用Java加密和解密字符串

  • Z时代
  • 2024-01-10
  • 分类：问答

我是密码学的新手。我希望学习如何在文件中加密和解密文本……当我在net中引用相关文章时。我怀疑对同一文本进行多次加密后，单个文本的加密文本是否会相同？谁能解决我的疑问？

回答：

    public String encrypt(String str) {
        try {
            // Encode the string into bytes using utf-8
            byte[] utf8 = str.getBytes("UTF8");
            // Encrypt
            byte[] enc = ecipher.doFinal(utf8);
            // Encode bytes to base64 to get a string
            return new sun.misc.BASE64Encoder().encode(enc);
        } catch (javax.crypto.BadPaddingException e) {
        } catch (IllegalBlockSizeException e) {
        } catch (UnsupportedEncodingException e) {
        } catch (java.io.IOException e) {
        }
        return null;
    }
    public String decrypt(String str) {
        try {
            // Decode base64 to get bytes
            byte[] dec = new sun.misc.BASE64Decoder().decodeBuffer(str);
            // Decrypt
            byte[] utf8 = dcipher.doFinal(dec);
            // Decode using utf-8
            return new String(utf8, "UTF8");
        } catch (javax.crypto.BadPaddingException e) {
        } catch (IllegalBlockSizeException e) {
        } catch (UnsupportedEncodingException e) {
        } catch (java.io.IOException e) {
        }
        return null;
    }
}

这是使用该类的示例：

try {
    // Generate a temporary key. In practice, you would save this key.
    // See also Encrypting with DES Using a Pass Phrase.
    SecretKey key = KeyGenerator.getInstance("DES").generateKey();
    // Create encrypter/decrypter class
    DesEncrypter encrypter = new DesEncrypter(key);
    // Encrypt
    String encrypted = encrypter.encrypt("Don't tell anybody!");
    // Decrypt
    String decrypted = encrypter.decrypt(encrypted);
} catch (Exception e) {
}

以上是 用Java加密和解密字符串 的全部内容， 来源链接： utcz.com/qa/434967.html

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