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OpenSSL "dsa" - Open Encrypted DSA Keys
How to open an encrypted DSA key file using OpenSSL "dsa" command? I was told the key file is DES encrypted and I know the password. If you are trying to open a password (encrypted) DSA key file using the "dsa" command, you will be prompted for the password as shown below: C:\Users\fyicenter&gt;...
2016-12-18, 1139👍, 0💬

OpenSSL "ca" - Create CSR for Testing
How to generate a new CSR to test the OpenSSL "ca" command? If you need some CSR (Certificate Signing Request) for testing purpose, you can generate them using the OpenSSL "req" command as shown below: C:\Users\fyicenter&gt;\loc al\OpenSSL-Win32\bin\openssl.e xeOpenSSL&gt; req -newkey rsa:102...
2016-09-18, 1137👍, 0💬

OpenSSL "req -new" - Repeating DN Fields
Can I repeat a DN field multiple times in the configuration file for the OpenSSL "req -new" command? Yes, you can repeat a DN (Distinguished Name) field multiple times in the configuration file. This can be done by prefix the DN field name with "0.", "1.", and so on. For example. "0.emailAddress=Ema...
2016-10-27, 1136👍, 0💬

OpenSSL "ca -selfsign" - Self Sign CSR
How to sign my own CSR to create a self-signed certificate using the OpenSSL "ca" command? You can use the OpenSSL "req -new -x509" command to generate a self-signed certificate from your private key. But you can also use the "ca -selfsign" command to generate a self-signed certificate from your CSR...
2016-09-09, 1132👍, 0💬

OpenSSL Signing Documents with RSA Keys
What is the process of signing a document with RSA keys using OpenSSL commands? I was told to deliver a document with digital signature. Here are steps your need to follow to sign a document with your RSA private key using OpenSSL commands: 1. Get the document to be signed ready. 2. Generate a diges...
2017-04-04, 1125👍, 0💬

OpenSSL "req" - "prompt=yes" Mode with DN Defaults
How to specify DN value defaults when using the "prompt=yes" mode of the OpenSSL "req -new" command? If you are using "prompt=yes" mode, you can also set DN (Distinguished Name) default values in the configuration file. OpenSSL will prompt the user for DN fields with default values. The user can pre...
2016-10-29, 1124👍, 0💬

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 ...
2016-11-05, 1106👍, 0💬

OpenSSL "rsa -aes*" - Re-Encrypt RSA Keys
How to re-encrypt an RSA key file using OpenSSL "rsa" command? I want to change the encryption password, and maybe change the encryption algorithm. If you want to encrypt an existing RSA key file again, you can use the "rsa -aes*" command as shown below: C:\Users\fyicenter&gt;\loc al\openssl\open...
2017-01-11, 1099👍, 0💬

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&gt;\loc al\openssl\openssl.exeOpenSSL&gt; rsa -in my_rsa.key -tex...
2017-02-03, 1096👍, 0💬

OpenSSL "genrsa 10240" - Generate RSA Long Keys
How to generate a new RSA key pair with a longer key size using OpenSSL "genrsa" command? If you need a new RSA key pair with a longer key size for testing purpose, you can use the OpenSSL "genrsa" command as shown below: C:\Users\fyicenter&gt;time The current time is: 22:03:25.43 C:\Users\fyice...
2017-01-29, 1091👍, 0💬

OpenSSL "genpkey -paramfile" - Generate DH Key
How to generate a new DH private key using OpenSSL "genpkey" command? If you need a new DH private key in order to create a new certificate, you can use the OpenSSL "genpkey" command as shown below: C:\Users\fyicenter&gt;\loc al\openssl\openssl.exeOpenSSL&gt; genpkey -paramfile my_dh.prm -ou...
2017-09-08, 1085👍, 0💬

OpenSSL Not Validate Signature in Self-Signed Certificate
Does OpenSSL "verify" command really validate the digital signature in a self-signed certificate? No, OpenSSL "verify" command does not validate the digital signature in a self-signed certificate. In the following test, a CSR with an RSA public key was "self-signed" by the OpenSSL "req -x509" comman...
2016-11-03, 1085👍, 0💬

OpenSSL "policy" Options for "ca" Command
What are policy options in the configuration file for the OpenSSL "ca" command? Policy options in the configuration file are used by the OpenSSL "ca" command for 2 purposes: Defines validation rules for DN (Distinguished Name) fields. Defines the order of DN (Distinguished Name) fields in the certif...
2016-09-04, 1081👍, 0💬

