Adding src/libsecp256k1/ec.cpp

src/libsecp256k1/ec.cpp

@@ -0,0 +1,84 @@
+/**
+ * MIT License
+ *
+ * Copyright (c) 2019-2021 EOS Sw/eden
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include <secp256k1.h>
+#include <secp256k1_ecdh.h>
+#include <libeosio/ec.hpp>
+#include "rng.h"
+
+namespace libeosio {
+
+secp256k1_context* ctx;
+
+int ec_init() {
+	ctx = secp256k1_context_create(SECP256K1_CONTEXT_NONE);
+	return ctx == NULL ? -1 : 0;
+}
+
+void ec_shutdown() {
+	if (ctx) {
+		secp256k1_context_destroy(ctx);
+		ctx = NULL;
+	}
+}
+
+int ec_generate_key(struct ec_keypair *pair) {
+
+	int ret = -1;
+	size_t len;
+	secp256k1_pubkey pub;
+	unsigned char seckey[32];
+	unsigned char randomize[32];
+
+	if (!fill_random(randomize, sizeof(randomize))) {
+		return -1;
+	}
+
+	if (secp256k1_context_randomize(ctx, randomize) < 0) {
+		return -1;
+	}
+
+	while (1) {
+		if (!fill_random(pair->secret.data(), pair->secret.size())) {
+			return -1;
+		}
+		if (secp256k1_ec_seckey_verify(ctx, pair->secret.data())) {
+			break;
+		}
+	}
+
+	if (secp256k1_ec_pubkey_create(ctx, &pub, pair->secret.data()) < 0) {
+		return -1;
+	}
+
+	len = EC_PUBKEY_SIZE;
+	secp256k1_ec_pubkey_serialize(ctx, pair->pub.data(), &len, &pub, SECP256K1_EC_COMPRESSED);
+
+	if (len != EC_PUBKEY_SIZE) {
+		return -1;
+	}
+
+	return ret;
+}
+
+} // namespace libeosio