Internet Security Certificate Information Center: OpenSSL

FYIcenter HTTPS Server Certificate Checker
How to verify an HTTPS server certificate? To help you to verify an HTTPS server certificate and view its detailed information, including the server certificate, FYIcenter.com has designed this online tool. All you need to do is to paste the HTTPS server URL into the input box and click the "Go" but... 2025-07-04, ≈114🔥, 20💬

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OpenSSL "ca" Error "lookup failed for ca::default_ca"
Why I am getting the "variable lookup failed for ca::default_ca" error when running OpenSSL "ca" command? You are getting the "variable lookup failed for ca::default_ca" error, because OpenSSL "ca" command can not find the required "default_ca" option in the configuration file. For example, if you h... 2024-03-12, ≈52🔥, 2💬

💬 2024-03-12 Chris: Thanks for this :)

💬 2022-04-11 yaqeen: openssl ca -config myCA_openssl.cnf -policy policy_anything \ -md sha256 -days 3650 \ -in server.csr -out server.crt -batch \ -c...

OpenSSL "rsa" - Open Encrypted RSA Keys
How to open an encrypted RSA key file using OpenSSL "rsa" command? I was told the key file is DES encrypted and I know the password. If you are trying to open a password (encrypted) RSA key file using the "rsa" command, you will be prompted for the password as shown below: C:\Users\fyicenter>... 2024-01-19, ∼5250🔥, 1💬

OpenSSL "rsa -text" - Print RSA Key in Text
How to print RSA private key contents in text format using OpenSSL "rsa" command? If you want to see contents of an RSA private key in text format, you can use the OpenSSL "rsa -text" command as shown below: C:\Users\fyicenter>\loc al\openssl\openssl.exeOpenSSL> rsa -in my_rsa.key -tex... 2024-01-12, ≈17🔥, 1💬

💬 2024-01-12 kizner: is there a way to read it as text without using openssl?

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... 2023-10-12, ≈27🔥, 6💬

💬 2023-10-12 Gulam: openssl rand -base64 32

💬 2022-05-12 Said: openssl req -new -newkey rsa:2048 -nodes -out likedimi.com.rsa.csr -keyout likedimi.com.rsa.pkey -subj "/C=ES/ST=Barcelona/L=Bar...

💬 2021-08-06 a: openssl req -new x509 -nodes -out server.crt -keyout server.key

(More comments ...)

OpenSSL "genrsa 32" - Generate RSA Short Keys
How to generate a new RSA key pair with a shorter key size using OpenSSL "genrsa" command? If you need a new RSA key pair with a shorter key size for testing purpose, you can use the OpenSSL "genrsa" command as shown below: C:\Users\fyicenter>\loc al\openssl\openssl.exeOpenSSL> genrsa ... 2023-09-21, ≈10🔥, 3💬

💬 2023-09-21 fredy: Good

💬 2020-10-17 FYIcenter.com: @vena, the answer is yes as shown in this tutorial.

💬 2020-10-16 vena: can we already generate 32 bits key with openssl ?

OpenSSL "rsautl" Using PKCS#1 v1.5 Padding
What is the PKCS#1 v1.5 padding schema used in OpenSSL "rsautl" command? PKCS#1 v1.5 padding schema is a padding standard specified in RFC2313 "PKCS #1: RSA Encryption, Version 1.5" proposed by RSA Laboratories in 1998. PKCS#1 v1.5 padding schema is designed to pad input data to a full encryption bl... 2023-09-07, ≈10🔥, 1💬

OpenSSL "req -x509 -md5" - MD5 Digest for Signing
Can I using MD5 digest algorithm when generating a self-signed certificate using the OpenSSL "req -x509" command? Yes, you can use MD5 digest algorithm when generating a self-signed certificate using the OpenSSL "req -x509 -md5" command Without the "-md5" option, the default SHA256 digest algorithm ... 2023-08-31, ∼5770🔥, 1💬

💬 2023-08-31 Kadhirvel B: Pls valid signature for my profile any digital government documents

OpenSSL "req -verify" - Verify Signature of CSR
How to verify the digital signature inside a CSR using OpenSSL "req -verify" command? If you want to verify the digital signature inside a CSR (Certificate Signing Request), you can use the OpenSSL "req -verify" command as shown below: C:\Users\fyicenter>\loc al\openssl\openssl.exeOpenSSL&... 2023-05-26, ≈10🔥, 1💬

💬 2023-05-26 Breck: -----BEGIN CERTIFICATE REQUEST----- MIICszCCAZsCAQAwbjELMAkGA1UEBhMCRUUx ETAPBgNVBAgMCEhhcmp1bWFhMRAwDgYDVQQH DAdUYWxsaW5uMRgwFgYD...

OpenSSL "req" Command Options
What can I use OpenSSL "req" command for? What are options supported by the "req" command? OpenSSL "req" command is a certificate request and certificate generating utility. It can be used to generate Certificate Signing Request (CSR) and sign CSR. Here are options supported by the "req" command: C:... 2023-04-05, ≈11🔥, 1💬

💬 2023-04-05 Hermine242: openssl req-x509 -nodes -days 365 -newkey rsa:2048 -keyout /etc/apache2/ssl/apache.key -out /etc/apache2/ssl/apache.crt

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... 2022-07-26, ≈50🔥, 4💬

💬 2022-07-26 FYIcenter.com: Thanks for the suggestion!

💬 2022-07-26 flash: in openssl.cfg file give double slash in folder path dir = C:\\OpenSSL-Win64\\bin\\demoCA

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

(More comments ...)

