2

首先,我要感谢大家对我阅读本网站的帮助。非常感谢你。

我面临的问题是我必须使用objective-c(Iphone)加密字符串并在Web服务器中使用ColdFusion对其进行解密。我想使用的算法是 AES-128。

目前,我设法在两个站点中分别加密/解密。我在objective-c 中加密的所有内容都可以在objective-c 中解密,但不能在ColdFusion 中解密。基本上,加密的结果是不一样的。

我有尽可能简单和干净的代码,可以在这里发布。

我的objective-c输出是这个:

加密数据:BHmXSHXWOH6McXsttNTgpL5EQmfPCebjVShkZOeHBC8=

我的 ColdFusion 输出是这个:

加密数据:G+tdEOfQTtVCQGxW3N5uzlu0mGabRKNxuIdAXArQE8​​0=

如您所见,它们是不同的:(我认为问题可能出在Objective-C代码中,因为ColdFusion代码非常简单。但是老实说,我现在有点迷茫。非常感谢任何帮助。


这是我正在使用的代码的副本:

Objective-C 代码:

// Starting point of the application.
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    NSString *strData = @"This is a plain string.";
    NSString *strKey = @"12345678123456781234567812345678";
    NSString *strIv = @"1234567812345678";

    NSData *data = [NSData dataWithData:[strData dataUsingEncoding:NSUTF8StringEncoding]];
    NSData *iv = [NSData dataWithData:[strIv dataUsingEncoding:NSUTF8StringEncoding]];
    NSData *key = [NSData dataWithData:[strKey dataUsingEncoding:NSUTF8StringEncoding]];

    NSData *encryptedData = [self doCipher:data iv:iv key:key context:kCCEncrypt];
    NSLog(@"Encrypted data: %@",[self base64forData:encryptedData]);
}

// Method to encrypt/decrypt data
- (NSData *)doCipher:(NSData *)dataIn
                  iv:(NSData *)iv
                 key:(NSData *)symmetricKey
             context:(CCOperation)encryptOrDecrypt
{
    CCCryptorStatus ccStatus   = kCCSuccess;
    size_t          cryptBytes = 0;    // Number of bytes moved to buffer.
    NSMutableData  *dataOut    = [NSMutableData dataWithLength:dataIn.length + kCCBlockSizeAES128];

    ccStatus = CCCrypt( encryptOrDecrypt,
                       kCCAlgorithmAES128,
                       kCCOptionPKCS7Padding,
                       symmetricKey.bytes, 
                       kCCKeySizeAES128,
                       iv.bytes,
                       dataIn.bytes,
                       dataIn.length,
                       dataOut.mutableBytes,
                       dataOut.length,
                       &cryptBytes);

    if (ccStatus != kCCSuccess) {
        NSLog(@"CCCrypt status: %d", ccStatus);
    }

    dataOut.length = cryptBytes;

    return dataOut;
}

// Method to base64 encode data
- (NSString*)base64forData:(NSData*)theData {

    const uint8_t* input = (const uint8_t*)[theData bytes];
    NSInteger length = [theData length];

    static char table[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

    NSMutableData* data = [NSMutableData dataWithLength:((length + 2) / 3) * 4];
    uint8_t* output = (uint8_t*)data.mutableBytes;

    NSInteger i;
    for (i=0; i < length; i += 3) {
        NSInteger value = 0;
        NSInteger j;
        for (j = i; j < (i + 3); j++) {
            value <<= 8;

            if (j < length) {
                value |= (0xFF & input[j]);
            }
        }

        NSInteger theIndex = (i / 3) * 4;
        output[theIndex + 0] =                    table[(value >> 18) & 0x3F];
        output[theIndex + 1] =                    table[(value >> 12) & 0x3F];
        output[theIndex + 2] = (i + 1) < length ? table[(value >> 6)  & 0x3F] : '=';
        output[theIndex + 3] = (i + 2) < length ? table[(value >> 0)  & 0x3F] : '=';
    }

    return [[[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding] autorelease];
}

冷融合代码。我从这里得到它:

<cfcontent type="text/html; charset=utf-8">
<cfset thePlainData = "This is a plain string." />
<cfset theKey = toBase64("12345678123456781234567812345678") />
<cfset theAlgorithm = "AES/CBC/PKCS5Padding" />
<cfset theEncoding = "base64" />
<cfset theIV = "1234567812345678" />

<cfset encryptedString = encrypt(thePlainData, theKey, theAlgorithm, theEncoding, theIV) />

<cfoutput>Encrypted data: #encryptedString#</cfoutput>
4

1 回答 1

6

如果那是您使用的实际密钥,则看起来它的大小错误。它适用于 AES 256,而不是 128。此密钥在 CF 中产生相同的结果:

   <cfset theKey = toBase64("1234567812345678")>

结果:

    BHmXSHXWOH6McXsttNTgpL5EQmfPCebjVShkZOeHBC8= 
于 2012-07-22T03:07:00.470 回答