Android用户基础信息保存

客户端需要保存一些基础参数,像是token,userName之类的,单纯保存肯定不行,需要进行加密处理。
1.UserInfoHelper

public class UserInfoHelper {
    private static final String USER_INFO = "user_info";//文件名
    public static final String APP_SHA_256 = "***************************************";
    public static final String USER_TOKEN = "user_token";//token
    public static final String USER_CELL = "user_cell";//cell

    public static void saveData(Context context, String type, String data) {
        try {
            PreferenceHelper.saveData(context, USER_INFO, type, EncryptHelper.encrypt(APP_SHA_256, data));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static String getUserToken(Context context) {
        if (StringUtils.isBlank(PreferenceHelper.getData(context, USER_INFO, USER_TOKEN))) {
            return "";
        } else {
            try {
                return EncryptHelper.decrypt(APP_SHA_256, PreferenceHelper.getData(context, USER_INFO, USER_TOKEN));
            } catch (Exception e) {
                e.printStackTrace();
                return "";
            }
        }
    }
}

2.PreferenceHelper

public class PreferenceHelper {
    public PreferenceHelper() {
    }

    public static void saveData(Context context, String name, String key, String content) {
        SharedPreferences preferences = context.getSharedPreferences(name, 0);
        SharedPreferences.Editor editor = preferences.edit();
        editor.putString(key, content);
        editor.commit();
    }

    public static String getData(Context context, String name, String key) {
        SharedPreferences preferences = context.getSharedPreferences(name, 0);
        return preferences.getString(key, (String) null);
    }

    public static void saveData(Context context, String name, String key, boolean content) {
        SharedPreferences preferences = context.getSharedPreferences(name, 0);
        SharedPreferences.Editor editor = preferences.edit();
        editor.putBoolean(key, content);
        editor.commit();
    }

    public static boolean getData(Context context, String name, String key, boolean defValue) {
        SharedPreferences preferences = context.getSharedPreferences(name, 0);
        return preferences.getBoolean(key, defValue);
    }

    public static void clearData(Context context, String name, String key) {
        SharedPreferences preferences = context.getSharedPreferences(name, 0);
        SharedPreferences.Editor editor = preferences.edit();
        editor.putString(key, "");
        editor.commit();
    }

    public static void clearData(Context context, String name) {
        SharedPreferences preferences = context.getSharedPreferences(name, 0);
        SharedPreferences.Editor editor = preferences.edit();
        editor.clear();
        editor.commit();
    }
}

3.EncryptHelper

public static String encrypt(String seed, String cleartext) throws Exception {
        // byte[] rawKey = getRawKey(seed.getBytes());
        byte[] rawKey = toByte(seed);

        byte[] result = encrypt(rawKey, cleartext.getBytes());

        return Base64.encode(result);
    }

    public static String decrypt(String seed, String encrypted) throws Exception {
        // byte[] rawKey = getRawKey(seed.getBytes());
        byte[] rawKey = toByte(seed);
        // byte[] enc = toByte(encrypted);
        byte[] enc = Base64.decode(encrypted);
        byte[] result = decrypt(rawKey, enc);

        return new String(result);
    }

    private static byte[] getRawKey(byte[] seed) throws Exception {
        KeyGenerator kgen = KeyGenerator.getInstance("AES");
        SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
        sr.setSeed(seed);
        //用的是256的那个
        kgen.init(256, sr); // 192 and 256 bits may not be available
        SecretKey skey = kgen.generateKey();

        return skey.getEncoded();
        /*
         * return new byte[] { 0x08, 0x08, 0x04, 0x0b, 0x02, 0x0f, 0x0b, 0x0c,
		 * 0x01, 0x03, 0x09, 0x07, 0x0c, 0x03, 0x07, 0x0a, 0x04, 0x0f, 0x06,
		 * 0x0f, 0x0e, 0x09, 0x05, 0x01, 0x0a, 0x0a, 0x01, 0x09, 0x06, 0x07,
		 * 0x09, 0x0d };
		 */
    }

    private static 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 static 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 static String toHex(String txt) {
        return toHex(txt.getBytes());
    }

    public static String fromHex(String hex) {
        return new String(toByte(hex));
    }

    public static 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 static 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 static void appendHex(StringBuffer sb, byte b) {
        sb.append(HEX.charAt((b >> 4) & 0x0f)).append(HEX.charAt(b & 0x0f));
    }

    public static class Base64 {
        private static char[] legalChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray();

        public static String encode(byte[] data) {
            int start = 0;
            int len = data.length;
            StringBuffer buf = new StringBuffer(data.length * 3 / 2);

            int end = len - 3;
            int i = start;
            int n = 0;

            while (i <= end) {
                int d = ((((int) data[i]) & 0x0ff) << 16) | ((((int) data[i + 1]) & 0x0ff) << 8) | (((int) data[i + 2]) & 0x0ff);

                buf.append(legalChars[(d >> 18) & 63]);
                buf.append(legalChars[(d >> 12) & 63]);
                buf.append(legalChars[(d >> 6) & 63]);
                buf.append(legalChars[d & 63]);

                i += 3;

                if (n++ >= 14) {
                    n = 0;
                    buf.append(" ");
                }
            }

            if (i == start + len - 2) {
                int d = ((((int) data[i]) & 0x0ff) << 16) | ((((int) data[i + 1]) & 255) << 8);

                buf.append(legalChars[(d >> 18) & 63]);
                buf.append(legalChars[(d >> 12) & 63]);
                buf.append(legalChars[(d >> 6) & 63]);
                buf.append("=");
            } else if (i == start + len - 1) {
                int d = (((int) data[i]) & 0x0ff) << 16;

                buf.append(legalChars[(d >> 18) & 63]);
                buf.append(legalChars[(d >> 12) & 63]);
                buf.append("==");
            }

            return buf.toString();
        }

        private static int decode(char c) {
            if (c >= 'A' && c <= 'Z')
                return ((int) c) - 65;
            else if (c >= 'a' && c <= 'z')
                return ((int) c) - 97 + 26;
            else if (c >= '0' && c <= '9')
                return ((int) c) - 48 + 26 + 26;
            else
                switch (c) {
                    case '+':
                        return 62;
                    case '/':
                        return 63;
                    case '=':
                        return 0;
                    default:
                        throw new RuntimeException("unexpected code: " + c);
                }
        }

        public static byte[] decode(String s) {

            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            try {
                decode(s, bos);
            } catch (IOException e) {
                throw new RuntimeException();
            }
            byte[] decodedBytes = bos.toByteArray();
            try {
                bos.close();
                bos = null;
            } catch (IOException ex) {
                System.err.println("Error while decoding BASE64: " + ex.toString());
            }
            return decodedBytes;
        }

        private static void decode(String s, OutputStream os) throws IOException {
            int i = 0;

            int len = s.length();

            while (true) {
                while (i < len && s.charAt(i) <= ' ')
                    i++;

                if (i == len)
                    break;

                int tri = (decode(s.charAt(i)) << 18) + (decode(s.charAt(i + 1)) << 12) + (decode(s.charAt(i + 2)) << 6) + (decode(s.charAt(i + 3)));

                os.write((tri >> 16) & 255);
                if (s.charAt(i + 2) == '=')
                    break;
                os.write((tri >> 8) & 255);
                if (s.charAt(i + 3) == '=')
                    break;
                os.write(tri & 255);

                i += 4;
            }
        }
    }

一步到位,解决

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