1056184062

Committed 31 Oct 2023 12:41PM UTC coverage: 80.182% (+0.3%) from 79.877%

Build # 1056184062

Build Type

push

gitlab-ci

Committed by

kacf

Commit Message

chore: Do not try to resume requests that were cancelled by callers.

This requires us to move the destruction of the inner reader until
after the body handler has been called, otherwise it will trigger
another `operation_canceled` error which we don't want.

Ticket: MEN-6807

Signed-off-by: Kristian Amlie <kristian.amlie@northern.tech>

Run Details

5 of 5 new or added lines in 1 file covered. (100.0%)

6890 of 8593 relevant lines covered (80.18%)

9363.89 hits per line

Source File
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71.94

/src/common/crypto/platform/openssl/crypto.cpp

// Copyright 2023 Northern.tech AS
//
//    Licensed under the Apache License, Version 2.0 (the "License");
//    you may not use this file except in compliance with the License.
//    You may obtain a copy of the License at
//
//        http://www.apache.org/licenses/LICENSE-2.0
//
//    Unless required by applicable law or agreed to in writing, software
//    distributed under the License is distributed on an "AS IS" BASIS,
//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//    See the License for the specific language governing permissions and
//    limitations under the License.

#include <common/crypto.hpp>

#include <common/crypto/platform/openssl/openssl_config.h>

#include <cstdint>
#include <string>
#include <vector>
#include <memory>


#include <openssl/bn.h>
#include <openssl/ecdsa.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/pem.h>
#include <openssl/rsa.h>

#include <common/io.hpp>
#include <common/error.hpp>
#include <common/expected.hpp>
#include <common/common.hpp>

#include <artifact/sha/sha.hpp>


namespace mender {
namespace common {
namespace crypto {

const size_t MENDER_DIGEST_SHA256_LENGTH = 32;

const size_t OPENSSL_SUCCESS = 1;

using namespace std;

namespace error = mender::common::error;
namespace io = mender::common::io;

auto pkey_ctx_free_func = [](EVP_PKEY_CTX *ctx) {
        if (ctx) {
                EVP_PKEY_CTX_free(ctx);
        }
};
auto pkey_free_func = [](EVP_PKEY *key) {
        if (key) {
                EVP_PKEY_free(key);
        }
};
auto bio_free_func = [](BIO *bio) {
        if (bio) {
                BIO_free(bio);
        }
};
auto bio_free_all_func = [](BIO *bio) {
        if (bio) {
                BIO_free_all(bio);
        }
};
#ifdef MENDER_CRYPTO_OPENSSL_LEGACY
auto bn_free = [](BIGNUM *bn) {
        if (bn) {
                BN_free(bn);
        }
};
#endif

// NOTE: GetOpenSSLErrorMessage should be called upon all OpenSSL errors, as
// the errors are queued, and if not harvested, the FIFO structure of the
// queue will mean that if you just get one, you might actually get the wrong
// one.
string GetOpenSSLErrorMessage() {
        const auto sysErrorCode = errno;
        auto sslErrorCode = ERR_get_error();

        std::string errorDescription {};
        while (sslErrorCode != 0) {
                if (!errorDescription.empty()) {
                        errorDescription += '\n';
                }
                errorDescription += ERR_error_string(sslErrorCode, nullptr);
                sslErrorCode = ERR_get_error();
        }
        if (sysErrorCode != 0) {
                if (!errorDescription.empty()) {
                        errorDescription += '\n';
                }
                errorDescription += "System error, code=" + std::to_string(sysErrorCode);
                errorDescription += ", ";
                errorDescription += strerror(sysErrorCode);
        }
        return errorDescription;
}

ExpectedPrivateKey PrivateKey::LoadFromPEM(
        const string &private_key_path, const string &passphrase) {
        auto private_bio_key = unique_ptr<BIO, void (*)(BIO *)>(
                BIO_new_file(private_key_path.c_str(), "r"), bio_free_func);
        if (private_bio_key == nullptr) {
                return expected::unexpected(MakeError(
                        SetupError,
                        "Failed to open the private key file " + private_key_path + ": "
                                + GetOpenSSLErrorMessage()));
        }

        vector<char> chars(passphrase.begin(), passphrase.end());
        chars.push_back('\0');
        char *c_str = chars.data();

