curl -O -k --cert-type pem --key pubkey.pem \
-d "param1=value1&param2=value2" \
-H "Content-Type: application/x-www-form-urlencoded" \
-X POST url

/*---------------------------------restTemplateKey--------------------------------------------------------*/
    public RestTemplate restTemplateKey(String certName, String certPass) throws Exception{
        InputStream resourceAsStream = new FileInputStream(certName);
        byte[] certAndKey = ByteStreams.toByteArray(resourceAsStream);
        byte[] keyBytes = parseDERFromPEM(certAndKey, "-----BEGIN PUBLIC KEY-----", "-----END PUBLIC KEY-----");

        PublicKey key = generatePublicKeyFromDER(keyBytes);


        KeyStore clientStore = KeyStore.getInstance("JKS");
        clientStore.load(null);
        clientStore.setKeyEntry("key-alias", key, null, null);


        SSLContextBuilder sslContextBuilder = new SSLContextBuilder();
        sslContextBuilder.setProtocol("TLS");

        sslContextBuilder.loadKeyMaterial(clientStore, certPass.toCharArray());
        sslContextBuilder.loadTrustMaterial(new TrustSelfSignedStrategy());

        SSLConnectionSocketFactory sslConnectionSocketFactory = new SSLConnectionSocketFactory(sslContextBuilder.build());
        CloseableHttpClient httpClient = HttpClients.custom()
                .setSSLSocketFactory(sslConnectionSocketFactory)
                .build();
        HttpComponentsClientHttpRequestFactory requestFactory = new HttpComponentsClientHttpRequestFactory(httpClient);
        requestFactory.setConnectTimeout(10000); // 10 seconds
        requestFactory.setReadTimeout(10000); // 10 seconds
        return new RestTemplate(requestFactory);
    }

/*-------------------------------generatePublicKeyFromDER------------------------------------------*/
    private PublicKey generatePublicKeyFromDER(byte[] keyBytes)  throws Exception {

        String modulusBase64 = new String(keyBytes);
        BASE64Decoder b64dec = new BASE64Decoder();
        String exponentBase64 = "65537";
        RSAPublicKeySpec publicKeySpec = new RSAPublicKeySpec(new BigInteger    (1,
                b64dec.decodeBuffer(modulusBase64)),
                new BigInteger(1,b64dec.decodeBuffer(exponentBase64)));

        KeyFactory publicKeyFactory = KeyFactory.getInstance("RSA");

        return publicKeyFactory.generatePublic(publicKeySpec);

    }

/*---------------------------parseDERFromPEM------------------------------------------------------------*/
    private byte[] parseDERFromPEM(byte[] pem, String beginDelimiter, String endDelimiter) {
        String data = new String(pem);
        String[] tokens = data.split(beginDelimiter);
        tokens = tokens[1].split(endDelimiter);
        return DatatypeConverter.parseBase64Binary(tokens[0]);
    }

clientStore.setKeyEntry("key-alias", key, null, null);