NSData(AES) 机密解密

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@implementation NSData(AES)

- (NSData *) EncryptAES {

char keyPtr[kCCKeySizeAES256+1];

bzero( keyPtr, sizeof(keyPtr) );

[_keygetCString: keyPtr maxLength: sizeof(keyPtr) encoding:NSUTF16StringEncoding];

size_t numBytesEncrypted = 0;

NSUInteger dataLength = [selflength];

size_t bufferSize = dataLength + kCCBlockSizeAES128;

void *buffer = malloc(bufferSize);

CCCryptorStatus result =CCCrypt( kCCEncrypt, kCCAlgorithmAES128,kCCOptionPKCS7Padding,

keyPtr, kCCKeySizeAES256,

NULL,

[self bytes], [self length],

buffer, bufferSize,

&numBytesEncrypted );

if( result == kCCSuccess )

return [NSDatadataWithBytesNoCopy:buffer length:numBytesEncrypted];

free(buffer);

return nil;

}

- (NSData *) DecryptAES {

char keyPtr[kCCKeySizeAES256+1];

bzero( keyPtr, sizeof(keyPtr) );

[_keygetCString: keyPtr maxLength: sizeof(keyPtr) encoding:NSUTF16StringEncoding];

size_t numBytesEncrypted = 0;

NSUInteger dataLength = [selflength];

size_t bufferSize = dataLength + kCCBlockSizeAES128;

void *buffer_decrypt = malloc(bufferSize);

CCCryptorStatus result =CCCrypt( kCCDecrypt , kCCAlgorithmAES128,kCCOptionPKCS7Padding,

keyPtr, kCCKeySizeAES256,

NULL,

[self bytes], [self length],

buffer_decrypt, bufferSize,

&numBytesEncrypted );

if( result == kCCSuccess )

return [NSDatadataWithBytesNoCopy:buffer_decrypt length:numBytesEncrypted];

free(buffer_decrypt);

return nil;

}

@end

NSData(AES) 机密 解密