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Android 中采用 Base64 密钥加密的 AES

发布于 2025-01-03 04:24:58 字数 1084 浏览 3 评论 0原文

我正在制作一个Android应用程序，我应该在其中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，所以我使用了这个问题中询问的代码。我换了钥匙并用我的替换了它。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，我会收到错误“java.lang.IllegalArgumentException：bad base-64”，比如说“asdasdasd”在我加密时会出现此错误。谁能告诉我问题是什么？
-提前致谢

原文

I am making an android application in which I am supposed to encrypt the passwords I take from the user and send it to my app engine. I want to the use the AES technique with a Base64 key. I am new to encryption/decryption so i used the code asked in this question. I changed the key and replaced it with mine. This is my code:

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 "";
    }

But sometimes I get an error "java.lang.IllegalArgumentException: bad base-64" when i try to encrypt certain strings, say "asdasdasd" gives this error when i am encrypting it. Can anyone please tell me what the problem is??
-Thanks in advance

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评论（4）

花落人断肠 2025-01-10 04:24:58

尝试将此作为有关如何使用字符串作为键和消息的示例。至少它使用正确的（字符）编码，使用 CBC 模式和 PKCS5/7 填充。请注意，将加密的密码发送到服务器存在很多问题。通常，应通过在服务器上使用 SSL 来实现机密性并使用 bcrypt 或 PBKDF2 来实现安全性（但这已在 stackoverflow 上一次又一次地介绍）。

请注意，下面的代码不提供完整性检查或真实性
。

public static String encrypt(final String plainMessage,
        final String symKeyHex) {
    final byte[] symKeyData = DatatypeConverter.parseHexBinary(symKeyHex);

    final byte[] encodedMessage = plainMessage.getBytes(Charset
            .forName("UTF-8"));
    try {
        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 = DatatypeConverter
                .printBase64Binary(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);
    }
}

public static String decrypt(final String ivAndEncryptedMessageBase64,
        final String symKeyHex) {
    final byte[] symKeyData = DatatypeConverter.parseHexBinary(symKeyHex);

    final byte[] ivAndEncryptedMessage = DatatypeConverter
            .parseBase64Binary(ivAndEncryptedMessageBase64);
    try {
        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);
    }
}

Try this as an example on how to use Strings for keys and messages. At least it uses the right (character) encoding, uses CBC mode and PKCS5/7 padding. Note that there are a lot of issues with sending passwords encrypted to a server. Normally, security should be achieved by using SSL for confidentiallity and bcrypt or PBKDF2 on the server (but this has been covered again and again on stackoverflow).

Note that the code below does not provide integrity checks or authenticity
.

public static String encrypt(final String plainMessage,
        final String symKeyHex) {
    final byte[] symKeyData = DatatypeConverter.parseHexBinary(symKeyHex);

    final byte[] encodedMessage = plainMessage.getBytes(Charset
            .forName("UTF-8"));
    try {
        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 = DatatypeConverter
                .printBase64Binary(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);
    }
}

public static String decrypt(final String ivAndEncryptedMessageBase64,
        final String symKeyHex) {
    final byte[] symKeyData = DatatypeConverter.parseHexBinary(symKeyHex);

    final byte[] ivAndEncryptedMessage = DatatypeConverter
            .parseBase64Binary(ivAndEncryptedMessageBase64);
    try {
        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);
    }
}
回复 原文
乙白 2025-01-10 04:24:58

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));
}

  }

并在活动中请输入以下代码：

SimpleCrypto simpleCrypto = new SimpleCrypto();
    String s = "";
    try {
        s = simpleCrypto.encrypt("abc", "xyz");
    } catch (Exception e) {
        e.printStackTrace();
    }

abc 是要加密的文本， xyz 是加密的密钥

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));
}

  }

and in activity please put following code :

SimpleCrypto simpleCrypto = new SimpleCrypto();
    String s = "";
    try {
        s = simpleCrypto.encrypt("abc", "xyz");
    } catch (Exception e) {
        e.printStackTrace();
    }

abc is the text to be encrypt and xyz is the key for encryption

回复 原文
回首观望 2025-01-10 04:24:58

看看我在这里的答案Android数据库加密。它包含 2 个文件，您可以将它们包含在任何需要加密数据存储的应用程序中。有一个实现的方法可以更轻松地将字节数组数据转换为可打印的 Base64 数据，反之亦然。使用带有密码块链接 (CBC) 加密模式和 PKCS#5 填充的 AES 算法。

Look at my answer here Android database encryption. It contains 2 files that you can include in any of your applications that require data storage to be encrypted. There is implemented method that make it easier to convert the byte array data into printable Base64 data and vice versa. Used the AES algorithm with Cipher Block Chaining (CBC) encryption mode and PKCS#5 padding.

回复 原文
夏天碎花小短裙 2025-01-10 04:24:58

你好，我重写了 owlstead java 方法示例，没有使用 DatatypeConverter，而是使用 apache commons。

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 "";
}

你甚至不能在 android 上使用它，因为你可能会遇到 Base64 类的问题。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！

Hi i rewrite the owlstead java methods example without DatatypeConverter and with apache commons.

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 "";
}

You can not even use this on android because you could have some problem with Base64 Class. On android you could use the following methods that use Base64 android class:

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 "";
}

Hope this help!

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