        // We need our own custom callback routine, as the default one will prompt
        // for a passphrase.
        auto callback = [](char *buf, int size, int rwflag, void *u) {
                // We'll only use this callback for reading passphrases, not for
                // writing them.
                assert(rwflag == 0);

                if (u == nullptr) {
                        return 0;
                }

                // NB: buf is not expected to be null terminated.
                char *const pass = static_cast<char *>(u);
                strncpy(buf, pass, size);

                const int len = static_cast<int>(strlen(pass));
                return (len < size) ? len : size;
        };

        auto private_key = unique_ptr<EVP_PKEY, void (*)(EVP_PKEY *)>(
                PEM_read_bio_PrivateKey(private_bio_key.get(), nullptr, callback, c_str), pkey_free_func);
        if (private_key == nullptr) {
                return expected::unexpected(MakeError(
                        SetupError,
                        "Failed to load the key: " + private_key_path + " " + GetOpenSSLErrorMessage()));
        }

        return unique_ptr<PrivateKey>(new PrivateKey(std::move(private_key)));
}

ExpectedPrivateKey PrivateKey::LoadFromPEM(const string &private_key_path) {
        return PrivateKey::LoadFromPEM(private_key_path, "");
}

ExpectedPrivateKey PrivateKey::Generate(const unsigned int bits, const unsigned int exponent) {
#ifdef MENDER_CRYPTO_OPENSSL_LEGACY
        auto pkey_gen_ctx = unique_ptr<EVP_PKEY_CTX, void (*)(EVP_PKEY_CTX *)>(
                EVP_PKEY_CTX_new_id(EVP_PKEY_RSA, nullptr), pkey_ctx_free_func);

        int ret = EVP_PKEY_keygen_init(pkey_gen_ctx.get());
        if (ret != OPENSSL_SUCCESS) {
                return expected::unexpected(MakeError(
                        SetupError,
                        "Failed to generate a private key. Initialization failed: "
                                + GetOpenSSLErrorMessage()));
        }

        ret = EVP_PKEY_CTX_set_rsa_keygen_bits(pkey_gen_ctx.get(), bits);
        if (ret != OPENSSL_SUCCESS) {
                return expected::unexpected(MakeError(
                        SetupError,
                        "Failed to generate a private key. Parameters setting failed: "
                                + GetOpenSSLErrorMessage()));
        }

        auto exponent_bn = unique_ptr<BIGNUM, void (*)(BIGNUM *)>(BN_new(), bn_free);
        ret = BN_set_word(exponent_bn.get(), exponent);
        if (ret != OPENSSL_SUCCESS) {
                return expected::unexpected(MakeError(
                        SetupError,
                        "Failed to generate a private key. Parameters setting failed: "
                                + GetOpenSSLErrorMessage()));
        }

        ret = EVP_PKEY_CTX_set_rsa_keygen_pubexp(pkey_gen_ctx.get(), exponent_bn.get());
        if (ret != OPENSSL_SUCCESS) {
                return expected::unexpected(MakeError(
                        SetupError,
                        "Failed to generate a private key. Parameters setting failed: "
                                + GetOpenSSLErrorMessage()));
        }
        exponent_bn.release();

        EVP_PKEY *pkey = nullptr;
        ret = EVP_PKEY_keygen(pkey_gen_ctx.get(), &pkey);
        if (ret != OPENSSL_SUCCESS) {
                return expected::unexpected(MakeError(
                        SetupError,
                        "Failed to generate a private key. Generation failed: " + GetOpenSSLErrorMessage()));
        }
#else
        auto pkey_gen_ctx = unique_ptr<EVP_PKEY_CTX, void (*)(EVP_PKEY_CTX *)>(
                EVP_PKEY_CTX_new_from_name(nullptr, "RSA", nullptr), pkey_ctx_free_func);

        int ret = EVP_PKEY_keygen_init(pkey_gen_ctx.get());
        if (ret != OPENSSL_SUCCESS) {
                return expected::unexpected(MakeError(
                        SetupError,
                        "Failed to generate a private key. Initialization failed: "
                                + GetOpenSSLErrorMessage()));
        }

        OSSL_PARAM params[3];
        auto bits_buffer = bits;
        auto exponent_buffer = exponent;
        params[0] = OSSL_PARAM_construct_uint("bits", &bits_buffer);
        params[1] = OSSL_PARAM_construct_uint("e", &exponent_buffer);
        params[2] = OSSL_PARAM_construct_end();

        ret = EVP_PKEY_CTX_set_params(pkey_gen_ctx.get(), params);
        if (ret != OPENSSL_SUCCESS) {
                return expected::unexpected(MakeError(
                        SetupError,
                        "Failed to generate a private key. Parameters setting failed: "
                                + GetOpenSSLErrorMessage()));
        }

