flutter属于前端还是后端(kotlin比较flutter)

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尝试了网上多种库和教程都没办法互解，JAVA代码如下，求个大佬帮忙用dart(Flutter)实现一个可以互解的aes加密代码package com.example.lib;

import javax.crypto.Cipher;

import javax.crypto.spec.IvParameterSpec;

import javax.crypto.spec.SecretKeySpec;

public class Test {

static String keyStr = “620F15CFDB5C79C34B3940537B21EDA072E22F5D7151456DEC3932D7A2B22C53”;

static String ivStr = “85D7D7DA41E22C1A66C9C1BFC70A1088”;

public static void main(String[] args) {

String haha = encrypt(“哈哈！你好。”);//B7488CC936D5FF626F50900F99CEB2E13D99

decrypt(haha);

}

static String encrypt(String content) {

try {

byte[] ivByte = hex2byte(ivStr);

byte[] key = hex2byte(keyStr);

Cipher cipher = Cipher.getInstance(“AES/CFB/NoPadding”);

SecretKeySpec keySpec = new SecretKeySpec(key, “AES”);

IvParameterSpec ivSpec = new IvParameterSpec(ivByte);

cipher.init(1, keySpec, ivSpec);

byte[] doFinal = cipher.doFinal(content.getBytes(“UTF-8”));

System.out.println(“doFinale:” + byte2hex(doFinal));

return byte2hex(doFinal);

} catch (Exception e) {

e.printStackTrace();

return null;

}

}

static void decrypt(String content) {

try {

byte[] ivByte = hex2byte(ivStr);

byte[] contentByte = hex2byte(content);

byte[] key = hex2byte(keyStr);

Cipher cipher = Cipher.getInstance(“AES/CFB/NoPadding”);

SecretKeySpec keySpec = new SecretKeySpec(key, “AES”);

IvParameterSpec ivSpec = new IvParameterSpec(ivByte);

cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);

byte[] result = cipher.doFinal(contentByte);

System.out.println(new String(result, “UTF-8”));

} catch (Exception e) {

e.printStackTrace();

}

}

public static byte[] hex2byte(String str) {

if (str == null) {

return null;

}

int length = str.length();

if (length % 2 == 1) {

return null;

}

byte[] bArr = new byte[length / 2];

for (int i = 0; i != length / 2; i++) {

int j = i * 2;

bArr[i] = (byte) Integer.parseInt(str.substring(j, j + 2), 16);

}

return bArr;

}

public static String byte2hex(byte[] bArr) {

String str = “”;

for (byte b : bArr) {

String hexString = Integer.toHexString(b & 255);

str = hexString.length() == 1 ? str + “0” + hexString : str + hexString;

}

return str.toUpperCase();

}

}

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