android加密算法

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/** * 常用的加密算法 */public final class CryptUtil {    private CryptUtil(){}    ///////////////////////////////////////////////////////////////////////////    // DES    ///////////////////////////////////////////////////////////////////////////    /**     * DES 加密算法     * @param data 原始数据     * @param key 密码,必须是8个字节     * @return byte[] 经过加密之后的内容     */    public static byte[] desEncrypt(byte[] data, byte[] key){        byte[] ret = null;        if (data != null && key != null) {            if(data.length > 0 && key.length == 8){                // 1. 使用 Cipher 引擎 来初始化 加密,并且设置密码                try {                    Cipher cipher = Cipher.getInstance("DES");                    // 1.1 DESKeySpec 用于描述DES的密码                    DESKeySpec spec = new DESKeySpec(key);                    // 1.2 使用 SecretKeyFactory 生成 Key对象                    SecretKeyFactory factory = SecretKeyFactory.getInstance("DES");                    SecretKey sk = factory.generateSecret(spec);                    // 1.3 初始化 Cipher 为加密操作,并且指定密钥                    cipher.init(Cipher.ENCRYPT_MODE, sk);                    // 2. 加密数据                    ret = cipher.doFinal(data);                } catch (NoSuchAlgorithmException e) {                    e.printStackTrace();                } catch (NoSuchPaddingException e) {                    e.printStackTrace();                } catch (InvalidKeyException e) {                    e.printStackTrace();                } catch (InvalidKeySpecException e) {                    e.printStackTrace();                } catch (BadPaddingException e) {                    e.printStackTrace();                } catch (IllegalBlockSizeException e) {                    e.printStackTrace();                }            }        }        return ret;    }    /**     * DES 解密算法     * @param data 原始数据     * @param key 密码,必须是8个字节     * @return byte[] 经过解密之后的内容     */    public static byte[] desDecrypt(byte[] data, byte[] key){        byte[] ret = null;        if (data != null && key != null) {            if(data.length > 0 && key.length == 8){                // 1. 使用 Cipher 引擎 来初始化 解密,并且设置密码                try {                    Cipher cipher = Cipher.getInstance("DES");                    // 1.1 DESKeySpec 用于描述DES的密码                    DESKeySpec spec = new DESKeySpec(key);                    // 1.2 使用 SecretKeyFactory 生成 Key对象                    SecretKeyFactory factory = SecretKeyFactory.getInstance("DES");                    SecretKey sk = factory.generateSecret(spec);                    // 1.3 初始化 Cipher 为解密操作,并且指定密钥                    cipher.init(Cipher.DECRYPT_MODE, sk);                    // 2. 解密数据                    ret = cipher.doFinal(data);                } catch (NoSuchAlgorithmException e) {                    e.printStackTrace();                } catch (NoSuchPaddingException e) {                    e.printStackTrace();                } catch (InvalidKeyException e) {                    e.printStackTrace();                } catch (InvalidKeySpecException e) {                    e.printStackTrace();                } catch (BadPaddingException e) {                    e.printStackTrace();                } catch (IllegalBlockSizeException e) {                    e.printStackTrace();                }            }        }        return ret;    }    ///////////////////////////////////////////////////////////////////////////    // AES 方式1    ///////////////////////////////////////////////////////////////////////////    public static byte[] aesEncryptSimple(byte[] data, byte[] key){        byte[] ret = null;        if (data != null && key != null) {            if(data.length > 0 && key.length == 16){                // AES 128bit = 16bytes                try {                    Cipher cipher = Cipher.getInstance("AES");                    SecretKeySpec keySpec = new SecretKeySpec(key, "AES");                    cipher.init(Cipher.ENCRYPT_MODE, keySpec);                    ret = cipher.doFinal(data);                } catch (NoSuchAlgorithmException e) {                    e.printStackTrace();                } catch (NoSuchPaddingException e) {                    e.printStackTrace();                } catch (InvalidKeyException e) {                    e.printStackTrace();                } catch (BadPaddingException e) {                    e.printStackTrace();                } catch (IllegalBlockSizeException e) {                    e.printStackTrace();                }            }        }        return ret;    }    public static byte[] aesDecryptSimple(byte[] data, byte[] key){        byte[] ret = null;        if (data != null && key != null) {            if(data.length > 0 && key.length == 16){                // AES 128bit = 16bytes                try {                    Cipher cipher = Cipher.getInstance("AES");                    SecretKeySpec keySpec = new SecretKeySpec(key, "AES");                    cipher.init(Cipher.DECRYPT_MODE, keySpec);                    ret = cipher.doFinal(data);                } catch (NoSuchAlgorithmException e) {                    e.printStackTrace();                } catch (NoSuchPaddingException e) {                    e.printStackTrace();                } catch (InvalidKeyException e) {                    