Question

I am searching for some cocoa code on AES encryption and I did some google search for it. I found this very useful link - http://iphonedevelopment.blogspot.com/2009/02/strong-encryption-for-cocoa-cocoa-touch.html. So I tried it but it did not work for me.

任何人都可以向我提出某种有用的链接或源码,帮助我在抽样申请中执行。

Answer 1

AES128 加密可在通用Crypto框架中的Pi。相关职能由共同承担。

您可以建立这样的密码:

// Assume key and keylength exist
CCCryptorRef cryptor;
if(kCCSuccess != CCCryptorCreate(kCCEncrypt, kCCAlgorithmAES128, 0, key, keyLength, NULL, &cryptor))
  ; //handle error

// Repeatedly call CCCryptorUpdate to encrypt the data

CCCryptorRelease(cryptor);

从问题看,看上去看,你正在寻找执行《经济、社会、文化权利国际公约》的情况。我不建议使用 Apple果。

参看。或许也可以帮助你,但我已经做了检测。

Answer 2

我在<代码>NSData上使用了一个简单的类别,该类别使用载于<代码>CommonCrypto的框架进行AES 256-bit加密。我在Mac使用这个词,但是它也应该在Peit开展工作:

#import <CommonCrypto/CommonCryptor.h>
@implementation NSData (AESAdditions)
- (NSData*)AES256EncryptWithKey:(NSString*)key {
    //  key  should be 32 bytes for AES256, will be null-padded otherwise
    char keyPtr[kCCKeySizeAES256 + 1]; // room for terminator (unused)
    bzero(keyPtr, sizeof(keyPtr)); // fill with zeroes (for padding)

    // fetch key data
    [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];

    NSUInteger dataLength = [self length];

    //See the doc: For block ciphers, the output size will always be less than or
    //equal to the input size plus the size of one block.
    //That s why we need to add the size of one block here
    size_t bufferSize           = dataLength + kCCBlockSizeAES128;
    void* buffer                = malloc(bufferSize);

    size_t numBytesEncrypted    = 0;
    CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmAES128, kCCOptionPKCS7Padding,
                                          keyPtr, kCCKeySizeAES256,
                                          NULL /* initialization vector (optional) */,
                                          [self bytes], dataLength, /* input */
                                          buffer, bufferSize, /* output */
                                          &numBytesEncrypted);

    if (cryptStatus == kCCSuccess)
    {
        //the returned NSData takes ownership of the buffer and will free it on deallocation
        return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];
    }

    free(buffer); //free the buffer;
    return nil;
}

- (NSData*)AES256DecryptWithKey:(NSString*)key {
    //  key  should be 32 bytes for AES256, will be null-padded otherwise
    char keyPtr[kCCKeySizeAES256 + 1]; // room for terminator (unused)
    bzero(keyPtr, sizeof(keyPtr)); // fill with zeroes (for padding)

    // fetch key data
    [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];

    NSUInteger dataLength = [self length];

    //See the doc: For block ciphers, the output size will always be less than or
    //equal to the input size plus the size of one block.
    //That s why we need to add the size of one block here
    size_t bufferSize           = dataLength + kCCBlockSizeAES128;
    void* buffer                = malloc(bufferSize);

    size_t numBytesDecrypted    = 0;
    CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt, kCCAlgorithmAES128, kCCOptionPKCS7Padding,
                                          keyPtr, kCCKeySizeAES256,
                                          NULL /* initialization vector (optional) */,
                                          [self bytes], dataLength, /* input */
                                          buffer, bufferSize, /* output */
                                          &numBytesDecrypted);

    if (cryptStatus == kCCSuccess)
    {
        //the returned NSData takes ownership of the buffer and will free it on deallocation
        return [NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted];
    }

    free(buffer); //free the buffer;
    return nil;
}
@end

Answer 3

我发现的所有例子都对我不利,因此我改变了上述解决办法。这对我来说是一件事,对基地64的谷歌-Lib使用:

+ (NSData *)AES256DecryptWithKey:(NSString *)key data:(NSData*)data encryptOrDecrypt:(CCOperation)encryptOrDecrypt {

    //  key  should be 32 bytes for AES256, will be null-padded otherwise
    char keyPtr[kCCKeySizeAES256+1]; // room for terminator (unused)
    bzero(keyPtr, sizeof(keyPtr)); // fill with zeroes (for padding)

    // fetch key data
    [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];

    if (encryptOrDecrypt == kCCDecrypt)
    {
        data = [GTMBase64 decodeData:data];
    }

        NSUInteger dataLength = [data length];

    //See the doc: For block ciphers, the output size will always be less than or 
    //equal to the input size plus the size of one block.
    //That s why we need to add the size of one block here
    size_t bufferSize = dataLength + kCCBlockSizeAES128;

    void *buffer = malloc(bufferSize);

    size_t numBytesDecrypted = 0;
    CCCryptorStatus cryptStatus = CCCrypt(encryptOrDecrypt,
                                          kCCAlgorithmAES128,
                                          kCCOptionPKCS7Padding,
                                          keyPtr,
                                          kCCKeySizeAES256,
                                          NULL /* initialization vector (optional) */,
                                          [data bytes], dataLength, /* input */
                                          buffer,       bufferSize, /* output */
                                          &numBytesDecrypted);

    if (cryptStatus != kCCSuccess){ 
        NSLog(@"ERROR WITH FILE ENCRYPTION / DECRYPTION");
        return nil;
    }

    NSData *result;

    if (encryptOrDecrypt == kCCDecrypt)
    {
        result = [NSData dataWithBytes:(const void *)buffer length:(NSUInteger)numBytesDecrypted];
    }
    else
    {
        NSData *myData = [NSData dataWithBytes:(const void *)buffer length:(NSUInteger)numBytesDecrypted];
        result = [GTMBase64 encodeData:myData];
    }

    free(buffer); //free the buffer;
    return result;
}

Answer 4

感谢扩大类别。我发现的一件事——当你使用比较算法(CCCrypt)时,即64比值更强时,你需要遵守BIS出口条例。详情见“联通部队”。即便是使用 Apple果的隐形加密,你也需要从生物物理研究所获得批准。

此前曾讨论过这个专题(在使用斜体方面):

(a) 在ipe使用SSL;

Best Regards Chris

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