암호화 : RSA, AES, BASE64

crypt_wrapper.cpp

crypt_wrapper.h

CryptoAPIHelper.cpp

CryptoAPIHelper.h

//  Base64 인코딩

string base64(const string& str)

{

vector<BYTE> binary(str.begin(), str.end());

// get size

DWORD base64_size = 0;

if (!CryptBinaryToStringA(&binary.at(0), binary.size(), CRYPT_STRING_BASE64, NULL, &base64_size))

return "fail to get base64 size";

// encode base64

vector<char> base64(base64_size, 0x00);

if (!CryptBinaryToStringA(&binary.at(0), binary.size(), CRYPT_STRING_BASE64, &base64.at(0), &base64_size))

return "fail to convert base64";

auto it=base64.begin();

while (it!=base64.end()) {

if (*it == 0x0A || *it == 0x0D) { // LFCR(\r\n) 제거

it = base64.erase(it);

} else {

++it;

}

}

string base64_string(&base64.at(0), &base64.at(0) + base64_size);

return base64_string;

}

//  Base64 디코딩

string unbase64(const string& str)

{

DWORD unbase64_flag = 0;

DWORD unbase64_size = 0;

// get size & flag

if (!CryptStringToBinaryA(&str.at(0), str.size(),

CRYPT_STRING_BASE64, NULL, &unbase64_size, NULL, &unbase64_flag))

return "fail to get unbase64 size";

// decode base64

vector<BYTE> unbase64_vec(unbase64_size, 0x00);

if (!CryptStringToBinaryA(&str.at(0), str.size(),

unbase64_flag, &unbase64_vec.at(0), &unbase64_size, NULL, &unbase64_flag))

return "fail to convert unbase64";

string unbase64_string(&unbase64_vec.at(0), &unbase64_vec.at(0) + unbase64_size);

return unbase64_string;

}