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wallet: Change CCrypter to use vectors with secure allocator

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Change CCrypter to use vectors with secure allocator instead of buffers
on in the object itself which will end up on the stack. This avoids
having to call LockedPageManager to lock stack memory pages to prevent the
memory from being swapped to disk. This is wasteful.
This commit is contained in:
Wladimir J. van der Laan 2016-09-18 08:23:29 +02:00
parent 97c7f7362f
commit 999e4c91c2
3 changed files with 19 additions and 26 deletions
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14
src/wallet/crypter.cpp
View file

@ -48,12 +48,12 @@ bool CCrypter::SetKeyFromPassphrase(const SecureString& strKeyData, const std::v
int i = 0;
if (nDerivationMethod == 0)
i = BytesToKeySHA512AES(chSalt, strKeyData, nRounds, chKey, chIV);
i = BytesToKeySHA512AES(chSalt, strKeyData, nRounds, vchKey.data(), vchIV.data());
if (i != (int)WALLET_CRYPTO_KEY_SIZE)
{
memory_cleanse(chKey, sizeof(chKey));
memory_cleanse(chIV, sizeof(chIV));
memory_cleanse(vchKey.data(), vchKey.size());
memory_cleanse(vchIV.data(), vchIV.size());
return false;
}
@ -66,8 +66,8 @@ bool CCrypter::SetKey(const CKeyingMaterial& chNewKey, const std::vector<unsigne
if (chNewKey.size() != WALLET_CRYPTO_KEY_SIZE || chNewIV.size() != WALLET_CRYPTO_IV_SIZE)
return false;
memcpy(&chKey[0], &chNewKey[0], sizeof chKey);
memcpy(&chIV[0], &chNewIV[0], sizeof chIV);
memcpy(vchKey.data(), chNewKey.data(), chNewKey.size());
memcpy(vchIV.data(), chNewIV.data(), chNewIV.size());
fKeySet = true;
return true;
@ -82,7 +82,7 @@ bool CCrypter::Encrypt(const CKeyingMaterial& vchPlaintext, std::vector<unsigned
// n + AES_BLOCKSIZE bytes
vchCiphertext.resize(vchPlaintext.size() + AES_BLOCKSIZE);
AES256CBCEncrypt enc(chKey, chIV, true);
AES256CBCEncrypt enc(vchKey.data(), vchIV.data(), true);
size_t nLen = enc.Encrypt(&vchPlaintext[0], vchPlaintext.size(), &vchCiphertext[0]);
if(nLen < vchPlaintext.size())
return false;
@ -101,7 +101,7 @@ bool CCrypter::Decrypt(const std::vector<unsigned char>& vchCiphertext, CKeyingM
vchPlaintext.resize(nLen);
AES256CBCDecrypt dec(chKey, chIV, true);
AES256CBCDecrypt dec(vchKey.data(), vchIV.data(), true);
nLen = dec.Decrypt(&vchCiphertext[0], vchCiphertext.size(), &vchPlaintext[0]);
if(nLen == 0)
return false;

