无法在Android上解密AES?

无法在Android上解密AES?,android,base64,hex,aes,Android,Base64,Hex,Aes,我是android开发的新手,现在我在android上实现了一个AES,它可以用用户输入密码加密字符串。加密似乎很好,可以省略Base64/Hex编码的字符串 但当我试图解密它时,问题来了:解密时,遗漏总是让我看到一堆乱七八糟的字符 为了摆脱它,我试着在从字符串转换到字节[]时定义一个字符集(如UTF-8)来调试它,但没有命中,还试着用基64或十六进制编码省略,但都失败了 我还尝试在使用cipher.getInstance方法时定义AES/CBC/PKCS5Padding或仅定义AES,但仍然没

我是android开发的新手,现在我在android上实现了一个AES,它可以用用户输入密码加密字符串。加密似乎很好,可以省略Base64/Hex编码的字符串

但当我试图解密它时,问题来了:解密时,遗漏总是让我看到一堆乱七八糟的字符

为了摆脱它,我试着在从字符串转换到字节[]时定义一个字符集(如UTF-8)来调试它,但没有命中,还试着用基64或十六进制编码省略,但都失败了

我还尝试在使用cipher.getInstance方法时定义AES/CBC/PKCS5Padding或仅定义AES,但仍然没有成功

真烦人,你们能帮帮我吗

忘了提到我曾经问过一个类似的问题,那里的语法问题已经纠正了

下面是代码:

用于加密

public String AESEncrypt(String sKey, String PlainMsg)
                throws Exception {
            //Try use some Android based alert dialog to catch this exception.
            if (sKey == null) {
                Log.e("SecureChat", "IllegalArgumentException Catched");
                throw new IllegalArgumentException ("NULL Secret NOT ALLOWED!");
            }           
            /*Old Method
            //byte[] rawKey = getRawKey(sKey.getBytes("UTF-8"));
            byte[] rawKey = getRawKey(sKey.getBytes());
            //Encrypt start
            SecretKeySpec keySpec = new SecretKeySpec(rawKey, "AES");
            Cipher cipher = Cipher.getInstance("AES");
            cipher.init(Cipher.ENCRYPT_MODE, keySpec);
            //byte[] cipherText = cipher.doFinal(PlainMsg.getBytes("UTF-8"));
            byte[] cipherText = cipher.doFinal(PlainMsg.getBytes());
            return Base64Encoded(cipherText);
            */
            //New Method
            byte[] salt = getSalt();
            SecretKeyFactory factory = SecretKeyFactory.getInstance("PBEWITHSHA256AND256BITAES-CBC-BC");
            KeySpec spec = new PBEKeySpec(sKey.toCharArray(), salt, 1024, 256); 
            SecretKey tmp = factory.generateSecret(spec);
            SecretKey secret = new SecretKeySpec(tmp.getEncoded(), "AES");
            //Encryption Process
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            cipher.init(Cipher.ENCRYPT_MODE, secret);
            byte[] cipherText = cipher.doFinal(PlainMsg.getBytes());
            //return Base64Encoded(cipherText);
            //Hex
            return toHex(cipherText);
        }
用于解密

public String AESDecrypt(String sKey, String EncryptMsg)
                throws Exception {          
            /*Old Method
            //byte[] rawKey = getRawKey(sKey.getBytes("UTF-8"));
            byte[] rawKey = getRawKey(sKey.getBytes());
            SecretKeySpec keySpec = new SecretKeySpec(rawKey, "AES");
            Cipher cipher = Cipher.getInstance("AES");
            cipher.init(Cipher.DECRYPT_MODE, keySpec);
            //byte[] plainText = Base64Decoded(EncryptMsg.getBytes("UTF-8"));
            byte[] plainText = Base64Decoded(EncryptMsg);           
            cipher.doFinal(plainText);
            return new String(plainText, "UTF-8");
            */
            //New Method
            byte[] salt = getSalt();
            SecretKeyFactory factory = SecretKeyFactory.getInstance("PBEWITHSHA256AND256BITAES-CBC-BC");
            KeySpec spec = new PBEKeySpec(sKey.toCharArray(), salt, 1024, 256); 
            SecretKey tmp = factory.generateSecret(spec);
            SecretKey secret = new SecretKeySpec(tmp.getEncoded(), "AES");
            //byte[] bCipherText = Base64Decoded(EncryptMsg);
            //Hex
            byte[] bCipherText = toByte(EncryptMsg);
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            cipher.init(Cipher.ENCRYPT_MODE, secret);
            cipher.doFinal(bCipherText);
            return new String(bCipherText);
        }

        private byte[] getSalt() throws NoSuchAlgorithmException {
            /*Mark for old key method
            //Initialize the KeyGenerator
            KeyGenerator kgen = KeyGenerator.getInstance("AES");
            SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
            sr.setSeed(seed);
            //Init for 256bit AES key
            kgen.init(Constants.AES_KEY_SIZE, sr);;
            SecretKey secret = kgen.generateKey();
            //Get secret raw key
            byte[] rawKey = secret.getEncoded();
            return rawKey;
            */

            //New key method with some salt
            SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
            byte[] ransalt = new byte[20];
            random.nextBytes(ransalt);
            return ransalt;
        }

        @Override
        public byte[] getRawKey(byte[] seed) throws Exception {
            /*Old Method
            //Initialize the KeyGenerator
            KeyGenerator kgen = KeyGenerator.getInstance("AES");
            SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
            sr.setSeed(seed);
            //Init for 256bit AES key
            kgen.init(Constants.AES_KEY_SIZE, sr);
            SecretKey secret = kgen.generateKey();
            //Get secret raw key
            byte[] rawKey = secret.getEncoded();
            return rawKey;
            */
            return null;
        }
/**
 * 
 * @param toBeDecoded
 * @return
 */
        public byte[] Base64Decoded(String toBeDecoded) {
            byte[] decoded = Base64.decode(toBeDecoded, 0);
            return decoded;
        }

