rsa公鑰私鑰生成工具-java代碼如下：

/*** * @Description: RSA工具類，支持長度為2048的秘鑰*/ @Slf4j public class RSAUtils {/*** 加密算法RSA*/private static final String KEY_ALGORITHM = "RSA";/*** 簽名算法*/private static final String SIGNATURE_ALGORITHM = "SHA256withRSA";/*** 獲取公鑰的key*/private static final String PUBLIC_KEY = "RSAPublicKey";/*** 獲取私鑰的key*/private static final String PRIVATE_KEY = "RSAPrivateKey";/*** RSA最大加密明文大小*/private static final int MAX_ENCRYPT_BLOCK = 117;/*** RSA最大解密密文大小*/private static final int MAX_DECRYPT_BLOCK = 256;/*** @param keySize 生成的秘鑰長度 一般為1024或2048* @return* @throws Exception*/public static Map<String, Object> genKeyPair(int keySize){KeyPairGenerator keyPairGen = null;try {keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);} catch (NoSuchAlgorithmException e) {log.error(String.format("生密鑰異常%s", ExceptionUtils.getStackTrace(e)));throw new GlobalException(BasicCodeMsg.SERVER_ERROR);}keyPairGen.initialize(keySize);KeyPair keyPair = keyPairGen.generateKeyPair();RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();Map<String, Object> keyMap = new HashMap<String, Object>(2);keyMap.put(PUBLIC_KEY, publicKey);keyMap.put(PRIVATE_KEY, privateKey);log.info("publicKey：" + Base64.encode(publicKey.getEncoded()));log.info("privateKey：" + Base64.encode(privateKey.getEncoded()));return keyMap;}/*** 對已加密數據進行簽名** @param data 已加密的數據* @param privateKey 私鑰* @return 對已加密數據生成的簽名* @throws Exception*/public static String sign(byte[] data, String privateKey) throws Exception {byte[] keyBytes = Base64.decode(privateKey);PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);PrivateKey privateK = keyFactory.generatePrivate(pkcs8KeySpec);Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);signature.initSign(privateK);signature.update(data);return Base64.encode(signature.sign());}/*** 驗簽** @param data 簽名之前的數據* @param publicKey 公鑰* @param sign 簽名之后的數據* @return 驗簽是否成功* @throws Exception*/public static boolean verify(byte[] data, String publicKey, String sign) throws Exception {byte[] keyBytes = Base64.decode(publicKey);X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);PublicKey publicK = keyFactory.generatePublic(keySpec);Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);signature.initVerify(publicK);signature.update(data);return signature.verify(Base64.decode(sign));}/*** 用私鑰對數據進行解密** @param encryptedData 使用公鑰加密過的數據* @param privateKey 私鑰* @return 解密后的數據* @throws Exception*/public static byte[] decryptByPrivateKey(byte[] encryptedData, String privateKey) throws Exception {byte[] keyBytes = Base64.decode(privateKey);PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);//Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());Cipher cipher = Cipher.getInstance(KEY_ALGORITHM);cipher.init(Cipher.DECRYPT_MODE, privateK);int inputLen = encryptedData.length;ByteArrayOutputStream out = new ByteArrayOutputStream();int offSet = 0;byte[] cache;int i = 0;// 對數據分段解密while (inputLen - offSet > 0) {if (inputLen - offSet > MAX_DECRYPT_BLOCK) {cache = cipher.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);} else {cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet);}out.write(cache, 0, cache.length);i++;offSet = i * MAX_DECRYPT_BLOCK;}byte[] decryptedData = out.toByteArray();out.close();return decryptedData;}/*** 公鑰解密** @param encryptedData 使用私鑰加密過的數據* @param publicKey 公鑰* @return 解密后的數據* @throws Exception*/public static byte[] decryptByPublicKey(byte[] encryptedData, String publicKey) throws Exception {byte[] keyBytes = Base64.decode(publicKey);X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);Key publicK = keyFactory.generatePublic(x509KeySpec);Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());cipher.init(Cipher.DECRYPT_MODE, publicK);int inputLen = encryptedData.length;ByteArrayOutputStream out = new ByteArrayOutputStream();int offSet = 0;byte[] cache;int i = 0;// 對數據分段解密while (inputLen - offSet > 0) {if (inputLen - offSet > MAX_DECRYPT_BLOCK) {cache = cipher.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);} else {cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet);}out.write(cache, 0, cache.length);i++;offSet = i * MAX_DECRYPT_BLOCK;}byte[] decryptedData = out.toByteArray();out.close();return decryptedData;}/*** 公鑰加密** @param data 需要加密的數據* @param publicKey 公鑰* @return 使用公鑰加密后的數據* @throws Exception*/public static byte[] encryptByPublicKey(byte[] data, String publicKey) throws Exception {byte[] keyBytes = Base64.decode(publicKey);X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);Key publicK = keyFactory.generatePublic(x509KeySpec);// 對數據加密Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());cipher.init(Cipher.ENCRYPT_MODE, publicK);int inputLen = data.length;ByteArrayOutputStream out = new ByteArrayOutputStream();int offSet = 0;byte[] cache;int i = 0;// 對數據分段加密while (inputLen - offSet > 0) {if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);} else {cache = cipher.doFinal(data, offSet, inputLen - offSet);}out.write(cache, 0, cache.length);i++;offSet = i * MAX_ENCRYPT_BLOCK;}byte[] encryptedData = out.toByteArray();out.close();return encryptedData;}/*** 私鑰加密** @param data 待加密的數據* @param privateKey 私鑰* @return 使用私鑰加密后的數據* @throws Exception*/public static byte[] encryptByPrivateKey(byte[] data, String privateKey) throws Exception {byte[] keyBytes = Base64.decode(privateKey);PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());cipher.init(Cipher.ENCRYPT_MODE, privateK);int inputLen = data.length;ByteArrayOutputStream out = new ByteArrayOutputStream();int offSet = 0;byte[] cache;int i = 0;// 對數據分段加密while (inputLen - offSet > 0) {if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);} else {cache = cipher.doFinal(data, offSet, inputLen - offSet);}out.write(cache, 0, cache.length);i++;offSet = i * MAX_ENCRYPT_BLOCK;}byte[] encryptedData = out.toByteArray();out.close();return encryptedData;}/*** 獲取私鑰** @param keyMap 生成的秘鑰對* @return* @throws Exception*/public static String getPrivateKey(Map<String, Object> keyMap){Key key = (Key) keyMap.get(PRIVATE_KEY);return Base64.encode(key.getEncoded());}/*** 獲取公鑰** @param keyMap 生成的秘鑰對* @return* @throws Exception*/public static String getPublicKey(Map<String, Object> keyMap) {Key key = (Key) keyMap.get(PUBLIC_KEY);return Base64.encode(key.getEncoded());} }

測試結果：

public static void main(String[] args) {//生成平臺密鑰Map<String, Object> keyPair = RSAUtils.genKeyPair(2048);}

總結

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