111 lines
3.4 KiB
C++
111 lines
3.4 KiB
C++
#include "U2F_Register_APDU.hpp"
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#include <exception>
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#include <cstring>
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#include "micro-ecc/uECC.h"
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#include "Certificates.hpp"
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#include <mbedtls/sha256.h>
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#include <iostream>
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#include "APDU.hpp"
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#include "U2FMessage.hpp"
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#include "u2f.hpp"
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#include "Signature.hpp"
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using namespace std;
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U2F_Register_APDU::U2F_Register_APDU(const U2F_Msg_CMD &msg, const vector<uint8_t> &data)
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: U2F_Msg_CMD{ msg }
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{
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if (data.size() != 64)
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throw runtime_error{ "Incorrect registration size" };
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else if (p1 != 0x00 || p2 != 0x00)
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{
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cerr << "p1: " << static_cast<uint32_t>(p1) << ", p2: " << static_cast<uint32_t>(p2) << endl;
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//throw runtime_error{ "Invalid APDU parameters" };
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}
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copy(data.data() + 0, data.data() + 32, challengeP.begin());
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copy(data.data() + 32, data.data() + 64, appP.begin());
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//Use crypto lib to generate keypair
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Storage::PrivKey privKey{};
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Storage::PubKey pubKey{};
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//Unsure if necessary
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//From github.com/pratikd650/Teensy_U2F/blob/master/Teensy_U2F.cpp
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pubKey[0] = 0x04;
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uECC_make_key(pubKey.data() + 1, privKey.data(), uECC_secp256r1());
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this->keyH = Storage::appParams.size(); //To increment the key handle
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Storage::appParams[this->keyH] = appP;
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Storage::privKeys[this->keyH] = privKey;
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Storage::pubKeys[this->keyH] = pubKey;
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Storage::keyCounts[this->keyH] = 0;
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clog << "Produced pub key: " << hex;
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for (auto b : pubKey)
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clog << static_cast<uint32_t>(b) << ' ';
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clog << endl << dec << "Got U2F_Reg request" << endl;
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}
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void U2F_Register_APDU::respond()
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{
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U2FMessage m{};
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m.cid = 0xF1D0F1D0;
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m.cmd = U2FHID_MSG;
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auto& response = m.data;
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const auto appParam = Storage::appParams[this->keyH];
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const auto pubKey = Storage::pubKeys[this->keyH];
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const auto privKey = Storage::privKeys[this->keyH];
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response.push_back(0x05);
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copy(pubKey.begin(), pubKey.end(), back_inserter(response));
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response.push_back(sizeof(this->keyH));
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auto fakeKeyHBytes = reinterpret_cast<uint8_t *>(&this->keyH);
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copy(fakeKeyHBytes, fakeKeyHBytes + sizeof(this->keyH), back_inserter(response));
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copy(attestCert, end(attestCert), back_inserter(response));
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//Gen signature
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Digest digest;
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{
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mbedtls_sha256_context shaContext;
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mbedtls_sha256_init(&shaContext);
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mbedtls_sha256_starts(&shaContext, 0);
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uint8_t byteReserved = 0;
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mbedtls_sha256_update(&shaContext, reinterpret_cast<unsigned char*>(&byteReserved), 1);
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mbedtls_sha256_update(&shaContext, reinterpret_cast<const unsigned char*>(appParam.data()), appParam.size());
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mbedtls_sha256_update(&shaContext, reinterpret_cast<unsigned char*>(challengeP.data()), challengeP.size());
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mbedtls_sha256_update(&shaContext, reinterpret_cast<unsigned char*>(&keyH), sizeof(keyH));
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mbedtls_sha256_update(&shaContext, reinterpret_cast<const unsigned char*>(pubKey.data()), pubKey.size());
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mbedtls_sha256_finish(&shaContext, digest.data());
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mbedtls_sha256_free(&shaContext);
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}
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Signature signature;
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std::clog << "Will sign digest with priv key" << std::endl;
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uECC_sign(attestPrivKey, digest.data(), digest.size(), signature.data(), uECC_secp256r1());
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//Append signature as DER
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std::clog << "Will append sig as DER" << std::endl;
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appendSignatureAsDER(response, signature);
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response.push_back(static_cast<uint16_t>(APDU_STATUS::SW_NO_ERROR) >> 8);
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response.push_back(static_cast<uint16_t>(APDU_STATUS::SW_NO_ERROR) & 0xff);
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std::clog << "Writing out " << response.size() << " bytes in response" << std::endl;
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m.write();
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}
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