e.printStackTrace();                } catch (BadPaddingException e) {                    e.printStackTrace();                } catch (IllegalBlockSizeException e) {                    e.printStackTrace();                }            }        }        return ret;    }    ///////////////////////////////////////////////////////////////////////////    // AES 方式2 使用两套密码    ///////////////////////////////////////////////////////////////////////////    /**     * 使用两套密码的加密,强度更高     * @param data 数据     * @param key 第一个密码     * @param ivData 第二个密码     * @return byte[]     */    public static byte[] aesEncryptWithIv(byte[] data, byte[] key, byte[] ivData){        byte[] ret = null;        if (data != null && key != null && ivData != null) {            if(data.length > 0 && key.length == 16 && ivData.length == 16){                // 使用两套密码的,算法需要写成 AES/算法模式/填充模式                try {                    Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");                    // 准备第一套密码                    SecretKeySpec keySpec = new SecretKeySpec(key, "AES");                    // 准备第二套密码                    IvParameterSpec iv = new IvParameterSpec(ivData);                    // 设置两套密码的初始化                    cipher.init(Cipher.ENCRYPT_MODE, keySpec, iv);                    cipher.update(data);                    ret = cipher.doFinal();                } catch (NoSuchAlgorithmException e) {                    e.printStackTrace();                } catch (NoSuchPaddingException e) {                    e.printStackTrace();                } catch (InvalidAlgorithmParameterException e) {                    e.printStackTrace();                } catch (InvalidKeyException e) {                    e.printStackTrace();                } catch (BadPaddingException e) {                    e.printStackTrace();                } catch (IllegalBlockSizeException e) {                    e.printStackTrace();                }            }        }        return ret;    }    public static byte[] aesDecryptWithIv(byte[] data, byte[] key, byte[] ivData){        byte[] ret = null;        if (data != null && key != null && ivData != null) {            if(data.length > 0 && key.length == 16 && ivData.length == 16){                // 使用两套密码的,算法需要写成 AES/算法模式/填充模式                try {                    Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");                    // 准备第一套密码                    SecretKeySpec keySpec = new SecretKeySpec(key, "AES");                    // 准备第二套密码                    IvParameterSpec iv = new IvParameterSpec(ivData);                    // 设置两套密码的初始化                    cipher.init(Cipher.DECRYPT_MODE, keySpec, iv);                    cipher.update(data);                    ret = cipher.doFinal();                } catch (NoSuchAlgorithmException e) {                    e.printStackTrace();                } catch (NoSuchPaddingException e) {                    e.printStackTrace();                } catch (InvalidAlgorithmParameterException e) {                    e.printStackTrace();                } catch (InvalidKeyException e) {                    e.printStackTrace();                } catch (BadPaddingException e) {                    e.printStackTrace();                } catch (IllegalBlockSizeException e) {                    e.printStackTrace();                }            }        }        return ret;    }    ///////////////////////////////////////////////////////////////////////////    // RSA    ///////////////////////////////////////////////////////////////////////////    // 1. 生成密钥对 公钥和私钥    /**     *     * @param bits 必须在 1024,2048     * @return     */    public static KeyPair generateRsaKey(int bits){        KeyPair ret = null;        try {            KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");            kpg.initialize(bits);            ret = kpg.generateKeyPair();        } catch (NoSuchAlgorithmException e) {            e.printStackTrace();        }        return ret;    }    /**     * RSA加密,使用公钥加密,那么必须使用私钥解密     *         使用私钥机密,那么必须使用公钥解密     * @param data     * @param key     * @return     */    public static byte[] rsaEncrypt(byte[] data, Key key){        byte[] ret = null;        if (data != null && data.length > 0 && key != null) {            try {                Cipher cipher = Cipher.getInstance("RSA");                cipher.init(Cipher.ENCRYPT_MODE, key);                ret = cipher.doFinal(data);            } catch (NoSuchAlgorithmException e) {                e.printStackTrace();            } catch (NoSuchPaddingException e) {                e.printStackTrace();            } catch (InvalidKeyException e) {                e.printStackTrace();            } catch (BadPaddingException e) {                e.printStackTrace();            } catch (IllegalBlockSizeException e) {                e.printStackTrace();            }        }        return ret;    }    public static byte[] rsaDecrypt(byte[] data, Key key){        byte[] ret = null;        if (data != null && data.length > 0 && key != null) {            try {                Cipher cipher = Cipher.getInstance("RSA");                cipher.init(Cipher.DECRYPT_MODE, key);                ret = cipher.doFinal(data);            } catch (NoSuchAlgorithmException e) {                e.printStackTrace();            } catch (NoSuchPaddingException e) {                e.printStackTrace();            } catch (InvalidKeyException e) {                e.printStackTrace();            } catch (BadPaddingException e) {                e.printStackTrace();            } catch (IllegalBlockSizeException e) {                e.printStackTrace();            }        }        return ret;    }}