OpenSSL "dsa -pubout" - Extract DSA Public Key
How to extract the public key from a DSA key file using OpenSSL "dsa" command? If you want to extract the public key out from a DSA key file (private key an public key), you can use the OpenSSL "dsa -pubout" command as shown below: C:\Users\fyicenter&gt;\loc al\openssl\openssl.exeOpenSSL&gt;...
2016-12-28, 1078👍, 0💬

OpenSSL "dsa -aes*" - Re-Encrypt DSA Keys
How to re-encrypt a DSA key file using OpenSSL "dsa" command? I want to change the encryption password, and maybe change the encryption algorithm. If you want to encrypt an existing DSA key file again, you can use the "dsa -aes*" command as shown below: C:\Users\fyicenter&gt;\loc al\openssl\opens...
2016-12-15, 1078👍, 0💬

OpenSSL "ca" - Sign the CSR Again
How to sign the a CSR again the OpenSSL "ca" command? It was signed for 1 year the first time. But the requester wants the certificate to valid for 3 years. If you sign a CSR incorrectly and want to sign it again with the OpenSSL "ca" command, you need to revoke the certificate, then sign it again c...
2016-09-10, 1075👍, 0💬

OpenSSL "req -new -reqexts" - Test CSR V3 Extensions
How to run OpenSSL "req -new" command to generate CSR with x.509 v3 extensions? I have req_extensions option defined in the configuration file. If you want to run OpenSSL "req -new" command to generate CSR with x.509 v3 extensions, you can follow this example: C:\Users\fyicenter&gt;type test.cnf...
2016-10-25, 1072👍, 0💬

OpenSSL "verify" - Validate Self-Signed Certificate
How to validate a self-signed certificate using OpenSSL "verify" command? You can validate your self-signed certificate using the OpenSSL "verify" command as shown below: C:\Users\fyicenter&gt;\loc al\openssl\openssl.exeOpenSSL&gt; verify rsa_test.crt rsa_test.crt: C = us, ST = NY, L = New Y...
2016-11-15, 1062👍, 0💬

OpenSSL [ca] Section in Configuration File
How to provide OpenSSL "ca" command options in the configuration file? I see examples of using the [ca] section. Yes, you can use the [ca] section to help providing OpenSSL "ca" command options in the configuration file. But there are 4 ways to provide "ca" command options: 1. Using unnamed section ...
2016-09-09, 1060👍, 0💬

OpenSSL "req -text" Output and CSR Components
How to identify CSR components in OpenSSL "req -text" command output? OpenSSL "req -text" command output displays all components in a CSR with proper labels to help you identify each component. Below is a good example of the "req -text" command output: C:\Users\fyicenter&gt;\loc al\openssl\openss...
2016-11-23, 1050👍, 0💬

OpenSSL "pkeyparam" Command Options
What can I use OpenSSL "pkeyparam" command for? What are options supported by the "pkeyparam" command? OpenSSL "pkeyparam" command is a utility to view and manage key generation parameter files. Note that "pkeyparam" command is replacing the "dsaparam" command. Here are options supported by the "pke...
2017-12-26, 1044👍, 0💬

OpenSSL "ca" - Sign CSR with CA Certificate
How to sign a CSR with my CA certificate and private key using OpenSSL "ca" command? I think my configuration file has all the settings for the "ca" command. If you have you configuration file ready and all the required directories and files created, you can sign a CSR with your CA certificate and p...
2016-09-13, 1025👍, 0💬

OpenSSL Verify Signed Documents with RSA Keys
What is the process of verifying the signed document with RSA keys using OpenSSL commands? I received a signed document and was to verify it with senders RSA public key. Here are steps your need to follow to verify a signed document with sender's RSA public key using OpenSSL commands: 1. Verify that...
2017-03-27, 1023👍, 0💬

OpenSSL "genpkey -paramfile" - Generate DSA Key
How to generate a new DSA private key using OpenSSL "genpkey" command? If you need a new DSA private key in order to create a new certificate, you can use the OpenSSL "genpkey" command as shown below: C:\Users\fyicenter&gt;\loc al\openssl\openssl.exeOpenSSL&gt; genpkey -paramfile my_dsa.prm ...
2017-12-21, 1019👍, 0💬

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