Java android中使用Base64密钥加密的AES_Java_Android_Encryption_Base64_Aes

Java android中使用Base64密钥加密的AES

java android encryption

Java android中使用Base64密钥加密的AES,java,android,encryption,base64,aes,Java,Android,Encryption,Base64,Aes,我正在制作一个android应用程序，其中我应该加密从用户那里获取的密码并将其发送到我的应用程序引擎。我想使用带有Base64密钥的AES技术。我是加密/解密新手，所以我使用了本文中要求的代码。我换了钥匙，换上了我的。这是我的代码： public String encrypt(String dataToEncrypt) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidK

我正在制作一个android应用程序，其中我应该加密从用户那里获取的密码并将其发送到我的应用程序引擎。我想使用带有Base64密钥的AES技术。我是加密/解密新手，所以我使用了本文中要求的代码。我换了钥匙，换上了我的。这是我的代码：

public String encrypt(String dataToEncrypt)
            throws NoSuchAlgorithmException, NoSuchPaddingException,
            InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
        // I'm using AES encription

        if (!dataToEncrypt.equals("")) {
            String key = "rEqrHrhdd9I1sg==";

            Cipher c = Cipher.getInstance("AES");
            SecretKeySpec k;
            try {
                k = new SecretKeySpec(key.getBytes(), "AES");
                c.init(Cipher.ENCRYPT_MODE, k);
            } catch (Exception e) {
                e.printStackTrace();
            }

            return new String(c.doFinal(Base64.decode(dataToEncrypt, 0)));
        }
        return "";
    }

但有时，当我尝试加密某些字符串时，会出现错误“java.lang.IllegalArgumentException:bad base-64”，比如说“asdasdasd”在加密时会出现此错误。谁能告诉我是什么问题吗？？
-提前感谢

simplecrypto.java

     import java.security.SecureRandom;
     import javax.crypto.Cipher;
     import javax.crypto.KeyGenerator;
     import javax.crypto.SecretKey;
     import javax.crypto.spec.SecretKeySpec;

     public class SimpleCrypto {

public  String encrypt(String seed, String cleartext) throws Exception {
        byte[] rawKey = getRawKey(seed.getBytes());
        byte[] result = encrypt(rawKey, cleartext.getBytes());
        return toHex(result);
}

public  String decrypt(String seed, String encrypted) throws Exception {
        byte[] rawKey = getRawKey(seed.getBytes());
        byte[] enc = toByte(encrypted);
        byte[] result = decrypt(rawKey, enc);
        return new String(result);
}

//done
private  byte[] getRawKey(byte[] seed) throws Exception {
        KeyGenerator kgen = KeyGenerator.getInstance("AES");
        SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
        sr.setSeed(seed);
    kgen.init(128, sr); // 192 and 256 bits may not be available
    SecretKey skey = kgen.generateKey();
    byte[] raw = skey.getEncoded();
    return raw;
}


private  byte[] encrypt(byte[] raw, byte[] clear) throws Exception {
    SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
        Cipher cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
    byte[] encrypted = cipher.doFinal(clear);
        return encrypted;
}

private  byte[] decrypt(byte[] raw, byte[] encrypted) throws Exception {
    SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
        Cipher cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.DECRYPT_MODE, skeySpec);
    byte[] decrypted = cipher.doFinal(encrypted);
        return decrypted;
}

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 static String HEX = "0123456789ABCDEF";
private  void appendHex(StringBuffer sb, byte b) {
        sb.append(HEX.charAt((b>>4)&0x0f)).append(HEX.charAt(b&0x0f));
}

  }

abc是要加密的文本，xyz是加密的密钥

请尝试以下示例，了解如何使用字符串作为密钥和消息。至少它使用了右（字符）编码，使用CBC模式和PKCS5/7填充。请注意，将加密密码发送到服务器时存在很多问题。通常，安全性应该通过在服务器上使用SSL实现机密性和bcrypt或PBKDF2来实现（但stackoverflow一次又一次地介绍了这一点）

