RSCrypto/PairKey.cpp at master · rsobies/RSCrypto · GitHub

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#include "pch.h"
#include "PairKey.h"
#include <openssl/pem.h>


PairKey::PairKey(Key_t type)
{
	int ret = -1;
	switch (type) {
		case Key_t::EC_key:
		{
			auto eckey = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
			assert(1 == EC_KEY_generate_key(eckey));
			assert(1 == EC_KEY_check_key(eckey));
			assert(1 == EVP_PKEY_assign_EC_KEY(evp_ptr.get(), eckey));

			break;
		}
		default:
		{
			auto rsa = RSA_new();

			uniqeBignum bn_ptr(BN_new(), BIGNUMDeleter());

			assert(1 == BN_set_word(bn_ptr.get(), RSA_F4));

			assert(1 == RSA_generate_key_ex(rsa, 2048, bn_ptr.get(), nullptr));

			assert(1 == EVP_PKEY_assign_RSA(evp_ptr.get(), rsa));

		}
	}

	bPrivate = true;
}

bool PairKey::savePublicKey(const string& filename) const
{
	auto bio_ptr = newBIO(filename.c_str(), "w+");

	return PEM_write_bio_PUBKEY(bio_ptr.get(), evp_ptr.get());
}

bool PairKey::savePrivateKey(const string& filename) const
{
	uniqeBIO bio_ptr = newBIO(filename.c_str(), "w+");
	return PEM_write_bio_PrivateKey(bio_ptr.get(), evp_ptr.get(), nullptr, nullptr, 0, nullptr, nullptr);
}

bool PairKey::readPublicKey(const string& filename)
{
	uniqeBIO bio_ptr = newBIO(filename, "r");

	evp_ptr = uniqeEVP{ PEM_read_bio_PUBKEY(bio_ptr.get(), nullptr, nullptr, nullptr), EVPDeleter() };
	bPrivate = false;
	return evp_ptr != nullptr;
}

bool PairKey::readPrivate(const string& filename)
{
	uniqeBIO bio_ptr = newBIO(filename, "r");

	if (bio_ptr == nullptr) {
		return false;
	}

	return readPrivate(move(bio_ptr));
}

bool PairKey::isPrivate() const
{
	return bPrivate;
}

Key_t PairKey::getType() const
{
	if (evp_ptr == nullptr) {
		return Key_t::UNK;
	}

	switch (auto typeId = EVP_PKEY_base_id(evp_ptr.get())) {
	case EVP_PKEY_RSA:
		return Key_t::RSA_key;
	case EVP_PKEY_EC:
		return Key_t::EC_key;
	default:
		return Key_t::UNK;
	}
}

vector<unsigned char> PairKey::sign(const vector<unsigned char>& msg) const
{
	const int sha256Len = 32;
	unsigned char sha[sha256Len];

	SHA256(&(msg[0]), msg.size(), sha);
	auto evpctx_ptr = newEVPCTX(evp_ptr);

	assert(1 == EVP_PKEY_sign_init(evpctx_ptr.get()));

	assert(1 == EVP_PKEY_CTX_set_signature_md(evpctx_ptr.get(), EVP_sha256()));

	size_t signLen = 0;
	assert(1 == EVP_PKEY_sign(evpctx_ptr.get(), NULL, &signLen, sha, sha256Len));

	vector<unsigned char> sig(signLen);

	auto ret = EVP_PKEY_sign(evpctx_ptr.get(), &(sig[0]), &signLen, sha, sha256Len);

	if (ret != 1) {
		return vector<unsigned char>(0);
	}

	if (signLen != sig.size()) {
		sig.resize(signLen);
	}

	return sig;
}

bool PairKey::verifySign(const vector<unsigned char>& sign, const vector<unsigned char>& msg) const
{
	const int sha256Len = 32;
	unsigned char sha[sha256Len];

	SHA256(&(msg[0]), msg.size(), sha);
	auto evpctx_ptr = newEVPCTX(evp_ptr);

	assert(1 == EVP_PKEY_verify_init(evpctx_ptr.get()));

	assert(1 == EVP_PKEY_CTX_set_signature_md(evpctx_ptr.get(), EVP_sha256()));

	auto ret = EVP_PKEY_verify(evpctx_ptr.get(), &sign[0], sign.size(), sha, sha256Len);
	assert(ret != -2);
	return ret == 1;
}

bool PairKey::readPrivate(uniqeBIO bioPtr)
{
	evp_ptr = uniqeEVP{ PEM_read_bio_PrivateKey(bioPtr.get(), nullptr,nullptr, nullptr), EVPDeleter() };

	bPrivate = evp_ptr != nullptr ? true : bPrivate;
	return evp_ptr != nullptr;
}

bool PairKey::parsePrivate(const string& privateKey) {

	auto bio_ptr = uniqeBIO{ BIO_new(BIO_s_mem()) , BIODeleter() };

	if (bio_ptr == nullptr) {
		return false;
	}

	assert(-1 != BIO_printf(bio_ptr.get(), "%s", privateKey.c_str()));

	return readPrivate(move(bio_ptr));
}

const uniqeEVP& PairKey::getEVP() const
{
	return evp_ptr;
}

bool PairKey::parsePublic(const string& publicKey)
{
	auto bio_ptr = uniqeBIO{ BIO_new(BIO_s_mem()) , BIODeleter() };

	if (bio_ptr == nullptr) {
		return false;
	}

	assert(-1 != BIO_printf(bio_ptr.get(), "%s", publicKey.c_str()));

	evp_ptr = uniqeEVP{ PEM_read_bio_PUBKEY(bio_ptr.get(), nullptr, nullptr, nullptr), EVPDeleter() };
	bPrivate = false;
	return evp_ptr != nullptr;
}