由於業務需求，需要實現在客戶端對重要信息進行加密，在服務端進行解密。客戶端包括IOS和安卓的 服務端位Java。

註意密鑰 需要保持一致，可以自己定義 。

安卓端加密代碼：

=====================================================================================================================

import android.util.Base64;

import java.io.UnsupportedEncodingException;
import java.security.InvalidAlgorithmParameterException;
 
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

 
public class SymmetricEncoder {

    private static final String IV_STRING = "A-16-Byte-String";
    private static final String charset = "UTF-8";

    /**
     *
     * @param content 要加密的內容
     * @param key     16位加密密鑰
     * @return
     * @throws Exception
     */
    public static String aesEncryptHexStr(String content, String key) throws
 
 Exception
    {
        return str2HexStr(aesEncryptString(content,key));
    }
    public static String aesEncryptString(String content, String key) throws InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException {
        byte[] contentBytes = content.getBytes(charset);
        byte[] keyBytes = key.getBytes(charset);
        byte[] encryptedBytes = aesEncryptBytes(contentBytes, keyBytes);
        return Base64.encodeToString(encryptedBytes, Base64.NO_WRAP);
    }

    /**
     * 字符串轉換成十六進制字符串
     * @return String 每個Byte之間空格分隔，如: [61 6C 6B]
     */
    public static String str2HexStr(String str)
    {

        char[] chars = "0123456789ABCDEF".toCharArray();
        StringBuilder sb = new StringBuilder("");
        byte[] bs = str.getBytes();
        int bit;

        for (int i = 0; i < bs.length; i++)
        {
            bit = (bs[i] & 0x0f0) >> 4;
            sb.append(chars[bit]);
            bit = bs[i] & 0x0f;
            sb.append(chars[bit]);
        }
        return sb.toString().trim();
    }
    public static String aesDecryptString(String content, String key) throws InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException {
        byte[] encryptedBytes = Base64.decode(content.getBytes(), Base64.NO_WRAP);
        byte[] keyBytes = key.getBytes(charset);
        byte[] decryptedBytes = aesDecryptBytes(encryptedBytes, keyBytes);
        return new String(decryptedBytes, charset);
    }

    public static byte[] aesEncryptBytes(byte[] contentBytes, byte[] keyBytes) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException {
        return cipherOperation(contentBytes, keyBytes, Cipher.ENCRYPT_MODE);
    }

    public static byte[] aesDecryptBytes(byte[] contentBytes, byte[] keyBytes) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException {
        return cipherOperation(contentBytes, keyBytes, Cipher.DECRYPT_MODE);
    }

    private static byte[] cipherOperation(byte[] contentBytes, byte[] keyBytes, int mode) throws UnsupportedEncodingException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException {
        SecretKeySpec secretKey = new SecretKeySpec(keyBytes, "AES");

        byte[] initParam = IV_STRING.getBytes(charset);
        IvParameterSpec ivParameterSpec = new IvParameterSpec(initParam);

        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        cipher.init(mode, secretKey, ivParameterSpec);

        return cipher.doFinal(contentBytes);
    }

    public static void main(String args[]){
        try {
            // 要加密的內容 加密的密鑰
            SymmetricEncoder.aesEncryptHexStr("xiaoming9999","ABCDEFGHIJKLMNOP");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

IOS 端加密:

=====================================================================================================================

//  AESCipher.h
#import <Foundation/Foundation.h>

NSString * aesEncryptString(NSString *content, NSString *key);
NSString * aesEncryptHexStr(NSString *content, NSString *key);//16進制表現形式
NSString * aesDecryptString(NSString *content, NSString *key);
NSString * hexStringFromString(NSString *string);


NSData * aesEncryptData(NSData *data, NSData *key);
NSData * aesDecryptData(NSData *data, NSData *key);

//
//  AESCipher.m
//  AESCipher
//

#import "AESCipher.h"
#import <CommonCrypto/CommonCryptor.h>

NSString const *kInitVector = @"A-16-Byte-String";
size_t const kKeySize = kCCKeySizeAES128;

