Go后端+iOS端+Android端的AES256加密方案（Android端）

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这是一个创建于的文章，其中的信息可能已经有所发展或是发生改变。

移动端与服务端通讯需要采用AES 256加密。

Androd客户端的实现代码为：


import android.util.Base64;

import java.io.UnsupportedEncodingException;
import java.security.Key;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

public class AESEncrypt {

    private static final String KEY_ALGORITHM = "AES";
    private static final String CIPHER_ALGORITHM = "AES/ECB/PKCS7Padding";

    public static String encrypt(String key, String data) {
        try {
            final Key keySpec = createKey(key);
            final Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM, "BC");
            cipher.init(Cipher.ENCRYPT_MODE, keySpec);
            final byte[] encoded = cipher.doFinal(data.getBytes("UTF-8"));
            return Base64.encodeToString(encoded, Base64.DEFAULT);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }


    public static String decrypt(String key, String data ) {
        try {
            final Key keySpec = createKey(key);
            final Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
            cipher.init(Cipher.DECRYPT_MODE, keySpec);
            final byte[] bytes = Base64.decode(data.getBytes("UTF-8"), Base64.DEFAULT);
            return new String(cipher.doFinal(bytes));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    private static Key createKey(String key) throws UnsupportedEncodingException, NoSuchAlgorithmException {
        final MessageDigest digest = MessageDigest.getInstance("SHA-256");
        final byte[] keyByte = digest.digest(key.getBytes("UTF-8"));
        return new SecretKeySpec(keyByte, KEY_ALGORITHM);
    }

}

加密结果通过Base64.Default方式转换为字符串

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