I am using the following command in order to generate a CSR together with a private key by using OpenSSL. Openssl req -new -subj '/CN=sample.myhost.com' -out newcsr.csr -nodes -sha512 -newkey rsa:2048. 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. Openssl genrsa –des3 –out www.mydomain.com.key 2048 Note: If you do not wish to use a Pass Phrase, do not use the -des3 command. It will however leave the private key unprotected. Enter the PEM Pass Phrase (This MUST be remembered) 4. This will generate a 2048 RSA Private key, and stores it in the file www.mydomain.com.key.
Generate the CSR code and Private key for your certificate by running this command: openssl req -new -newkey rsa:2048 -nodes -keyout server.key -out servercsr.txt. Note: server.key and servercsr.txt are the Private key and the CSR code files. Feel free to use any file names, as long as you keep the.key and.txt extensions. Openssl genrsa –des3 –out www.mydomain.com.key 2048 Note: If you do not wish to use a Pass Phrase, do not use the -des3 command. It will however leave the private key unprotected. Enter the PEM Pass Phrase (This MUST be remembered) 4. This will generate a 2048 RSA Private key, and stores it in the file www.mydomain.com.key.
Generate a certificate signing request
Before you can install a Secure Socket Layer (SSL) certificate, you must first generate a certificate signing request (CSR). You can do this by using one of the following methods:
OpenSSL
The following sections describe how to use OpenSSL to generate a CSR for a single host name. If you want to generate a CSR for multiple host names, we recommend using the Cloud Control Panel or the MyRackspace Portal.
Install OpenSSL
Check whether OpenSSL is installed by using the following command:
If the preceding packages are not returned, install OpenSSL by running the following command:
Generate the RSA key
Run the following commands to create a directory in which to store your RSA key, substituting a directory name of your choice:
Run the following command to generate a private key:
Create a CSR![]()
Run the following command to create a CSR with the RSA private key (output is in Privacy-Enhanced Mail (PEM) format):
When prompted, enter the necessary information for creating a CSR by using the conventions shown in the following table.
Note: You cannot use the following characters in the Organization Name or Organizational Unit fields:
< > ~ ! @ # $ % ^ * / ( ) ? . , &
Warning: Leave the challenge password blank (press Enter).
Verify your CSR
Run the following command to verify your CSR:
After you have verified your CSR, you can submit it to a CA to purchase an SSL certificate.
Windows IIS Manager
Use the following steps to generate a CSR by using Windows IIS Manager:
Note: The following steps are for IIS 8 or IIS 8.5 on Windows Server 2012.
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After you have generated the CSR, you can submit it to a CA to purchase an SSL certificate.
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Cloud Control Panel
Rackspace provides the CSR Generator for generating a CSR. The CSR Generator shows you the CSRs that you currently have and lets you create new CSRs with a simple form. After you have entered your details, the generator combines them with your private key so that you can submit the combined encoded information to a CA.
The crew cd key generator free. When you are done with the generator, you can return to the Cloud Control Panel by clicking any of the links in the top navigation or by going to login.rackspace.com and selecting Rackspace Cloud from the drop-down product menu in the top navigation bar.
Access the CSR Generator
Access the CSR Generator directly or through the Control Panel by using the following steps:
The generator lists your existing CSRs, if you have any, organized by domain name.
Generate a CSR
It can take between 5 and 60 seconds for the CSR to be generated. You might need to refresh the page that displays your CSRs before the new CSR is listed.
View CSR details
When CSR has been generated, you can click its UUID (unique identifier) in the CSR list to view its details screen.
This screen displays the information that you provided, the text of the CSR, and its associated private key.
Openssl Generate Private KeySubmit the CSR to the CA
The text in the Certificate Request field is the CSR. It contains encoded details of the CSR and your public key.
To request your SSL certificate, copy the Certificate Request text and submit it to your CA. Include all the text, including the BEGIN and END lines at the beginning and end of the text block.
Install the private key
Copy the private key to the server that will host the certificate. See your application documentation to determine where to install the private key and certificate on your server.
MyRackspace Portal
If you are a Managed or Dedicated customer, you can request a CSR through the MyRackspace Portal by using the following steps:
Next stepsReferencePrivate Key DefinitionExperience what Rackspace has to offer.
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< Cryptography
Download and install the OpenSSL runtimes. If you are running Windows, grab the Cygwin package.
OpenSSL can generate several kinds of public/private keypairs.RSA is the most common kind of keypair generation.[1]
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Other popular ways of generating RSA public key / private key pairs include PuTTYgen and ssh-keygen.[2][3]
Generate an RSA keypair with a 2048 bit private key[edit]
Execute command: 'openssl genpkey -algorithm RSA -out private_key.pem -pkeyopt rsa_keygen_bits:2048'[4] (previously “openssl genrsa -out private_key.pem 2048”)
e.g.
Make sure to prevent other users from reading your key by executing chmod go-r private_key.pem afterward.
Generate 4098 Bit Key Generate 4096 Bit DSA Key. RSA is very old and popular asymmetric encryption algorithm. It is used most of the systems by default. There are some alternatives to RSA like DSA. We can not generate 4096 bit DSA keys because it algorithm do not supports. Generate 2048 Bit Key. The default key size for the ssh-keygen is 2048. Rsa 4096 key pair. This is a c function I wrote to generate openssl rsa 4096 bit keys. Bool rsagenkeys int ret = 0; RSA.rsa = NULL; BIGNUM.bignum = NU.
Extracting the public key from an RSA keypair[edit]
Generate public key from certificate java. Execute command: 'openssl rsa -pubout -in private_key.pem -out public_key.pem'
e.g.
A new file is created, public_key.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.However, OpenSSL has already pre-calculated the public key and stored it in the private key file.So this command doesn't actually do any cryptographic calculation -- it merely copies the public key bytes out of the file and writes the Base64 PEM encoded version of those bytes into the output public key file.[5]
Viewing the key elements[edit]
Execute command: 'openssl rsa -text -in private_key.pem'
All parts of private_key.pem are printed to the screen. This includes the modulus (also referred to as public key and n), public exponent (also referred to as e and exponent; default value is 0x010001), private exponent, and primes used to create keys (prime1, also called p, and prime2, also called q), a few other variables used to perform RSA operations faster, and the Base64 PEM encoded version of all that data.[6](The Base64 PEM encoded version of all that data is identical to the private_key.pem file).
Password-less login[edit]
Often a person will set up an automated backup process that periodically backs up all the content on one 'working' computer onto some other 'backup' computer.
Because that person wants this process to run every night, even if no human is anywhere near either one of these computers, using a 'password-protected' private key won't work -- that person wants the backup to proceed right away, not wait until some human walks by and types in the password to unlock the private key.Many of these people generate 'a private key with no password'.[7]Some of these people, instead, generate a private key with a password,and then somehow type in that password to 'unlock' the private key every time the server reboots so that automated toolscan make use of the password-protected keys.[8][3]
Further reading[edit]
Retrieved from 'https://en.wikibooks.org/w/index.php?title=Cryptography/Generate_a_keypair_using_OpenSSL&oldid=3622149'
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