请注意，下面的代码不提供完整性检查或真实性

看看我的答案。它包含2个文件，您可以将其包含在任何需要加密数据存储的应用程序中。有一种实现的方法可以更容易地将字节数组数据转换为可打印的Base64数据，反之亦然。使用带密码块链接（CBC）加密模式和PKCS#5填充的AES算法。

嗨，我重写了不带DatatypeConverter和apache commons的owlstead java方法示例

public static String encrypt(final String plainMessage,
        final String symKeyHex) {


    try {

    final byte[] symKeyData = Hex.decodeHex(symKeyHex.toCharArray());

    final byte[] encodedMessage = plainMessage.getBytes(Charset.forName("UTF-8"));

        final Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        final int blockSize = cipher.getBlockSize();

        // create the key
        final SecretKeySpec symKey = new SecretKeySpec(symKeyData, "AES");

        // generate random IV using block size (possibly create a method for
        // this)
        final byte[] ivData = new byte[blockSize];
        final SecureRandom rnd = SecureRandom.getInstance("SHA1PRNG");
        rnd.nextBytes(ivData);
        final IvParameterSpec iv = new IvParameterSpec(ivData);

        cipher.init(Cipher.ENCRYPT_MODE, symKey, iv);

        final byte[] encryptedMessage = cipher.doFinal(encodedMessage);

        // concatenate IV and encrypted message
        final byte[] ivAndEncryptedMessage = new byte[ivData.length
                + encryptedMessage.length];
        System.arraycopy(ivData, 0, ivAndEncryptedMessage, 0, blockSize);
        System.arraycopy(encryptedMessage, 0, ivAndEncryptedMessage,
                blockSize, encryptedMessage.length);

        final String ivAndEncryptedMessageBase64 = Base64.encodeBase64String(ivAndEncryptedMessage);

        return ivAndEncryptedMessageBase64;
    } catch (InvalidKeyException e) {
        throw new IllegalArgumentException(
                "key argument does not contain a valid AES key");
    } catch (GeneralSecurityException e) {
        throw new IllegalStateException(
                "Unexpected exception during encryption", e);
    } catch (DecoderException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return "";

}

public static String decrypt(final String ivAndEncryptedMessageBase64,
        final String symKeyHex) {

    try {
        final byte[] symKeyData = Hex.decodeHex(symKeyHex.toCharArray());
        final byte[] ivAndEncryptedMessage = Base64.decodeBase64(ivAndEncryptedMessageBase64);


        final Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        final int blockSize = cipher.getBlockSize();

        // create the key
        final SecretKeySpec symKey = new SecretKeySpec(symKeyData, "AES");

        // retrieve random IV from start of the received message
        final byte[] ivData = new byte[blockSize];
        System.arraycopy(ivAndEncryptedMessage, 0, ivData, 0, blockSize);
        final IvParameterSpec iv = new IvParameterSpec(ivData);

        // retrieve the encrypted message itself
        final byte[] encryptedMessage = new byte[ivAndEncryptedMessage.length
                - blockSize];
        System.arraycopy(ivAndEncryptedMessage, blockSize,
                encryptedMessage, 0, encryptedMessage.length);

        cipher.init(Cipher.DECRYPT_MODE, symKey, iv);

        final byte[] encodedMessage = cipher.doFinal(encryptedMessage);

        // concatenate IV and encrypted message
        final String message = new String(encodedMessage,
                Charset.forName("UTF-8"));

        return message;
    } catch (InvalidKeyException e) {
        throw new IllegalArgumentException(
                "key argument does not contain a valid AES key");
    } catch (BadPaddingException e) {
        // you'd better know about padding oracle attacks
        return null;
    } catch (GeneralSecurityException e) {
        throw new IllegalStateException(
                "Unexpected exception during decryption", e);
    } catch (DecoderException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return "";
}

您甚至不能在android上使用它，因为Base64类可能会有一些问题。在android上，您可以使用以下使用Base64 android类的方法：

public static String encrypt(final String plainMessage,
                             final String symKeyHex) {


    try {

        final byte[] symKeyData = Hex.decodeHex(symKeyHex.toCharArray());

        final byte[] encodedMessage = plainMessage.getBytes(Charset.forName("UTF-8"));

        final Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        final int blockSize = cipher.getBlockSize();

