如何使用非对称加密在另一个应用程序中解密一个应用程序中的文本？

Question

我试图了解如何在一个应用程序中解密我在单独的应用程序中加密的字符串。当我处于单个应用程序执行中时，我可以执行此操作，并且我使用生成公钥的同一密钥对中的私钥。但是，我想在一个应用程序中加密该值，并在另一应用程序中解密该值。基本上，我有一个 Web 服务发送值，我不想被篡改到应用程序，并且我计划使用非对称加密来处理它。如果我以错误的方式解决这个问题，请随时告诉我。

我尝试了各种加密技术，从对称加密开始。我遇到的问题是，该值每次都被加密为相同的文本 - 如果我的目标是防止某人篡改值，那么这不是很有用 - 一旦他们知道某些文本的加密版本，他们将能够在任何请求中使用它。我一直在尝试遵循这里的标准 - https://www.veracode.com/blog/research/encryption-and-decryption-java-cryptography 我可以让我的所有示例在单个事务中进行加密/解密 - 只是当我尝试在一个请求中加密并在第二个请求中解密时我失败了。

这是我当前的工作示例：

package com.ni.apps.cartencryptutil;

import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.xml.bind.DatatypeConverter;

import org.apache.commons.lang3.StringUtils;
import org.apache.log4j.Logger;

/**
 * Security class for encrypting and decrypting Strings (that also works in WC ver 7 and above)
 *
 * @author 
 *
 */
public class SecurityTools {
  private static final Logger logger = Logger.getLogger(SecurityTools.class);

  private Cipher cipher;
  private IvParameterSpec initVector;
  private SecretKey secretKey;
  PrivateKey privateKeyParam;
  PublicKey publicKeyParam;
  private static SecureRandom secureRandom = new SecureRandom();

  private static final String TRANSFORMATION = "RSA/ECB/OAEPWithSHA-1AndMGF1Padding";
  private static final String ALGORITHM_SHORT = "RSA";
  private static final String RNG_ALGORITHM = "SHA1PRNG";
  private static final String ALGORITHM = "PBKDF2WithHmacSHA256";
  private static final String UTF8 = "UTF-8";

  // exceptions
  private static final String _ERR_ILLEGAL_BLOCK_SIZE = "illegal block size exception.";
  private static final String _ERR_BAD_PADDING = "bad padding exception.";
  private static final String _ERR_INVALIDKEY = "invalidkey exception.";
  private static final String _ERR_PADDING = "padding exception.";
  private static final String _ERR_NO_SUCH_ALGORITHM = "no such algorithm exception.";
  private static final String _ERR_PASSPHRASE_IS_NULL = "passphrase is null.";
  private static final String _ERR_INVALID_ALGORITHM = "invalid algorithm exception.";
  private static final String _ERR_UNSUPPORTED_ENCODING = "encoding not supported.";
  private static final String _ERR_INVALID_KEY_SPEC = "invalid key spec exception.";

  /**
   * Constructor
   *
   * @throws EncryptionException
   */
  public SecurityTools() throws EncryptionException {
    if (logger.isDebugEnabled()) {
      logger.debug("entering Constructor");
    }
    try {
      cipher = Cipher.getInstance(ALGORITHM_SHORT);
      generateIV();
      generateKeys();
    } catch (NoSuchAlgorithmException iae) {
      logger.error(_ERR_NO_SUCH_ALGORITHM, iae);
      throw new EncryptionException(_ERR_NO_SUCH_ALGORITHM, iae);
    } catch (NoSuchPaddingException nspe) {
      logger.error(_ERR_PADDING, nspe);
      throw new EncryptionException(_ERR_PADDING, nspe);
    }
    if (logger.isDebugEnabled()) {
      logger.debug("exiting Constructor");
    }
  }

  /**
   * Encrypts a given plain text String, and returns the encrypted String
   *
   * @param plainText
   * @return
   * @throws EncryptionException
   */
  public String encrypt(String plainText, PublicKey publicKey) throws EncryptionException {
    if (logger.isDebugEnabled()) {
      logger.debug("entering encrypt");
    }

