mirror of
https://github.com/arun11299/cpp-jwt.git
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307 lines
7.3 KiB
C++
307 lines
7.3 KiB
C++
#ifndef CPP_JWT_ALGORITHM_IPP
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#define CPP_JWT_ALGORITHM_IPP
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namespace jwt {
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template <typename Hasher>
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verify_result_t HMACSign<Hasher>::verify(
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const string_view key,
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const string_view head,
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const string_view jwt_sign)
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{
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std::error_code ec{};
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BIO_uptr b64{BIO_new(BIO_f_base64()), bio_deletor};
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if (!b64) {
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throw MemoryAllocationException("BIO_new failed");
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}
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BIO* bmem = BIO_new(BIO_s_mem());
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if (!bmem) {
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throw MemoryAllocationException("BIO_new failed");
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}
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BIO_push(b64.get(), bmem);
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BIO_set_flags(b64.get(), BIO_FLAGS_BASE64_NO_NL);
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unsigned char enc_buf[EVP_MAX_MD_SIZE];
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uint32_t enc_buf_len = 0;
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unsigned char* res = HMAC(Hasher{}(),
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key.data(),
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key.length(),
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reinterpret_cast<const unsigned char*>(head.data()),
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head.length(),
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enc_buf,
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&enc_buf_len);
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if (!res) {
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ec = AlgorithmErrc::VerificationErr;
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return {false, ec};
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}
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BIO_write(b64.get(), enc_buf, enc_buf_len);
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(void)BIO_flush(b64.get());
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int len = BIO_pending(bmem);
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if (len < 0) {
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ec = AlgorithmErrc::VerificationErr;
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return {false, ec};
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}
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std::string cbuf;
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cbuf.resize(len + 1);
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len = BIO_read(bmem, &cbuf[0], len);
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cbuf.resize(len);
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//Make the base64 string url safe
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auto new_len = jwt::base64_uri_encode(&cbuf[0], cbuf.length());
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cbuf.resize(new_len);
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bool ret = (string_view{cbuf} == jwt_sign);
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return { ret, ec };
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}
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template <typename Hasher>
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verify_result_t PEMSign<Hasher>::verify(
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const string_view key,
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const string_view head,
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const string_view jwt_sign)
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{
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std::error_code ec{};
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std::string dec_sig = base64_uri_decode(jwt_sign.data(), jwt_sign.length());
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BIO_uptr bufkey{
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BIO_new_mem_buf((void*)key.data(), key.length()),
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bio_deletor};
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if (!bufkey) {
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throw MemoryAllocationException("BIO_new_mem_buf failed");
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}
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EC_PKEY_uptr pkey{
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PEM_read_bio_PUBKEY(bufkey.get(), nullptr, nullptr, nullptr),
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ev_pkey_deletor};
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if (!pkey) {
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ec = AlgorithmErrc::VerificationErr;
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return { false, ec };
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}
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int pkey_type = EVP_PKEY_id(pkey.get());
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if (pkey_type != Hasher::type) {
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ec = AlgorithmErrc::VerificationErr;
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return { false, ec };
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}
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//Convert EC signature back to ASN1
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if (Hasher::type == EVP_PKEY_EC) {
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EC_SIG_uptr ec_sig{ECDSA_SIG_new(), ec_sig_deletor};
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if (!ec_sig) {
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throw MemoryAllocationException("ECDSA_SIG_new failed");
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}
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//Get the actual ec_key
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EC_KEY_uptr ec_key{EVP_PKEY_get1_EC_KEY(pkey.get()), ec_key_deletor};
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if (!ec_key) {
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throw MemoryAllocationException("EVP_PKEY_get1_EC_KEY failed");
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}
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unsigned int degree = EC_GROUP_get_degree(
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EC_KEY_get0_group(ec_key.get()));
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unsigned int bn_len = (degree + 7) / 8;
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if ((bn_len * 2) != dec_sig.length()) {
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ec = AlgorithmErrc::VerificationErr;
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return { false, ec };
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}
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BIGNUM* ec_sig_r = BN_bin2bn((unsigned char*)dec_sig.data(), bn_len, nullptr);
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BIGNUM* ec_sig_s = BN_bin2bn((unsigned char*)dec_sig.data() + bn_len, bn_len, nullptr);
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if (!ec_sig_r || !ec_sig_s) {
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ec = AlgorithmErrc::VerificationErr;
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return { false, ec };
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}
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ECDSA_SIG_set0(ec_sig.get(), ec_sig_r, ec_sig_s);
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size_t nlen = i2d_ECDSA_SIG(ec_sig.get(), nullptr);
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dec_sig.resize(nlen);
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auto data = reinterpret_cast<unsigned char*>(&dec_sig[0]);
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nlen = i2d_ECDSA_SIG(ec_sig.get(), &data);
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if (nlen == 0) {
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ec = AlgorithmErrc::VerificationErr;
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return { false, ec };
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}
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}
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EVP_MDCTX_uptr mdctx_ptr{EVP_MD_CTX_create(), evp_md_ctx_deletor};
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if (!mdctx_ptr) {
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throw MemoryAllocationException("EVP_MD_CTX_create failed");
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}
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if (EVP_DigestVerifyInit(
