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crypter: add tests for crypter
Verify that results correct (match known values), consistent (encrypt->decrypt matches the original), and compatible with the previous openssl implementation. Also check that failed encrypts/decrypts fail the exact same way as openssl.
This commit is contained in:
Cory Fields
Pieter Wuille
parent
0a36b9af28
commit
34ed64a404
@ -94,6 +94,7 @@ BITCOIN_TESTS += \
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wallet/test/wallet_test_fixture.h \
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wallet/test/accounting_tests.cpp \
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wallet/test/wallet_tests.cpp \
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wallet/test/crypto_tests.cpp \
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wallet/test/rpc_wallet_tests.cpp
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endif
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@ -67,9 +67,15 @@ public:
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typedef std::vector<unsigned char, secure_allocator<unsigned char> > CKeyingMaterial;
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namespace wallet_crypto
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{
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class TestCrypter;
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}
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/** Encryption/decryption context with key information */
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class CCrypter
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{
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friend class wallet_crypto::TestCrypter; // for test access to chKey/chIV
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private:
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unsigned char chKey[WALLET_CRYPTO_KEY_SIZE];
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unsigned char chIV[WALLET_CRYPTO_IV_SIZE];
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230
src/wallet/test/crypto_tests.cpp
Normal file
230
src/wallet/test/crypto_tests.cpp
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@ -0,0 +1,230 @@
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// Copyright (c) 2014 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include "random.h"
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#include "utilstrencodings.h"
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#include "test/test_bitcoin.h"
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#include "wallet/crypter.h"
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#include <vector>
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#include <boost/test/unit_test.hpp>
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#include <openssl/aes.h>
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#include <openssl/evp.h>
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BOOST_FIXTURE_TEST_SUITE(wallet_crypto, BasicTestingSetup)
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bool OldSetKeyFromPassphrase(const SecureString& strKeyData, const std::vector<unsigned char>& chSalt, const unsigned int nRounds, const unsigned int nDerivationMethod, unsigned char* chKey, unsigned char* chIV)
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{
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if (nRounds < 1 || chSalt.size() != WALLET_CRYPTO_SALT_SIZE)
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return false;
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int i = 0;
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if (nDerivationMethod == 0)
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i = EVP_BytesToKey(EVP_aes_256_cbc(), EVP_sha512(), &chSalt[0],
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(unsigned char *)&strKeyData[0], strKeyData.size(), nRounds, chKey, chIV);
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if (i != (int)WALLET_CRYPTO_KEY_SIZE)
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{
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memory_cleanse(chKey, sizeof(chKey));
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memory_cleanse(chIV, sizeof(chIV));
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return false;
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}
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return true;
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}
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bool OldEncrypt(const CKeyingMaterial& vchPlaintext, std::vector<unsigned char> &vchCiphertext, const unsigned char chKey[32], const unsigned char chIV[16])
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{
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// max ciphertext len for a n bytes of plaintext is
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// n + AES_BLOCK_SIZE - 1 bytes
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int nLen = vchPlaintext.size();
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int nCLen = nLen + AES_BLOCK_SIZE, nFLen = 0;
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vchCiphertext = std::vector<unsigned char> (nCLen);
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EVP_CIPHER_CTX ctx;
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bool fOk = true;
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EVP_CIPHER_CTX_init(&ctx);
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if (fOk) fOk = EVP_EncryptInit_ex(&ctx, EVP_aes_256_cbc(), NULL, chKey, chIV) != 0;
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if (fOk) fOk = EVP_EncryptUpdate(&ctx, &vchCiphertext[0], &nCLen, &vchPlaintext[0], nLen) != 0;
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if (fOk) fOk = EVP_EncryptFinal_ex(&ctx, (&vchCiphertext[0]) + nCLen, &nFLen) != 0;
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EVP_CIPHER_CTX_cleanup(&ctx);
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if (!fOk) return false;
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vchCiphertext.resize(nCLen + nFLen);
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return true;
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}
