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此方法用于获取 iOS 中的公钥位。

- (NSData *)getPublicKeyBits {
    OSStatus sanityCheck = noErr;
    NSData * publicKeyBits = nil;

    NSMutableDictionary * queryPublicKey = [[NSMutableDictionary alloc] init];

    // Set the public key query dictionary.
    [queryPublicKey setObject:(id)kSecClassKey forKey:(id)kSecClass];
    [queryPublicKey setObject:publicTag forKey:(id)kSecAttrApplicationTag];
    [queryPublicKey setObject:(id)kSecAttrKeyTypeRSA forKey:(id)kSecAttrKeyType];
    [queryPublicKey setObject:[NSNumber numberWithBool:YES] forKey:(id)kSecReturnData];

    // Get the key bits.
    sanityCheck = SecItemCopyMatching((CFDictionaryRef)queryPublicKey, (CFTypeRef *)&publicKeyBits);

    if (sanityCheck != noErr)
    {
        publicKeyBits = nil;
    }

    [queryPublicKey release];

    return publicKeyBits;
}

但它仅适用于 iOS，不适用于 OSX，对于 OSX，我需要使用安全转换。https://developer.apple.com/library/mac/#documentation/Security/Conceptual/SecTransformPG/Introduction/Introduction.html#//apple_ref/doc/uid/TP40010801-CH1-SW1

我知道如何生成一对公钥/私钥，并为 iOS 做。

我需要在 OSX 中使用什么样的转换来从公钥中获取公钥位？为了获得与提供的 iOS 示例相同的效果。

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