    String encryptedKey = null;
    try {
      byte[] byteToEncrypt = plainText.getBytes(UTF8);
      cipher.init(Cipher.ENCRYPT_MODE, publicKey);
      byte[] encryptedBytes = cipher.doFinal(byteToEncrypt);
      encryptedKey = DatatypeConverter.printBase64Binary(encryptedBytes);
    } catch (IllegalArgumentException iae) {
      logger.error(_ERR_PASSPHRASE_IS_NULL, iae);
      throw new EncryptionException(_ERR_PASSPHRASE_IS_NULL, iae);
    } catch (InvalidKeyException ike) {
      logger.error(_ERR_INVALIDKEY, ike);
      throw new EncryptionException(_ERR_INVALIDKEY, ike);
    } catch (BadPaddingException bpe) {
      logger.error(_ERR_BAD_PADDING, bpe);
      throw new EncryptionException(_ERR_BAD_PADDING, bpe);
    } catch (IllegalBlockSizeException bpe) {
      logger.error(_ERR_ILLEGAL_BLOCK_SIZE, bpe);
      throw new EncryptionException(_ERR_ILLEGAL_BLOCK_SIZE, bpe);
    } catch (UnsupportedEncodingException uee) {
      logger.error(_ERR_UNSUPPORTED_ENCODING, uee);
      throw new EncryptionException(_ERR_UNSUPPORTED_ENCODING, uee);
    } /*-catch (InvalidAlgorithmParameterException iape) {
      logger.error(_ERR_INVALID_ALGORITHM, iape);
      throw new EncryptionException(_ERR_INVALID_ALGORITHM, iape);
      }*/

    if (logger.isDebugEnabled()) {
      logger.debug("exiting encrypt");
    }

    return encryptedKey;
  }

  /**
   * Decrypts a given encrypted String, and returns the plain text String
   *
   * @param cipherTextStr
   * @return
   * @throws EncryptionException
   */
  public String decrypt(String cipherTextStr, PrivateKey privateKey) throws EncryptionException {
    if (logger.isDebugEnabled()) {
      logger.debug("entering decrypt");
    }

    String cleartext = null;
    try {
      cipher.init(Cipher.DECRYPT_MODE, privateKey);
      byte[] plainByte = cipher.doFinal(DatatypeConverter.parseBase64Binary(cipherTextStr));
      cleartext = new String(plainByte);
    } /*-catch (InvalidAlgorithmParameterException iape) {
      logger.error(_ERR_INVALID_ALGORITHM, iape);
      throw new EncryptionException(_ERR_INVALID_ALGORITHM, iape);
      } */catch (IllegalArgumentException iae) {
      logger.error(_ERR_PASSPHRASE_IS_NULL, iae);
      throw new EncryptionException(_ERR_PASSPHRASE_IS_NULL, iae);
    } catch (InvalidKeyException ike) {
      logger.error(_ERR_INVALIDKEY, ike);
      throw new EncryptionException(_ERR_INVALIDKEY, ike);
    } catch (BadPaddingException bpe) {
      logger.error(_ERR_BAD_PADDING, bpe);
      throw new EncryptionException(_ERR_BAD_PADDING, bpe);
    } catch (IllegalBlockSizeException bpe) {
      logger.error(_ERR_ILLEGAL_BLOCK_SIZE, bpe);
      throw new EncryptionException(_ERR_ILLEGAL_BLOCK_SIZE, bpe);
    }

    if (logger.isDebugEnabled()) {
      logger.debug("exiting decrypt");
    }

    return cleartext;
  }

  /**
   * Creates the IV using Secure Random Number Generator and an empty 16byte array
   *
   * @return
   */
  private void generateIV() {
    if (logger.isDebugEnabled()) {
      logger.debug("entering generateIV");
    }

    byte[] newSeed = secureRandom.generateSeed(16);
    secureRandom.setSeed(newSeed);
    byte[] byteIV = new byte[16];
    secureRandom.nextBytes(byteIV);
    initVector = new IvParameterSpec(byteIV);

    if (logger.isDebugEnabled()) {
      logger.debug("exiting generateIV");
    }
  }

