHER_CTX_new();
+    if (fOk) fOk = EVP_EncryptInit_ex(ctx, EVP_aes_256_cbc(), NULL, (const unsigned char*)&sKey[0], (const unsigned char*)&sIV[0]);
+    if (fOk) fOk = EVP_EncryptUpdate(ctx, (unsigned char*)&sCiphertext[0], &nCLen, (const unsigned char*)&sPlaintext[0], nLen);
+    if (fOk) fOk = EVP_EncryptFinal_ex(ctx, (unsigned char*)(&sCiphertext[0]) + nCLen, &nFLen);
+    EVP_CIPHER_CTX_free(ctx);
+
+    if (!fOk) return false;
+
+    sCiphertext.resize(nCLen + nFLen);
+    return true;
+}
+
+
+bool DecryptSecret(const CKeyingMaterial& vMasterKey, const std::vector<unsigned char>& vchCiphertext, const uint256& nIV, CKeyingMaterial& vchPlaintext)
+{
+    CCrypter cKeyCrypter;
+    std::vector<unsigned char> chIV(WALLET_CRYPTO_KEY_SIZE);
+    memcpy(&chIV[0], &nIV, WALLET_CRYPTO_KEY_SIZE);
+    if (!cKeyCrypter.SetKey(vMasterKey, chIV))
+        return false;
+    return cKeyCrypter.Decrypt(vchCiphertext, *((CKeyingMaterial*)&vchPlaintext));
+}
+
+bool DecryptAES256(const SecureString& sKey, const std::string& sCiphertext, const std::string& sIV, SecureString& sPlaintext)
+{
+    // plaintext will always be equal to or lesser than length of ciphertext
+    int nLen = sCiphertext.size();
+    int nPLen = nLen, nFLen = 0;
+
+    // Verify key sizes
+    if (sKey.size() != 32 || sIV.size() != AES_BLOCK_SIZE) {
+        LogPrintf("crypter DecryptAES256 - Invalid key or block size\n");
+        return false;
+    }
+
+    sPlaintext.resize(nPLen);
+
+    EVP_CIPHER_CTX* ctx;
+
+    bool fOk = true;
+
+    ctx = EVP_CIPHER_CTX_new();
+    if (fOk) fOk = EVP_DecryptInit_ex(ctx, EVP_aes_256_cbc(), NULL, (const unsigned char*)&sKey[0], (const unsigned char*)&sIV[0]);
+    if (fOk) fOk = EVP_DecryptUpdate(ctx, (unsigned char*)&sPlaintext[0], &nPLen, (const unsigned char*)&sCiphertext[0], nLen);
+    if (fOk) fOk = EVP_DecryptFinal_ex(ctx, (unsigned char*)(&sPlaintext[0]) + nPLen, &nFLen);
+    EVP_CIPHER_CTX_free(ctx);
+
+    if (!fOk) return false;
+
+    sPlaintext.resize(nPLen + nFLen);
+    return true;
+}
+
+
+bool CCryptoKeyStore::SetCrypted()
+{
+    LOCK(cs_KeyStore);
+    if (fUseCrypto)
+        return true;
+    if (!mapKeys.empty())
+        return false;
+    fUseCrypto = true;
+    return true;
+}
+
+bool CCryptoKeyStore::Lock()
+{
+    if (!SetCrypted())
+        return false;
+
+    {
+        LOCK(cs_KeyStore);
+        vMasterKey.clear();
+        pwalletMain->zwalletMain->Lock();
+    }
+
+    NotifyStatusChanged(this);
+    return true;
+}
+
+bool CCryptoKeyStore::Unlock(const CKeyingMaterial& vMasterKeyIn)
+{
+    {
+        LOCK(cs_KeyStore);
+        if (!SetCrypted())
+            return false;
+
+        bool keyPass = false;
+        bool keyFail = false;
+        CryptedKeyMap::const_iterator mi = mapCryptedKeys.begin();
+        for (; mi != mapCryptedKeys.end(); ++mi) {
+            const CPubKey& vchPubKey = (*mi).second.first;
+            const std::vector<unsigned char>& vchCryptedSecret = (*mi).second.second;
+            CKeyingMaterial vchSecret;
+            if (!DecryptSecret(vMasterKeyIn, vchCryptedSecret, vchPubKey.GetHash(), vchSecret)) {
+                keyFail = true;
+                break;
+            }
+            if (vchSecret.size() != 32) {
+                keyFail = true;
+                break;
+            }
+            CKey key;
+            key.Set(vchSecret.begin(), vchSecret.end(), vchPubKey.IsCompressed());
+            if (key.GetPubKey() != vchPubKey) {
+                keyFail = true;
+                break;
+            }
+            keyPass = true;
+            if (fDecryptionThoroughlyChecked)
+                break;
+        }
