openssl req -x509 … Now sign the CSR with 365 days validity and create t1.crt. Add mutable versions of X509_get0_notBefore and X509_get0_notAfter. openssl ca -config /path/to/myca.conf -in req.csr -out ourdomain.pem \ -startdate 0801010000Z -enddate 1001010000Z -startdate and -enddate do appear in the openssl sources and CHANGE log; as @guntbert noted, while they do not appear in the main man openssl page, they also appear in man ca: In the app\req.c you need to modify the "set_cert_times" call: That's why req supports the -days flag, as it passes it internally to the x509 command. If you really need to do this, you can modify the openssl source to do what you want. Using a system with a 64 bit time_t will avoid that. notAfter=Feb 01 … The modify add the options, also add this kinds options for "req" and "smime" command Rename X509_SIG_get0_mutable to X509_SIG_getm. In X509 manual has the statement "There should be options to explicitly set such things as start and end dates rather than an offset from the current time." However if you set -days to a large enough value you are at the mercy of the system time routines in versions of OpenSSL before 0.9.9-dev if they wrap around you'll get an invalid date. . #openssl x509 -req -startdate 120814050000Z -enddate 120814060000Z -in clientcert.csr -out clientcert.pem -CA cacert.pem -CAkey cakey.pem -CAcreateserial unknown option 120814050000Z usage: x509 args . $ openssl x509 -startdate -enddate -issuer -subject -hash -noout -in cacert.pem notBefore=Aug 13 00:29:00 1998 GMT notAfter=Aug 13 23:59:00 2018 GMT issuer= /C=US/O=GTE Corporation/OU=GTE CyberTrust Solutions, Inc./CN=GTE CyberTr ust Global Root subject= /C=US/O=GTE Corporation/OU=GTE CyberTrust Solutions, Inc./CN=GTE CyberT rust Global Root 4d654d1d $ openssl x509 … Assuming you have a certificate file located at: C:\Users\fyicenter\twitter.crt ,you can print out … $ openssl x509 -req -days 365 -in t1.csr -signkey key.pem -out t1.crt Self Sign CSR Print X.509 … The OpenSSL command-line tool can be used as a very crude CA, although it was mostly designed for debugging. Shell script to determine SSL certificate expiration date from the crt file itself and alert sysadmin. $ openssl req -x509 -sha256 -nodes -newkey rsa:4096 -keyout example.com.key -days 730 -out example.com.pem Creating your own CA and using it to sign the certificates. This is where -days should be specified. date --date=\"$(openssl x509 -in xxxxxx.crt -noout -startdate | cut -d= -f 2)\" --iso-8601 - (Output a SSL certificate start or end date A quick and simple way of outputting the start and end date of a certificate, you can simply use 'openssl x509 -in xxxxxx.crt -noout -enddate' to output the end date (ex. ... openssl x509 -req -in req.pem -config openssl.cnf -extensions v3_usr \ -CA cacert.pem -CAkey key.pem -CAcreateserial Set a certificate to be trusted for SSL client use and change set its alias to "Steve’s Class 1 CA" openssl x509 … -startdate - notBefore field -enddate - notAfter field . Ask Question Asked 2 years, 5 months ago. linux openssl … for years after 2049. X509(1openssl) OpenSSL X509(1openssl) NAME openssl-x509, x509 - Certificate display and signing utility SYNOPSIS openssl x509 [-inform DER|PEM|NET] [-outform DER|PEM|NET] [-keyform DER|PEM] [-CAform DER|PEM] [-CAkeyform DER|PEM] [-in filename] [-out filename] [-serial] [-hash] [-subject_hash] [-issuer_hash] [-ocspid] [-subject] [-issuer] [-nameopt option] [-email] [-ocsp_uri] [-startdate … openssl x509 -in cert.pem -noout -text: Display the "Subject Alternative Name" extension of a certificate: openssl x509 -in cert.pem -noout -ext subjectAltName: Display the more extensions of a certificate: openssl x509 -in cert.pem -noout -ext subjectAltName,nsCertType: Display the certificate serial number: openssl x509 … Active 2 years, 5 months ago. I need to see them and validate them with the owner of the certificate. [root]# openssl req -new -x509 -days 3650 -key my-ca.key -out my-ca.crt I get the message "unknown option x509" and the help menu for req options. What really seems odd to me that I can't change the start date … So far, I found this solution. openssl x509 -in server.crt -text -noout Check a key. signature. My commands for preparing a certificate: root@porteus:/mnt/sda1/porteus/base# openssl version OpenSSL 1.0.2o 27 Mar … In the source codes of OpenSSL, x509.c generates the content of a X.509 certificate (Figure 4), while the function “set_cert_time(X509 x, const char startdate, const char enddate, int days)” is to set the valid time (Algorithm 3). In case you need to change .pem format to .der. 1. . Verify the CSR and print CSR data filled in when generating the CSR: openssl req -text -noout -verify -in server.csr Verify a certificate and key matches . The SSL documentation But checking with x509 shows a valid not before: openssl x509 -in keys/example.org.crt -text Certificate: Data: Version: 3 (0x2) Serial Number: 6 (0x6) Signature Algorithm: sha512WithRSAEncryption Validity Not Before: Mar 4 00:00:00 2017 Not After : Apr 1 00:00:00 2018 I issued the certificated following tldp guide: openssl ca -config openssl … exponent. the validity. For a list of vulnerabilities, and the releases in which they were found and fixes, see our Vulnerabilities page. ... Affiche le contenu d'un certificat : openssl x509 -in cert.pem -noout -text Affiche le numéro de série du certificat : openssl x509 -in cert.pem -noout -serial Affiche le nom du sujet du certificat : openssl x509 … But: openssl req -x509 combines req and x509 into one; it generates a CSR and signs it, issuing a certificate in one go. The openssl command-line tool can be used as a very crude CA although... 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