  /**
   * Generates the Key used for decryption and encryption
   *
   * @throws EncryptionException
   */
  private void generateKeys() throws EncryptionException {

    try {
      String saltStr = "salty";// rbConfig.getString("salt");
      String passPhraseStr = "passy";// rbConfig.getString("passphrase");
      if (StringUtils.isEmpty(saltStr) || StringUtils.isEmpty(passPhraseStr)) {
        throw new EncryptionException(_ERR_PASSPHRASE_IS_NULL);
      }

      KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA");
      keyGen.initialize(512); // key size specified here.
      KeyPair pair = keyGen.generateKeyPair();
      privateKeyParam = pair.getPrivate();
      publicKeyParam = pair.getPublic();

      /*-byte[] salt = saltStr.getBytes();
      int iterations = 10000;
      int keyLength = 128;

      SecretKeyFactory factory = SecretKeyFactory.getInstance(ALGORITHM);
      SecretKey tmp = factory.generateSecret(new PBEKeySpec(passPhraseStr.toCharArray(), salt, iterations, keyLength));
      secretKey = new SecretKeySpec(tmp.getEncoded(), ALGORITHM_SHORT);*/
    } catch (NoSuchAlgorithmException iae) {
      logger.error(_ERR_NO_SUCH_ALGORITHM, iae);
      throw new EncryptionException(_ERR_NO_SUCH_ALGORITHM, iae);
    } /*-catch (InvalidKeySpecException e) {
      logger.error(_ERR_INVALID_KEY_SPEC, e);
      throw new EncryptionException(_ERR_INVALID_KEY_SPEC, e);
      }*/

  }

  /**
   * Test method
   *
   * @param args
   */
  public static void main(String[] args) {
    String[] message = { "mktest", "9248547896548752345", "okok234234234okok467467",
        "12" };
    String result = null;
    try {
      SecurityTools secTool = new SecurityTools();
      PrivateKey priv = secTool.getPrivateKeyParam();
      PublicKey publ = secTool.getPublicKeyParam();
      String temp = "N5B1zgbvts3Vwrt6qyL/TBzt62HTFz0ISySx5HFu02oVq1YEhFLbrgdCndROX4/5hMpxCHGM8UJBSyZUfjD/DA==";
      // System.out.println("ASYMMETRIC TEST" + secTool.decrypt(temp, priv));

      for (String mess : message) {
        result = secTool.encrypt(mess, publ);
        System.out.println(result);
        result = secTool.decrypt(result, priv);
        System.out.println(result);
      }
    } catch (Exception e) {
      System.out.println(e.getMessage());
      e.printStackTrace();

    }
  }

  /**
   * @return the privateKeyParam
   */
  public PrivateKey getPrivateKeyParam() {
    return privateKeyParam;
  }

  /**
   * @return the publicKeyParam
   */
  public PublicKey getPublicKeyParam() {
    return publicKeyParam;
  }

  class EncryptionException extends Exception {

    private static final long serialVersionUID = 1L;

    public EncryptionException() {}

    public EncryptionException(String message, Throwable cause) {
      super(message, cause);
    }

    public EncryptionException(String message) {
      super(message);
    }

    public EncryptionException(Throwable cause) {
      super(cause);
    }
  }
}

当我按原样运行它时，它可以工作，因为主要是一次性完成加密和解密。但是，当我从运行中获取输出并将其存储在 main() 中的临时字符串中，然后取消注释 System.out.println("ASYMMETRIC TEST" + 行时，它失败了

