Issue the following command at a shell prompt (by default, Mac OS Terminal uses a bash shell): ssh-keygen -t rsa -b 2048. This will create a RSA public/private key pair in the.ssh directory below your account’s home directory. For example: Location: /.ssh (where is the home directory) Private key. Jun 28, 2012 Mac OS X Server. Exporting a Certificate and Private Key from Keychain. Thread starter chrisgrange; Start date Aug 3, 2009; C. Chrisgrange Registered. Aug 3, 2009 #1 I've recently upgraded our web server and wanted to export the SSL certs from our old one to our new one. (IPSCA) I did not create a private key password. I can't find any.
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Generate RSA keys with SSH by using PuTTYgen
One effective way of securing SSH access to your cloud server is to usea public-private key pair. This means that a public key is placed onthe server and a private key is placed on your local workstation.Using a key pair makes it impossible for someone to log in by using justa password, as long as you set up SSH to deny password-basedauthentication.
This article provides steps for generating RSA keys by using PuTTYgen onWindows for secure SSH authentication with OpenSSH.
Generate keys
In Windows, use PuTTYgen to generate your public and private keys.
- If needed, download PuTTYgen from the PuTTY download page.(PuTTYgen might have been installed previously with PuTTY or WinSCP.)
- Launch the program, and then click the Generate button.The program generates the keys for you.
- Enter a unique key passphrase in the Key passphrase andConfirm passphrase fields.For additional information about using passphrases,see Log in with a SSH Private Key on Windows.
- Save the public and private keys by clicking the Save public keyand Save private key buttons.
- From the Public key for pasting into OpenSSH authorized_keys filefield at the top of the window, copy all the text (starting with ssh-rsa)to your clipboard by pressing Ctrl-C.You need this key available on your clipboard to paste eitherinto the public key tool in the Control Panel or directly into theauthorized keys on your cloud server.
Use the key pair
You can use the RSA key pair in the following ways.
Specify your SSH key when creating a new cloud server
When you create a cloud server, you can assign a public key from the list of keys.If your key is not already in the list, you may add it, and then assign it.
Add a new public key to the list
- Under Advanced Options on the Create Server page, click Manage SSHKeys.
- Select public key for the cloud server from the SSH Keys listand click Add Public Key.
- Enter the key name, select the region, and paste the entire publickey into the Public Key field. Then click Add Public Key.
- Go back to the Create Server page, and confirm that your key is listedin the SSH Key list.
Assign a public key
- Under Advanced Options on the Create Server page, select the publickey you want to use from the SSH key drop-down menu.
- When you are done specifying the all the other details for the server,click Create Server.
Assign your SSH Key to an existing cloud server
To make use of your newly generated RSA key pair, you must tell PuTTY touse it when connecting to your cloud server.
- To edit the file (or create it), run the following command on the cloud server:
- Paste the text onto its own line in the file.You must have the key available in your clipboard to paste it. The key and itsassociated text (the ssh-rsa identified at the start and the comment at the end)must be on one line in the file. If the text is word-wrapped onto multiple linesan error might occur when connecting.
- If you created the authorized_keys file, change its permissionsafter you’re done editing it by running the following command:
- Open PuTTY, and go to the SSH > Auth section.
- Browse to the location of the key file, and load the private key.
- Go to the Session page, and save the session. This saves the configurationso that PuTTY uses the key every time that you connect to your cloudserver.
After you save your session, your key is loaded automatically when youconnect to your server.
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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:
![Key Key](/uploads/1/2/6/0/126074218/248796300.jpg)
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.How To Generate Public Key And Private Key In Mac
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. Unable to generate and persist a random session key error. 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
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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.See Also
Storing Keys in the Secure EnclaveCreate an extra layer of security for your private keys.
func SecKeyCreateRandomKey(CFDictionary, UnsafeMutablePointer<Unmanaged<CFError>?>?) -> SecKey?
func SecKeyCopyPublicKey(SecKey) -> SecKey?
Gets the public key associated with the given private key.
Generate Public Key From Private Key Mac Air
Key Generation AttributesGenerate Public Key From Private Key Mac Os
Use attribute dictionary keys during cryptographic key generation.