Adding src/wif/k1.cpp

src/wif/k1.cpp

@@ -0,0 +1,64 @@
+/**
+ * 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 <libeosio/checksum.hpp>
+#include "codec.hpp"
+
+namespace libeosio { namespace internal {
+
+// Just to make it "harder" the calculated checksum for a signature (k1) and pub/priv keys in k1/r1 format.
+// has a suffix that is not present in the WIF encoded string.
+// So this function is a quick hack to calculate it.
+//
+// Should implement and use Init/Update/Finalize hash functions to do it inplace.
+checksum_t _checksum_suffix(const unsigned char *in, size_t size, const char *suffix) {
+	unsigned char buf[size + 2];
+
+	memcpy(buf, in, size);
+	memcpy(buf + size, suffix, 2);
+
+	return checksum_ripemd160(buf, size + 2);
+}
+
+void pub_encoder_k1(const ec_pubkey_t& key, unsigned char *buf) {
+
+	checksum_t check = _checksum_suffix(key.data(), EC_PUBKEY_SIZE, "K1");
+
+	memcpy(buf, key.data(), EC_PUBKEY_SIZE);
+	memcpy(buf + EC_PUBKEY_SIZE, check.data(), check.size());
+}
+
+bool pub_decoder_k1(const std::vector<unsigned char>& buf, ec_pubkey_t& key) {
+
+	checksum_t check = _checksum_suffix(buf.data(), EC_PUBKEY_SIZE, "K1");
+
+	if (memcmp(buf.data() + EC_PUBKEY_SIZE, check.data(), CHECKSUM_SIZE)) {
+		return false;
+	}
+
+	memcpy(key.data(), buf.data(), EC_PUBKEY_SIZE);
+	return true;
+}
+
+}} // namespace libeosio::internal