com.ni.apps.cartencryptutil.SecurityTools$EncryptionException: bad padding exception.
    at com.ni.apps.cartencryptutil.SecurityTools.decrypt(SecurityTools.java:154)
    at com.ni.apps.cartencryptutil.SecurityTools.main(SecurityTools.java:239)
Caused by: javax.crypto.BadPaddingException: Decryption error
    at sun.security.rsa.RSAPadding.unpadV15(RSAPadding.java:380)
    at sun.security.rsa.RSAPadding.unpad(RSAPadding.java:291)
    at com.sun.crypto.provider.RSACipher.doFinal(RSACipher.java:363)
    at com.sun.crypto.provider.RSACipher.engineDoFinal(RSACipher.java:389)
    at javax.crypto.Cipher.doFinal(Cipher.java:2165)
    at com.ni.apps.cartencryptutil.SecurityTools.decrypt(SecurityTools.java:141)
    ... 1 more

我认为我的问题是我每次都重新生成一个新的密钥对，这只能作为一对起作用一次。因此，一旦我尝试将来自一个密钥对的私钥与使用完全不同的密钥对加密的文本进行匹配，就会失败。但我还没有找到在这种情况下你应该如何实现这一目标。

Answer 1

package com.ni.apps.cartencryptutil;

import java.io.UnsupportedEncodingException;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.spec.InvalidKeySpecException;
import java.util.Locale;
import java.util.MissingResourceException;
import java.util.ResourceBundle;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;
import javax.xml.bind.DatatypeConverter;

import org.apache.commons.lang3.StringUtils;
import org.apache.log4j.Logger;

import com.ni.apps.cartencryptutil.exceptions.EncryptionException;

/**
 * Security class for encrypting and decrypting Strings (that also works in WC ver 7 and above).
 *
 * @author mkohanek
 *
 */
public class SecurityTools {
  private static final Logger logger = Logger.getLogger(SecurityTools.class);

  private Cipher cipher;
  private IvParameterSpec initVector;
  private SecretKey secretKey;
  private transient ResourceBundle rbConfig;

  private static SecureRandom secureRandom = new SecureRandom();
  private static final String AES_ALGORITHM = "AES/CBC/PKCS5Padding";
  private static final String ALGORITHM_SHORT = "AES";
  private static final String PBE_ALGORITHM = "PBEWithMD5AndDES";
  private static final String UTF8 = "UTF-8";
  private static final int ITERATIONS = 10000;
  private static final int KEY_LENGTH = 128;

  // exceptions
  private static final String _ERR_ILLEGAL_BLOCK_SIZE = "illegal block size exception.";
  private static final String _ERR_BAD_PADDING = "bad padding exception.";
  private static final String _ERR_INVALIDKEY = "invalidkey exception.";
  private static final String _ERR_PADDING = "padding exception.";
  private static final String _ERR_NO_SUCH_ALGORITHM = "no such algorithm exception.";
  private static final String _ERR_PASSPHRASE_IS_NULL = "passphrase is null.";
  private static final String _ERR_SALT_IS_NULL = "salt is null.";
  private static final String _ERR_INVALID_ALGORITHM = "invalid algorithm exception.";
  private static final String _ERR_UNSUPPORTED_ENCODING = "encoding not supported.";
  private static final String _ERR_INVALID_KEY_SPEC = "invalid key spec exception.";

  /**
   * Constructor
   *
   * @param salt
   *          - for encryption, obtain salt from generateSalt(). for decryption, you should use the same salt used during encryption
   * @throws EncryptionException
   */
  public SecurityTools(String salt) throws EncryptionException {
    if (logger.isDebugEnabled()) {
      logger.debug("entering Constructor");
    }
    try {
      loadProperties();
      cipher = Cipher.getInstance(AES_ALGORITHM);
      generateIV(salt);
      generateKey(salt);
    } catch (NoSuchAlgorithmException iae) {
      logger.error(_ERR_NO_SUCH_ALGORITHM, iae);
      throw new EncryptionException(_ERR_NO_SUCH_ALGORITHM, iae);
    } catch (NoSuchPaddingException nspe) {
      logger.error(_ERR_PADDING, nspe);
      throw new EncryptionException(_ERR_PADDING, nspe);
    }
    if (logger.isDebugEnabled()) {
      logger.debug("exiting Constructor");
    }
  }