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mdctx_ptr.get(), nullptr, Hasher{}(), nullptr, pkey.get()) != 1) {
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ec = AlgorithmErrc::VerificationErr;
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return { false, ec };
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}
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if (EVP_DigestVerifyUpdate(mdctx_ptr.get(), head.data(), head.length()) != 1) {
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ec = AlgorithmErrc::VerificationErr;
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return { false, ec };
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}
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if (EVP_DigestVerifyFinal(
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mdctx_ptr.get(), (unsigned char*)&dec_sig[0], dec_sig.length()) != 1) {
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ec = AlgorithmErrc::VerificationErr;
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return { false, ec };
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}
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return { true, ec };
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}
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template <typename Hasher>
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EVP_PKEY* PEMSign<Hasher>::load_key(
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const string_view key,
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std::error_code& ec)
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{
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ec.clear();
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BIO_uptr bio_ptr{
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BIO_new_mem_buf((void*)key.data(), key.length()),
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bio_deletor};
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if (!bio_ptr) {
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throw MemoryAllocationException("BIO_new_mem_buf failed");
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}
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EVP_PKEY* pkey = PEM_read_bio_PrivateKey(
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bio_ptr.get(), nullptr, nullptr, nullptr);
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if (!pkey) {
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ec = AlgorithmErrc::SigningErr;
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return nullptr;
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}
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auto pkey_type = EVP_PKEY_id(pkey);
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if (pkey_type != Hasher::type) {
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ec = AlgorithmErrc::SigningErr;
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return nullptr;
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}
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return pkey;
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}
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template <typename Hasher>
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std::string PEMSign<Hasher>::evp_digest(
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EVP_PKEY* pkey,
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const string_view data,
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std::error_code& ec)
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{
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ec.clear();
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EVP_MDCTX_uptr mdctx_ptr{EVP_MD_CTX_create(), evp_md_ctx_deletor};
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if (!mdctx_ptr) {
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throw MemoryAllocationException("EVP_MD_CTX_create failed");
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}
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//Initialiaze the digest algorithm
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if (EVP_DigestSignInit(
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mdctx_ptr.get(), nullptr, Hasher{}(), nullptr, pkey) != 1) {
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ec = AlgorithmErrc::SigningErr;
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return {};
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}
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//Update the digest with the input data
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if (EVP_DigestSignUpdate(mdctx_ptr.get(), data.data(), data.length()) != 1) {
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ec = AlgorithmErrc::SigningErr;
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return {};
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}
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unsigned long len = 0;
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if (EVP_DigestSignFinal(mdctx_ptr.get(), nullptr, &len) != 1) {
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ec = AlgorithmErrc::SigningErr;
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return {};
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}
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std::string sign;
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sign.resize(len);
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//Get the signature
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if (EVP_DigestSignFinal(mdctx_ptr.get(), (unsigned char*)&sign[0], &len) != 1) {
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ec = AlgorithmErrc::SigningErr;
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return {};
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}
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return sign;
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}
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template <typename Hasher>
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std::string PEMSign<Hasher>::public_key_ser(
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EVP_PKEY* pkey,
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string_view sign,
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std::error_code& ec)
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{
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// Get the EC_KEY representing a public key and
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// (optionaly) an associated private key
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std::string new_sign;
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ec.clear();
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EC_KEY_uptr ec_key{EVP_PKEY_get1_EC_KEY(pkey), ec_key_deletor};
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if (!ec_key) {
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ec = AlgorithmErrc::SigningErr;
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return {};
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}
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uint32_t degree = EC_GROUP_get_degree(EC_KEY_get0_group(ec_key.get()));
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ec_key.reset(nullptr);
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auto char_ptr = &sign[0];
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EC_SIG_uptr ec_sig{d2i_ECDSA_SIG(nullptr,
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(const unsigned char**)&char_ptr,
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sign.length()),
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ec_sig_deletor};
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if (!ec_sig) {
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ec = AlgorithmErrc::SigningErr;
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return {};
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}
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const BIGNUM* ec_sig_r = nullptr;
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const BIGNUM* ec_sig_s = nullptr;
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ECDSA_SIG_get0(ec_sig.get(), &ec_sig_r, &ec_sig_s);
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auto r_len = BN_num_bytes(ec_sig_r);
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auto s_len = BN_num_bytes(ec_sig_s);
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auto bn_len = (degree + 7) / 8;
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if ((r_len > bn_len) || (s_len > bn_len)) {
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ec = AlgorithmErrc::SigningErr;
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return {};
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}
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auto buf_len = 2 * bn_len;
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new_sign.resize(buf_len);
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BN_bn2bin(ec_sig_r, (unsigned char*)&new_sign[0] + bn_len - r_len);
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BN_bn2bin(ec_sig_s, (unsigned char*)&new_sign[0] + buf_len - s_len);
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return new_sign;
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}
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} // END namespace jwt
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#endif
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