[Day]使用AES在php中加密，并用objective-c解密

本文链接：https://blog.youkuaiyun.com/pClass/article/details/6727552

本文展示了如何在PHP和iOS平台上使用AES算法进行加密和解密操作，并通过Base64编码。提供了PHP和iOS代码示例，包括密钥生成、加密、解密过程以及跨平台验证。

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在不同平台进行AES加密，并使用Base64进行编码，结果有可能不同，但解密之后会一样，所以不要因为在2个平台加密结果不一样而认为自己错了。。。

php加密解密：

<?php
$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB);
$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
$key = 'a16byteslongkey!a16byteslongkey!';
$plaintext = "iphone";

$ciphertext = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, $plaintext, MCRYPT_MODE_ECB);
$base64encoded_ciphertext = base64_encode($ciphertext);
echo "ciphertext: ".$base64encoded_ciphertext."<br/>";

$plaintext = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, base64_decode($base64encoded_ciphertext), MCRYPT_MODE_ECB);
echo "plaintext: ".$plaintext."<br/>";

$base64encoded_ciphertext =  "I3chV+E2XUHeLCcJAhBaJQ==";
$plaintext = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, base64_decode($base64encoded_ciphertext), MCRYPT_MODE_ECB);
echo "plaintext: ".trim($plaintext);
?>

iphone加密解密

#import "NSString+AESCrypt.h"
NSString *key = @"a16byteslongkey!a16byteslongkey!";
NSString *plaintext = @"iphone";
NSString *ciphertext = [plaintext AES256EncryptWithKey: key];
NSLog(@"ciphertext: %@", ciphertext);
plaintext = [ciphertext AES256DecryptWithKey: key];
NSLog(@"plaintext: %@", plaintext);

以下是一个在php中加密，然后在iphone中解密的例子
php 代码：

<?php
$key = "test_AES_key";

$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB);
$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
$key = md5($key);
$plaintext = "ksfe";

$ciphertext = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, $plaintext, MCRYPT_MODE_ECB);
$base64encoded_ciphertext = base64_encode($ciphertext);
echo $base64encoded_ciphertext."<br/>";

//$plaintext = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, base64_decode($base64encoded_ciphertext), MCRYPT_MODE_ECB);
//echo "plaintext: ".$plaintext."<br/>";
?>

iphone 代码：

-(NSString *)md5:(NSString *)str { 
    const char *cStr = [str UTF8String]; 
    unsigned char result[32]; 
    CC_MD5( cStr, strlen(cStr), result ); 
    return [NSString stringWithFormat: 
            @"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
            result[0], result[1], result[2], result[3], 
            result[4], result[5], result[6], result[7], 
            result[8], result[9], result[10], result[11], 
            result[12], result[13], result[14], result[15] 
            ]; 
}

#import "NSString+AESCrypt.h"

NSString *strKey = @"test_AES_key";
NSData *chipherData = [NSData dataWithContentsOfURL: [NSURL URLWithString: @"http://192.168.157.1/index_aes.php"]];
    
NSString *chipherText = [[NSString alloc] initWithData: chipherData encoding: NSUTF8StringEncoding];
NSString *plainText = [chipherText AES256DecryptWithKey: [self md5: strKey]];
NSLog(@"plainText: %@", plainText);