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Verify status of encrypt/decrypt calls to detect failed padding

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This commit is contained in:
Pieter Wuille 2012-04-05 01:02:49 +02:00
parent b0a7e05a45
commit e5c027b49b
2 changed files with 18 additions and 10 deletions
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24
src/crypter.cpp
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@ -73,14 +73,16 @@ bool CCrypter::Encrypt(const CKeyingMaterial& vchPlaintext, std::vector<unsigned
EVP_CIPHER_CTX ctx;
bool fOk = true;
EVP_CIPHER_CTX_init(&ctx);
EVP_EncryptInit_ex(&ctx, EVP_aes_256_cbc(), NULL, chKey, chIV);
EVP_EncryptUpdate(&ctx, &vchCiphertext[0], &nCLen, &vchPlaintext[0], nLen);
EVP_EncryptFinal_ex(&ctx, (&vchCiphertext[0])+nCLen, &nFLen);
if (fOk) fOk = EVP_EncryptInit_ex(&ctx, EVP_aes_256_cbc(), NULL, chKey, chIV);
if (fOk) fOk = EVP_EncryptUpdate(&ctx, &vchCiphertext[0], &nCLen, &vchPlaintext[0], nLen);
if (fOk) fOk = EVP_EncryptFinal_ex(&ctx, (&vchCiphertext[0])+nCLen, &nFLen);
EVP_CIPHER_CTX_cleanup(&ctx);
if (!fOk) return false;
vchCiphertext.resize(nCLen + nFLen);
return true;
}
@ -98,14 +100,16 @@ bool CCrypter::Decrypt(const std::vector<unsigned char>& vchCiphertext, CKeyingM
EVP_CIPHER_CTX ctx;
bool fOk = true;
EVP_CIPHER_CTX_init(&ctx);
EVP_DecryptInit_ex(&ctx, EVP_aes_256_cbc(), NULL, chKey, chIV);
EVP_DecryptUpdate(&ctx, &vchPlaintext[0], &nPLen, &vchCiphertext[0], nLen);
EVP_DecryptFinal_ex(&ctx, (&vchPlaintext[0])+nPLen, &nFLen);
if (fOk) fOk = EVP_DecryptInit_ex(&ctx, EVP_aes_256_cbc(), NULL, chKey, chIV);
if (fOk) fOk = EVP_DecryptUpdate(&ctx, &vchPlaintext[0], &nPLen, &vchCiphertext[0], nLen);
if (fOk) fOk = EVP_DecryptFinal_ex(&ctx, (&vchPlaintext[0])+nPLen, &nFLen);
EVP_CIPHER_CTX_cleanup(&ctx);
if (!fOk) return false;
vchPlaintext.resize(nPLen + nFLen);
return true;
}

4
src/keystore.cpp
View File

@ -84,6 +84,8 @@ bool CCryptoKeyStore::Unlock(const CKeyingMaterial& vMasterKeyIn)
CSecret vchSecret;
if(!DecryptSecret(vMasterKeyIn, vchCryptedSecret, Hash(vchPubKey.begin(), vchPubKey.end()), vchSecret))
return false;
if (vchSecret.size() != 32)
return false;
CKey key;
key.SetPubKey(vchPubKey);
key.SetSecret(vchSecret);
@ -146,6 +148,8 @@ bool CCryptoKeyStore::GetKey(const CBitcoinAddress &address, CKey& keyOut) const
CSecret vchSecret;
if (!DecryptSecret(vMasterKey, vchCryptedSecret, Hash(vchPubKey.begin(), vchPubKey.end()), vchSecret))
return false;
if (vchSecret.size() != 32)
return false;
keyOut.SetPubKey(vchPubKey);
keyOut.SetSecret(vchSecret);
return true;