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OpenSSL "req" - distinguished_name Configuration Section
What is the distinguished_name section in the OpenSSL configuration file? The distinguished_name section in the OpenSSL configuration file is a required section of options when using OpenSSL "req -new" or "req -newkey" commands to generate a new CSR or self-signed certificate. distinguished_name sec...
2016-11-02, 3485👍, 0💬

OpenSSL "rsautl -oaep" - OAEP Padding Option
How to use OAEP padding with OpenSSL "rsautl" command? I was told to encrypt a password using an RSA public key with OAEP padding. OpenSSL "rsautl" uses PKCS#1 v1.5 padding as the default padding schema. So if you want to use OAEP padding, you have to using the "-oaep" option as shown below: C:\User...
2017-04-15, 3264👍, 0💬

OpenSSL "req" - X509 V3 Extensions Configuration Options
What are X509 V3 extensions options in the configuration file for the OpenSSL "req" command? X509 V3 extensions options in the configuration file allows you to add extension properties into x.509 v3 certificate when you use OpenSSL commands to generate CSR and self-signed certificates. X509 V3 exten...
2016-10-26, 3195👍, 0💬

OpenSSL "rsautl -verify" - RSA Signature Verification
What is the purpose of the OpenSSL "rsautl -verify" command? Can I use it to verify a signed document? Yes, you can use OpenSSL "rsautl -verify" command to verify a signed document. But you need other OpenSSL commands to generate a digest from the document first. For example, you received 3 files as...
2017-03-25, 3065👍, 0💬

OpenSSL "ca" Error "lookup failed for ca::serial"
Why I am getting the "variable lookup failed for ca::serial" error when running OpenSSL "ca" command? You are getting the "variable lookup failed for ca::serial" error, because OpenSSL "ca" command can not find the required "serial" option in the configuration file. For example, if you have the foll...
2016-09-08, 3041👍, 0💬

OpenSSL "ca" - "error while loading CRL number"
Why I am getting the "error while loading CRL number" error when running OpenSSL "ca -gencrl" command? If you are running the OpenSSL "ca -gencrl" command installed with the slproweb binary package for Windows, you may get the "error while loading CRL number" error as shown below: C:\Users\fyicenter...
2016-09-10, 2704👍, 0💬

OpenSSL "rsautl -encrypt -raw" - No Padding
Can I use OpenSSL "rsautl" command to encrypt data without any padding? Yes, you can encrypt data without any padding using the OpenSSL "rsautl -encrypt -raw" command. But you need to remember the following: No padding requires the input data to be the same size as the RSA key. No padding requires t...
2017-04-28, 2544👍, 0💬

OpenSSL "ecparam -list_curves" - List of EC Curves
What EC curves are supported by OpenSSL for generating EC keys? I want a list of all EC curves. If you want a list of all EC curves, you can use the OpenSSL "ecparam" command as shown below: C:\Users\fyicenter&gt;\loc al\openssl\opensslOpenSSL&gt; ecparam -list_curves secp112r1 : SECG/WTLS c...
2017-06-23, 2484👍, 0💬

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...
2017-05-12, 2418👍, 0💬

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:...
2016-12-14, 2277👍, 0💬

OpenSSL "req -new -reqexts" - Specify CSR V3 Extensions
How to specify x.509 v3 extensions options in the configuration file for generating CSR using the OpenSSL "req" command? You can use x.509 v3 extensions options when using OpenSSL "req -new" command to generate a CSR (Certificate Signing Request). The provided x509 extensions will be included in the...
2016-10-25, 2126👍, 0💬

Download OpenSSL 0.9.8h for Windows
How to download OpenSSL for Windows? I heard that OpenSSL is nice free tool to manage keys and certificates. You can download OpenSSL Windows version using these steps: 1. Go to the OpenSSL for Windows Web site. 2. Go to the line: "Complete package, except sources - Setup - 4658384 - 4 December 2008...
2016-09-04, 2074👍, 0💬

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...
2018-01-24, 2069👍, 2💬

💬 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 "req -pubkey" - Extract Public Key from CSR
How to extract the public key from a CSR using OpenSSL "req -pubkey" command? If you want to extract the public key from a CSR (Certificate Signing Request), you can use the OpenSSL "req -pubkey" command as shown below: C:\Users\fyicenter&gt;\loc al\openssl\openssl.exeOpenSSL&gt; req -in my_...
2016-11-20, 2068👍, 0💬

OpenSSL "ca" Error "failed to update database TXT_DB error number 2"
Why I am getting the "failed to update database TXT_DB error number 2" error when running OpenSSL "ca" command? If you are using the OpenSSL "ca" command to sign a CSR that has the same DN (Distinguished Name) fields as an old CSR you have signed before, you will get the "failed to update database T...
2016-09-13, 2056👍, 0💬

OpenSSL "req" - Good Sample openssl.conf
Where can I get a good sample configuration file openssl.conf for OpenSSL "req" command? Below is a good sample configuration file openssl.conf for OpenSSL "req" command with explanations: C:\Users\fyicenter&gt;type openssl.conf # Unnamed section of generic options # ... # ----------------------...
2016-09-23, 2033👍, 0💬

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&gt;\loc al\openssl\openssl.exeOpenSSL&...
2016-11-23, 2021👍, 0💬

OpenSSL "rsautl -encrypt -raw" - Data Too Large Error
Why am I getting the "data too large for key size" error with OpenSSL "rsautl -encrypt -raw" command? My input data is the same size as the RSA key and I am using no padding. In most case, you should be able to use the OpenSSL "rsautl -encrypt -raw" command to encrypt input data of the same size as ...
2017-04-22, 2015👍, 0💬

OpenSSL "req -new" - CSR Attributes
How to add attributes in new CSR using OpenSSL "req -new" command? I was asked to create a CSR with a challenge password an attribute. In order to add attributes to new CSR created by the OpenSSL "req -new" command, first you need to write attribute options in a named section in the configuration fi...
2016-09-23, 1939👍, 0💬

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&gt;...
2017-01-14, 1937👍, 0💬

OpenSSL "rsautl" - Encrypt Large File with RSA Key
How to encrypt a large file with an RSA public key using OpenSSL "rsautl" command? If you are trying to use an RSA public key to encrypt a file larger than the key size directly, you will get the "data too large for key size" error. One option to resolve the problem is to use the RSA-AES hybrid encr...
2017-06-07, 1935👍, 0💬

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, 1931👍, 1💬

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

OpenSSL "rsautl" Command for RSA Keys
Where to find tutorials on using OpenSSL "genpkey" and "rsautl" commands for RSA private keys? Here is a collection of tutorials on using OpenSSL "rsautl" command compiled by FYIcenter.com team to encrypt, decrypt, sign or verify data with RSA (Rivest, Shamir and Adleman) public and private keys. Op...
2017-05-29, 1929👍, 0💬

OpenSSL "genrsa" Command Options
What can I use OpenSSL "genrsa" command for? What are options supported by the "genrsa" command? OpenSSL "genrsa" command is a utility to generate RSA (Rivest, Shamir and Adleman) private key and public key pairs. Here are options supported by the "genrsa" command: C:\Users\fyicenter&gt;\loc al\o...
2017-02-24, 1918👍, 0💬

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