2.MainActivity

public class MainActivity extends AppCompatActivity {    private EditText mTextContent;    private TextView mTextResult;    private EditText mTextPassword;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mTextContent = (EditText) findViewById(R.id.txt_content);        mTextResult = (TextView) findViewById(R.id.txt_result);        mTextPassword = (EditText) findViewById(R.id.txt_password);    }    public void btnBase64Encode(View view) {        String str = mTextContent.getText().toString().trim();        // Base64 编码,NO_WRAP 代表编码的结果没有任何换行        String encoded = Base64.encodeToString(str.getBytes(), Base64.NO_WRAP);        mTextResult.setText(encoded);        // Base64 解码,        String es = "5pKS5Zyw5pa55Y+r6ICD5ouJ5rC05reA57KJ5Y2z5Y+v5ouJ5rC05reA57KJ5Y2z5Y+v55qE6aOO5pmv5Y2h5omL5py65Y+R55qE5Y2h5ouJ55qE";        byte[] decode = Base64.decode(es, Base64.NO_WRAP);        String ss = null;        try {            ss = new String(decode, "UTF-8");            Log.d("Base64", "ss = " + ss);        } catch (UnsupportedEncodingException e) {            e.printStackTrace();        }    }    public void btnUrlEncoding(View view) {        String str = "%B1%E4%D0%CE%BD%F0%B8%D5";        try {            String decode = URLDecoder.decode(str, "GBK");            Log.d("UE", "btnUrlEncoding: " + decode);        } catch (UnsupportedEncodingException e) {            e.printStackTrace();        }        // URLEncoder 编码内容为可以在网址上拼接的字符串        try {            String ss = URLEncoder.encode("张哥Very很帅", "UTF-8");            Log.d("UE", "btnUrlEncoding: ss = " + ss);        } catch (UnsupportedEncodingException e) {            e.printStackTrace();        }    }    /**     * GZIP 压缩、解压缩     *     * @param view     */    public void btnGzipTest(View view) {        String str = mTextContent.getText().toString().trim();        // 1. 压缩GZIP, GZIPOutputStream        ByteArrayOutputStream bout = new ByteArrayOutputStream();        try {            GZIPOutputStream gzOut = new GZIPOutputStream(bout);            gzOut.write(str.getBytes()); // 利用GZIPOutputStream 压缩,并且输出结果            gzOut.finish(); // 必须调用,在结束的时候,生成实际的压缩数据            gzOut.close();        } catch (IOException e) {            e.printStackTrace();        }        byte[] data = bout.toByteArray();        mTextResult.setText("内容长度:" + str.length() + "\n压缩大小: " + data.length);        String s = Arrays.toString(data);        Log.d("GZIP", "btnGzipTest: " + s);        // 解压缩 GZIPInputStream        ByteArrayInputStream bin = new ByteArrayInputStream(data);        try {            GZIPInputStream gzIn = new GZIPInputStream(bin);            ByteArrayOutputStream bo = new ByteArrayOutputStream();            byte[] buf = new byte[128];            int len;            while (true) {                len = gzIn.read(buf);                if (len == -1) {                    break;                }                bo.write(buf, 0, len);            }            byte[] bytes = bo.toByteArray();            String ss = new String(bytes);            Log.d("GZIP", "btnGzipTest: gzip ss = " + ss);        } catch (IOException e) {            e.printStackTrace();        }    }    public void btnDesTest(View view) {        // DES test        String str = mTextContent.getText().toString().trim();        String pwd = mTextPassword.getText().toString().trim();//        byte[] encrypt = CryptUtil.desEncrypt(str.getBytes(), pwd.getBytes());        byte[] iv = {23, 33, 2, 3, 3, 4, 6, 7, 1, 3, 3, 4, 4, 3, 4, 4};        byte[] encrypt = CryptUtil.aesEncryptWithIv(str.getBytes(), pwd.getBytes(), iv);        String s = Base64.encodeToString(encrypt, Base64.NO_WRAP);        mTextResult.setText(s);        // 解密,把Base64 字符串 还原并且解密        byte[] ed = Base64.decode(s, Base64.NO_WRAP);//        byte[] data = CryptUtil.desDecrypt(ed, pwd.getBytes());        byte[] data = CryptUtil.aesDecryptWithIv(ed, pwd.getBytes(), iv);        String ss = new String(data);        Log.d("DES", "btnDesTest: " + ss);    }    public void btnRsaTest(View view) {        // 1. 加载/生成 密钥对        KeyPair keyPair = CryptUtil.generateRsaKey(1024);        // 私钥        PrivateKey aPrivate = keyPair.getPrivate();        // 公钥        PublicKey aPublic = keyPair.getPublic();        // TODO: 把公钥、私钥 使用 Base64编码,保存到文件中;下一次启动的时候,需要先加载,没有才创建        // 私钥的数据格式        byte[] privEncoded = aPrivate.getEncoded();        // 公钥的数据格式        byte[] pubEncoded = aPublic.getEncoded();        String str = mTextContent.getText().toString().trim();        byte[] encrypt = CryptUtil.rsaEncrypt(str.getBytes(), aPublic);        String es = Base64.encodeToString(encrypt, Base64.NO_WRAP);        mTextResult.setText(es);        byte[] dd = Base64.decode(es, Base64.NO_WRAP);        byte[] data = CryptUtil.rsaDecrypt(dd, aPrivate);        String s = new String(data);        Log.d("RSA", "btnRsaTest: " + s);    }}


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