Add keypair to local account

src/crypto_key.cc

@@ -0,0 +1,111 @@
+#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);