Generate A Key Rsa C++

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$ openssl rsa -pubout -in privatekey.pem -out publickey.pem writing RSA key A new file is created, publickey.pem, with the public key. It is relatively easy to do some cryptographic calculations to calculate the public key from the prime1 and prime2 values in the public key file.

  • Generate RSA keys with SSH by using PuTTYgen. Last updated on: 2016-06-23; Authored by: Rackspace Support; One effective way of securing SSH access to your cloud server is to use a public-private key pair. This means that a public key is placed on the server and a private key is placed on your local workstation. Using a key pair makes it.
  • Generating an RSA Key Pair Problem You want to use RSA to encrypt data, and you need to generate a public key and its corresponding private key. Solution Use - Selection from Secure Programming Cookbook for C and C Book.

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.

  1. If needed, download PuTTYgen from the PuTTY download page.(PuTTYgen might have been installed previously with PuTTY or WinSCP.)
  2. Launch the program, and then click the Generate button.The program generates the keys for you.
  3. 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.
  4. Save the public and private keys by clicking the Save public keyand Save private key buttons.
  5. 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.

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Use the key pair

You can use the RSA key pair in the following ways.

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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

  1. Under Advanced Options on the Create Server page, click Manage SSHKeys.
  2. Select public key for the cloud server from the SSH Keys listand click Add Public Key.
  3. Enter the key name, select the region, and paste the entire publickey into the Public Key field. Then click Add Public Key.
  4. Go back to the Create Server page, and confirm that your key is listedin the SSH Key list.

Assign a public key

  1. Under Advanced Options on the Create Server page, select the publickey you want to use from the SSH key drop-down menu.
  2. 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.

  1. To edit the file (or create it), run the following command on the cloud server:

  2. 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.

  3. If you created the authorized_keys file, change its permissionsafter you’re done editing it by running the following command:

  4. Open PuTTY, and go to the SSH > Auth section.

  5. Browse to the location of the key file, and load the private key.

  6. 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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The following example creates a named key container and adds a signature key pair and an exchange key pair to the container. This example can be run without problem even if the named key container and cryptographic keys already exist.

Note

An application should not use the default key container to store private keys. When multiple applications use the same container, one application may change or destroy the keys that another application needs to have available. It is recommended that applications use key containers that are linked to the application. Doing so reduces the risk of other applications tampering with keys that are necessary for an application to function properly.

This example demonstrates the following tasks and CryptoAPI functions:

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Generate A Key Rsa C++

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  1. It attempts to acquire the named key container. If the named key container does not already exist, it is created.
  2. If a signature key pair does not exist in the key container, it creates a signature key pair within the key container.
  3. If an exchange key pair does not exist in the key container, it creates an exchange key pair within the key container.

These operations only need to be performed once for each user on each computer. If the named key container and key pairs have already been created, this sample performs no operations.

This example uses the following CryptoAPI functions:

This example uses the function MyHandleError. The code for this function is included with the sample. Code for this and other auxiliary functions is also listed under General Purpose Functions.

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