From d084c069be38b6f3ad74912ca629403d9fdaec58 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Roman=20Smr=C5=BE?= <roman.smrz@seznam.cz>
Date: Wed, 11 Dec 2019 22:14:12 +0100
Subject: Identity loading and validation

---
 src/pubkey.cpp | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 src/pubkey.cpp

(limited to 'src/pubkey.cpp')

diff --git a/src/pubkey.cpp b/src/pubkey.cpp
new file mode 100644
index 0000000..3247ce2
--- /dev/null
+++ b/src/pubkey.cpp
@@ -0,0 +1,59 @@
+#include "pubkey.h"
+
+#include <stdexcept>
+
+using std::unique_ptr;
+using std::runtime_error;
+using std::string;
+
+using namespace erebos;
+
+optional<PublicKey> PublicKey::load(const Ref & ref)
+{
+	auto rec = ref->asRecord();
+	if (!rec)
+		return nullopt;
+
+	if (auto ktype = rec->item("type").asText())
+		if (ktype.value() != "ed25519")
+			throw runtime_error("unsupported key type " + ktype.value());
+
+	if (auto pubkey = rec->item("pubkey").asBinary())
+		return PublicKey(EVP_PKEY_new_raw_public_key(EVP_PKEY_ED25519, nullptr,
+					pubkey.value().data(), pubkey.value().size()));
+
+	return nullopt;
+}
+
+optional<Signature> Signature::load(const Ref & ref)
+{
+	auto rec = ref->asRecord();
+	if (!rec)
+		return nullopt;
+
+	auto key = rec->item("key").as<PublicKey>();
+	auto sig = rec->item("sig").asBinary();
+
+	if (!key || !sig)
+		return nullopt;
+
+	return Signature {
+		.key = key.value(),
+		.sig = sig.value(),
+	};
+}
+
+bool Signature::verify(const Ref & ref) const
+{
+	unique_ptr<EVP_MD_CTX, void(*)(EVP_MD_CTX*)>
+		mdctx(EVP_MD_CTX_create(), &EVP_MD_CTX_free);
+	if (!mdctx)
+		throw runtime_error("failed to create EVP_MD_CTX");
+
+	if (EVP_DigestVerifyInit(mdctx.get(), nullptr, EVP_md_null(),
+				nullptr, key->key.get()) != 1)
+		throw runtime_error("failed to initialize EVP_MD_CTX");
+
+	return EVP_DigestVerify(mdctx.get(), sig.data(), sig.size(),
+			ref.digest().arr().data(), Digest::size) == 1;
+}
-- 
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