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POAdding private key into iOS Keychain
 

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  1. POAdding private key into iOS Keychain
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    <p>I am trying to add a private key into the iOS keychain. The certificate (public key) works fine but the private key refuses... I am totally confused why the following code does not work.</p> <p>First I am checking if the current key (=key in case of that the Keychain is a key/value store) is 'free' in the Keychain. Then I am going to add the private key.</p> <pre><code>CFStringRef labelstring = CFStringCreateWithCString(NULL, [key cStringUsingEncoding:NSUTF8StringEncoding], kCFStringEncodingUTF8); NSArray* keys = [NSArray arrayWithObjects:(__bridge id)kSecClass,kSecAttrLabel,kSecReturnData,kSecAttrAccessible,nil]; NSArray* values = [NSArray arrayWithObjects:(__bridge id)kSecClassKey,labelstring,kCFBooleanTrue,kSecAttrAccessibleWhenUnlocked,nil]; NSMutableDictionary* searchdict = [NSMutableDictionary dictionaryWithObjects:values forKeys:keys]; CFRelease(labelstring); NSMutableDictionary *query = searchdict; CFTypeRef item = NULL; OSStatus error = SecItemCopyMatching((__bridge_retained CFDictionaryRef) query, &amp;item); if (error) { NSLog(@"Error: %ld (statuscode)", error); } if(error != errSecItemNotFound) { SecItemDelete((__bridge_retained CFDictionaryRef) query); } [query setObject:(id)data forKey:(__bridge id)kSecValueData]; OSStatus status = SecItemAdd((__bridge_retained CFDictionaryRef) query, &amp;item); if(status) { NSLog(@"Keychain error occured: %ld (statuscode)", status); return NO; } </code></pre> <p>The debug output is the following:</p> <pre><code>2012-07-26 15:33:03.772 App[15529:1b03] Error: -25300 (statuscode) 2012-07-26 15:33:11.195 App[15529:1b03] Keychain error occured: -25299 (statuscode) </code></pre> <p>The first error code <code>-25300</code> represents <code>errSecItemNotFound</code>. So there is no value stored for this key. Then, when I try to add the private key into the Keychain I get <code>-25299</code> which means <code>errSecDuplicateItem</code>. I do not understand this. Why is this happening?</p> <p>Does anyone have a clue or hint on this?</p> <p>Apple's error codes:</p> <pre><code>errSecSuccess = 0, /* No error. */ errSecUnimplemented = -4, /* Function or operation not implemented. */ errSecParam = -50, /* One or more parameters passed to a function where not valid. */ errSecAllocate = -108, /* Failed to allocate memory. */ errSecNotAvailable = -25291, /* No keychain is available. You may need to restart your computer. */ errSecDuplicateItem = -25299, /* The specified item already exists in the keychain. */ errSecItemNotFound = -25300, /* The specified item could not be found in the keychain. */ errSecInteractionNotAllowed = -25308, /* User interaction is not allowed. */ errSecDecode = -26275, /* Unable to decode the provided data. */ errSecAuthFailed = -25293, /* The user name or passphrase you entered is not correct. */ </code></pre> <p>Thanks in advance!</p> <p><strong>Update #1: I've figured out that it works only for the first time. Even when data and key is different, after the first time stored into the keychain I cannot store further keys.</strong></p>
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    1. COI'm facing the exact same issue. First key added using SecItemAdd without a problem, then any consecutive call to SecItemAdd fails with errSecDuplicateItem although despite SecItemCopyMatching returning errSecItemNotFound. Have you found a solution to this yet?
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