+        if (keyPass && keyFail) {
+            LogPrintf("The wallet is probably corrupted: Some keys decrypt but not all.");
+            assert(false);
+        }
+        if (keyFail || !keyPass)
+            return false;
+        vMasterKey = vMasterKeyIn;
+        fDecryptionThoroughlyChecked = true;
+
+        uint256 hashSeed;
+        if (CWalletDB(pwalletMain->strWalletFile).ReadCurrentSeedHash(hashSeed)) {
+            uint256 nSeed;
+            if (!GetDeterministicSeed(hashSeed, nSeed)) {
+                return error("Failed to read zAGR seed from DB. Wallet is probably corrupt.");
+            }
+            pwalletMain->zwalletMain->SetMasterSeed(nSeed, false);
+        } else {
+            // First time this wallet has been unlocked with dzAGR
+            // Borrow random generator from the key class so that we don't have to worry about randomness
+            CKey key;
+            key.MakeNewKey(true);
+            uint256 seed = key.GetPrivKey_256();
+            LogPrintf("%s: first run of zagr wallet detected, new seed generated. Seedhash=%s\n", __func__, Hash(seed.begin(), seed.end()).GetHex());
+            pwalletMain->zwalletMain->SetMasterSeed(seed, true);
+            pwalletMain->zwalletMain->GenerateMintPool();
+        }
+    }
+
+    NotifyStatusChanged(this);
+    return true;
+}
+
+bool CCryptoKeyStore::AddKeyPubKey(const CKey& key, const CPubKey& pubkey)
+{
+    {
+        LOCK(cs_KeyStore);
+        if (!IsCrypted())
+            return CBasicKeyStore::AddKeyPubKey(key, pubkey);
+
+        if (IsLocked())
+            return false;
+
+        std::vector<unsigned char> vchCryptedSecret;
+        CKeyingMaterial vchSecret(key.begin(), key.end());
+        if (!EncryptSecret(vMasterKey, vchSecret, pubkey.GetHash(), vchCryptedSecret))
+            return false;
+
+        if (!AddCryptedKey(pubkey, vchCryptedSecret))
+            return false;
+    }
+    return true;
+}
+
+
+bool CCryptoKeyStore::AddCryptedKey(const CPubKey& vchPubKey, const std::vector<unsigned char>& vchCryptedSecret)
+{
+    {
+        LOCK(cs_KeyStore);
+        if (!SetCrypted())
+            return false;
+
+        mapCryptedKeys[vchPubKey.GetID()] = make_pair(vchPubKey, vchCryptedSecret);
+    }
+    return true;
+}
+
+bool CCryptoKeyStore::GetKey(const CKeyID& address, CKey& keyOut) const
+{
+    {
+        LOCK(cs_KeyStore);
+        if (!IsCrypted())
+            return CBasicKeyStore::GetKey(address, keyOut);
+
+        CryptedKeyMap::const_iterator mi = mapCryptedKeys.find(address);
+        if (mi != mapCryptedKeys.end()) {
+            const CPubKey& vchPubKey = (*mi).second.first;
+            const std::vector<unsigned char>& vchCryptedSecret = (*mi).second.second;
+            CKeyingMaterial vchSecret;
+            if (!DecryptSecret(vMasterKey, vchCryptedSecret, vchPubKey.GetHash(), vchSecret))
+                return false;
+            if (vchSecret.size() != 32)
+                return false;
+            keyOut.Set(vchSecret.begin(), vchSecret.end(), vchPubKey.IsCompressed());
+            return true;
+        }
+    }
+    return false;
+}
+
+bool CCryptoKeyStore::GetPubKey(const CKeyID& address, CPubKey& vchPubKeyOut) const
+{
+    {
+        LOCK(cs_KeyStore);
+        if (!IsCrypted())
+            return CKeyStore::GetPubKey(address, vchPubKeyOut);
+
+        CryptedKeyMap::const_iterator mi = mapCryptedKeys.find(address);
+        if (mi != mapCryptedKeys.end()) {
+            vchPubKeyOut = (*mi).second.first;
+            return true;
+        }
+    }
+    return false;
+}
+
+bool CCryptoKeyStore::EncryptKeys(CKeyingMaterial& vMasterKeyIn)
