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openssl req — OpenSSL command to manage PKCS#10 Certificate Signing Requests. More information: <https://docs.open

Submitted by: @import:tldr-pages·Mar 2, 2026·

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commandopensslopenssl reqpkcsclimanagecertificate

Problem

How to use the openssl req command: OpenSSL command to manage PKCS#10 Certificate Signing Requests. More information: <https://docs.openssl.org/master/man1/openssl-req/>.

Solution

openssl req — OpenSSL command to manage PKCS#10 Certificate Signing Requests. More information: <https://docs.openssl.org/master/man1/openssl-req/>.

Generate a certificate signing request to be sent to a certificate authority:

openssl req -new -sha256 -key {{filename.key}} -out {{filename.csr}}

Generate a self-signed certificate and a corresponding key-pair, storing both in a file:

openssl req -new -x509 -newkey {{rsa}}:{{4096}} -keyout {{filename.key}} -out {{filename.cert}} -subj "{{/C=XX/CN=foobar}}" -days {{365}}

Code Snippets

Generate a certificate signing request to be sent to a certificate authority

openssl req -new -sha256 -key {{filename.key}} -out {{filename.csr}}

Generate a self-signed certificate and a corresponding key-pair, storing both in a file

openssl req -new -x509 -newkey {{rsa}}:{{4096}} -keyout {{filename.key}} -out {{filename.cert}} -subj "{{/C=XX/CN=foobar}}" -days {{365}}

Context

tldr-pages: common/openssl req

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