        // create the key
        final SecretKeySpec symKey = new SecretKeySpec(symKeyData, "AES");

        // generate random IV using block size (possibly create a method for
        // this)
        final byte[] ivData = new byte[blockSize];
        final SecureRandom rnd = SecureRandom.getInstance("SHA1PRNG");
        rnd.nextBytes(ivData);
        final IvParameterSpec iv = new IvParameterSpec(ivData);

        cipher.init(Cipher.ENCRYPT_MODE, symKey, iv);

        final byte[] encryptedMessage = cipher.doFinal(encodedMessage);

        // concatenate IV and encrypted message
        final byte[] ivAndEncryptedMessage = new byte[ivData.length
                + encryptedMessage.length];
        System.arraycopy(ivData, 0, ivAndEncryptedMessage, 0, blockSize);
        System.arraycopy(encryptedMessage, 0, ivAndEncryptedMessage,
                blockSize, encryptedMessage.length);

        //final String ivAndEncryptedMessageBase64 = Base64.encodeBase64String(ivAndEncryptedMessage);
        final String ivAndEncryptedMessageBase64 = Base64.encodeToString(ivAndEncryptedMessage,Base64.DEFAULT);

        return ivAndEncryptedMessageBase64;
    } catch (InvalidKeyException e) {
        throw new IllegalArgumentException(
                "key argument does not contain a valid AES key");
    } catch (GeneralSecurityException e) {
        throw new IllegalStateException(
                "Unexpected exception during encryption", e);
    } catch (DecoderException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return "";

}

public static String decrypt(final String ivAndEncryptedMessageBase64,
                             final String symKeyHex) {


    try {

        final byte[] symKeyData = Hex.decodeHex(symKeyHex.toCharArray());
        //final byte[] ivAndEncryptedMessage = Base64.decodeBase64(ivAndEncryptedMessageBase64);
        final byte[] ivAndEncryptedMessage = Base64.decode(ivAndEncryptedMessageBase64,Base64.DEFAULT);

        final Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        final int blockSize = cipher.getBlockSize();

        // create the key
        final SecretKeySpec symKey = new SecretKeySpec(symKeyData, "AES");

        // retrieve random IV from start of the received message
        final byte[] ivData = new byte[blockSize];
        System.arraycopy(ivAndEncryptedMessage, 0, ivData, 0, blockSize);
        final IvParameterSpec iv = new IvParameterSpec(ivData);

        // retrieve the encrypted message itself
        final byte[] encryptedMessage = new byte[ivAndEncryptedMessage.length
                - blockSize];
        System.arraycopy(ivAndEncryptedMessage, blockSize,
                encryptedMessage, 0, encryptedMessage.length);

        cipher.init(Cipher.DECRYPT_MODE, symKey, iv);

        final byte[] encodedMessage = cipher.doFinal(encryptedMessage);

        // concatenate IV and encrypted message
        final String message = new String(encodedMessage,
                Charset.forName("UTF-8"));

        return message;
    } catch (InvalidKeyException e) {
        throw new IllegalArgumentException(
                "key argument does not contain a valid AES key");
    } catch (BadPaddingException e) {
        // you'd better know about padding oracle attacks
        return null;
    } catch (GeneralSecurityException e) {
        throw new IllegalStateException(
                "Unexpected exception during decryption", e);
    } catch (DecoderException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return "";
}

希望这有帮助

如果您有任何疑问，请告诉我。是的，这对我很有用。但我有一个疑问。事实上，我的朋友们也在做同样的加密工作，但他们得到的结果与我的不同。你能确切地告诉我这是哪种加密/解密技术吗？加密字符串有特殊格式吗？？我需要发送哪些参数来解密（）？？解密（，）正确吗？是的，我理解，但这是哪种技术？？我的意思是，即使是我在iOS上工作的朋友也在使用与我相同的键值，但他们得到的结果不同。这个答案中的一切都是错误的。密钥派生，有编码问题，列表还在继续。我已经给出了答案，作为一个新的代码示例，但不是每个使用base 64字符集的字符串都自动使用base 64，如果最后一个字符设置了一些低阶位，并且字符串不能被4整除，那么您就遇到了问题。此外，您可能还必须使用基数为64的填充字符（