        EVP_PKEY *pkey = nullptr;
        ret = EVP_PKEY_generate(pkey_gen_ctx.get(), &pkey);
        if (ret != OPENSSL_SUCCESS) {
                return expected::unexpected(MakeError(
                        SetupError,
                        "Failed to generate a private key. Generation failed: " + GetOpenSSLErrorMessage()));
        }
#endif

        auto private_key = unique_ptr<EVP_PKEY, void (*)(EVP_PKEY *)>(pkey, pkey_free_func);
        return unique_ptr<PrivateKey>(new PrivateKey(std::move(private_key)));
}

expected::ExpectedString EncodeBase64(vector<uint8_t> to_encode) {
        // Predict the len of the decoded for later verification. From man page:
        // For every 3 bytes of input provided 4 bytes of output
        // data will be produced. If n is not divisible by 3 (...)
        // the output is padded such that it is always divisible by 4.
        const uint64_t predicted_len {4 * ((to_encode.size() + 2) / 3)};

        // Add space for a NUL terminator. From man page:
        // Additionally a NUL terminator character will be added
        auto buffer {vector<unsigned char>(predicted_len + 1)};

        const int64_t output_len {
                EVP_EncodeBlock(buffer.data(), to_encode.data(), static_cast<int>(to_encode.size()))};
        assert(output_len >= 0);

        if (predicted_len != static_cast<uint64_t>(output_len)) {
                return expected::unexpected(
                        MakeError(Base64Error, "The predicted and the actual length differ"));
        }

        return string(buffer.begin(), buffer.end() - 1); // Remove the last zero byte
}

expected::ExpectedBytes DecodeBase64(string to_decode) {
        // Predict the len of the decoded for later verification. From man page:
        // For every 4 input bytes exactly 3 output bytes will be
        // produced. The output will be padded with 0 bits if necessary
        // to ensure that the output is always 3 bytes.
        const uint64_t predicted_len {3 * ((to_decode.size() + 3) / 4)};

        auto buffer {vector<unsigned char>(predicted_len)};

        const int64_t output_len {EVP_DecodeBlock(
                buffer.data(),
                common::ByteVectorFromString(to_decode).data(),
                static_cast<int>(to_decode.size()))};
        assert(output_len >= 0);

        if (predicted_len != static_cast<uint64_t>(output_len)) {
                return expected::unexpected(MakeError(
                        Base64Error,
                        "The predicted (" + std::to_string(predicted_len) + ") and the actual ("
                                + std::to_string(output_len) + ") length differ"));
        }

        // Subtract padding bytes. Inspired by internal OpenSSL code from:
        // https://github.com/openssl/openssl/blob/ff88545e02ab48a52952350c52013cf765455dd3/crypto/ct/ct_b64.c#L46
        for (auto it = to_decode.crbegin(); *it == '='; it++) {
                buffer.pop_back();
        }

        return buffer;
}


expected::ExpectedString ExtractPublicKey(const string &private_key_path) {
        auto private_bio_key = unique_ptr<BIO, void (*)(BIO *)>(
                BIO_new_file(private_key_path.c_str(), "r"), bio_free_func);

        if (!private_bio_key.get()) {
                return expected::unexpected(MakeError(
                        SetupError,
                        "Failed to open the private key file " + private_key_path + ": "
                                + GetOpenSSLErrorMessage()));
        }

        auto private_key = unique_ptr<EVP_PKEY, void (*)(EVP_PKEY *)>(
                PEM_read_bio_PrivateKey(private_bio_key.get(), nullptr, nullptr, nullptr), pkey_free_func);
        if (private_key == nullptr) {
                return expected::unexpected(MakeError(
                        SetupError,
                        "Failed to load the key (" + private_key_path + "):" + GetOpenSSLErrorMessage()));
        }

        auto bio_public_key = unique_ptr<BIO, void (*)(BIO *)>(BIO_new(BIO_s_mem()), bio_free_all_func);

        if (!bio_public_key.get()) {
                return expected::unexpected(MakeError(
                        SetupError,
                        "Failed to extract the public key from the private key " + private_key_path
                                + "):" + GetOpenSSLErrorMessage()));
        }

        int ret = PEM_write_bio_PUBKEY(bio_public_key.get(), private_key.get());
        if (ret != OPENSSL_SUCCESS) {
                return expected::unexpected(MakeError(
                        SetupError,
                        "Failed to extract the public key from: (" + private_key_path
                                + "): OpenSSL BIO write failed: " + GetOpenSSLErrorMessage()));
        }