  /**
   * Constructor
   *
   * @param salt
   *          - for encryption, obtain salt from generateSalt(). for decryption, you should use the same salt used during encryption
   * @param passPhrase
   *          - Allows client to pass in a passphrase it wants to use rather than use the one this library defines. This must also be used when decrypting. The length limit for this key is 16
   *          characters
   * @throws EncryptionException
   */
  public SecurityTools(String salt, String passPhrase) throws EncryptionException {
    if (logger.isDebugEnabled()) {
      logger.debug("entering Constructor");
    }
    try {
      loadProperties();
      cipher = Cipher.getInstance(AES_ALGORITHM);
      generateIV(salt);
      generateKey(salt, passPhrase);
    } catch (NoSuchAlgorithmException iae) {
      logger.error(_ERR_NO_SUCH_ALGORITHM, iae);
      throw new EncryptionException(_ERR_NO_SUCH_ALGORITHM, iae);
    } catch (NoSuchPaddingException nspe) {
      logger.error(_ERR_PADDING, nspe);
      throw new EncryptionException(_ERR_PADDING, nspe);
    }
    if (logger.isDebugEnabled()) {
      logger.debug("exiting Constructor");
    }
  }

  /**
   * Encrypts a given plain text String, and returns the encrypted String
   *
   * @param plainText
   * @return
   * @throws EncryptionException
   */
  public String encrypt(String plainText) throws EncryptionException {
    if (logger.isDebugEnabled()) {
      logger.debug("entering encrypt");
    }

    String encryptedKey = null;
    try {
      byte[] byteToEncrypt = plainText.getBytes(UTF8);
      cipher.init(Cipher.ENCRYPT_MODE, secretKey, initVector, new SecureRandom());
      byte[] encryptedBytes = cipher.doFinal(byteToEncrypt);
      encryptedKey = DatatypeConverter.printBase64Binary(encryptedBytes);
    } catch (IllegalArgumentException iae) {
      logger.error(_ERR_PASSPHRASE_IS_NULL, iae);
      throw new EncryptionException(_ERR_PASSPHRASE_IS_NULL, iae);
    } catch (InvalidKeyException ike) {
      logger.error(_ERR_INVALIDKEY, ike);
      throw new EncryptionException(_ERR_INVALIDKEY, ike);
    } catch (BadPaddingException bpe) {
      logger.error(_ERR_BAD_PADDING, bpe);
      throw new EncryptionException(_ERR_BAD_PADDING, bpe);
    } catch (IllegalBlockSizeException bpe) {
      logger.error(_ERR_ILLEGAL_BLOCK_SIZE, bpe);
      throw new EncryptionException(_ERR_ILLEGAL_BLOCK_SIZE, bpe);
    } catch (UnsupportedEncodingException uee) {
      logger.error(_ERR_UNSUPPORTED_ENCODING, uee);
      throw new EncryptionException(_ERR_UNSUPPORTED_ENCODING, uee);
    } catch (InvalidAlgorithmParameterException iape) {
      logger.error(_ERR_INVALID_ALGORITHM, iape);
      throw new EncryptionException(_ERR_INVALID_ALGORITHM, iape);
    }

    if (logger.isDebugEnabled()) {
      logger.debug("exiting encrypt");
    }

    return encryptedKey;
  }

  /**
   * Decrypts a given encrypted String, and returns the plain text String
   *
   * @param cipherTextStr
   * @return
   * @throws EncryptionException
   */
  public String decrypt(String cipherTextStr) throws EncryptionException {
    if (logger.isDebugEnabled()) {
      logger.debug("entering decrypt");
    }

