我正在尝试弄清楚如何从网页向我的IOS应用程序发送加密数据。
在php中,我有一个加密字符串的页面,然后将其作为base64编码的字符串回显:
<?php
function encode($json, $key, $iv){
echo base64_encode($iv . "::" . openssl_encrypt ($json, 'AES-256-CTR', $key, OPENSSL_RAW_DATA, $iv));
}
$key = substr(sha1("super awesome key goes here", true), 0, 16);
$iv = openssl_random_pseudo_bytes(16);
$table = array("key1"=>"value1", "key2"=>"value2");
$json = json_encode($table);
encode($json, $key, $iv);
?>
我能够接受该回显的字符串并在PHP中解码它。
在IOS中,我有一个打开该页面并抓取编码字符串的函数:
-(IBAction)fetchData:(id)sender{
// Fetch data
NSURL *url = [NSURL URLWithString: @"https://www.website.com/dataupdate.php"];
NSURLSessionConfiguration *defaultConfigObject = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession *defaultSession = [NSURLSession sessionWithConfiguration: defaultConfigObject delegate:nil delegateQueue:[NSOperationQueue mainQueue]];
NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:url];
NSString *params = @"";
[urlRequest setHTTPMethod:@"POST"];
[urlRequest setHTTPBody:[params dataUsingEncoding:NSUTF8StringEncoding]];
NSURLSessionDataTask *dataTask = [defaultSession dataTaskWithRequest: urlRequest completionHandler:^(NSData *data, NSURLResponse *response, NSError *error){
NSLog(@"response: %@ %@\n",response, error);
if(error == nil){
NSString *text = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSLog(@"Data = %@", text);
NSData *decodedData = [[NSData alloc] initWithBase64EncodedString: text options:0];
// Fails here
NSString *decodedString = [[NSString alloc] initWithData:decodedData encoding:NSUTF8StringEncoding];
NSLog(@"64 Decoded: %@",decodedString);
}
}];
[dataTask resume];
}
我假设它因encoding:NSUTF8StringEncoding
部分而失败,但我不知道该怎么做。我确实试过encoding:NSUTF32StringEncoding
,但情况并不好。
PHP加密行有OPENSSL_RAW_DATA作为选项,但我还没有找到任何可以告诉编码RAW数据的地方......
编辑:
这是我在赶回家时试图挤出问题所得到的......
openssl_encrypt ($json, 'AES-256-CTR', $key, OPENSSL_RAW_DATA, $iv)
返回:
. m #6 : ĕO;֧ª 0`“) -
在我用base64对它进行编码之后我得到了这个:
INI70ZBDUjYouoGlSIFGbzo6v6Eu320Hyg2pIzaOCIw6zMSVTzvWpyDCqr0wYCIpmy2P
在IOS方面,我可以使用NSString *text = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
将base62字符串发送到文本变量
但是,当我使用[[NSString alloc] initWithData:decodedData encoding:NSUTF8StringEncoding];
将base64字符串转换为openssl_encrypt
字符串时,它只返回nil
我得到它后返回一个值然后我可以处理实际的解密。我只想弄清楚一步一步。
编辑:再试一次......
所以,玩弄它,我想我错过了一些重要的东西......
if(error == nil){
NSString *key = @"05nszDCobKjjavWBfG/ZcC/A4DQ=";
NSString *text = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSArray *items = [text componentsSeparatedByString:@"::"];
NSString *iv = [items objectAtIndex:0];
NSString *msg = [items objectAtIndex:1];
NSLog(@"\n\n\n IV = %@ \n\n\n Data = %@", iv, msg);
NSData *decodedKey = [[NSData alloc] initWithBase64EncodedString:key options:0];
NSData *decodedIV = [[NSData alloc] initWithBase64EncodedString: iv options:0];
NSData *decodedMsg = [[NSData alloc] initWithBase64EncodedString: msg options:0];
NSLog(@"\n\n\n DecodedKey = %@ \n\n\n DecodedIV = %@ \n\n\n DecodedData = %@", decodedKey, decodedIV, decodedMsg);
NSString *hexKey = NSDataToHex(decodedKey);
NSString *hexIV = NSDataToHex(decodedIV);
NSString *hexMsg = NSDataToHex(decodedMsg);
NSLog(@"\n\n\n HexKey = %@ \n\n\n HexIV = %@ \n\n\n HexData = %@", hexKey, hexIV, hexMsg);
CkoCrypt2 *decrypt = [[CkoCrypt2 alloc] init];
decrypt.CryptAlgorithm = @"aes";
decrypt.CipherMode = @"ctr";
decrypt.KeyLength = [NSNumber numberWithInt: 256];
decrypt.EncodingMode = @"hex";
[decrypt SetEncodedIV:hexIV encoding:@"hex"];
[decrypt SetEncodedKey:hexKey encoding:@"hex"];