+{
+    {
+        LOCK(cs_KeyStore);
+        if (!mapCryptedKeys.empty() || IsCrypted())
+            return false;
+
+        fUseCrypto = true;
+        for (KeyMap::value_type& mKey : mapKeys) {
+            const CKey& key = mKey.second;
+            CPubKey vchPubKey = key.GetPubKey();
+            CKeyingMaterial vchSecret(key.begin(), key.end());
+            std::vector<unsigned char> vchCryptedSecret;
+            if (!EncryptSecret(vMasterKeyIn, vchSecret, vchPubKey.GetHash(), vchCryptedSecret))
+                return false;
+            if (!AddCryptedKey(vchPubKey, vchCryptedSecret))
+                return false;
+        }
+        mapKeys.clear();
+    }
+    return true;
+}
+
+bool CCryptoKeyStore::AddDeterministicSeed(const uint256& seed)
+{
+    CWalletDB db(pwalletMain->strWalletFile);
+    string strErr;
+    uint256 hashSeed = Hash(seed.begin(), seed.end());
+
+    if(IsCrypted()) {
+        if (!IsLocked()) { //if we have password
+
+            CKeyingMaterial kmSeed(seed.begin(), seed.end());
+            vector<unsigned char> vchSeedSecret;
+
+
+            //attempt encrypt
+            if (EncryptSecret(vMasterKey, kmSeed, hashSeed, vchSeedSecret)) {
+                //write to wallet with hashSeed as unique key
+                if (db.WriteZAGRSeed(hashSeed, vchSeedSecret)) {
+                    return true;
+                }
+            }
+            strErr = "encrypt seed";
+        }
+        strErr = "save since wallet is locked";
+    } else { //wallet not encrypted
+        if (db.WriteZAGRSeed(hashSeed, ToByteVector(seed))) {
+            return true;
+        }
+        strErr = "save zagrseed to wallet";
+    }
+                //the use case for this is no password set seed, mint dzAGR,
+
+    return error("s%: Failed to %s\n", __func__, strErr);
+}
+
+bool CCryptoKeyStore::GetDeterministicSeed(const uint256& hashSeed, uint256& seedOut)
+{
+
+    CWalletDB db(pwalletMain->strWalletFile);
+    string strErr;
+    if (IsCrypted()) {
+        if(!IsLocked()) { //if we have password
+
+            vector<unsigned char> vchCryptedSeed;
+            //read encrypted seed
+            if (db.ReadZAGRSeed(hashSeed, vchCryptedSeed)) {
+                uint256 seedRetrieved = uint256(ReverseEndianString(HexStr(vchCryptedSeed)));
+                //this checks if the hash of the seed we just read matches the hash given, meaning it is not encrypted
+                //the use case for this is when not crypted, seed is set, then password set, the seed not yet crypted in memory
+                if(hashSeed == Hash(seedRetrieved.begin(), seedRetrieved.end())) {
+                    seedOut = seedRetrieved;
+                    return true;
+                }
+
+                CKeyingMaterial kmSeed;
+                //attempt decrypt
+                if (DecryptSecret(vMasterKey, vchCryptedSeed, hashSeed, kmSeed)) {
+                    seedOut = uint256(ReverseEndianString(HexStr(kmSeed)));
+                    return true;
+                }
+                strErr = "decrypt seed";
+            } else { strErr = "read seed from wallet"; }
+        } else { strErr = "read seed; wallet is locked"; }
+    } else {
+        vector<unsigned char> vchSeed;
+        // wallet not crypted
+        if (db.ReadZAGRSeed(hashSeed, vchSeed)) {
+            seedOut = uint256(ReverseEndianString(HexStr(vchSeed)));
+            return true;
+        }
+        strErr = "read seed from wallet";
+    }
+
+    return error("%s: Failed to %s\n", __func__, strErr);
+
+
+//    return error("Failed to decrypt deterministic seed %s", IsLocked() ? "Wallet is locked!" : "");
+}