        int pending = BIO_ctrl_pending(bio_public_key.get());
        if (pending <= 0) {
                return expected::unexpected(MakeError(
                        SetupError,
                        "Failed to extract the public key from: (" + private_key_path
                                + "): Zero byte key unexpected: " + GetOpenSSLErrorMessage()));
        }

        vector<uint8_t> key_vector(pending);

        size_t read = BIO_read(bio_public_key.get(), key_vector.data(), pending);

        if (read == 0) {
                MakeError(
                        SetupError,
                        "Failed to extract the public key from (" + private_key_path
                                + "): Zero bytes read from BIO: " + GetOpenSSLErrorMessage());
        }

        return string(key_vector.begin(), key_vector.end());
}

expected::ExpectedBytes SignData(const string &private_key_path, const vector<uint8_t> &digest) {
        auto bio_private_key = unique_ptr<BIO, void (*)(BIO *)>(
                BIO_new_file(private_key_path.c_str(), "r"), bio_free_func);
        if (bio_private_key == nullptr) {
                return expected::unexpected(MakeError(
                        SetupError,
                        "Failed to open the private key file (" + private_key_path
                                + "):" + GetOpenSSLErrorMessage()));
        }

        auto pkey = unique_ptr<EVP_PKEY, void (*)(EVP_PKEY *)>(
                PEM_read_bio_PrivateKey(bio_private_key.get(), nullptr, nullptr, nullptr), pkey_free_func);
        if (pkey == nullptr) {
                return expected::unexpected(MakeError(
                        SetupError,
                        "Failed to load the key from (" + private_key_path + "):" + GetOpenSSLErrorMessage()));
        }

        auto pkey_signer_ctx = unique_ptr<EVP_PKEY_CTX, void (*)(EVP_PKEY_CTX *)>(
                EVP_PKEY_CTX_new(pkey.get(), nullptr), pkey_ctx_free_func);

        if (EVP_PKEY_sign_init(pkey_signer_ctx.get()) <= 0) {
                return expected::unexpected(MakeError(
                        SetupError, "Failed to initialize the OpenSSL signer: " + GetOpenSSLErrorMessage()));
        }
        if (EVP_PKEY_CTX_set_signature_md(pkey_signer_ctx.get(), EVP_sha256()) <= 0) {
                return expected::unexpected(MakeError(
                        SetupError,
                        "Failed to set the OpenSSL signature to sha256: " + GetOpenSSLErrorMessage()));
        }

        vector<uint8_t> signature {};

        // Set the needed signature buffer length
        size_t digestlength = MENDER_DIGEST_SHA256_LENGTH, siglength;
        if (EVP_PKEY_sign(pkey_signer_ctx.get(), nullptr, &siglength, digest.data(), digestlength)
                <= 0) {
                return expected::unexpected(MakeError(
                        SetupError, "Failed to get the signature buffer length: " + GetOpenSSLErrorMessage()));
        }
        signature.resize(siglength);

        if (EVP_PKEY_sign(
                        pkey_signer_ctx.get(), signature.data(), &siglength, digest.data(), digestlength)
                <= 0) {
                return expected::unexpected(
                        MakeError(SetupError, "Failed to sign the digest: " + GetOpenSSLErrorMessage()));
        }

        // The signature may in some cases be shorter than the previously allocated
        // length (which is the max)
        signature.resize(siglength);

        return signature;
}

expected::ExpectedString Sign(const string &private_key_path, const mender::sha::SHA &shasum) {
        auto exp_signed_data = SignData(private_key_path, shasum);
        if (!exp_signed_data) {
                return expected::unexpected(exp_signed_data.error());
        }
        vector<uint8_t> signature = exp_signed_data.value();

        return EncodeBase64(signature);
}

expected::ExpectedString SignRawData(
        const string &private_key_path, const vector<uint8_t> &raw_data) {
        auto exp_shasum = mender::sha::Shasum(raw_data);

        if (!exp_shasum) {
                return expected::unexpected(exp_shasum.error());
        }
        auto shasum = exp_shasum.value();
        log::Debug("Shasum is: " + shasum.String());

        return Sign(private_key_path, shasum);
}

const size_t mender_decode_buf_size = 256;
const size_t ecdsa256keySize = 32;

