Android、IOS、PHP之间对称AES加密解密!

###php:

$aes = new aes;
echo $aes->aes128cbcEncrypt("11122222");
echo "\n";
echo $aes->aes128cbcEncrypt("中文aes演示");
echo "\n";
class aes{
    const KEY="625202f9149e061d";
    const IV ="5efd3f6060e20330";
    /**
     * pkcs7补码
     * @param string $string  明文
     * @param int $blocksize Blocksize , 以 byte 为单位
     * @return String
     */ 
    private function addPkcs7Padding($string, $blocksize = 32) {
        $len = strlen($string); //取得字符串长度
        $pad = $blocksize - ($len % $blocksize); //取得补码的长度
        $string .= str_repeat(chr($pad), $pad); //用ASCII码为补码长度的字符， 补足最后一段
        return $string;
    }

    /**
     * 加密然后base64转码
     * 
     * @param String 明文
     * @param 加密的初始向量（IV的长度必须和Blocksize一样， 且加密和解密一定要用相同的IV）
     * @param $key 密钥
     */
    function aes256cbcEncrypt($str, $iv, $key ) {   
        return base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $this->addPkcs7Padding($str) , MCRYPT_MODE_CBC, $iv));
    }

    /**
     * 除去pkcs7 padding
     * 
     * @param String 解密后的结果
     * 
     * @return String
     */
    private function stripPkcs7Padding($string){
        $slast = ord(substr($string, -1));
        $slastc = chr($slast);
        $pcheck = substr($string, -$slast);

        if(preg_match("/$slastc{".$slast."}/", $string)){
            $string = substr($string, 0, strlen($string)-$slast);
            return $string;
        } else {
            return false;
        }
    }
    /**
     * 解密
     * 
     * @param String $encryptedText 二进制的密文 
     * @param String $iv 加密时候的IV
     * @param String $key 密钥
     * @return String
     */
    function aes256cbcDecrypt($encryptedText, $iv, $key) {
        $encryptedText =base64_decode($encryptedText);
        return $this->stripPkcs7Padding(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, $encryptedText, MCRYPT_MODE_CBC, $iv));
    }

    function aes128cbcDecrypt($encryptedText, $iv=self::IV, $key=self::KEY) {
        $encryptedText =base64_decode($encryptedText);
        return $this->stripPkcs7Padding(mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $encryptedText, MCRYPT_MODE_CBC, $iv));
    }

    function hexToStr($hex)//十六进制转字符串
    {   
        $string=""; 
        for($i=0;$i<strlen($hex)-1;$i+=2)
        $string.=chr(hexdec($hex[$i].$hex[$i+1]));
        return  $string;
    }
    function strToHex($string)//字符串转十六进制
    { 
        $hex="";
        $tmp="";
        for($i=0;$i<strlen($string);$i++)
        {
            $tmp = dechex(ord($string[$i]));
            $hex.= strlen($tmp) == 1 ? "0".$tmp : $tmp;
        }
        $hex=strtoupper($hex);
        return $hex;
    }
    function aes128cbcHexDecrypt($encryptedText, $iv=self::IV, $key=self::KEY) {
        $str = $this->hexToStr($encryptedText);
        return $this->stripPkcs7Padding(mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $str, MCRYPT_MODE_CBC, $iv));
    }

    function aes128cbcEncrypt($str, $iv=self::IV, $key=self::KEY ) {    // $this->addPkcs7Padding($str,16)
        $base = (mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key,$this->addPkcs7Padding($str,16) , MCRYPT_MODE_CBC, $iv));
        return $this->strToHex($base);
    }
}

###IOS:

 //对数据进行解密
    NSData* result = [data aes256_decrypt:key];
    if (result && result.length > 0) {
        return [[NSString alloc] initWithData:result encoding:NSUTF8StringEncoding];
    }
    return nil;
}
@end





@implementation NSData (AES256)

- (NSData *)aes256_encrypt:(NSString *)key   //加密
{
    char keyPtr[kCCKeySizeAES256+1];
    bzero(keyPtr, sizeof(keyPtr));
    [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
    NSUInteger dataLength = [self length];
    size_t bufferSize = dataLength + kCCBlockSizeAES128;
    void *buffer = malloc(bufferSize);
    size_t numBytesEncrypted = 0;
    CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmAES128,
                                          kCCOptionPKCS7Padding ,
                                          keyPtr, kCCBlockSizeAES128,
                                          [AES_IV UTF8String],
                                          [self bytes], dataLength,
                                          buffer, bufferSize,
                                          &numBytesEncrypted);
    if (cryptStatus == kCCSuccess) {
        return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];
    }
    free(buffer);
    return nil;
}