'='

）。Antromet进展如何，您找到解决方案了吗？如果讨论有点混乱，我很抱歉：）嘿，Owlstead，我真的被加密解密的实验激怒了，这不是我喜欢的。所以我用散列来存储我的密码。无论如何，这可能更好。您可能希望签出PBKDF2或bcrypt来更安全地存储它们（它们可以防止暴力攻击和彩虹表）。当然，它们的使用也稍微困难一些。Android的

DatatypeConverter

有什么替代方案。我试着使用Base64.decode方法，但没有达到预期的效果..我看不出你的机器上发生了什么，YuDroid。请用

DatatypeConverter

的代码和

Base64的代码创建一个新问题。解码

，输入和输出，以便我们看到差异。

public static String encrypt(final String plainMessage,
        final String symKeyHex) {


    try {

    final byte[] symKeyData = Hex.decodeHex(symKeyHex.toCharArray());

    final byte[] encodedMessage = plainMessage.getBytes(Charset.forName("UTF-8"));

        final Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        final int blockSize = cipher.getBlockSize();

        // create the key
        final SecretKeySpec symKey = new SecretKeySpec(symKeyData, "AES");

        // generate random IV using block size (possibly create a method for
        // this)
        final byte[] ivData = new byte[blockSize];
        final SecureRandom rnd = SecureRandom.getInstance("SHA1PRNG");
        rnd.nextBytes(ivData);
        final IvParameterSpec iv = new IvParameterSpec(ivData);

        cipher.init(Cipher.ENCRYPT_MODE, symKey, iv);

        final byte[] encryptedMessage = cipher.doFinal(encodedMessage);

        // concatenate IV and encrypted message
        final byte[] ivAndEncryptedMessage = new byte[ivData.length
                + encryptedMessage.length];
        System.arraycopy(ivData, 0, ivAndEncryptedMessage, 0, blockSize);
        System.arraycopy(encryptedMessage, 0, ivAndEncryptedMessage,
                blockSize, encryptedMessage.length);

        final String ivAndEncryptedMessageBase64 = Base64.encodeBase64String(ivAndEncryptedMessage);

        return ivAndEncryptedMessageBase64;
    } catch (InvalidKeyException e) {
        throw new IllegalArgumentException(
                "key argument does not contain a valid AES key");
    } catch (GeneralSecurityException e) {
        throw new IllegalStateException(
                "Unexpected exception during encryption", e);
    } catch (DecoderException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return "";

}

public static String decrypt(final String ivAndEncryptedMessageBase64,
        final String symKeyHex) {

    try {
        final byte[] symKeyData = Hex.decodeHex(symKeyHex.toCharArray());
        final byte[] ivAndEncryptedMessage = Base64.decodeBase64(ivAndEncryptedMessageBase64);


        final Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        final int blockSize = cipher.getBlockSize();

        // create the key
        final SecretKeySpec symKey = new SecretKeySpec(symKeyData, "AES");

        // retrieve random IV from start of the received message
        final byte[] ivData = new byte[blockSize];
        System.arraycopy(ivAndEncryptedMessage, 0, ivData, 0, blockSize);
        final IvParameterSpec iv = new IvParameterSpec(ivData);

        // retrieve the encrypted message itself
        final byte[] encryptedMessage = new byte[ivAndEncryptedMessage.length
                - blockSize];
        System.arraycopy(ivAndEncryptedMessage, blockSize,
                encryptedMessage, 0, encryptedMessage.length);

        cipher.init(Cipher.DECRYPT_MODE, symKey, iv);

        final byte[] encodedMessage = cipher.doFinal(encryptedMessage);