NSString *decryptedStringHex = [decrypt DecryptEncoded:hexMsg];
NSData *decryptedData = [decrypt DecryptBytes:decodedMsg];
NSString *decryptedStringData = [[NSString alloc] initWithData:decryptedData encoding:NSUTF8StringEncoding];
NSLog(@"decoded and decrypted Hex: %@ /n/nData: %@",decryptedStringHex, decryptedStringData);
}
然后我的数据变为十六进制:
static inline char itoh(int i){
if (i > 9) return 'A' + (i - 10);
return '0' + i;
}
NSString * NSDataToHex(NSData *data) {
NSUInteger i, len;
unsigned char *buf, *bytes;
len = data.length;
bytes = (unsigned char*)data.bytes;
buf = malloc(len*2);
for (i=0; i<len; i++){
buf[i*2] = itoh((bytes[i] >> 4) & 0xF);
buf[i*2+1] = itoh(bytes[i] & 0xF);
}
return [[NSString alloc] initWithBytesNoCopy:buf length:len*2 encoding:NSASCIIStringEncoding freeWhenDone:YES];
}
NSString *decryptedString = [decrypt DecryptEncoded:hexMsg];
返回nil。
`NSData * decryptedData = [decrypt DecryptBytes:encodedMsg]; NSString * decryptedString = [[NSString alloc] initWithData:decryptedData encoding:NSUTF8StringEncoding];'也返回nil。
这是我的日志:
2017-03-24 13:20:26.222 GWM [47000:3317901]
IV = xiiRvStJen2M2VrUuavHZg ==
数据= c4Okkz + MCpdSX935O6nNudoJ0ud + oS4sz9GbPFMDsCL5 + yJaQ0mzJckP7S6Q / OE =
2017-03-24 13:49:40.548 GWM [47283:3332493]
DecodedKey =
DecodedIV =
DecodedData =&lt; 7383a493 3f8c0a97 525fddf9 3ba9cdb9 da09d2e7 7ea12e2c cfd19b3c 5303b022 f9fb225a 4349b325 c90fed2e 90fe81
2017-03-24 13:49:40.548 GWM [47283:3332493]
HexKey = D399ECCC30A86CA8E36AF5817C6FD9702FC0E034
HexIV = C62891BD2B497A7D8CD95AD4B9ABC766
HexData = 7383A4933F8C0A97525FDDF93BA9CDB9DA09D2E77EA12E2CCFD19B3C5303B022F9FB225A4349B325C90FED2E90FE81
2017-03-24 13:49:49.779 GWM [47283:3332493]解码并解密
十六进制:( null)
数据:
答案 0 :(得分:4)
正如人们所提到的,你只是错过了实际的解密步骤。通常最容易使用现有的第三方资源来帮助 - 像this这样的东西应该有效。所以基本上:
修改:
以下内容改编自链接资源,可用于解密Base64解码数据:
if(error == nil){
NSString *text = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSLog(@"Data = %@", text);
NSData *decodedData = [[NSData alloc] initWithBase64EncodedString: text options:0];
CkoCrypt2 *decrypt = [[CkoCrypt2 alloc] init];
decrypt.CryptAlgorithm = @"aes";
decrypt.CipherMode = @"ctr";
decrypt.KeyLength = [NSNumber numberWithInt:256];
decrypt.EncodingMode = @"hex";
[decrypt SetEncodedIV:IV encoding:@"hex"];
[decrypt SetEncodedKey:KEY encoding:@"hex"];
NSData *decryptedData = [decrypt decryptEncoded:decodedData];
NSString *decryptedString = [[NSString alloc] initWithData:decryptedData encoding:NSUTF8StringEncoding];
NSLog(@"64 Decoded and decrypted: %@",decodedString);
}
请注意,某些设置可能需要稍微调整,但逻辑应该有效。
答案 1 :(得分:0)
您的PHP代码以JSON开头。
它在JSON上运行SSL,然后base64对结果进行编码。你有
JSON&GT; SSL&GT; BASE64
在接收方,你需要:
您在iOS代码中缺少第2步,因此失败。
答案 2 :(得分:0)
我最终使用RNCryptor让它工作,因为它有适用于IOS和PHP的版本,甚至还有Android版本。这样我就不必尝试在每个平台上使用不同的方法。
<强> PHP:强>
$table = array("first"=>"First Value", "second"=>"Second value");
$json = json_encode($table);
$password = "my super awesome password";
$cryptor = new \RNCryptor\RNCryptor\Encryptor;
$base64Encrypted = $cryptor->encrypt($json, $password);
echo $base64Encrypted;
<强>的XCode:强>
NSURL *url = [NSURL URLWithString:@"https://www.website.com/dataupdate.php"];
NSData *encryptedData = [[NSData alloc] initWithBase64EncodedString: [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:nil] options:0];
NSString *password = @"my super awesome password";
NSError *error = nil;
NSData *decryptedData = [RNDecryptor decryptData: encryptedData withPassword:password error:&error];
self.jsonList = [NSJSONSerialization JSONObjectWithData:decryptedData options:NSJSONReadingMutableContainers error:&error];