使用openssl解密sqlcipher加密的微信FTS5IndexMicroMsg_encrypt.db

bool CFTS5IndexDbResolver::Decrypt(const std::string& dBFile, const std::string& dBPassword, const std::string& DecryptedDbFile)
{
if (dBFile.empty()
|| dBPassword.empty()
|| DecryptedDbFile.empty())
return false;

//std::thread scanThread([dBFile, dBPassword, DecryptedDbFile]() {
int i, csz, tmp_csz, key_sz, iv_sz, block_sz, hmac_sz, reserve_sz, read;
unsigned char* inbuffer, * outbuffer, * salt, * out, * key, * iv;
EVP_CIPHER *evp_cipher;
EVP_CIPHER_CTX ectx;

OpenSSL_add_all_algorithms();
evp_cipher = (EVP_CIPHER*)EVP_get_cipherbyname("aes-256-cbc");
key_sz = EVP_CIPHER_key_length(evp_cipher);
key = (unsigned char*)malloc(key_sz);

iv_sz = EVP_CIPHER_iv_length(evp_cipher);
iv = (unsigned char*)malloc(iv_sz);

hmac_sz = EVP_MD_size(EVP_sha1());
block_sz = EVP_CIPHER_block_size(evp_cipher);

reserve_sz = iv_sz + hmac_sz;
reserve_sz = ((reserve_sz % block_sz) == 0) ? reserve_sz : ((reserve_sz / block_sz) + 1) * block_sz;

inbuffer = (unsigned char*)malloc(DEFAULT_PAGESIZE);
outbuffer = (unsigned char*)malloc(DEFAULT_PAGESIZE);
salt = (unsigned char*)malloc(FILE_HEADER_SZ);