        //Hex Mode
        public String toHex(String txt) {
            return toHex(txt.getBytes());
        }
        public String fromHex(String hex) {
            return new String(toByte(hex));
        }

        public byte[] toByte(String hexString) {
            int len = hexString.length()/2;
            byte[] result = new byte[len];
            for (int i = 0; i < len; i++)
                result[i] = Integer.valueOf(hexString.substring(2*i, 2*i+2), 16).byteValue();
            return result;
        }

        public String toHex(byte[] buf) {
            if (buf == null)
                return "";
            StringBuffer result = new StringBuffer(2*buf.length);
            for (int i = 0; i < buf.length; i++) {
                appendHex(result, buf[i]);
            }
            return result.toString();
        }
        private final String HEX = "0123456789ABCDEF";
        private void appendHex(StringBuffer sb, byte b) {
            sb.append(HEX.charAt((b>>4)&0x0f)).append(HEX.charAt(b&0x0f));
        }


    }
publicstringaesdefcrypt(stringskey,stringencryptmsg)
抛出异常{
/*旧方法
//byte[]rawKey=getRawKey(sKey.getBytes(“UTF-8”);
byte[]rawKey=getRawKey(sKey.getBytes());
SecretKeySpec keySpec=新的SecretKeySpec(rawKey,“AES”);
Cipher Cipher=Cipher.getInstance(“AES”);
cipher.init(cipher.DECRYPT_模式,keySpec);
//字节[]明文=base64解码(EncryptMsg.getBytes(“UTF-8”);
字节[]明文=base64已解码(EncryptMsg);
cipher.doFinal(纯文本);
返回新字符串(纯文本,“UTF-8”);
*/
//新方法
字节[]salt=getSalt();
SecretKeyFactory=SecretKeyFactory.getInstance(“pbewithsha256和256biates-CBC-BC”);
KeySpec spec=new-PBEKeySpec(sKey.toCharArray(),salt,1024256);
SecretKey tmp=工厂生成信任(规范);
SecretKey secret=newsecretkeyspec(tmp.getEncoded(),“AES”);
//字节[]bCipherText=base64已解码(EncryptMsg);
//六角形
字节[]bCipherText=toByte(EncryptMsg);
Cipher Cipher=Cipher.getInstance(“AES/CBC/PKCS5Padding”);
cipher.init(cipher.ENCRYPT_模式,secret);
cipher.doFinal(bCipherText);
返回新字符串(bCipherText);
}
私有字节[]getSalt()引发NoSuchAlgorithmException{
/*旧键方法的标记
//初始化密钥生成器
KeyGenerator kgen=KeyGenerator.getInstance(“AES”);
SecureRandom sr=SecureRandom.getInstance(“SHA1PRNG”);
高级种子(种子);
//256bit AES密钥的初始化
kgen.init(Constants.AES_KEY_SIZE,sr);;
SecretKey secret=kgen.generateKey();
//获取秘密原始密钥
字节[]rawKey=secret.getEncoded();
返回rawKey;
*/
//新的关键方法与一些盐
SecureRandom=SecureRandom.getInstance(“SHA1PRNG”);
字节[]ransalt=新字节[20];
随机。下个字节(ransalt);
返回ransalt;
}
@凌驾
公共字节[]getRawKey(字节[]种子)引发异常{
/*旧方法
//初始化密钥生成器
KeyGenerator kgen=KeyGenerator.getInstance(“AES”);
SecureRandom sr=SecureRandom.getInstance(“SHA1PRNG”);
高级种子(种子);
//256bit AES密钥的初始化
kgen.init(常数.AES\u键大小,sr);
SecretKey secret=kgen.generateKey();
//获取秘密原始密钥
字节[]rawKey=secret.getEncoded();
返回rawKey;
*/
返回null;
}
/**
* 
*@param-tobedecode
*@返回
*/
公共字节[]base64已解码(字符串待编码){
字节[]decoded=Base64.decode(toBeDecoded,0);
返回解码;
}
//十六进制模式
公共字符串到十六进制(字符串txt){
返回到hex(txt.getBytes());
}
公共字符串fromHex(字符串十六进制){
返回新字符串(toByte(hex));
}
公共字节[]到字节(字符串hexString){
int len=hexString.length()/2;
字节[]结果=新字节[len];
对于(int i=0;i>4)和0x0f)).append(十六进制字符(b和0x0f));
}
}
我在Stackoverflow上引用/比较了以下代码: 及

似乎我的问题在于字符集编码,但我无法找出问题所在

非常感谢您的任何评论/回答!
谢谢你帮助我

我写的这段代码完美无瑕。请看下面的链接:

在不仔细查看代码的情况下,我建议您在此处指定编码,尽管我不确定这是否是问题的原因:

byte[] cipherText = cipher.doFinal(PlainMsg.getBytes());
在这里:

return new String(bCipherText);

我写的这段代码完美无瑕。请看下面的链接:

在不仔细查看代码的情况下,我建议您在此处指定编码,尽管我不确定这是否是问题的原因:

byte[] cipherText = cipher.doFinal(PlainMsg.getBytes());
在这里:

return new String(bCipherText);

谢谢,但是我已经尝试指定了编码方法,但是仍然无法得到正确的结果。然后我删除了所有的代码,并做了一个简单的重新编写,这一次同样的代码工作。