        // concatenate IV and encrypted message
        final String message = new String(encodedMessage,
                Charset.forName("UTF-8"));

        return message;
    } catch (InvalidKeyException e) {
        throw new IllegalArgumentException(
                "key argument does not contain a valid AES key");
    } catch (BadPaddingException e) {
        // you'd better know about padding oracle attacks
        return null;
    } catch (GeneralSecurityException e) {
        throw new IllegalStateException(
                "Unexpected exception during decryption", e);
    } catch (DecoderException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return "";
}

public static String encrypt(final String plainMessage,
                             final String symKeyHex) {


    try {

        final byte[] symKeyData = Hex.decodeHex(symKeyHex.toCharArray());

        final byte[] encodedMessage = plainMessage.getBytes(Charset.forName("UTF-8"));

        final Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        final int blockSize = cipher.getBlockSize();

        // create the key
        final SecretKeySpec symKey = new SecretKeySpec(symKeyData, "AES");

        // generate random IV using block size (possibly create a method for
        // this)
        final byte[] ivData = new byte[blockSize];
        final SecureRandom rnd = SecureRandom.getInstance("SHA1PRNG");
        rnd.nextBytes(ivData);
        final IvParameterSpec iv = new IvParameterSpec(ivData);

        cipher.init(Cipher.ENCRYPT_MODE, symKey, iv);

        final byte[] encryptedMessage = cipher.doFinal(encodedMessage);

        // concatenate IV and encrypted message
        final byte[] ivAndEncryptedMessage = new byte[ivData.length
                + encryptedMessage.length];
        System.arraycopy(ivData, 0, ivAndEncryptedMessage, 0, blockSize);
        System.arraycopy(encryptedMessage, 0, ivAndEncryptedMessage,
                blockSize, encryptedMessage.length);

        //final String ivAndEncryptedMessageBase64 = Base64.encodeBase64String(ivAndEncryptedMessage);
        final String ivAndEncryptedMessageBase64 = Base64.encodeToString(ivAndEncryptedMessage,Base64.DEFAULT);

        return ivAndEncryptedMessageBase64;
    } catch (InvalidKeyException e) {
        throw new IllegalArgumentException(
                "key argument does not contain a valid AES key");
    } catch (GeneralSecurityException e) {
        throw new IllegalStateException(
                "Unexpected exception during encryption", e);
    } catch (DecoderException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return "";

}

public static String decrypt(final String ivAndEncryptedMessageBase64,
                             final String symKeyHex) {


    try {

        final byte[] symKeyData = Hex.decodeHex(symKeyHex.toCharArray());
        //final byte[] ivAndEncryptedMessage = Base64.decodeBase64(ivAndEncryptedMessageBase64);
        final byte[] ivAndEncryptedMessage = Base64.decode(ivAndEncryptedMessageBase64,Base64.DEFAULT);

        final Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        final int blockSize = cipher.getBlockSize();

        // create the key
        final SecretKeySpec symKey = new SecretKeySpec(symKeyData, "AES");

        // retrieve random IV from start of the received message
        final byte[] ivData = new byte[blockSize];
        System.arraycopy(ivAndEncryptedMessage, 0, ivData, 0, blockSize);
        final IvParameterSpec iv = new IvParameterSpec(ivData);

        // retrieve the encrypted message itself
        final byte[] encryptedMessage = new byte[ivAndEncryptedMessage.length
                - blockSize];
        System.arraycopy(ivAndEncryptedMessage, blockSize,
                encryptedMessage, 0, encryptedMessage.length);

        cipher.init(Cipher.DECRYPT_MODE, symKey, iv);

        final byte[] encodedMessage = cipher.doFinal(encryptedMessage);

        // concatenate IV and encrypted message
        final String message = new String(encodedMessage,
                Charset.forName("UTF-8"));

        return message;
    } catch (InvalidKeyException e) {
        throw new IllegalArgumentException(
                "key argument does not contain a valid AES key");
    } catch (BadPaddingException e) {
        // you'd better know about padding oracle attacks
        return null;
    } catch (GeneralSecurityException e) {
        throw new IllegalStateException(
                "Unexpected exception during decryption", e);
    } catch (DecoderException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return "";
}