create_extension( "authorityKeyIdentifier", "keyid:always", false)) create_extension( "subjectKeyIdentifier", "hash", false)) create_extension( "keyUsage", "ke圜ertSign, cRLSign", true)) create_extension( "basicConstraints", "CA:TRUE", true)) not_before + 2 * 365 * 24 * 60 * 60 # 2 years validity ef = OpenSSL :: X509 :: ExtensionFactory. subject # root CA's are "self-signed" root_ca. parse "/DC=org/DC=ruby-lang/CN=Ruby CA" root_ca. RFC 5280 - to make it a "v3" certificate root_ca. new 2048 # the CA's public/private key root_ca = OpenSSL :: X509 :: Certificate. SecureĬhoices are integers in the two-digit byte range and ideally not sequentialīut secure random numbers, steps omitted here to keep the example concise.
#Openssl get certificate serial number
Serial number is considered a security flaw for real certificates. Creating a root CA certificate and an end-entity certificate ¶ ↑įirst, we need to create a "self-signed" root certificate. Line tool is used for issuing certificates in a private PKI. Set up an independent PKI, similar to scenarios where the 'openssl' command The OpenSSL::X509 module provides the tools to Need to base their trust just on a selected few authorities that themselvesĪgain vouch for subordinate CAs issuing their certificates to end users. The public key infrastructure (PKI) model relies on trusted certificateĪuthorities ("root CAs") that issue these certificates, so that end users Servers serving pages over HTTPs use certificates to authenticate Certificates are typically used toīe able to associate some form of identity with a key pair, for example web Stored within the certificate and can be accessed in form of an OpenSSL::PKey. X.509 certificates are associated with a private/public key pair, typicallyĪ RSA, DSA or ECC key (see also OpenSSL::PKey::RSA, OpenSSL::PKey::DSA and OpenSSL::PKey::EC), the public key itself is new raw Saving a certificate to a file ¶ ↑Ī certificate may be encoded in DER format cert =.
read "cert.cer" # DER- or PEM-encoded certificate = OpenSSL :: X509 :: Certificate. Reading a certificate from a file ¶ ↑ĭER-encoded certificates and certificates encoded in OpenSSL's PEM format. ProvidesĪccess to a certificate's attributes and allows certificates to be readįrom a string, but also supports the creation of new certificates from Implementation of an X.509 certificate as specified in RFC 5280.
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