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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, 1943👍, 0💬

OpenSSL "ca" Command
Where to find tutorials on using OpenSSL "ca" command? Here is a collection of tutorials on using OpenSSL "ca" command compiled by FYIcenter.com team. OpenSSL "ca" Command Options OpenSSL "ca" - Create CSR for Testing OpenSSL "ca" - Create CA Certificate for Testing OpenSSL "ca" Error "./demoCA/newc...
2016-09-23, 1941👍, 0💬

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...
2017-06-11, 1899👍, 0💬

OpenSSL "genpkey ec_paramgen_curve:secp521r1" - EC Long Keys
How to generate a new EC key pair with a longer key size using OpenSSL "genpkey" command? If you need a new EC key pair with a longer key size for testing purpose, you can use the OpenSSL "genpkey" command as shown below: C:\Users\fyicenter&gt;\loc al\openssl\opensslOpenSSL&gt; genpkey -genp...
2017-06-28, 1875👍, 0💬

Start OpenSSL on Windows Systems
How to start OpenSSL? Where is it located? I have installed OpenSSL for Windows 0.9.8h on my Windows computer. If you have OpenSSL for Windows installed, you can start the "openssl" command using these steps: 1. Go to the "C:\Program Files\GnuWin32\bin" folder. 2. Find openssl.exe and double-click o...
2016-09-04, 1830👍, 0💬

OpenSSL "ca" Error "stateOrProvinceName field needed to be the same"
Why I am getting the "The stateOrProvinceName field needed to be the same in the CA certificate (...) and the request (...)" 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 "The stateOrProvin...
2016-09-13, 1814👍, 0💬

OpenSSL "rsautl" Using OAEP Padding
What is the OAEP padding schema used in OpenSSL "rsautl" command? OAEP (Optimal Asymmetric Encryption Padding), also called PKCS#1 2.0, is a padding standard specified in RFC3447 "PKCS #1: RSA Encryption, Version 1.5" proposed by RSA Laboratories in 1998. OAEP padding can be illustrated by the diagr...
2017-04-22, 1791👍, 0💬

OpenSSL "rsautl -encrypt" vs. "rsautl -sign"
What is the difference between "rsautl -encrypt" and "rsautl -sign" commands? There are 2 differences between "rsautl -encrypt" and "rsautl -sign" commands: 1. "rsautl -encrypt" and "rsautl -sign" commands take different RSA keys: "rsautl -encrypt" only accepts an RSA public key and performs RSA enc...
2017-03-25, 1744👍, 0💬

OpenSSL "genpkey" Command for RSA Keys
Where to find tutorials on using OpenSSL "genpkey" and "pkey" commands for RSA private keys? Here is a collection of tutorials on using OpenSSL "genpkey" and "pkey" commands compiled by FYIcenter.com team to generate and manage RSA (Rivest, Shamir and Adleman) private keys OpenSSL "genpkey" Command ...
2018-01-24, 1743👍, 0💬

OpenSSL "rsa -pubin" - View RSA Public Key
How to view contents of an RSA public key file using OpenSSL "rsa" command? If you want to view contents of an RSA public key stored in a file, you can use the OpenSSL "rsa -pubin" command as shown below: C:\Users\fyicenter&gt;\loc al\openssl\openssl.exeOpenSSL&gt; rsa -in my_rsa_pub.key -pu...
2017-01-29, 1740👍, 0💬

OpenSSL "req -x509 -extensions" - Specify Self-Signed Certificate V3 Extensions
How to specify x.509 v5 extensions options in the configuration file for generating self-signed certificate using the OpenSSL "req -x509" command? You can use x.509 v3 extensions options when using OpenSSL "req -x509" command to generate a self-signed certificate. The provided x509 extensions will b...
2016-10-25, 1713👍, 0💬

OpenSSL "req -config" - Using Configuration File
Can I use my own configuration file when running "req" command? Yes, you can specify your own configuration file using the "-config file" option when running the "req" command. OpenSSL configuration file allows you to control the behavior of the "req" command with the following options: utf8 - If se...
2016-11-03, 1665👍, 0💬

OpenSSL "ca" Error "cannot lookup how many days ..."
Why I am getting the "cannot lookup how many days to certify for" error when running OpenSSL "ca" command? You are getting the "cannot lookup how many days to certify for" error, because OpenSSL "ca" command can not find the required "default_days" option in the configuration file. For example, if y...
2016-09-08, 1654👍, 0💬