NSData * cipherOperation(NSData *contentData, NSData *keyData, CCOperation operation) {
    NSUInteger dataLength = contentData.length;
    
    void const *initVectorBytes = [kInitVector dataUsingEncoding:NSUTF8StringEncoding].bytes;
    void const *contentBytes = contentData.bytes;
    void const *keyBytes = keyData.bytes;
    
    size_t operationSize = dataLength + kCCBlockSizeAES128;
    void *operationBytes = malloc(operationSize);
    size_t actualOutSize = 0;
    
    CCCryptorStatus cryptStatus = CCCrypt(operation,
                                          kCCAlgorithmAES,
                                          kCCOptionPKCS7Padding,
                                          keyBytes,
                                          kKeySize,
                                          initVectorBytes,
                                          contentBytes,
                                          dataLength,
                                          operationBytes,
                                          operationSize,
                                          &actualOutSize);
    
    if (cryptStatus == kCCSuccess) {
        return [NSData dataWithBytesNoCopy:operationBytes length:actualOutSize];
    }
    free(operationBytes);
    return nil;
}

NSString * aesEncryptString(NSString *content, NSString *key) {
    NSData *contentData = [content dataUsingEncoding:NSUTF8StringEncoding];
    NSData *keyData = [key dataUsingEncoding:NSUTF8StringEncoding];
    NSData *encrptedData = aesEncryptData(contentData, keyData);
    return [encrptedData base64EncodedStringWithOptions:NSDataBase64EncodingEndLineWithLineFeed];
}

NSString * aesEncryptHexStr(NSString *content, NSString *key){
   NSString *str=aesDecryptString(content,key);
   return hexStringFromString(str);
}

//普通字符串轉換為十六進制的。
NSString * hexStringFromString(NSString *string){
    NSData *myD = [string dataUsingEncoding:NSUTF8StringEncoding];
    Byte *bytes = (Byte *)[myD bytes];
    //下面是Byte 轉換為16進制。
    NSString *hexStr=@"";
    for(int i=0;i<[myD length];i++)
    {
        NSString *newHexStr = [NSString stringWithFormat:@"%x",bytes[i]&0xff];///16進制數
        if([newHexStr length]==1)
            hexStr = [NSString stringWithFormat:@"%@0%@",hexStr,newHexStr];
        else
            hexStr = [NSString stringWithFormat:@"%@%@",hexStr,newHexStr];
    }
    return hexStr;
}

NSString * aesDecryptString(NSString *content, NSString *key) {
    NSData *contentData = [[NSData alloc] initWithBase64EncodedString:content options:NSDataBase64DecodingIgnoreUnknownCharacters];
    NSData *keyData = [key dataUsingEncoding:NSUTF8StringEncoding];
    NSData *decryptedData = aesDecryptData(contentData, keyData);
    return [[NSString alloc] initWithData:decryptedData encoding:NSUTF8StringEncoding];
}

NSData * aesEncryptData(NSData *contentData, NSData *keyData) {
    NSString *hint = [NSString stringWithFormat:@"The key size of AES-%lu should be %lu bytes!", kKeySize * 8, kKeySize];
    NSCAssert(keyData.length == kKeySize, hint);
    return cipherOperation(contentData, keyData, kCCEncrypt);
}

NSData * aesDecryptData(NSData *contentData, NSData *keyData) {
    NSString *hint = [NSString stringWithFormat:@"The key size of AES-%lu should be %lu bytes!", kKeySize * 8, kKeySize];
    NSCAssert(keyData.length == kKeySize, hint);
    return cipherOperation(contentData, keyData, kCCDecrypt);
}

調用方式：

1、引入#import "AESCipher.h" 文件

2、

NSString *userID = aesEncryptHexStr([NSString stringWithFormat:@"%@;%@",userID,userPassword],@"ABCDEFGHIJKLMNOP");

