Android - 字符串的加密和解密

转载请注明出处：https://blog.csdn.net/mythmayor/article/details/75257981

1.字符串的加密

    /**
     * 加密
     **/
    private String encryptPassword(String clearText) {
        try {
            DESKeySpec keySpec = new DESKeySpec(
                    MyConstant.PASSWORD_ENC_SECRET.getBytes("UTF-8"));
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
            SecretKey key = keyFactory.generateSecret(keySpec);

            Cipher cipher = Cipher.getInstance("DES");
            cipher.init(Cipher.ENCRYPT_MODE, key);
            String encrypedPwd = Base64.encodeToString(cipher.doFinal(clearText
                    .getBytes("UTF-8")), Base64.DEFAULT);
            return encrypedPwd;
        } catch (Exception e) {
        }
        return clearText;
    }

2.字符串的解密

    /**
     * 解密
     **/
    private String decryptPassword(String encryptedPwd) {
        try {
            DESKeySpec keySpec = new DESKeySpec(MyConstant.PASSWORD_ENC_SECRET.getBytes("UTF-8"));
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
            SecretKey key = keyFactory.generateSecret(keySpec);

            byte[] encryptedWithoutB64 = Base64.decode(encryptedPwd, Base64.DEFAULT);
            Cipher cipher = Cipher.getInstance("DES");
            cipher.init(Cipher.DECRYPT_MODE, key);
            byte[] plainTextPwdBytes = cipher.doFinal(encryptedWithoutB64);
            return new String(plainTextPwdBytes);
        } catch (Exception e) {
        }
        return encryptedPwd;
    }

备注：常量PASSWORD_ENC_SECRET可自行定义。

public class MyConstant {
    public static final String PASSWORD_ENC_SECRET = "mythmayor";
}

3.下载Demo

字符串加密和解密Demo下载