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.h | 87 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 src/pubkey.h

(limited to 'src/pubkey.h')

diff --git a/src/pubkey.h b/src/pubkey.h
new file mode 100644
index 0000000..7fe37ec
--- /dev/null
+++ b/src/pubkey.h
@@ -0,0 +1,87 @@
+#pragma once
+
+#include "storage.h"
+
+#include <openssl/evp.h>
+
+using std::nullopt;
+using std::optional;
+using std::shared_ptr;
+
+namespace erebos {
+
+class PublicKey
+{
+	PublicKey(EVP_PKEY * key):
+		key(key, EVP_PKEY_free) {}
+public:
+	static optional<PublicKey> load(const Ref &);
+	const shared_ptr<EVP_PKEY> key;
+};
+
+class SecretKey
+{
+	SecretKey(EVP_PKEY * key, const Stored<PublicKey> & pub):
+		key(key, EVP_PKEY_free), pub(pub) {}
+
+private:
+	const shared_ptr<EVP_PKEY> key;
+	Stored<PublicKey> pub;
+};
+
+class Signature
+{
+public:
+	static optional<Signature> load(const Ref &);
+
+	bool verify(const Ref &) const;
+
+	Stored<PublicKey> key;
+	vector<uint8_t> sig;
+};
+
+template<typename T>
+class Signed
+{
+public:
+	static optional<Signed<T>> load(const Ref &);
+
+	bool isSignedBy(const Stored<PublicKey> &) const;
+
+	const Stored<T> data;
+	const vector<Stored<Signature>> sigs;
+};
+
+template<typename T>
+optional<Signed<T>> Signed<T>::load(const Ref & ref)
+{
+	auto rec = ref->asRecord();
+	if (!rec)
+		return nullopt;
+
+	auto data = rec->item("SDATA").as<T>();
+	if (!data)
+		return nullopt;
+
+	vector<Stored<Signature>> sigs;
+	for (auto item : rec->items("sig"))
+		if (auto sig = item.as<Signature>())
+			if (sig.value()->verify(data.value().ref))
+				sigs.push_back(sig.value());
+
+	return Signed {
+		.data = data.value(),
+		.sigs = sigs,
+	};
+}
+
+template<typename T>
+bool Signed<T>::isSignedBy(const Stored<PublicKey> & key) const
+{
+	for (const auto & sig : sigs)
+		if (sig->key == key)
+			return true;
+	return false;
+}
+
+}
-- 
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