升级ios9后RSA加密结果是空 问题是SecItemAdd

转自:http://blog.youkuaiyun.com/ylgwhyh/article/details/49756209

问题描述(csdn上的网友)：

ret = SecItemAdd((__bridge CFDictionaryRef) publicKeyDict, (CFTypeRef*)&pubKeyRef);
在iOS8系统下下面的上面这句代码没问题，ret = 0，pubKeyRef的值是：
po pubKeyRef
<SecKeyRef algorithm id: 1, key type: RSAPublicKey, version: 3, block size: 1024 bits, exponent: {hex: 10001, decimal: 65537}, modulus: B5CE747C46781C81488F169C72828B72233E6E3B70525D2CE088665EC1B61F3F5FC7FE96CFB8BFFA699D61D0316ACC8C021A03ABF703C75510990F95008E4A3303ACF424B3E7EFEA001D0499CE00EB293A79B2054D11852E66D81EABF9B714A0013611059810C4CD670B50AC5D2E6B743049A5297AD38690C25BB3BBF95A331D, addr: 0x15e0baa00>

在ios9下，这句返回值ret = 0，但是pubKeyRef得到的值为空。------摘录至：http://bbs.youkuaiyun.com/topics/391833626

问题描述:(苹果官方论坛上面网友的描述)：

Christianto Aug 20, 2015 9:04 PM

Hi Guys,

Recenlty I have been testing my code in iOS 9 with Xcode 7 Beta 5. In my app, I am using + (SecKeyRef) addPeerPublicKey:(NSString *) peerName withPublicKey:(NSData *) publicKey method to generate public key from exponent and modulus. It turns out that SecKeyRef generate is always nil in iOS 9 but works well in iOS 8. Is it bug for the Xcode 7 Beta 5 or There are several changing that i need to do in order to make it works in iOS 9?

Please help.

Thanks.

Best Regards, 

Chris               摘录至：https://forums.developer.apple.com/thread/15129

解决办法：

原文链接：http://stackoverflow.com/questions/32096304/ios-9-secitemcopymatching-returns-successful-status-code-but-key-is-nil

up vote 1 down vote

The bug occurs due to malformed public key referhttps://forums.developer.apple.com/thread/15129 If you use Basic Encoding Rules library here's the solution. To fix your public key you need to insert nil byte before modulus data.https://github.com/StCredZero/SCZ-BasicEncodingRules-iOS/issues/6#issuecomment-136601437 P.S. For me fix was as simple as: const char fixByte = 0; NSMutableData * fixedModule = [NSMutableData dataWithBytes:&fixByte length:1]; [fixedModule appendData:modulusData]; share improve this answer

其他有用的参考资料：https://github.com/StCredZero/SCZ-BasicEncodingRules-iOS/issues/6#issuecomment-136601437

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