- (NSData *)aes256_decrypt:(NSString *)key   //解密
{
    char keyPtr[kCCKeySizeAES256+1];
    bzero(keyPtr, sizeof(keyPtr));
    [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
    NSUInteger dataLength = [self length];
    size_t bufferSize = dataLength + kCCBlockSizeAES128;
    void *buffer = malloc(bufferSize);
    size_t numBytesDecrypted = 0;
    CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt, kCCAlgorithmAES128,
                                          kCCOptionPKCS7Padding ,
                                          keyPtr, kCCBlockSizeAES128,
                                          [AES_IV UTF8String],
                                          [self bytes], dataLength,
                                          buffer, bufferSize,
                                          &numBytesDecrypted);
    if (cryptStatus == kCCSuccess) {
        return [NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted];

    }
    free(buffer);
    return nil;
}

@end

###android:

package com.example.aes;


import java.io.UnsupportedEncodingException;


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


/**
 * AES加密解密算法
 */
public class AesEncryptionUtil {
	/** 算法/模式/填充 **/
	private static final String CipherMode = "AES/CBC/PKCS5Padding";


	/** 创建密钥 **/
	private static SecretKeySpec createKey(String key) {
		byte[] data = null;
		if (key == null) {
			key = "";
		}
		StringBuffer sb = new StringBuffer(16);
		sb.append(key);
		while (sb.length() < 16) {
			sb.append("0");
		}
		if (sb.length() > 16) {
			sb.setLength(16);
		}


		try {
			data = sb.toString().getBytes("UTF-8");
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		return new SecretKeySpec(data, "AES");
	}


	private static IvParameterSpec createIV(String password) {
		byte[] data = null;
		if (password == null) {
			password = "";
		}
	StringBuffer sb = new StringBuffer(16);
		sb.append(password);
		while (sb.length() < 16) {
			sb.append("0");
		}
		if (sb.length() > 16) {
			sb.setLength(16);
		}


		try {
			data = sb.toString().getBytes("UTF-8");
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		return new IvParameterSpec(data);
	}


	/** 加密字节数据 **/
	public static byte[] encrypt(byte[] content, String password, String iv) {
		try {
			SecretKeySpec key = createKey(password);
			Cipher cipher = Cipher.getInstance(CipherMode);
			cipher.init(Cipher.ENCRYPT_MODE, key, createIV(iv));
			byte[] result = cipher.doFinal(content);
			return result;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}


	/** 加密(结果为16进制字符串) **/
	public static String encrypt(String content, String password, String iv) {
		byte[] data = null;
		try {
			data = content.getBytes("UTF-8");
		} catch (Exception e) {
			e.printStackTrace();
		}
		data = encrypt(data, password, iv);
		String result = byte2hex(data);
		return result;
	}


	/** 解密字节数组 **/
	public static byte[] decrypt(byte[] content, String password, String iv) {
		try {
			SecretKeySpec key = createKey(password);
			Cipher cipher = Cipher.getInstance(CipherMode);
			cipher.init(Cipher.DECRYPT_MODE, key, createIV(iv));
			byte[] result = cipher.doFinal(content);
			return result;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}


	/** 解密(输出结果为字符串) **/
	public static String decrypt(String content, String password, String iv) {
		byte[] data = null;
		try {
			data = hex2byte(content);
		} catch (Exception e) {
			e.printStackTrace();
		}
		data = decrypt(data, password, iv);
		if (data == null)
			return null;
		String result = null;
		try {
			result = new String(data, "UTF-8");
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		return result;
	}


	/** 字节数组转成16进制字符串 **/
	public static String byte2hex(byte[] b) { // 一个字节的数，
		StringBuffer sb = new StringBuffer(b.length * 2);
		String tmp = "";
		for (int n = 0; n < b.length; n++) {
			// 整数转成十六进制表示
			tmp = (java.lang.Integer.toHexString(b[n] & 0XFF));
			if (tmp.length() == 1) {
				sb.append("0");
			}
			sb.append(tmp);
		}
		return sb.toString().toUpperCase(); // 转成大写
	}


	/** 将hex字符串转换成字节数组 **/
	private static byte[] hex2byte(String inputString) {
		if (inputString == null || inputString.length() < 2) {
			return new byte[0];
		}
		inputString = inputString.toLowerCase();
		int l = inputString.length() / 2;
		byte[] result = new byte[l];
		for (int i = 0; i < l; ++i) {
			String tmp = inputString.substring(2 * i, 2 * i + 2);
			result[i] = (byte) (Integer.parseInt(tmp, 16) & 0xFF);
		}

---

本文链接： https://dragonersli.github.io/2016/07/02/Android、IOS、PHP之间对称AES加密解密!/
本人声明： 此文只作为自己日后工作学习中遇到类似问题方便快速回忆解决问题的笔记，仅供参考！
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