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#include <nan.h>
#include <openssl/bio.h>
#include <openssl/buffer.h>
#include <openssl/crypto.h>
#include <openssl/pem.h>
#include <openssl/rsa.h>
#include <openssl/x509.h>
NAN_METHOD(extractPublic)
{
const auto sourceString = info[0]->ToString();
if (!sourceString->IsOneByte()) {
Nan::ThrowError("Malformed character found");
return;
}
size_t sourceLength = sourceString->Length();
const auto sourceBuf = new char[sourceLength];
Nan::DecodeWrite(sourceBuf, sourceLength, sourceString);
const auto source = BIO_new_mem_buf(sourceBuf, sourceLength);
if (source == nullptr) {
Nan::ThrowError("Memory allocation failed");
delete[] sourceBuf;
return;
}
const auto rsa = PEM_read_bio_RSAPrivateKey(source, nullptr, nullptr, nullptr);
BIO_free(source);
delete[] sourceBuf;
if (rsa == nullptr) {
Nan::ThrowError("Decode failed");
return;
}
const auto destination = BIO_new(BIO_s_mem());
if (destination == nullptr) {
Nan::ThrowError("Memory allocation failed");
return;
}
const auto result = PEM_write_bio_RSAPublicKey(destination, rsa);
RSA_free(rsa);
if (result != 1) {
Nan::ThrowError("Public key extraction failed");
BIO_free(destination);
return;
}
char *pem;
const auto pemLength = BIO_get_mem_data(destination, &pem);
info.GetReturnValue().Set(Nan::Encode(pem, pemLength));
BIO_free(destination);
}
NAN_METHOD(generate)
{
const auto exponent = BN_new();
const auto mem = BIO_new(BIO_s_mem());
const auto rsa = RSA_new();
char *data;
long result;
if (exponent == nullptr || mem == nullptr || rsa == nullptr) {
Nan::ThrowError("Memory allocation failed");
goto done;
}
result = BN_set_word(exponent, 65537);
if (result != 1) {
Nan::ThrowError("Exponent setting failed");
goto done;
}
result = RSA_generate_key_ex(rsa, 2048, exponent, nullptr);
if (result != 1) {
Nan::ThrowError("Key generation failed");
goto done;
}
result = PEM_write_bio_RSAPrivateKey(mem, rsa, NULL, NULL, 0, NULL, NULL);
if (result != 1) {
Nan::ThrowError("Key export failed");
goto done;
}
result = BIO_get_mem_data(mem, &data);
info.GetReturnValue().Set(Nan::Encode(data, result));
done:
RSA_free(rsa);
BIO_free(mem);
BN_free(exponent);
}
NAN_MODULE_INIT(InitAll)
{
Nan::Set(target, Nan::New<v8::String>("extractPublic").ToLocalChecked(),
Nan::GetFunction(Nan::New<v8::FunctionTemplate>(extractPublic)).ToLocalChecked());
Nan::Set(target, Nan::New<v8::String>("generate").ToLocalChecked(),
Nan::GetFunction(Nan::New<v8::FunctionTemplate>(generate)).ToLocalChecked());
}
NODE_MODULE(crypto_key, InitAll);
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