19
src/wallet/crypter.h
View file

@ -77,8 +77,8 @@ class CCrypter
{
friend class wallet_crypto::TestCrypter; // for test access to chKey/chIV
private:
unsigned char chKey[WALLET_CRYPTO_KEY_SIZE];
unsigned char chIV[WALLET_CRYPTO_IV_SIZE];
std::vector<unsigned char, secure_allocator<unsigned char>> vchKey;
std::vector<unsigned char, secure_allocator<unsigned char>> vchIV;
bool fKeySet;
int BytesToKeySHA512AES(const std::vector<unsigned char>& chSalt, const SecureString& strKeyData, int count, unsigned char *key,unsigned char *iv) const;
@ -91,28 +91,21 @@ public:
void CleanKey()
{
memory_cleanse(chKey, sizeof(chKey));
memory_cleanse(chIV, sizeof(chIV));
memory_cleanse(vchKey.data(), vchKey.size());
memory_cleanse(vchIV.data(), vchIV.size());
fKeySet = false;
}
CCrypter()
{
fKeySet = false;
// Try to keep the key data out of swap (and be a bit over-careful to keep the IV that we don't even use out of swap)
// Note that this does nothing about suspend-to-disk (which will put all our key data on disk)
// Note as well that at no point in this program is any attempt made to prevent stealing of keys by reading the memory of the running process.
LockedPageManager::Instance().LockRange(&chKey[0], sizeof chKey);
LockedPageManager::Instance().LockRange(&chIV[0], sizeof chIV);
vchKey.resize(WALLET_CRYPTO_KEY_SIZE);
vchIV.resize(WALLET_CRYPTO_IV_SIZE);
}
~CCrypter()
{
CleanKey();
LockedPageManager::Instance().UnlockRange(&chKey[0], sizeof chKey);
LockedPageManager::Instance().UnlockRange(&chIV[0], sizeof chIV);
}
};

12
src/wallet/test/crypto_tests.cpp
View file

@ -97,10 +97,10 @@ static void TestPassphraseSingle(const std::vector<unsigned char>& vchSalt, cons
OldSetKeyFromPassphrase(passphrase, vchSalt, rounds, 0, chKey, chIV);
BOOST_CHECK_MESSAGE(memcmp(chKey, crypt.chKey, sizeof(chKey)) == 0, \
HexStr(chKey, chKey+sizeof(chKey)) + std::string(" != ") + HexStr(crypt.chKey, crypt.chKey + (sizeof crypt.chKey)));
BOOST_CHECK_MESSAGE(memcmp(chIV, crypt.chIV, sizeof(chIV)) == 0, \
HexStr(chIV, chIV+sizeof(chIV)) + std::string(" != ") + HexStr(crypt.chIV, crypt.chIV + (sizeof crypt.chIV)));
BOOST_CHECK_MESSAGE(memcmp(chKey, crypt.vchKey.data(), crypt.vchKey.size()) == 0, \
HexStr(chKey, chKey+sizeof(chKey)) + std::string(" != ") + HexStr(crypt.vchKey));
BOOST_CHECK_MESSAGE(memcmp(chIV, crypt.vchIV.data(), crypt.vchIV.size()) == 0, \
HexStr(chIV, chIV+sizeof(chIV)) + std::string(" != ") + HexStr(crypt.vchIV));
if(!correctKey.empty())
BOOST_CHECK_MESSAGE(memcmp(chKey, &correctKey[0], sizeof(chKey)) == 0, \
@ -127,7 +127,7 @@ static void TestDecrypt(const CCrypter& crypt, const std::vector<unsigned char>&
CKeyingMaterial vchDecrypted2;
int result1, result2;
result1 = crypt.Decrypt(vchCiphertext, vchDecrypted1);
result2 = OldDecrypt(vchCiphertext, vchDecrypted2, crypt.chKey, crypt.chIV);
result2 = OldDecrypt(vchCiphertext, vchDecrypted2, crypt.vchKey.data(), crypt.vchIV.data());
BOOST_CHECK(result1 == result2);
// These two should be equal. However, OpenSSL 1.0.1j introduced a change
@ -152,7 +152,7 @@ static void TestEncryptSingle(const CCrypter& crypt, const CKeyingMaterial& vchP
std::vector<unsigned char> vchCiphertext2;
int result1 = crypt.Encrypt(vchPlaintext, vchCiphertext1);
int result2 = OldEncrypt(vchPlaintext, vchCiphertext2, crypt.chKey, crypt.chIV);
int result2 = OldEncrypt(vchPlaintext, vchCiphertext2, crypt.vchKey.data(), crypt.vchIV.data());
BOOST_CHECK(result1 == result2);
BOOST_CHECK(vchCiphertext1 == vchCiphertext2);