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Save OpenSSL Command Output to File
How to save the output of an OpenSSL command into a file? I want to make a copy of the server certificate display in the "s_client -connect" command output. If want to save the output an OpenSSL command into a file, you need to run the entire OpenSSL command at the Windows command prompt with the Wi...
2012-07-24, 11396👍, 0💬

OpenSSL "x509 -fingerprint" - Print Certificate Fingerprint
How to print out MD5 and SHA-1 fingerprints of a certificate using OpenSSL "x509" command? I need to see them and validate them with the owner of the certificate. Assuming you have a certificate file located at: C:\Users\fyicenter\twitter.crt ,you can print out certificate fingerprints using the "x5...
2012-07-23, 10317👍, 0💬

OpenSSL "x509 -text" - Print Certificate Info
How to print out text information from a certificate using OpenSSL "x509" command? I want to see the subject and issuer of the certificate. Assuming you have a certificate file located at: C:\Users\fyicenter\twitter.crt ,you can print out certificate information in text format using the "x509 -text"...
2012-07-23, 9909👍, 0💬

Download and Install OpenSSL Fulgan Binary for Windows
How to download OpenSSL for Windows? I heard that OpenSSL is a nice free tool to manage keys and certificates. You can download and install OpenSSL Windows version using these steps: 1. Go to the https://indy.fulgan.com/SSL/ Website. 2. Search and select the latest version that matches your Windows ...
2017-03-07, 9860👍, 1💬

OpenSSL "s_client -connect" - Show Server Certificate Chain
How to show all certificates in the server certificate chain using the OpenSSL "s_client -connect" command? I know the server uses multiple intermediate CA certificates. You can get all certificates in the server certificate chain if use "s_client -connect" with the "-showcerts" option as shown belo...
2012-07-24, 8587👍, 0💬

OpenSSL "s_client -connect" - Connect to HTTPS Web Site
How to connect to a HTTPS Web site using OpenSSL? I see the Web sites using the "https:\" format. If you see a Web sites using the "https:\" format, for example https://twitter.com/login/, you can try to connect the Web site using the "x509 -connect" command as shown below: C:\Users\fyicenter&gt...
2012-07-24, 8416👍, 0💬

OpenSSL "x509" Command Options
What can I use OpenSSL "x509" command for? What are options supported by the "x509" command? OpenSSL "x509" command is a multi purpose certificate utility. It can be used to display certificate information, convert certificates to various forms, sign certificate requests like a "mini CA" or edit cer...
2012-07-23, 8252👍, 0💬

Sample X.509 Certificate File to Test OpenSSL
How can I get a X.509 certificate file to play with OpenSSL commands "x509" command? If you have no other easy way to get a sample X.509 certificate file, you can create one yourself using these steps: 1. Open "Notepad" with a black text file. 2. Copy and paste the following data into the "Notepad" ...
2012-07-23, 7521👍, 0💬

OpenSSL "s_client" Command Options
What can I use OpenSSL "s_client" command for? What are options supported by the "s_client" command? OpenSSL "s_client" command implements a generic SSL/TLS client which can establish a transparent connection to a remote server speaking SSL/TLS. It's intended for testing purposes only and provides o...
2012-07-23, 7345👍, 0💬

OpenSSL Tutorials
Where to find tutorials on using OpenSSL to manage certificate? Here is a collection of tutorials on managing certificates with OpenSSL compiled by FYIcenter.com team. Topics include installing OpenSSL on Windows, OpenSSL commands and options, validating certificates, etc. General Information about ...
2016-11-23, 6560👍, 0💬

OpenSSL "verify -CAfile" - Specify Root CA Certificate
How to specify the root CA certificates that close the signing chain for the server certificate for OpenSSl "verify" command? I have downloaded the root CA certificate in a file. If you have the root CA certificate downloaded in a file, you can provide it to the OpenSSL "verify" command using the "-...
2012-07-24, 6520👍, 0💬

Run OpenSSL Commands
How to run OpenSSL commands? I have OpenSSL installed on my Windows computer. If you have OpenSSL for Windows installed, you can run OpenSSL commands in two ways: 1. Run a single OpenSSL command at the Windows command prompt by entering "openssl <command>" together. The following examp...
2012-07-23, 6369👍, 0💬

OpenSSL "verify -untrusted" - Specify Untrusted Certificate
How to specify those intermediate CA certificates that form the signing chain for the server certificate for OpenSSl "verify" command? I have the certificate chain from the server saved in a file. If you have the server certificate chain saved in a file, you can provide it to the OpenSSL "verify" co...
2012-07-24, 6232👍, 0💬

