JDK8的JCE是不支持讀取PEM文件的。需要使用bouncycastle。

項目需求，使用SHA1WithRSA算法，對接口數據做簽名。

代碼如下：

@Serviceclass SignService { private static Logger LOG = LoggerFactory.getLogger(SignService.class); @Autowired private Config config; private Signature signature; @PostConstruct private void init() { try { PKCS8EncodedKeySpec priKeySpec = new PKCS8EncodedKeySpec( getDecoder().decode(config.getPrivateKey().getBytes(ISO_8859_1))); KeyFactory factory = KeyFactory.getInstance('RSA'); PrivateKey privateKey = factory.generatePrivate(priKeySpec); signature = Signature.getInstance('SHA1WithRSA'); signature.initSign(privateKey); } catch (NoSuchAlgorithmException | /*InvalidAlgorithmParameterException |*/ InvalidKeySpecException | InvalidKeyException ex) { LOG.warn('RSA init error: {}.', ex); } } String signAndEncode(String source) { if (Objects.isNull(source)) { return null; } else { return sign(source) .map(this::encode) .orElse(''); } } private String encode(byte[] source) { return getEncoder() .encodeToString(source); } private synchronized Optional<byte[]> sign(String source) { try { signature.update(source.getBytes(ISO_8859_1)); return Optional.of(signature.sign()); } catch (SignatureException e) { LOG.warn('SHA1WithRSA {} error: {}.', source, e); return Optional.empty(); } }}

單元測試，驗證簽名是否正確。先初始化Signature：

private Signature signature; @Before public void init() { try { byte[] key = Files.readAllBytes(Paths.get('/home/ls', 'ras_public_key.pem')); Security.addProvider(new BouncyCastleProvider()); final PemObject pemObject; try (PemReader pemReader = new PemReader(new InputStreamReader( new ByteArrayInputStream(key)))) { pemObject = pemReader.readPemObject(); } X509EncodedKeySpec pubKeySpec = new X509EncodedKeySpec(pemObject.getContent()); KeyFactory factory = KeyFactory.getInstance('RSA'); PublicKey publicKey = factory.generatePublic(pubKeySpec); signature = Signature.getInstance('SHA1WithRSA'); signature.initVerify(publicKey); } catch (Exception e) { e.printStackTrace(); } }

驗證方法

private boolean verify(String source, String sign) { byte[] data = getDecoder().decode(sign); try { signature.update(source.getBytes()); return signature.verify(data); } catch (SignatureException e) { e.printStackTrace(); return false; } }

測試

String source = service.signature(request); String sign = signService.signAndEncode(source); System.out.println(sign); assertTrue(verify(source, sign));

證明，內容沒有被篡改。

其中，ras_public_key.pem文件由openSSL生成。

ls@LS-8500:~$ openssl genrsa -out rsa_private_key.pem 1024Generating RSA private key, 1024 bit long modulus (2 primes)...+++++...............+++++e is 65537 (0x010001)ls@LS-8500:~$ openssl pkcs8 -topk8 -inform PEM -in rsa_private_key.pem -outform PEM -nocrypt-----BEGIN PRIVATE KEY-----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-----END PRIVATE KEY-----ls@LS-8500:~$ openssl rsa -in rsa_private_key.pem -pubout -out ras_public_key.pemwriting RSA key

補充知識：Java導入OpenSSL生成的公私鑰文件

1. 生成2048-bit RSA私鑰

$ openssl genrsa -out private_key.pem 2048

2. 導出RSA公鑰

$ openssl rsa -in private_key.pem -pubout -out public_key.pem

3. 將公私鑰文件private_key.pem和public_key.pem的頭尾注釋去掉

即：

-----BEGIN PUBLIC KEY-----

-----END PUBLIC KEY-----

-----BEGIN RSA PRIVATE KEY-----

-----END RSA PRIVATE KEY-----

4. 讀取公私鑰文件內容

// filePath即為private_key.pem和public_key.pempublic static String getKeyFromFile(String filePath) throws Exception { File file = new File(filePath); InputStream ins = new FileInputStream(file); BufferedReader br = new BufferedReader(new InputStreamReader(ins)); String readLine = null; StringBuffer sb = new StringBuffer(); while ((readLine = br.readLine()) != null) { sb.append(readLine); } br.close(); ins.close(); return new String(sb);}

5. 讀取私鑰

public static PrivateKey getPrivateKey(String privateKey) throws Exception { // 解碼由base64編碼的私鑰 byte[] keyBytes = decryptBASE64(privateKey); PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes); KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM); // 取得私鑰 PrivateKey priKey = keyFactory.generatePrivate(pkcs8KeySpec); return priKey;}

6. 讀取公鑰

public static PublicKey getPublicKey(String publicKeyStr) throws Exception { // 解碼由base64編碼的公鑰 byte[] keyBytes = decryptBASE64(publicKeyStr); // 取得公鑰 X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes); KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM); PublicKey publicKey = keyFactory.generatePublic(x509KeySpec); return publicKey;}

以上這篇Java讀取OpenSSL生成的PEM公鑰文件操作就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支持好吧啦網。