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    <p>As all of the answers so far relies on that you know the identifiers you want to delete I would like to submit the following solution that <strong>deletes ALL existing keys</strong> for the app (iOS only)</p> <pre><code>-(void)resetKeychain { [self deleteAllKeysForSecClass:kSecClassGenericPassword]; [self deleteAllKeysForSecClass:kSecClassInternetPassword]; [self deleteAllKeysForSecClass:kSecClassCertificate]; [self deleteAllKeysForSecClass:kSecClassKey]; [self deleteAllKeysForSecClass:kSecClassIdentity]; } -(void)deleteAllKeysForSecClass:(CFTypeRef)secClass { NSMutableDictionary* dict = [NSMutableDictionary dictionary]; [dict setObject:(__bridge id)secClass forKey:(__bridge id)kSecClass]; OSStatus result = SecItemDelete((__bridge CFDictionaryRef) dict); NSAssert(result == noErr || result == errSecItemNotFound, @"Error deleting keychain data (%ld)", result); } </code></pre> <p><strong>Swift 2.2</strong> version:</p> <pre><code>func resetKeychain() { self.deleteAllKeysForSecClass(kSecClassGenericPassword) self.deleteAllKeysForSecClass(kSecClassInternetPassword) self.deleteAllKeysForSecClass(kSecClassCertificate) self.deleteAllKeysForSecClass(kSecClassKey) self.deleteAllKeysForSecClass(kSecClassIdentity) } func deleteAllKeysForSecClass(secClass: CFTypeRef) { let dict: [NSString : AnyObject] = [kSecClass : secClass] let result = SecItemDelete(dict) assert(result == noErr || result == errSecItemNotFound, "Error deleting keychain data (\(result))") } </code></pre> <p><strong>Swift 3</strong> version</p> <pre><code>func resetKeychain() { deleteAllKeysForSecClass(kSecClassGenericPassword) deleteAllKeysForSecClass(kSecClassInternetPassword) deleteAllKeysForSecClass(kSecClassCertificate) deleteAllKeysForSecClass(kSecClassKey) deleteAllKeysForSecClass(kSecClassIdentity) } func deleteAllKeysForSecClass(_ secClass: CFTypeRef) { let dict: [NSString : Any] = [kSecClass : secClass] let result = SecItemDelete(dict as CFDictionary) assert(result == noErr || result == errSecItemNotFound, "Error deleting keychain data (\(result))") } </code></pre>
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