Generate Publick Key From Mac Keychain

19.05.202019.05.2020

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After you or your Mac administrator resets the password of your macOS user account, your Mac might ask you to update your keychain password or enter the password of your login keychain. It might also tell you that the system was unable to unlock your login keychain. That's because your login keychain is still using your old password.

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Aug 07, 2019 iCloud Keychain can help you sign into online accounts even more quickly by autofilling usernames, passwords, and credit card numbers for you. It can even generate strong passwords for you. Here's how to use it on Mac. How to manage passwords with Keychain Access. Keychains are key. Ever since Mac OS 8.6, the Mac has managed passwords with Keychain, Apple’s password-management system. The Keychain Access. May 28, 2006 SSH public key authentication on Mac OS X. One of OpenSSH’s great features is ssh public key authentication. For those of you who are as lazy as I am, and don’t want to type in and remember all kinds of different passwords for different hosts, it is the solution. Jun 30, 2014 A Keychain Access for Mac OS X tutorial and introduction. This video gives users an overview of what Keychain Access on Mac is and how to get started with using Keychain Access. Mac for Beginners.

If you don't know your old password

If you don't know your old password, the solution is to create a new login keychain.

Aug 28, 2017 After you or your Mac administrator resets the password of your macOS user account, your Mac might ask you to update your keychain password or enter the password of your login keychain. It might also tell you that the system was unable to unlock your login keychain. That's because your login keychain is still using your old password. There's no need of backing up the Public Key as it is in the actual Certificate, which can be easily downloaded from the iOS Dev Center. When you manually generate a Certificate, you firstly need to generate a Certificate Signing Request through the Keychain Access application. When this is done, both Public and Private keys are generated. The private one is automatically saved into your Mac. After you've checked for existing SSH keys, you can generate a new SSH key to use for authentication, then add it to the ssh-agent. Generating public/private rsa key pair. Add your SSH private key to the ssh-agent and store your passphrase in the keychain. If you created your key with a different name.

If you know your old password

If you know your old password, use that password to update your existing login keychain:

Open the Keychain Access app, which is in the the Utilities folder of your Applications folder.
From the list of keychains on the left side of the window, select 'login.'
From the Edit menu in the menu bar, choose “Change Password for Keychain 'login.'”
Enter the old password of your user account in the Current Password field. This is the password you were using before the password was reset.
Enter the new password of your user account in the New Password field. This is the password you're now using to log in to your Mac. Enter the same password in the Verify field.
Click OK when done, then quit Keychain Access.

Create both asymmetric and symmetric cryptographic keys.

Overview

Very often, you retrieve a key from an identity, a certificate, or the keychain, or with some other method described in Getting an Existing Key. Sometimes, however, you need to create your own keys.

Creating an Asymmetric Key Pair

An asymmetric cryptographic key pair is composed of a public and a private key that are generated together. You distribute the public key freely, but you keep the private key secret. One or both may be stored in a keychain for safekeeping.

You create an asymmetric key pair by first creating an attributes dictionary:

At a minimum, you specify the type and size of keys to create using the kSecAttrKeyType and kSecAttrKeySizeInBits parameters, respectively. The above example indicates 2048-bit RSA keys, though other options are available.

You then optionally add a kSecPrivateKeyAttrs parameter with a subdictionary that characterizes the private key. By assigning a value of true to the private key’s kSecAttrIsPermanent attribute, you store it in the default keychain while creating it. You also specify the kSecAttrApplicationTag attribute with a unique NSData value so that you can find and retrieve it from the keychain later. The tag data is constructed from a string, using reverse DNS notation, though any unique tag will do.

You could add a kSecPublicKeyAttrs attribute to the attributes dictionary, specifying a distinct tag and keychain storage for the public key. However, it’s typically easier to store only the private key and then generate the public key from it when needed. That way you don’t need to keep track of another tag or clutter your keychain.

For a complete list of available key attributes, see Key Generation Attributes.

Note

Be sure that you don’t generate multiple, identically tagged keys. These are difficult to tell apart during retrieval, unless they differ in some other, searchable characteristic. Instead, use a unique tag for each key generation operation, or delete old keys with a given tag using SecItemDelete(_:) before creating a new one with that tag.

You then call the SecKeyCreateRandomKey(_:_:) function with the attributes dictionary:

If the function fails to create a key, as indicated by a NULL return value, it fills in the error parameter to indicate the reason for failure. Otherwise, the key reference points to a new private key that’s ready for use. The key is also stored in the default keychain, from where you can read it later, as described in Storing Keys in the Keychain. If you need the corresponding public key (now or later), call the SecKeyCopyPublicKey(_:) function with the private key reference:

In Objective-C, when you’re done with these key references, however you obtained them, you are responsible for releasing the associated memory:

Creating a Symmetric Key

Asymmetric key cryptography is useful because it enables secure communication between two players who don’t share a secret ahead of time. However, it’s not ideal for bulk data transfer, because it’s computationally expensive and because it operates on small, fixed-sized chunks of data. Symmetric key cryptography, on the other hand, is computationally efficient. It allows you to handle data streams of arbitrary length but requires that both sender and receiver, and no one else, know the secret key.

To get the best of both worlds, you often use asymmetric cryptography to communicate a symmetric cryptographic key that you then use for bulk data transfer. When you do this with the certificate, key, and trust services API, you don’t explicitly create the symmetric key yourself. Instead, you call SecKeyCreateEncryptedData(_:_:_:_:) to create a symmetric key for you. This function creates the symmetric key, uses it to encrypt your data, and then encrypts the key itself with the public key that you provide. It then packages all of this data together and returns it to you. You then transmit it to a receiver, who uses the corresponding private key in a call to SecKeyCreateDecryptedData(_:_:_:_:) to reverse the operation. For more details, see Using Keys for Encryption.