Issuer: C=US, ST=Michigan, O=Internet Widgits Pty Ltd, CN=Validity Signature Algorithm: sha1WithRSAEncryption `openssl x509 -text -noout -in This provides output similar to: It is often helpful to examine a certificate to verify dates of validity, and match it with organizational information.Į.g. Subject: C=US, ST=Michigan, L=Grand Rapids, O=Internet Widgits Pty Ltd, CN=Subject Public Key Info:Ģf:40:9b:bb:fa:3f:2e:0a:71:7c:f7:7a:57:2c:09:ĭigital Signature, Non Repudiation, Key EnciphermentĭNS:DNS:Signature Algorithm: sha1WithRSAEncryptionĠ6:40:f5:c8:38:d9:f8:52:8d:62:3c:12:0c:b3:12:e4:64:88:Īfter a CSR has been sent to the CA (certificate authority) to be digitally signed, a certificate is issued and returned. `openssl req -text -noout -in This outputs the information in a form similar to: Sometimes, it’s helpful to examine an existing CSR to determine what information it contains (such as organizational information, FQDN, etc.):Į.g. `openssl req -config nf -nodes -new -newkey rsa:4096 -out -keyout # 5. `openssl req -config -nodes -new -newkey rsa: -out -keyout `Į.g. SubjectAltName = DNS.2 = This file is then passed into the openssl command when generating the new CSR: KeyUsage = nonRepudiation, digitalSignature, keyEncipherment OrganizationalUnitName = Organizational Unit Name (eg, section)ĬommonName = Common Name (e.g. StateOrProvinceName = State or Province Name (full name)Ġ.organizationName = Organization Name (eg, company)Ġ.organizationName_default = Internet Widgits Pty Ltd The file contains the following default `openssl` template, plus an additional section for `subjectAltNames`:ĭistinguished_name = req_distinguished_nameĬountryName = Country Name (2 letter code) The SANs can refer to wildly different domains, like `and `Generating a CSR with SANs requires using a separate configuration file to list the SANs. This differs from a wildcard certificate, which refers to all sub-domains of a given domain. SANs (subject alternative names) allow a single CRT to refer to multiple FQDNs. `openssl x509 -x509toreq -in -signkey -out # 4. `openssl x509 -x509toreq -in -signkey -out `Į.g. If there is an existing certificate and an existing key, a new CSR with the same information (organizational information, FQDN, etc.) can be easily generated: Generating a New CSR from Existing CRT and Key If the private key already exists, it can be used to generate a new CSR also:Į.g. `openssl req -nodes -new -newkey rsa:4096 -out -keyout # 2. `openssl req -nodes -new -newkey rsa: -out -keyout `Į.g. ![]() When generating (or regenerating) a SSL certificate, the first step is to create a new CSR (certificate signing request) with a new public/private key pair: However, there are a few key commands and patterns which I use most often and find very handy. The number of sub-commands and options for the openssl command (). ![]() ![]() Even though the () implementation of the TLS heartbeat protocol was broken, the `openssl` utility itself is still extremely useful for working with SSL certificates. With the recent (), I found myself frequently generating new SSL keys and certificates for Atomic and our customers.
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