JDK8的JCE是不支持读取PEM文件的。需要使用bouncycastle。
项目需求，使用SHA1WithRSA算法，对接口数据做签名。
代码如下：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 @Service class 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(); } } } 单元测试，验证签名是否正确。先初始化Signature：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 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(); } } 验证方法
1 2 3 4 5 6 7 8 9 10 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; } } 测试
1 2 3 4 String source = service.signature(request); String sign = signService.signAndEncode(source); System.out.println(sign); assertTrue(verify(source, sign)); 证明，内容没有被篡改。
其中，ras_public_key.pem文件由openSSL生成。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 ls@LS-8500:~$ openssl genrsa -out rsa_private_key.pem 1024 Generating 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----- MIICeQIBADANBgkqhkiG9w0BAQEFAASCAmMwggJfAgEAAoGBAOk4nqif4LtwfePZ IeGgUc5XYbWk8FpT6UEgO/43i0uprf2RXs3j9eDjOyRwkW2iMCF6S3bNxYuiyJv4 eNc+8w87PJ9bOMRq9WH+ISWIfnPu2x6A1oNOeNkAL7v3ztmpcAn2bNMJ5VscSKp8 S1U02LbHpOErPjvnEul9a/e8xb7TAgMBAAECgYEAvpMeyuoCKQiORo6aqhVoY7Vx yY2jPhyNYUNm4qAeulBINgkBMDtUI1VrcaZun+jFbcXSPp19DFKTnSgYDsOItt04 VLRSZm5yU1EfL21ZvbxIQjjSMv4BxndjdfdoGh5Gve0p1vqtnXtMivkNNI/HdCrx R2CpcGNo4Uqg+zgvwzECQQD1yULuH1sMTEGqLHZaBXVVt1ny+oF+3CnDz2ZdQTWj SLFfBSKplCL8TuEakauUiYf6BVtOjrpzKHRs7hDuZLW5AkEA8umwPbO09ijQdg5e /nkEnJnG5C4krXZuIcsYnf1wrBCLAoOImgDSvVzRrXHMGNvvP0D3gTIxwZSNPt57 1OFe6wJBAJmcOm9WO3IZKqTvetxSMv3qRJY+B7bAZH3TXleEDMDLCsenDv3K7n6f 0cHoLsL7nXcd5+3V+CNGslTuCLjlSkkCQQCM1fqNu5xmwAElAW4IIkgPN4U+FJbF T43I4ATUzPU/fZPrEDHqACIvEhqrcfgATbuns9YMPPrmHmfKFJo9MbGjAkEAzmbW IsDQP4S8TJVd6PvyNZgNrTZvtlMT8/v4MytaEErrljhAR/YLKLcWFxLmQNAL9g4M SsHT8KunE5YrBmkXkg== -----END PRIVATE KEY----- ls@LS-8500:~$ openssl rsa -in rsa_private_key.pem -pubout -out ras_public_key.pem writing RSA key 补充知识：Java导入OpenSSL生成的公私钥文件
1. 生成2048-bit RSA私钥
$ openssl genrsa -out private_key.pem 2048
2. 导出RSA公钥
$ openssl rsa -in private_key.pem -pubout -out public_key.pem
3. 将公私钥文件private_key.pem和public_key.pem的头尾注释去掉
即：
-----BEGIN PUBLIC KEY-----
-----END PUBLIC KEY-----
-----BEGIN RSA PRIVATE KEY-----
-----END RSA PRIVATE KEY-----
4. 读取公私钥文件内容
1 2 3 4 5 6 7 8 9 10 11 12 13 14 // filePath即为private_key.pem和public_key.pem public 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. 读取私钥
1 2 3 4 5 6 7 8 9 public static PrivateKey getPrivateKey(String privateKey) throws Exception { // 解码由base64编码的私钥 byte[] keyBytes = decryptBASE64(privateKey); PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes); KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM); // 取得私钥 PrivateKey priKey = keyFactory.generatePrivate(pkcs8KeySpec); return priKey; } 6. 读取公钥
1 2 3 4 5 6 7 8 9 public static PublicKey getPublicKey(String publicKeyStr) throws Exception { // 解码由base64编码的公钥 byte[] keyBytes = decryptBASE64(publicKeyStr); // 取得公钥 X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes); KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM); PublicKey publicKey = keyFactory.generatePublic(x509KeySpec); return publicKey; } 以上这篇Java读取OpenSSL生成的PEM公钥文件操作就是小编分享给大家的全部内容了