OpenSSL "verify" - Verify or Validate Certificate
How to verify or validate a certificate using OpenSSL "verify" command? I got a certificate from the Web site server and want to see if it is valid. If you have a certificate stored in a file, you can try to validate it or verify it with the OpenSSL "verify" command as shown below: C:\Users\fyicente...
2012-07-24, 6191👍, 0💬

OpenSSL "ca" Error "./demoCA/newcerts: No such file or directory"
Why I am getting the "./demoCA/newcerts: No such file or directory" error when running OpenSSL "ca" command? If you are running the OpenSSL "ca" command installed with the slproweb binary package for Windows, you may get the "./demoCA/newcerts: No such file or directory" error as shown below: C:\Use...
2017-02-21, 6074👍, 2💬

💬 2017-02-21 FYIcenter.com: Hi sanakhan, thanks for the suggestion.

💬 2017-02-20 sanakhan: its simple just make another demoCA folder inside demoCA and put all files e.g certs,newcerts and serial text file inside it it ...

Install OpenSSL 0.9.8h on Windows
How to install OpenSSL on Windows? I have downloaded the "openssl-0.9.8h-1-setup.exe" on the desktop. If you have "openssl-0.9.8h-1-setup.exe" available, you can install OpenSSL 0.9.8h on Windows using these steps: 1. Double-click on "openssl-0.9.8h-1-setup.exe" to start the installation wizard. 2. ...
2012-07-23, 5870👍, 0💬

Download Root CA Certificate
How to download the certificate from a root CA? I need to the root CA certificate to close the certification validation chain. If you know the CN (Common Name) of the root CA, for example "DigiCert High Assurance EV Root CA", you can search and download it our certificate database at certificate.fyi...
2012-07-24, 5672👍, 0💬

OpenSSL "s_client -connect" - View Server Certificate
How to view the server certificate using the OpenSSL "s_client -connect" command? You can get the server certificate, if use "s_client -connect" without the "-quiet" option as shown below: C:\Users\fyicenter>\loc al\openssl\openssl.exeOpenSSL> s_client -connect www.twitter.com:443 CONN...
2012-07-24, 5595👍, 0💬

Start OpenSSL from Working Directory
How to start OpenSSL from my working directory where I have certificates stored. You can start OpenSSL from a command line window as shown in the tutorial: 1. Open a command line window. 2. Use the "cd" command to go to your working directory. 3. Run the OpenSSL program with the full path name as sh...
2012-07-23, 5254👍, 0💬

OpenSSL "ans1parse" - ASN.1 INTEGER Field Type
How to how extra an ASN.1 child structure using the OpenSSL "ans1parse" command? ASN.1 INTEGER field is a primitive field that can be used to store signed integers of any size. To use ASN.1 INTEGER field in OpenSSL "asn1parse" command, you need to remember the following rules: ASN.1 INTEGER type tag...
2016-09-30, 4997👍, 0💬

OpenSSL "ans1parse" - ASN.1 BIT STRING Field Type
What is ASN.1 BIT STRING field type? How to specify BIT STRING field type in OpenSSL "asn1parse" command? ASN.1 BIT STRING field is a primitive field that can be used to store bit strings of any size. To use ASN.1 BIT STRING field in OpenSSL "asn1parse" command, you need to remember the following ru...
2016-09-30, 4841👍, 0💬

OpenSSL "ans1parse" - ASN.1 OCTET STRING Field Type
What is ASN.1 OCTET STRING field type? How to specify OCTET STRING field type in OpenSSL "asn1parse" command? ASN.1 OCTET STRING field is a primitive field that can be used to store byte strings of any size. To use ASN.1 OCTET STRING field in OpenSSL "asn1parse" command, you need to remember the fol...
2016-09-28, 4791👍, 0💬

OpenSSL "ans1parse -strparse" - Extract ASN.1 Sub Structure
How to how extra an ASN.1 child structure using the OpenSSL "ans1parse" command? You can use the OpenSSL "ans1parse -strparse offset" command to extract an ASN.1 child structure from a nested ASN.1 structure. as shown in the test below: C:\Users\fyicenter>\loc al\openssl\openssl.exeOpenSSL&am...
2016-09-30, 4790👍, 0💬

What Is OpenSSL
What is OpenSSL? OpenSSL is a robust, commercial-grade, full-featured, and Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols as well as a full-strength general purpose cryptography library. OpenSSL is maintained by a worldwide commu...
2012-07-22, 4779👍, 0💬

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