// Try and decode the keys from pure binary, assuming that the points on the
// curve (r,s), have been concatenated together (r || s), and simply dumped to
// binary. Which is what we did in the `mender-artifact` tool.
// (See MEN-1740) for some insight into previous issues, and the chosen fix.
static expected::ExpectedBytes TryASN1EncodeMenderCustomBinaryECFormat(
        const vector<uint8_t> &signature,
        const mender::sha::SHA &shasum,
        std::function<BIGNUM *(const unsigned char *signature, int length, BIGNUM *_unused)>
                BinaryDecoderFn) {
        // Verify that the marshalled keys match our expectation
        const size_t assumed_signature_size {2 * ecdsa256keySize};
        if (signature.size() > assumed_signature_size) {
                return expected::unexpected(MakeError(
                        SetupError,
                        "Unexpected size of the signature for ECDSA. Expected 2*" + to_string(ecdsa256keySize)
                                + " bytes. Got: " + to_string(signature.size())));
        }
        auto ecSig = unique_ptr<ECDSA_SIG, void (*)(ECDSA_SIG *)>(ECDSA_SIG_new(), ECDSA_SIG_free);
        if (ecSig == nullptr) {
                return expected::unexpected(MakeError(
                        SetupError,
                        "Failed to allocate the structure for the ECDSA signature: "
                                + GetOpenSSLErrorMessage()));
        }

        auto r = unique_ptr<BIGNUM, void (*)(BIGNUM *)>(
                BinaryDecoderFn(signature.data(), ecdsa256keySize, NULL /* allocate new memory for r */),
                BN_free);
        if (r == nullptr) {
                return expected::unexpected(MakeError(
                        SetupError,
                        "Failed to extract the r(andom) part from the ECDSA signature in the binary representation: "
                                + GetOpenSSLErrorMessage()));
        }
        auto s = unique_ptr<BIGNUM, void (*)(BIGNUM *)>(
                BinaryDecoderFn(
                        signature.data() + ecdsa256keySize,
                        ecdsa256keySize,
                        NULL /* allocate new memory for s */),
                BN_free);
        if (s == nullptr) {
                return expected::unexpected(MakeError(
                        SetupError,
                        "Failed to extract the s(ignature) part from the ECDSA signature in the binary representation: "
                                + GetOpenSSLErrorMessage()));
        }

        // Set the r&s values in the SIG struct
        // r & s now owned by ecSig
        int ret {ECDSA_SIG_set0(ecSig.get(), r.get(), s.get())};
        if (ret != OPENSSL_SUCCESS) {
                return expected::unexpected(MakeError(
                        SetupError,
                        "Failed to set the signature parts in the ECDSA structure: "
                                + GetOpenSSLErrorMessage()));
        }
        r.release();
        s.release();

        /* Allocate some array guaranteed to hold the DER-encoded structure */
        vector<uint8_t> der_encoded_byte_array(mender_decode_buf_size);
        unsigned char *arr_p = &der_encoded_byte_array[0];
        int len = i2d_ECDSA_SIG(ecSig.get(), &arr_p);
        if (len < 0) {
                return expected::unexpected(MakeError(
                        SetupError,
                        "Failed to set the signature parts in the ECDSA structure: "
                                + GetOpenSSLErrorMessage()));
        }
        /* Resize to the actual size of the DER-encoded signature */
        der_encoded_byte_array.resize(len);

        return der_encoded_byte_array;
}


expected::ExpectedBool VerifySignData(
        const string &public_key_path,
        const mender::sha::SHA &shasum,
        const vector<uint8_t> &signature);

static expected::ExpectedBool VerifyECDSASignData(
        const string &public_key_path,
        const mender::sha::SHA &shasum,
        const vector<uint8_t> &signature) {
        expected::ExpectedBytes exp_der_encoded_signature =
                TryASN1EncodeMenderCustomBinaryECFormat(signature, shasum, BN_bin2bn)
                        .or_else([&signature, &shasum](error::Error big_endian_error) {
                                log::Debug(
                                        "Failed to decode the signature binary blob from our custom binary format assuming the big-endian encoding, error: "
                                        + big_endian_error.String()
                                        + " falling back and trying anew assuming it is little-endian encoded: ");
                                return TryASN1EncodeMenderCustomBinaryECFormat(signature, shasum, BN_lebin2bn);
                        });
        if (!exp_der_encoded_signature) {
                return expected::unexpected(
                        MakeError(VerificationError, exp_der_encoded_signature.error().message));
        }