OpenSSL "genpkey -genparam" - Generate EC Parameters
How to generate a new EC parameter file using OpenSSL "genpkey -genparam" command? If you need a new EC parameter file in order to create new EC keys, you can use the OpenSSL "genpkey -genparam" command as shown below: C:\Users\fyicenter&gt;\loc al\openssl\openssl.exeOpenSSL&gt; genpkey -gen...
2017-07-15, 1644👍, 0💬

OpenSSL "rsautl -encrypt" - Encryption with RSA Public Key
How to encrypt a file with an RSA public key using OpenSSL "rsautl" command? If you want to encrypt a file with an RSA public in order to send private message to the owner of the public key, you can use the OpenSSL "rsault -encrypt" command as shown below: C:\Users\fyicenter&gt;type clear.txt Th...
2017-06-11, 1615👍, 0💬

OpenSSL "genpkey" Command for EC Keys
Where to find tutorials on using OpenSSL "genpkey" and "pkey" commands for EC private keys? Here is a collection of tutorials on using OpenSSL "genpkey" and "pkey" commands compiled by FYIcenter.com team to generate and manage EC (Elliptic Curve) private keys OpenSSL "genpkey -genparam" - Generate E...
2017-07-15, 1608👍, 0💬

OpenSSL "ca" Command Options
What can I use OpenSSL "ca" command for? What are options supported by the "ca" command? OpenSSL "ca" command is a CA (Certificate Authority) tool. It can be used to sign CSR (Certificate Signing Request) in a variety of forms and generate CRLs. It also maintains a text database of issued certificat...
2016-09-18, 1602👍, 0💬

OpenSSL "pkey" - Open Encrypted EC Keys
How to open an encrypted EC key file using OpenSSL "pkey" command? I was told the key file is DES encrypted and I know the password. If you are trying to open a password (encrypted) EC key file using the "pkey" command, you will be prompted for the password as shown below: C:\Users\fyicenter&gt;...
2017-06-16, 1531👍, 0💬

OpenSSL "rsautl" - Decrypt Large File with RSA Key
How to decrypt a large file with an RSA private key using OpenSSL "rsautl" command? I received a large encrypted file from my friend who used the RSA-AES hybrid encryption process with my public key. If your friend encrypted a large file with the RSA-AES hybrid encryption process with your public ke...
2017-05-20, 1501👍, 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, 1463👍, 0💬

OpenSSL CSR File Structure and Components
What is the OpenSSL CSR file structure and components? By default, CSR (Certificate Signing Request) files generated by the OpenSSL "req" command follow these rules: 1. CSR files are stored in PEM (Privacy-enhanced mail) format, which uses DER (Distinguished Encoding Rules) standard to serialize dat...
2018-01-19, 1461👍, 1💬

💬 2018-01-19 guest: req -new -newkey rsa: 1024 -nodes -keyout mykey.pe>m -out myreq.pem -config openssl-san.cnf

OpenSSL "genpkey -pkeyopt rsa_keygen_pubexp:3" - RSA Public Exponent
How to generate a new RSA key pair with a different public exponent using OpenSSL "genpkey" command? If you need a new RSA key pair with a different public exponent for testing purpose, you can use the OpenSSL "genpkey -pkeyopt rsa_keygen_pubexp:nnn" command. The "-pkeyopt rsa_keygen_pubexp:nnn" opt...
2018-01-06, 1448👍, 0💬

OpenSSL "ca -gencrl" - Generate CRL
How to generate a CRL using the OpenSSL "ca" command? I need to publish the CRL to inform users about certificates I have revoked. If you want to generate a CRL (Certificate Revocation List), you can use the OpenSSL "ca -gencrl" command as shown below: C:\Users\fyicenter&gt;\loc al\OpenSSL-Win32\...
2016-09-10, 1425👍, 0💬

OpenSSL "rsautl -sign" - RSA Signature Generation
What is the purpose of the OpenSSL "rsautl -sign" command? Can I use it to sign a document? Yes, you can use OpenSSL "rsautl -sign" command to sign a document. But you need other OpenSSL commands to generate a digest from the document first as shown in the following test: C:\Users\fyicenter&gt;d...
2017-04-04, 1395👍, 0💬

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