Certificate Signing Request (CSR or certification request) is a message in the PKCS #10 specification, sent from an applicant to a certificate authority of the public key infrastructure (PKI) in order to apply for a digital identity certificate.
Below is an online tool to generate a CSR online along with an RSA key pair. Any user just need to provide basic details such as country, common name, etc. to generate the CSR instantly.
Here is the other tool to generate RSA Key pair online for free.
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We do not store, log any key you enter. This tool runs entirely over a secure HTTPS connection to keep your encryption key safe at all times.
Enter the form fields such as common name, org, org unit, email, etc and click on the Generate CSR button to generate the private key and the CSR.
The private key can again be downloaded with the click of the button.
The CSR usually contains the public key for which the certificate should be issued, identifying information (such as a domain name) and a proof of authenticity including integrity protection (e.g., a digital signature).
Generating a CSR file with open SSL
openssl req -new -newkey rsa:2048 -nodes -out servername.csr -keyout servername.key
Open SSL Command to Decode a CSR
openssl req -in server.csr -noout -text
.key is the private key of the standard PKCS#8 structure.This is generally stored at the server and only accessible by the key owner.
.csr or .req or sometimes .p10 stands for Certificate Signing Request as defined in PKCS#10; This is a request for a certificate authority to sign the key.it contains information such as the public key and common name required by a Certificate Authority to create and sign a certificate for the requester, the encoding could be PEM or DER.
.crt is the certificate produced by the certificate authority that verifies the authenticity of the key. (The key itself is not included.) This is given to other parties, e.g. HTTPS client.
.pem Privacy Enhanced Mail (PEM) files are a type of Public Key Infrastructure (PKI) file used for keys and certificates. It could be any of the above files including a public key, a private key, or both, because a PEM file is not a standard.
.jks stands for Java Key Store. It can be used to store private keys with their certificate chains (root CA, intermediate CA's, leaf certificates or just a single self-signed certificate), certificates of other parties (usually but not necessarily CAs) to form a trust store, or both.