    String cleartext = null;
    try {
      cipher.init(Cipher.DECRYPT_MODE, secretKey, initVector);
      byte[] plainByte = cipher.doFinal(DatatypeConverter.parseBase64Binary(cipherTextStr));
      cleartext = new String(plainByte);
    } catch (InvalidAlgorithmParameterException iape) {
      logger.error(_ERR_INVALID_ALGORITHM, iape);
      throw new EncryptionException(_ERR_INVALID_ALGORITHM, iape);
    } catch (IllegalArgumentException iae) {
      logger.error(_ERR_PASSPHRASE_IS_NULL, iae);
      throw new EncryptionException(_ERR_PASSPHRASE_IS_NULL, iae);
    } catch (InvalidKeyException ike) {
      logger.error(_ERR_INVALIDKEY, ike);
      throw new EncryptionException(_ERR_INVALIDKEY, ike);
    } catch (BadPaddingException bpe) {
      logger.error(_ERR_BAD_PADDING, bpe);
      throw new EncryptionException(_ERR_BAD_PADDING, bpe);
    } catch (IllegalBlockSizeException bpe) {
      logger.error(_ERR_ILLEGAL_BLOCK_SIZE, bpe);
      throw new EncryptionException(_ERR_ILLEGAL_BLOCK_SIZE, bpe);
    }

    if (logger.isDebugEnabled()) {
      logger.debug("exiting decrypt");
    }

    return cleartext;
  }

  /**
   * Creates the IV using Secure Random Number Generator and an empty 16byte array
   *
   * @return
   */
  private void generateIV(String salt) {
    if (logger.isDebugEnabled()) {
      logger.debug("entering generateIV");
    }

    byte[] newSeed = DatatypeConverter.parseBase64Binary(salt);
    initVector = new IvParameterSpec(newSeed);

    if (logger.isDebugEnabled()) {
      logger.debug("exiting generateIV");
    }
  }

  /**
   * Generates the Key used for decryption and encryption using passphrase from properties file on library
   *
   ** @param saltStr
   * @return
   * @throws EncryptionException
   */
  private void generateKey(String saltStr) throws EncryptionException {
    if (logger.isDebugEnabled()) {
      logger.debug("entering generateKey");
    }

    try {
      String passPhraseStr = rbConfig.getString("passphrase");
      if (StringUtils.isEmpty(passPhraseStr)) {
        throw new EncryptionException(_ERR_PASSPHRASE_IS_NULL);
      }
      if (StringUtils.isEmpty(saltStr)) {
        throw new EncryptionException(_ERR_SALT_IS_NULL);
      }

      byte[] salt = DatatypeConverter.parseBase64Binary(saltStr);

      SecretKeyFactory factory = SecretKeyFactory.getInstance(PBE_ALGORITHM);
      SecretKey tmp = factory.generateSecret(new PBEKeySpec(passPhraseStr.toCharArray(), salt, ITERATIONS, KEY_LENGTH));
      secretKey = new SecretKeySpec(tmp.getEncoded(), ALGORITHM_SHORT);
    } catch (NoSuchAlgorithmException iae) {
      logger.error(_ERR_NO_SUCH_ALGORITHM, iae);
      throw new EncryptionException(_ERR_NO_SUCH_ALGORITHM, iae);
    } catch (InvalidKeySpecException e) {
      logger.error(_ERR_INVALID_KEY_SPEC, e);
      throw new EncryptionException(_ERR_INVALID_KEY_SPEC, e);
    }

    if (logger.isDebugEnabled()) {
      logger.debug("exiting generateKey");
    }
  }

  /**
   * Generates the Key used for decryption and encryption using passphrase passed in
   *
   * @param saltStr
   * @param passPhrase
   * @throws EncryptionException
   */
  private void generateKey(String saltStr, String passPhrase) throws EncryptionException {
    if (logger.isDebugEnabled()) {
      logger.debug("entering generateKey");
    }

    try {
      if (StringUtils.isEmpty(passPhrase)) {
        throw new EncryptionException(_ERR_PASSPHRASE_IS_NULL);
      }
      if (StringUtils.isEmpty(saltStr)) {
        throw new EncryptionException(_ERR_SALT_IS_NULL);
      }

      byte[] salt = DatatypeConverter.parseBase64Binary(saltStr);

