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OpenSSL "req -new -x509" - Generate Self-Signed Certificate
How to generate a new self-signed certificate using OpenSSL "req -new -x509" command? I have an RSA private key (including public key) ready. If you have a pair of RSA private key and public key, and you want to generate a self-signed certificate to represent your personal identity or server identit...
2016-11-12, ∼3644🔥, 0💬

OpenSSL "req -newkey" - Generate Private Key and CSR
How to generate a new private key with a public key and generate a CSR (Certificate Signing Request) using a single OpenSSL "req" command? If you do not have a pair of private key and public key, and you want to generate CSR (Certificate Signing Request) to represent your personal identity or server...
2016-11-12, ∼3619🔥, 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, ∼3599🔥, 0💬

OpenSSL "pkey -text" - Print EC Key in Text
How to print private key contents in text format using OpenSSL "pkey" command? If you want to see contents of a private key in text format, you can use the OpenSSL "pkey -text" command as shown below: C:\Users\fyicenter&gt;\loc al\openssl\openssl.exeOpenSSL&gt; pkey -in my_ec.key -text -noou...
2017-07-21, ∼3585🔥, 0💬

OpenSSL "req -x509 -extensions" - Test Self-Signed Certificate V3 Extensions
How to run OpenSSL "req -509" command to generate self-signed certificate with x.509 v3 extensions? I have x509_extensions option defined in the configuration file. If you want to run OpenSSL "req -509" command to generate self-signed certificate with x.509 v3 extensions, you can follow this example...
2016-09-23, ∼3572🔥, 0💬

OpenSSL "ca" - Create CA Certificate for Testing
How to generate a new root CA certificate to test the OpenSSL "ca" command? If you need some root CA (Certificate Authority) certificates 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&...
2016-09-18, ∼3568🔥, 0💬

OpenSSL Fulgan Binary Crash on Windows 7
Why am I getting an error when running OpenSSL "verify" command? I am using the OpenSSL Fulgan binary version. If you running OpenSSL 1.0.2h Fulgan binary version on a Windows 7 system, you can try to run the following OpenSSL "verify" command: C:\Users\fyicenter&gt;\loc al\openssl\openssl.exeOp...
2018-01-27, ∼3536🔥, 0💬

OpenSSL "dsa -text" - Print DSA Key in Text
How to print DSA private key contents in text format using OpenSSL "dsa" command? If you want to see contents of a DSA private key in text format, you can use the OpenSSL "dsa -text" command as shown below: C:\Users\fyicenter&gt;\loc al\openssl\openssl.exeOpenSSL&gt; dsa -in my_dsa_2048.key ...
2017-01-05, ∼3489🔥, 0💬

OpenSSL "genpkey -pkeyopt rsa_keygen_pubexp:1" - Bad RSA Key
Can I use 1 as the public exponent to generate an RSA private key? No. Using public exponent of 1 will generate identical RSA private key and public key as shown below: C:\Users\fyicenter&gt;\loc al\openssl\opensslOpenSSL&gt; genpkey -algorithm rsa -out rsa_test.key -pkeyopt rsa_keygen_bits:...
2018-01-06, ∼3456🔥, 0💬

OpenSSL "genpkey -pkeyopt rsa_keygen_pubexp:2" Runs Forever
What will happen if I use 2 as the public exponent to generate an RSA private key? OpenSSL will run forever, if you use 2 as the public exponent to generate an RSA private key, because OpenSSL can no find any private exponent to meet the RSA requirements. See the test below: C:\Users\fyicenter&g...
2017-09-08, ∼3450🔥, 0💬

OpenSSL "dsa -pubin" - View DSA Public Key
How to view contents of a DSA public key file using OpenSSL "dsa" command? If you want to view contents of a DSA public key stored in a file, you can use the OpenSSL "dsa -pubin" command as shown below: C:\Users\fyicenter&gt;\loc al\openssl\openssl.exeOpenSSL&gt; dsa -in my_dsa_2048_pub.key ...
2016-12-28, ∼3431🔥, 0💬

OpenSSL "req" - "prompt=yes" Mode with DN Validations
How to specify DN value length limit validations 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) value length limits in the configuration file. OpenSSL will perform value length validations for you. For ...
2016-10-30, ∼3430🔥, 0💬

OpenSSL "ca -config" - Using Configuration File
Can I use my own configuration file when running "ca" command? Yes, you can specify your own configuration file using the "-config file" option when running the "ca" command. OpenSSL configuration file allows you to control the behavior of the "ca" command with the following options: certificate - T...
2016-09-09, ∼3422🔥, 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, ∼3318🔥, 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, ∼3300🔥, 0💬

OpenSSL "genpkey -genparam" - Generate DH Parameters
How to generate a new DH parameter file using OpenSSL "genpkey -genparam" command? If you need a new DH parameter file in order to create new DH keys, you can use the OpenSSL "genpkey -genparam" command as shown below: C:\Users\fyicenter&gt;\loc al\openssl\openssl.exeOpenSSL&gt; genpkey -gen...
2017-11-02, ∼3296🔥, 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, ∼3286🔥, 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, ∼3284🔥, 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, ∼3278🔥, 0💬

OpenSSL "dsaparam 512" - Generate DSA Short Keys
How to generate a new DSA key pair with a shorter key size using OpenSSL "gendsa" command? If you need a new DSA key pair with a shorter key size for testing purpose, you can use the OpenSSL "gendsa" command as shown below: C:\Users\fyicenter&gt;\loc al\openssl\openssl.exeOpenSSL&gt; dsapara...
2016-12-24, ∼3240🔥, 0💬

OpenSSL "genpkey dh_paramgen_prime_len:256" - DH Short Keys
How to generate a new DH key pair with a longer key size using OpenSSL "genpkey" command? If you need a new DH 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...
2017-09-01, ∼3237🔥, 0💬

OpenSSL "pkey" - Open Encrypted RSA Keys
How to open an encrypted RSA 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) RSA key file using the "pkey" command, you will be prompted for the password as shown below: C:\Users\fyicenter&g...
2017-12-26, ∼3226🔥, 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, ∼3165🔥, 0💬

OpenSSL "genpkey dh_paramgen_generator:3" - DH Param Generator
How to use a different DH key generation parameter generator with OpenSSL "genpkey -genparam" command? When you use OpenSSL "genpkey -genparam -algorithm dh" command to generate DH key generation parameters, the default generator 2 will be used. You can change it by using the "-pkeyopt dh_paramgen_g...
2017-07-25, ∼3159🔥, 0💬

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