105 lines
2.1 KiB
C++
105 lines
2.1 KiB
C++
#include "receiver.h"
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#include <sodium.h>
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#include "json.hpp"
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#include "expiring_signature.h"
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#include "sodium_helpers.h"
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#include "string_helpers.h"
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#include "time_helpers.h"
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namespace BareMinimumCrypto::Receiver {
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using nlohmann::json;
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bool is_pubkey_length (const Bytes & v) {
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return v.size () == crypto_sign_PUBLICKEYBYTES;
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}
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optional <Bytes> try_verify_signed_data (
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const Bytes & pubkey,
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const ExpiringSignature & sig,
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Instant now
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) {
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try_sodium_init ();
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if (! is_pubkey_length (pubkey)) {
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return nullopt;
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}
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if (crypto_sign_verify_detached (
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sig.sig.data (),
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sig.cert.data (),
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sig.cert.size (),
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pubkey.data ()
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) != 0) {
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return nullopt;
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}
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const json j = json::from_msgpack (sig.cert);
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const TimeRange tr {
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j ["not_before"],
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j ["not_after"]
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};
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if (! tr.contains (now)) {
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return nullopt;
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}
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const auto payload = j ["payload"].get_binary ();
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return payload;
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}
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optional <Bytes> verify_signed_data (
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const Bytes & pubkey,
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const ExpiringSignature & sig,
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Instant now
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) {
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try {
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return try_verify_signed_data (pubkey, sig, now);
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}
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catch (json::exception &) {
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return nullopt;
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}
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}
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optional <Bytes> try_verify_cert_and_data (
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const Bytes & root_pubkey,
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const Bytes & msgpack,
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Instant now
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) {
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const auto j = json::from_msgpack (msgpack);
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ExpiringSignature cert;
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cert.sig = j ["cert"]["sig"].get_binary ();
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cert.cert = j ["cert"]["cert"].get_binary ();
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auto subkey_opt = verify_signed_data (root_pubkey, cert, now);
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const auto subkey_obj = json::from_msgpack (std::move (*subkey_opt));
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const auto subkey = subkey_obj ["key"].get_binary ();
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ExpiringSignature data;
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data.sig = j ["data"]["sig"].get_binary ();
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data.cert = j ["data"]["cert"].get_binary ();
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return verify_signed_data (subkey, data, now);
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}
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optional <Bytes> verify_cert_and_data (
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const Bytes & root_pubkey,
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const Bytes & msgpack
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) {
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try {
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return try_verify_cert_and_data (root_pubkey, msgpack, Instant::now ());
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}
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catch (json::exception &) {
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return nullopt;
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}
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}
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}
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