      SecretKeyFactory factory = SecretKeyFactory.getInstance(PBE_ALGORITHM);
      SecretKey tmp = factory.generateSecret(new PBEKeySpec(passPhrase.toCharArray(), salt, ITERATIONS, KEY_LENGTH));
      secretKey = new SecretKeySpec(tmp.getEncoded(), ALGORITHM_SHORT);
    } catch (NoSuchAlgorithmException iae) {
      logger.error(_ERR_NO_SUCH_ALGORITHM, iae);
      throw new EncryptionException(_ERR_NO_SUCH_ALGORITHM, iae);
    } catch (InvalidKeySpecException e) {
      logger.error(_ERR_INVALID_KEY_SPEC, e);
      throw new EncryptionException(_ERR_INVALID_KEY_SPEC, e);
    }

    if (logger.isDebugEnabled()) {
      logger.debug("exiting generateKey");
    }
  }

  /**
   * This generates a random value of user defined size that can be used to encrypt data. The decrypting client will then need to access this value to be able to decrypt
   *
   * @return
   */
  public static String generateSaltStr(int size) {
    String salt = null;
    byte[] newSeed = secureRandom.generateSeed(size);
    salt = DatatypeConverter.printBase64Binary(newSeed);

    return salt;
  }

  /**
   * This generates a random 16 bit value that can be used to encrypt data. The decrypting client will then need to access this value to be able to decrypt
   *
   * @return
   */
  public static String generateSaltStr() {
    String salt = null;
    byte[] newSeed = secureRandom.generateSeed(16);
    salt = DatatypeConverter.printBase64Binary(newSeed);

    return salt;
  }

  /**
   * Loads properties files (call before attempting to read any properties files)
   */
  private void loadProperties() {
    try {
      rbConfig = ResourceBundle.getBundle("application", Locale.US);
    } catch (MissingResourceException ie) {
      logger.fatal(
          "FATAL: SecurityTools.loadProperties Cannot read the properties file.  Please ensure the file is on the classpath.");
    } catch (Exception e) {
      logger.fatal(
          "FATAL: SecurityTools.loadProperties Cannot read the properties file.  Please ensure the file is on the classpath.");
    }
  }

  /**
   * Test method
   *
   * @param args
   */
  public static void main(String[] args) {
    String[] message = { "mkohanek", "9248547896548752345", "okok234234234okok467467",
        "12" };
    String result = null;
    try {
      // ASYMMETRIC TEST - use this block to test values are usable over separate sessions by taking output from loop below and using it here for subsequent calls
      // String previousSalt = "jriUh+01HlHw4g3mO9PLcw==";
      // SecurityTools asSecTool = new SecurityTools(previousSalt);
      // String previousEncryptedValue = "nFVxkzdx+psiUVkCW5NztQ==";
      // System.out.println("should decrypt to an expected value - " + asSecTool.decrypt(previousEncryptedValue));
      // END ASYMMETRIC TEST

      // SYMMETRIC TEST - tests that single requests will encrypt and decrypt successfully
      String salt = generateSaltStr(16);
      System.out.println("salt - " + salt);
      SecurityTools secTool = new SecurityTools(salt);
      for (String mess : message) {
        result = secTool.encrypt(mess);
        System.out.println(result);
        result = secTool.decrypt(result);
        System.out.println(result);
      }
      // END SYMMETRIC TEST
    } catch (Exception e) {
      System.out.println(e.getMessage());
      e.printStackTrace();

    }
  }

}

Answer 2

我只是希望能够阅读其他志同道合的成年人发来的消息，而无需支付 VIP 会员费。我认为，如果你支付会员费，那么你就不是一个非常重要的人，而是一个非常没有安全感的人，甚至是一个非常没有耐心的人。我称之为 FOMO 害怕错过。当然，只要你付出一点努力，就应该能够绕过，这种为了从别人的欲望中赚钱而实施的限制，需要一点点幸福。谁能解读一下这个“Nir wKfNU lpNHMFF FwA A OUi HSWdhafokjQB nlCLG xTtyW Wqlah kaSw VZFAy zGXNOW f”提前谢谢约翰尼