JAVA服務端解密：

=====================================================================================================================

import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import java.io.UnsupportedEncodingException;

public class SymmetricEncoder {

    private static final String IV_STRING = "A-16-Byte-String";
    private static final String charset = "UTF-8";

    public static String aesEncryptString(String content, String key)
            throws InvalidKeyException, NoSuchAlgorithmException,
            NoSuchPaddingException, InvalidAlgorithmParameterException,
            IllegalBlockSizeException, BadPaddingException,
            UnsupportedEncodingException {
        byte[] contentBytes = content.getBytes(charset);
        byte[] keyBytes = key.getBytes(charset);
        byte[] encryptedBytes = aesEncryptBytes(contentBytes, keyBytes);
        //Encoder encoder = Base64.getEncoder();
        return new BASE64Encoder().encode((encryptedBytes));
    }

    public static String aesDecryptString(String content, String key)
            throws Exception {
        //Decoder decoder = Base64.getDecoder();
        byte[] encryptedBytes = new BASE64Decoder().decodeBuffer(content);
        byte[] keyBytes = key.getBytes(charset);
        byte[] decryptedBytes = aesDecryptBytes(encryptedBytes, keyBytes);
        return new String(decryptedBytes, charset);
    }

    public static byte[] aesEncryptBytes(byte[] contentBytes, byte[] keyBytes)
            throws NoSuchAlgorithmException, NoSuchPaddingException,
            InvalidKeyException, InvalidAlgorithmParameterException,
            IllegalBlockSizeException, BadPaddingException,
            UnsupportedEncodingException {
        return cipherOperation(contentBytes, keyBytes, Cipher.ENCRYPT_MODE);
    }

    public static byte[] aesDecryptBytes(byte[] contentBytes, byte[] keyBytes)
            throws NoSuchAlgorithmException, NoSuchPaddingException,
            InvalidKeyException, InvalidAlgorithmParameterException,
            IllegalBlockSizeException, BadPaddingException,
            UnsupportedEncodingException {
        return cipherOperation(contentBytes, keyBytes, Cipher.DECRYPT_MODE);
    }

    private static byte[] cipherOperation(byte[] contentBytes, byte[] keyBytes,
            int mode) throws UnsupportedEncodingException,
            NoSuchAlgorithmException, NoSuchPaddingException,
            InvalidKeyException, InvalidAlgorithmParameterException,
            IllegalBlockSizeException, BadPaddingException {
        SecretKeySpec secretKey = new SecretKeySpec(keyBytes, "AES");

        byte[] initParam = IV_STRING.getBytes(charset);
        IvParameterSpec ivParameterSpec = new IvParameterSpec(initParam);

        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        cipher.init(mode, secretKey, ivParameterSpec);

        return cipher.doFinal(contentBytes);
    }
    /**  
     * 十六進制轉換字符串 
     * @param String str Byte字符串(Byte之間無分隔符 如:[616C6B]) 
     * @return String 對應的字符串 
     */    
    public static String hexStr2Str(String hexStr)  
    {    
        String str = "0123456789ABCDEF";    
        char[] hexs = hexStr.toCharArray();    
        byte[] bytes = new byte[hexStr.length() / 2];    
        int n;    
  
        for (int i = 0; i < bytes.length; i++)  
        {    
            n = str.indexOf(hexs[2 * i]) * 16;    
            n += str.indexOf(hexs[2 * i + 1]);    
            bytes[i] = (byte) (n & 0xff);    
        }    
        return new String(bytes);    
    }public static String aesDecryptHexStr(String aecStr,String key) throws Exception{
        return SymmetricEncoder.aesDecryptString(SymmetricEncoder.hexStr2Str(aecStr),key);
    }
    
    public static void main(String args[]){
        try {
            
            String ss="364453613168592F4E68532F4F75306C7A72585459754F62686E43777475377733363339476278514468773D";
            System.out.println(SymmetricEncoder.aesDecryptHexStr(ss, "ABCDEFGHIJKLMNOP"));
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

安卓、IOS端AEC密鑰加密 Java端密鑰解密通用實現（16進制表現形式）