        vector<uint8_t> der_encoded_signature = exp_der_encoded_signature.value();

        return VerifySignData(public_key_path, shasum, der_encoded_signature);
}

static bool OpenSSLSignatureVerificationError(int a) {
        /*
         * The signature check errored. This is different from the signature being
         * wrong. We simply were not able to perform the check in this instance.
         * Therefore, we fall back to trying the custom marshalled binary ECDSA
         * signature, which we have been using in Mender.
         */
        return a < 0;
}

expected::ExpectedBool VerifySignData(
        const string &public_key_path,
        const mender::sha::SHA &shasum,
        const vector<uint8_t> &signature) {
        auto bio_key =
                unique_ptr<BIO, void (*)(BIO *)>(BIO_new_file(public_key_path.c_str(), "r"), bio_free_func);
        if (bio_key == nullptr) {
                return expected::unexpected(MakeError(
                        SetupError,
                        "Failed to open the public key file from (" + public_key_path
                                + "):" + GetOpenSSLErrorMessage()));
        }

        auto pkey = unique_ptr<EVP_PKEY, void (*)(EVP_PKEY *)>(
                PEM_read_bio_PUBKEY(bio_key.get(), nullptr, nullptr, nullptr), pkey_free_func);
        if (pkey == nullptr) {
                return expected::unexpected(MakeError(
                        SetupError,
                        "Failed to load the public key from(" + public_key_path
                                + "): " + GetOpenSSLErrorMessage()));
        }

        auto pkey_signer_ctx = unique_ptr<EVP_PKEY_CTX, void (*)(EVP_PKEY_CTX *)>(
                EVP_PKEY_CTX_new(pkey.get(), nullptr), pkey_ctx_free_func);

        auto ret = EVP_PKEY_verify_init(pkey_signer_ctx.get());
        if (ret <= 0) {
                return expected::unexpected(MakeError(
                        SetupError, "Failed to initialize the OpenSSL signer: " + GetOpenSSLErrorMessage()));
        }
        ret = EVP_PKEY_CTX_set_signature_md(pkey_signer_ctx.get(), EVP_sha256());
        if (ret <= 0) {
                return expected::unexpected(MakeError(
                        SetupError,
                        "Failed to set the OpenSSL signature to sha256: " + GetOpenSSLErrorMessage()));
        }

        // verify signature
        ret = EVP_PKEY_verify(
                pkey_signer_ctx.get(), signature.data(), signature.size(), shasum.data(), shasum.size());
        if (OpenSSLSignatureVerificationError(ret)) {
                log::Debug(
                        "Failed to verify the signature with the supported OpenSSL binary formats. Falling back to the custom Mender encoded binary format for ECDSA signatures: "
                        + GetOpenSSLErrorMessage());
                return VerifyECDSASignData(public_key_path, shasum, signature);
        }
        if (ret == OPENSSL_SUCCESS) {
                return true;
        }
        /* This is the case where ret == 0. The signature is simply wrong */
        return false;
}

expected::ExpectedBool VerifySign(
        const string &public_key_path, const mender::sha::SHA &shasum, const string &signature) {
        // signature: decode base64
        auto exp_decoded_signature = DecodeBase64(signature);
        if (!exp_decoded_signature) {
                return expected::unexpected(exp_decoded_signature.error());
        }
        auto decoded_signature = exp_decoded_signature.value();

        return VerifySignData(public_key_path, shasum, decoded_signature);
}

error::Error PrivateKey::SaveToPEM(const string &private_key_path) {
        auto bio_key = unique_ptr<BIO, void (*)(BIO *)>(
                BIO_new_file(private_key_path.c_str(), "w"), bio_free_func);
        if (bio_key == nullptr) {
                return MakeError(
                        SetupError,
                        "Failed to open the private key file (" + private_key_path
                                + "): " + GetOpenSSLErrorMessage());
        }

        // PEM_write_bio_PrivateKey_traditional will use the key-specific PKCS1
        // format if one is available for that key type, otherwise it will encode
        // to a PKCS8 key.
        auto ret = PEM_write_bio_PrivateKey_traditional(
                bio_key.get(), key.get(), nullptr, nullptr, 0, nullptr, nullptr);
        if (ret != OPENSSL_SUCCESS) {
                return MakeError(
                        SetupError,
                        "Failed to save the private key to file (" + private_key_path
                                + "): " + GetOpenSSLErrorMessage());
        }

        return error::NoError;
}

} // namespace crypto
} // namespace common
} // namespace mender

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