Use ImportCertificate with an AWS SDK or CLI

//! Import an AWS Certificate Manager (ACM) certificate.
/*!
  \param certificateFile: Path to certificate to import.
  \param privateKeyFile: Path to file containing a private key.
  \param certificateChainFile: Path to file containing a PEM encoded certificate chain.
  \param clientConfiguration: AWS client configuration.
  \return bool: Function succeeded.
 */
bool AwsDoc::ACM::importCertificate(const Aws::String &certificateFile,
                                    const Aws::String &privateKeyFile,
                                    const Aws::String &certificateChainFile,
                                    const Aws::Client::ClientConfiguration &clientConfiguration) {
    std::ifstream certificateInStream(certificateFile.c_str());
    if (!certificateInStream) {
        std::cerr << "Error: The certificate file '" << certificateFile <<
                  "' does not exist." << std::endl;

        return false;
    }

    std::ifstream privateKeyInstream(privateKeyFile.c_str());
    if (!privateKeyInstream) {
        std::cerr << "Error: The private key file '" << privateKeyFile <<
                  "' does not exist." << std::endl;

        return false;
    }

    std::ifstream certificateChainInStream(certificateChainFile.c_str());
    if (!certificateChainInStream) {
        std::cerr << "Error: The certificate chain file '"
                  << certificateChainFile << "' does not exist." << std::endl;

        return false;
    }

    Aws::String certificate;
    certificate.assign(std::istreambuf_iterator<char>(certificateInStream),
                       std::istreambuf_iterator<char>());

    Aws::String privateKey;
    privateKey.assign(std::istreambuf_iterator<char>(privateKeyInstream),
                      std::istreambuf_iterator<char>());

    Aws::String certificateChain;
    certificateChain.assign(std::istreambuf_iterator<char>(certificateChainInStream),
                            std::istreambuf_iterator<char>());

    Aws::ACM::ACMClient acmClient(clientConfiguration);

    Aws::ACM::Model::ImportCertificateRequest request;

    request.WithCertificate(Aws::Utils::ByteBuffer((unsigned char *)
                                                           certificate.c_str(),
                                                   certificate.size()))
            .WithPrivateKey(Aws::Utils::ByteBuffer((unsigned char *)
                                                           privateKey.c_str(),
                                                   privateKey.size()))
            .WithCertificateChain(Aws::Utils::ByteBuffer((unsigned char *)
                                                                 certificateChain.c_str(),
                                                         certificateChain.size()));

    Aws::ACM::Model::ImportCertificateOutcome outcome =
            acmClient.ImportCertificate(request);

    if (!outcome.IsSuccess()) {
        std::cerr << "Error: ImportCertificate: " <<
                  outcome.GetError().GetMessage() << std::endl;

        return false;
    }
    else {
        std::cout << "Success: Certificate associated with ARN '" <<
                  outcome.GetResult().GetCertificateArn() << "' imported."
                  << std::endl;

        return true;
    }
}

To import a certificate into ACM.

The following import-certificate command imports a certificate into ACM. Replace the file names with your own:

aws acm import-certificate --certificate file://Certificate.pem --certificate-chain file://CertificateChain.pem --private-key file://PrivateKey.pem

/**
 * Before running this Java V2 code example, set up your development
 * environment, including your credentials.
 * <p>
 * For more information, see the following documentation topic:
 * <p>
 * https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/get-started.html
 */
public class ImportCert {

    public static void main(String[] args) {

        final String usage = """

            Usage:    <certificatePath> <privateKeyPath>

            Where:
                certificatePath - the path to the SSL/TLS certificate file.
                privateKeyPath - the path to the private key file associated with the SSL/TLS certificate.
            """;

        if (args.length != 2) {
            System.out.println(usage);
            return;
        }

        String certificatePath = args[0];
        String privateKeyPath = args[1];
        String certificateArn = importCertificate(certificatePath, privateKeyPath);
        System.out.println("Certificate imported with ARN: " + certificateArn);
    }

    /**
     * Imports an SSL/TLS certificate and private key into AWS Certificate Manager (ACM) for use with
     * AWS services.
     *
     * @param certificatePath the file path to the SSL/TLS certificate
     * @param privateKeyPath  the file path to the private key associated with the certificate
     * @throws IOException if there is an error reading the certificate or private key files
     */
    public static String importCertificate(String certificatePath, String privateKeyPath) {
        AcmClient acmClient = AcmClient.create();
        try {
            byte[] certificateBytes = readFileBytes(certificatePath);
            byte[] privateKeyBytes = readFileBytes(privateKeyPath);

            ImportCertificateRequest request = ImportCertificateRequest.builder()
                .certificate(SdkBytes.fromByteBuffer(ByteBuffer.wrap(certificateBytes)))
                .privateKey(SdkBytes.fromByteBuffer(ByteBuffer.wrap(privateKeyBytes)))
                .build();

            ImportCertificateResponse response = acmClient.importCertificate(request);
            String certificateArn = response.certificateArn();
            return certificateArn;
        } catch (IOException e) {
            System.err.println("Error reading certificate or private key file: " + e.getMessage());
        }
        return "";
    }

    private static byte[] readFileBytes(String filePath) throws IOException {
        try (InputStream inputStream = new FileInputStream(filePath)) {
            return IoUtils.toByteArray(inputStream);
        }
    }
}

class AcmCertificate:
    """
    Encapsulates ACM functions.
    """

    def __init__(self, acm_client):
        """
        :param acm_client: A Boto3 ACM client.
        """
        self.acm_client = acm_client


    def import_certificate(self, certificate_body, private_key):
        """
        Imports a self-signed certificate to ACM.

        :param certificate_body: The body of the certificate, in PEM format.
        :param private_key: The unencrypted private key of the certificate, in PEM
                            format.
        :return: The ARN of the imported certificate.
        """
        try:
            response = self.acm_client.import_certificate(
                Certificate=certificate_body, PrivateKey=private_key
            )
            certificate_arn = response["CertificateArn"]
            logger.info("Imported certificate.")
        except ClientError:
            logger.exception("Couldn't import certificate.")
            raise
        else:
            return certificate_arn