Android 各种加密

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AES 128 加密

// 加密 AES 128 ECB PKCS7    public static String AES128_Encrypt(String sSrc, String sKey) throws Exception {        if (sKey == null) {            System.out.print("Key为空null");            return null;        }        // 判断Key是否为16位//        if (sKey.length() != 16) {//            System.out.print("Key长度不是16位");//            return null;//        }        byte[] raw = sKey.getBytes("utf-8");        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS7Padding");//"算法/模式/补码方式"        cipher.init(Cipher.ENCRYPT_MODE, skeySpec);        byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));        return new String(Base64.encode(encrypted, Base64.NO_WRAP),"utf-8");//        return new Base64().encodeToString(encrypted);//此处使用BASE64做转码功能，同时能起到2次加密的作用。    }    // 解密    public static String AES128_Decrypt(String sSrc, String sKey) throws Exception {        try {            // 判断Key是否正确            if (sKey == null) {                System.out.print("Key为空null");                return null;            }            // 判断Key是否为16位//            if (sKey.length() != 16) {//                System.out.print("Key长度不是16位");//                return null;//            }            byte[] raw = sKey.getBytes("utf-8");            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");            cipher.init(Cipher.DECRYPT_MODE, skeySpec);//            byte[] encrypted1 = new Base64().decode(sSrc);//先用base64解密            byte[] encrypted1 =  Base64.decode(sSrc, Base64.NO_WRAP);            try {                byte[] original = cipher.doFinal(encrypted1);                String originalString = new String(original,"utf-8");                return originalString;            } catch (Exception e) {                System.out.println(e.toString());                return null;            }        } catch (Exception ex) {            System.out.println(ex.toString());            return null;        }    }

MD5加密

  public static String  MD5Encrypt(String plaintext) {        char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',                'a', 'b', 'c', 'd', 'e', 'f' };        try {            byte[] btInput = plaintext.getBytes();            // 获得MD5摘要算法的 MessageDigest 对象            MessageDigest mdInst = MessageDigest.getInstance("MD5");            // 使用指定的字节更新摘要            mdInst.update(btInput);            // 获得密文            byte[] md = mdInst.digest();            // 把密文转换成十六进制的字符串形式            int j = md.length;            char str[] = new char[j * 2];            int k = 0;            for (int i = 0; i < j; i++) {                byte byte0 = md[i];                str[k++] = hexDigits[byte0 >>> 4 & 0xf];                str[k++] = hexDigits[byte0 & 0xf];            }            return new String(str);        } catch (Exception e) {            return null;        }    }

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