Oct 02, 2015 SSH Config and crypto key generate RSA command. Use this command to generate RSA key pairs for your Cisco device (such as a router). Keys are generated in pairs–one public RSA key and one private RSA key. If your router already has RSA keys when you issue this command, you will be warned and prompted to replace the existing keys with new keys.

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• October 2, 2015
• Posted by: Syed Shujaat
• Category: Cisco, Networking Solutions

1. We recommend using at least 1024-bit keys in production networks: Router1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router1(config)#crypto key generate rsa The name for the keys will be: Router1.oreilly.com Choose the size of the key modulus in the range of 360 to 2048 for your General Purpose Keys.
2. While Encrypting a File with a Password from the Command Line using OpenSSL is very useful in its own right, the real power of the OpenSSL library is its ability to support the use of public key cryptograph for encrypting or validating data in an unattended manner (where the password is not required to encrypt) is done with public keys.

Use this command to generate RSA key pairs for your Cisco device (such as a router). keys are generated in pairs–one public RSA key and one private RSA key.

If your router already has RSA keys when you issue this command, you will be warned and prompted to replace the existing keys with new keys.

NOTE: Before issuing this command, ensure that your router has a hostname and IP domain name configured (with the hostname and ipdomain-name commands).

You will be unable to complete the cryptokeygeneratersacommand without a hostname and IP domain name. (This situation is not true when you generate only a named key pair.)

Here are the steps to Enable SSH and Crypto Key setup : 2 config must requried for SSH

1 Setup Local VTY line User ID and password

router (Config) # Line VTY 0 15

router (Config-line)# login local

router (Config-line)# Exit

!!! create local login ID/Pass

router (Config)# username [loginid] password [cisco]

router (Config)# username loginid1 password cisco1

2. router (Config)# ip domain-name example.com

router (Config)# crypto key generate rsa

how many bits in the modulus [512] :1024

router (Config)# ip ssh version2

Rsa 1024 Key

router (Config)# CTRL Z

This command is not saved in the router configuration; however, the RSA keys generated by this command are saved in the private configuration in NVRAM (which is never displayed to the user or backed up to another device) the next time the configuration is written to NVRAM.

Modulus Length

When you generate RSA keys, you will be prompted to enter a modulus length. The longer the modulus, the stronger the security. However, a longer modules take longer to generate (see the table below for sample times) and takes longer to use.

The size of Key Modulus range from 360 to 2048. Choosing modulus greater than 512 will take longer time.

Cisco IOS software does not support a modulus greater than 4096 bits. A length of less than 512 bits is normally not recommended. In certain situations, the shorter modulus may not function properly with IKE, so we recommend using a minimum modulus of 2048 bits.

Syntax Description : Optional Strings to embed with SSH Crypto key

This section describes how to use the openssl command to set up SSL certificate and key files for use by MySQL servers and clients. The first example shows a simplified procedure such as you might use from the command line. The second shows a script that contains more detail. The first two examples are intended for use on Unix and both use the openssl command that is part of OpenSSL. The third example describes how to set up SSL files on Windows.

There are easier alternatives to generating the files required for SSL than the procedure described here: Let the server autogenerate them or use the mysql_ssl_rsa_setup program. See Section 5.3.1, “Creating SSL and RSA Certificates and Keys using MySQL”.

Whatever method you use to generate the certificate and key files, the Common Name value used for the server and client certificates/keys must each differ from the Common Name value used for the CA certificate. Otherwise, the certificate and key files will not work for servers compiled using OpenSSL. A typical error in this case is:

The following example shows a set of commands to create MySQL server and client certificate and key files. You will need to respond to several prompts by the openssl commands. To generate test files, you can press Enter to all prompts. To generate files for production use, you should provide nonempty responses.

After generating the certificates, verify them:

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You should see a response like this:

To see the contents of a certificate (for example, to check the range of dates over which a certificate is valid), invoke openssl like this:

Now you have a set of files that can be used as follows:

• ca.pem: Use this to set the ssl_ca system variable on the server side and the --ssl-ca option on the client side. (The CA certificate, if used, must be the same on both sides.)

• server-cert.pem, server-key.pem: Use these to set the ssl_cert and ssl_key system variables on the server side.

• client-cert.pem, client-key.pem: Use these as the arguments to the --ssl-cert and --ssl-key options on the client side.

For additional usage instructions, see Section 5.1, “Configuring MySQL to Use Encrypted Connections”.

Here is an example script that shows how to set up SSL certificate and key files for MySQL. After executing the script, use the files for SSL connections as described in Section 5.1, “Configuring MySQL to Use Encrypted Connections”.

Download OpenSSL for Windows if it is not installed on your system. An overview of available packages can be seen here:

Choose the Win32 OpenSSL Light or Win64 OpenSSL Light package, depending on your architecture (32-bit or 64-bit). The default installation location will be C:OpenSSL-Win32 or C:OpenSSL-Win64, depending on which package you downloaded. The following instructions assume a default location of C:OpenSSL-Win32. Modify this as necessary if you are using the 64-bit package.

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If a message occurs during setup indicating '..critical component is missing: Microsoft Visual C++ 2008 Redistributables', cancel the setup and download one of the following packages as well, again depending on your architecture (32-bit or 64-bit):

• Visual C++ 2008 Redistributables (x86), available at:

• Visual C++ 2008 Redistributables (x64), available at:

After installing the additional package, restart the OpenSSL setup procedure.

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During installation, leave the default C:OpenSSL-Win32 as the install path, and also leave the default option 'Copy OpenSSL DLL files to the Windows system directory'Free steam key generator 2013. selected.

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When the installation has finished, add C:OpenSSL-Win32bin to the Windows System Path variable of your server (depending on your version of Windows, the following path-setting instructions might differ slightly):

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1. On the Windows desktop, right-click the My Computer icon, and select Properties.

2. Select the Advanced tab from the System Properties menu that appears, and click the button.

3. Under System Variables, select Path, then click the button. The Edit System Variable dialogue should appear.

4. Add ';C:OpenSSL-Win32bin' to the end (notice the semicolon).

5. Press OK 3 times.

6. Check that OpenSSL was correctly integrated into the Path variable by opening a new command console (Start>Run>cmd.exe) and verifying that OpenSSL is available:

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After OpenSSL has been installed, use instructions similar to those from Example 1 (shown earlier in this section), with the following changes:

• Change the following Unix commands:

  On Windows, use these commands instead:

• When a ' character is shown at the end of a command line, this ' character must be removed and the command lines entered all on a single line.

After generating the certificate and key files, to use them for SSL connections, see Section 5.1, “Configuring MySQL to Use Encrypted Connections”.