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bool OldDecrypt(const std::vector<unsigned char>& vchCiphertext, CKeyingMaterial& vchPlaintext, const unsigned char chKey[32], const unsigned char chIV[16])
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{
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// plaintext will always be equal to or lesser than length of ciphertext
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int nLen = vchCiphertext.size();
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int nPLen = nLen, nFLen = 0;
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vchPlaintext = CKeyingMaterial(nPLen);
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EVP_CIPHER_CTX ctx;
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bool fOk = true;
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EVP_CIPHER_CTX_init(&ctx);
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if (fOk) fOk = EVP_DecryptInit_ex(&ctx, EVP_aes_256_cbc(), NULL, chKey, chIV) != 0;
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if (fOk) fOk = EVP_DecryptUpdate(&ctx, &vchPlaintext[0], &nPLen, &vchCiphertext[0], nLen) != 0;
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if (fOk) fOk = EVP_DecryptFinal_ex(&ctx, (&vchPlaintext[0]) + nPLen, &nFLen) != 0;
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EVP_CIPHER_CTX_cleanup(&ctx);
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if (!fOk) return false;
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vchPlaintext.resize(nPLen + nFLen);
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return true;
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}
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class TestCrypter
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{
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public:
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static void TestPassphraseSingle(const std::vector<unsigned char>& vchSalt, const SecureString& passphrase, uint32_t rounds,
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const std::vector<unsigned char>& correctKey = std::vector<unsigned char>(),
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const std::vector<unsigned char>& correctIV=std::vector<unsigned char>())
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{
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unsigned char chKey[WALLET_CRYPTO_KEY_SIZE];
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unsigned char chIV[WALLET_CRYPTO_IV_SIZE];
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CCrypter crypt;
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crypt.SetKeyFromPassphrase(passphrase, vchSalt, rounds, 0);
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OldSetKeyFromPassphrase(passphrase, vchSalt, rounds, 0, chKey, chIV);
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BOOST_CHECK_MESSAGE(memcmp(chKey, crypt.chKey, sizeof(chKey)) == 0, \
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HexStr(chKey, chKey+sizeof(chKey)) + std::string(" != ") + HexStr(crypt.chKey, crypt.chKey + (sizeof crypt.chKey)));
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BOOST_CHECK_MESSAGE(memcmp(chIV, crypt.chIV, sizeof(chIV)) == 0, \
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HexStr(chIV, chIV+sizeof(chIV)) + std::string(" != ") + HexStr(crypt.chIV, crypt.chIV + (sizeof crypt.chIV)));
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if(!correctKey.empty())
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BOOST_CHECK_MESSAGE(memcmp(chKey, &correctKey[0], sizeof(chKey)) == 0, \
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HexStr(chKey, chKey+sizeof(chKey)) + std::string(" != ") + HexStr(correctKey.begin(), correctKey.end()));
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if(!correctIV.empty())
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BOOST_CHECK_MESSAGE(memcmp(chIV, &correctIV[0], sizeof(chIV)) == 0,
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HexStr(chIV, chIV+sizeof(chIV)) + std::string(" != ") + HexStr(correctIV.begin(), correctIV.end()));
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}
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static void TestPassphrase(const std::vector<unsigned char>& vchSalt, const SecureString& passphrase, uint32_t rounds,
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const std::vector<unsigned char>& correctKey = std::vector<unsigned char>(),
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const std::vector<unsigned char>& correctIV=std::vector<unsigned char>())
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{
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TestPassphraseSingle(vchSalt, passphrase, rounds, correctKey, correctIV);
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for(SecureString::const_iterator i(passphrase.begin()); i != passphrase.end(); ++i)
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TestPassphraseSingle(vchSalt, SecureString(i, passphrase.end()), rounds);
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}
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static void TestDecrypt(const CCrypter& crypt, const std::vector<unsigned char>& vchCiphertext, \
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const std::vector<unsigned char>& vchPlaintext = std::vector<unsigned char>())
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{
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CKeyingMaterial vchDecrypted1;
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CKeyingMaterial vchDecrypted2;
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int result1, result2;
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result1 = crypt.Decrypt(vchCiphertext, vchDecrypted1);
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result2 = OldDecrypt(vchCiphertext, vchDecrypted2, crypt.chKey, crypt.chIV);
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BOOST_CHECK(result1 == result2);
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// These two should be equal. However, OpenSSL 1.0.1j introduced a change
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// that would zero all padding except for the last byte for failed decrypts.
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// This behavior was reverted for 1.0.1k.