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 ... 2022-06-11, ≈27🔥, 1💬

💬 2022-06-11 Egberts: How to make specific certificates like TLS client, CRL revocation, Software certificate, email encryption, intermediate certific...

Simple Working Configuration File for OpenSSL "ca"
Where to find a simple configuration file example for the OpenSSL "ca" command? Here is a simple configuration file example for the OpenSSL "ca" command: # Unnamed section of generic options # ------------------------------ ------------------------------ ------# Section for the "default_ca" option # ... 2022-06-05, ∼3646🔥, 1💬

💬 2022-06-05 Samsung security: "-----BEGIN PGP PUBLIC KEY BLOCK----- Version: GnuPG v2 mQENBFYgRV4BCAC/eG0McyQUPzSTKDILPd2n 4F4gIu+46uvY1mlPgRiVZAEy6MyA057xUqc...

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... 2021-11-19, ≈40🔥, 1💬

💬 2021-11-19 ts.gil.com.pk: openssl req -new -newkey rsa:2048 -nodes -sha256 -out ts_gil_com_pk.csr -keyout ts_gil_com_pk.key -subj "/CN=ts.gil.com.pk/C=US"

OpenSSL "rsautl -decrypt" - Decryption with RSA Private Key
How to decrypt a file with the RSA private key using OpenSSL "rsautl" command? I received a file that is encrypted with my RSA public key. If you receive a file encrypted with your RSA public key and want to decrypt the file with your RSA private key, you can use the OpenSSL "rsault -decrypt" comman... 2021-06-28, ≈28🔥, 2💬

💬 2021-06-28 THONG NGO: BitcoinVN

💬 2021-06-21 reza: Thanks

OpenSSL rsautl "data too large for key size" Error
Why am I getting the "data too large for key size" error, when using OpenSSL "rsautl" command to encrypt a large file? Because of the nature of the RSA algorithm, a single encryption process can only encrypt input data that is smaller than the modulus value of the RSA key. In other words, the size (... 2021-05-04, ≈48🔥, 1💬

OpenSSL "s_client" Command
Where to find tutorials on using OpenSSL "s_client" command? Here is a collection of tutorials on using OpenSSL "s_client" command compiled by FYIcenter.com team. OpenSSL "s_client" Command Options OpenSSL "s_client -connect" - Connect to HTTPS Web Site OpenSSL "s_client -connect" - View Server Cert... 2021-04-24, ∼6127🔥, 5💬

💬 2018-01-24 FYIcenter.com: @Janathan, what are you trying to say with that command?

💬 2018-01-24 Jonathan: openssl s_client -showcerts yum.******.org:443

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... 2021-01-16, ≈23🔥, 1💬

💬 2021-01-16 Rodrigo Barahona: Comentaros

OpenSSL "req -verify" - Error "wrong signature length"
Why I am getting the "wrong signature length" error when running the OpenSSL "req -verify" command? If you are getting the "wrong signature length" error when running the OpenSSL "req -verify" command, the CSR you are trying to verify has invalid digital signature. There 2 main possibilities for a C... 2020-10-03, ≈16🔥, 1💬

OpenSSL "x509" Command
Where to find tutorials on using OpenSSL "x509" command? Here is a collection of tutorials on using OpenSSL "x509" command compiled by FYIcenter.com team. OpenSSL "x509" Command Options Sample X.509 Certificate File to Test OpenSSL OpenSSL "x509 -text" - Print Certificate Info OpenSSL "x509 -fingerp... 2019-09-04, ∼5877🔥, 1💬

💬 2019-09-04 chintu: openssl genpkey -algorithm B -out A

OpenSSL - Certificate Management Toolkit - 23 Tutorials
Do you want to learn how to use OpenSSL as a certificate management tool? Here is a collection of 23 easy-to-follow tutorials on OpenSSL: How to download and install OpenSSL on Windows systems? How to print out X.509 certificate information? How to connect to a HTTPS Web server? How to validate an X... 2018-10-22, ∼6053🔥, 0💬

OpenSSL "x509 -x509toreq" - Conver Certificate to CSR
How to convert a certificate to a CSR using OpenSSL "x509" command? I want to generate a CSR with the same information as my existing certificate. You can convert a certificate to a CSR using the OpenSSL "x509 -x509toreq" command as shown below: C:\Users\fyicenter>\loc al\openssl\openssl.exeO... 2018-02-14, ∼9391🔥, 0💬

OpenSSL "x509 -req" - Error "my_ca.srl: No error"
Why I am getting the "my_ca.srl: No error" error when trying to sign a CSR with OpenSSL "x509" command? You are getting the "my_ca.srl: No error" error when using OpenSSL "x509" command to sign a CSR, because OpenSSL is not able to access the default serial number file: my_ca.srl. When using "x509" ... 2018-02-08, ≈14🔥, 0💬

OpenSSL "verify" Command
Where to find tutorials on using OpenSSL "verify" command? Here is a collection of tutorials on using OpenSSL "verify" command compiled by FYIcenter.com team. OpenSSL "verify" Command Options OpenSSL Verify Operation Steps OpenSSL Fulgan Binary Crash on Windows 7 OpenSSL "verify" - Verify or Validat... 2018-02-08, ∼2732🔥, 0💬

OpenSSL "x509 -req" - Quick Way to Sign CSR
How to sign a CSR with OpenSSL "x509" command? I want a quick way to sign a CSR without setting the OpenSSL "ca" command. Normally, you should set up OpenSSL "ca" command to sign a CSR. But if you want quick alternative, you can use the "x509" command to sign a CSR as shown in the test below: C:\Use... 2018-02-01, ∼2798🔥, 0💬

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