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if (vchDecrypted1 != vchDecrypted2 && vchDecrypted1.size() >= AES_BLOCK_SIZE && SSLeay() == 0x100010afL)
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{
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for(CKeyingMaterial::iterator it = vchDecrypted1.end() - AES_BLOCK_SIZE; it != vchDecrypted1.end() - 1; it++)
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*it = 0;
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}
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BOOST_CHECK_MESSAGE(vchDecrypted1 == vchDecrypted2, HexStr(vchDecrypted1.begin(), vchDecrypted1.end()) + " != " + HexStr(vchDecrypted2.begin(), vchDecrypted2.end()));
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if (vchPlaintext.size())
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BOOST_CHECK(CKeyingMaterial(vchPlaintext.begin(), vchPlaintext.end()) == vchDecrypted2);
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}
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static void TestEncryptSingle(const CCrypter& crypt, const CKeyingMaterial& vchPlaintext,
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const std::vector<unsigned char>& vchCiphertextCorrect = std::vector<unsigned char>())
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{
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std::vector<unsigned char> vchCiphertext1;
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std::vector<unsigned char> vchCiphertext2;
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int result1 = crypt.Encrypt(vchPlaintext, vchCiphertext1);
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int result2 = OldEncrypt(vchPlaintext, vchCiphertext2, crypt.chKey, crypt.chIV);
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BOOST_CHECK(result1 == result2);
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BOOST_CHECK(vchCiphertext1 == vchCiphertext2);
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if (!vchCiphertextCorrect.empty())
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BOOST_CHECK(vchCiphertext2 == vchCiphertextCorrect);
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const std::vector<unsigned char> vchPlaintext2(vchPlaintext.begin(), vchPlaintext.end());
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if(vchCiphertext1 == vchCiphertext2)
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TestDecrypt(crypt, vchCiphertext1, vchPlaintext2);
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}
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static void TestEncrypt(const CCrypter& crypt, const std::vector<unsigned char>& vchPlaintextIn, \
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const std::vector<unsigned char>& vchCiphertextCorrect = std::vector<unsigned char>())
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{
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TestEncryptSingle(crypt, CKeyingMaterial(vchPlaintextIn.begin(), vchPlaintextIn.end()), vchCiphertextCorrect);
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for(std::vector<unsigned char>::const_iterator i(vchPlaintextIn.begin()); i != vchPlaintextIn.end(); ++i)
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TestEncryptSingle(crypt, CKeyingMaterial(i, vchPlaintextIn.end()));
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}
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};
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BOOST_AUTO_TEST_CASE(passphrase) {
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// These are expensive.
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TestCrypter::TestPassphrase(ParseHex("0000deadbeef0000"), "test", 25000, \
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ParseHex("fc7aba077ad5f4c3a0988d8daa4810d0d4a0e3bcb53af662998898f33df0556a"), \
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ParseHex("cf2f2691526dd1aa220896fb8bf7c369"));
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std::string hash(GetRandHash().ToString());
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std::vector<unsigned char> vchSalt(8);
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GetRandBytes(&vchSalt[0], vchSalt.size());
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uint32_t rounds = insecure_rand();
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if (rounds > 30000)
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rounds = 30000;
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TestCrypter::TestPassphrase(vchSalt, SecureString(hash.begin(), hash.end()), rounds);
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}
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BOOST_AUTO_TEST_CASE(encrypt) {
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std::vector<unsigned char> vchSalt = ParseHex("0000deadbeef0000");
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BOOST_CHECK(vchSalt.size() == WALLET_CRYPTO_SALT_SIZE);
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CCrypter crypt;
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crypt.SetKeyFromPassphrase("passphrase", vchSalt, 25000, 0);
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TestCrypter::TestEncrypt(crypt, ParseHex("22bcade09ac03ff6386914359cfe885cfeb5f77ff0d670f102f619687453b29d"));
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for (int i = 0; i != 100; i++)
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{
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uint256 hash(GetRandHash());
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TestCrypter::TestEncrypt(crypt, std::vector<unsigned char>(hash.begin(), hash.end()));
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}
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}
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BOOST_AUTO_TEST_CASE(decrypt) {
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std::vector<unsigned char> vchSalt = ParseHex("0000deadbeef0000");
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BOOST_CHECK(vchSalt.size() == WALLET_CRYPTO_SALT_SIZE);
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CCrypter crypt;
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crypt.SetKeyFromPassphrase("passphrase", vchSalt, 25000, 0);
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// Some corner cases the came up while testing
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TestCrypter::TestDecrypt(crypt,ParseHex("795643ce39d736088367822cdc50535ec6f103715e3e48f4f3b1a60a08ef59ca"));
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TestCrypter::TestDecrypt(crypt,ParseHex("de096f4a8f9bd97db012aa9d90d74de8cdea779c3ee8bc7633d8b5d6da703486"));
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TestCrypter::TestDecrypt(crypt,ParseHex("32d0a8974e3afd9c6c3ebf4d66aa4e6419f8c173de25947f98cf8b7ace49449c"));
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TestCrypter::TestDecrypt(crypt,ParseHex("e7c055cca2faa78cb9ac22c9357a90b4778ded9b2cc220a14cea49f931e596ea"));
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TestCrypter::TestDecrypt(crypt,ParseHex("b88efddd668a6801d19516d6830da4ae9811988ccbaf40df8fbb72f3f4d335fd"));
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TestCrypter::TestDecrypt(crypt,ParseHex("8cae76aa6a43694e961ebcb28c8ca8f8540b84153d72865e8561ddd93fa7bfa9"));
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for (int i = 0; i != 100; i++)
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{
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uint256 hash(GetRandHash());
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TestCrypter::TestDecrypt(crypt, std::vector<unsigned char>(hash.begin(), hash.end()));
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}
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}
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BOOST_AUTO_TEST_SUITE_END()
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