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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, 6745🔥, 0💬

OpenSSL "ans1parse" - BITWRAP and OCTWRAP Modifiers
What are BITWRAP and OCTWRAP modifiers in the configuration file for the OpenSSL "asn1parse" command? BITWRAP and OCTWRAP modifiers in OpenSSL configuration files are used to automatically wrap a SEQUENCE structure into a BIT STRING or OCTET STRING field. The test below is a demonstration of using B...
2016-09-28, 6721🔥, 0💬

OpenSSL "ans1parse" - DH Public Key in ASN.1 Structure
How to view the ASN.1 structure of an DH public key using the OpenSSL "asn1parse" command? You can use the OpenSSL "asn1parse" command to view the ASN.1 structure of an DH public key as shown in the test below: C:\Users\fyicenter&gt;\loc al\openssl\opensslpkey -in dh_pri.key -pubout -out dh_pub....
2016-09-26, 6492🔥, 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, 6455🔥, 0💬

OpenSSL "ans1parse -in" - Parse DER File
How to parse a DER file using the OpenSSL "ans1parse" command? You can parse a DER file with OpenSSL "ans1parse -inform DER -in" command as shown in the test below, assuming we have some DER file created from the previous tutorial: C:\Users\fyicenter&gt;\loc al\openssl\openssl.exeOpenSSL&gt;...
2016-10-15, 6372🔥, 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, 6339🔥, 0💬

OpenSSL "req -new" - DN Fields for Personal Certificates
How to use additional DN fields to create CSR for personal certificates? You can set additional DN fields in the configuration file to allow OpenSSL "req -new" command to generate CSR for personal certificates. Additional DN fields are: emailAddress, name, surname, givenName, initials and dnQualifie...
2016-10-27, 6337🔥, 0💬

OpenSSL "ans1parse" - Configuration File for RSA Private Key
Can I build an RSA private key from an OpenSSL configuration file? Yes, you can build an RSA private key from an OpenSSL configuration file, if you know the components of the key, as shown in the test below: C:\Users\fyicenter&gt;type asn1_rsa_pri_key.cnf asn1 = SEQUENCE:rsa_pri_key [rsa_pri_key...
2016-09-27, 6335🔥, 0💬

OpenSSL "ans1parse" - Configuration File for RSA Public Key
Can I build an RSA public key from an OpenSSL configuration file? Yes, you can build an RSA public key from an OpenSSL configuration file, if you know the components of the key, as shown in the test below: C:\Users\fyicenter&gt;type asn1_rsa_pub_key.cnf asn1 = SEQUENCE:rsa_pub_key [rsa_pub_key] ...
2016-09-27, 6232🔥, 0💬

OpenSSL "pkey -pubout" - Extract EC Public Key
How to extract the public key from a EC key file using OpenSSL "pkey" command? If you want to extract the public key out from a EC key file (private key an public key), you can use the OpenSSL "pkey -pubout" command as shown below: C:\Users\fyicenter&gt;\loc al\openssl\openssl.exeOpenSSL&gt;...
2017-07-03, 6204🔥, 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, 6168🔥, 0💬

OpenSSL "ans1parse" - Configuration File for DH Private Key
Can I build a DH private key from an OpenSSL configuration file? Yes, you can build a DH private key from an OpenSSL configuration file, if you know the components of the key, as shown in the test below: C:\Users\fyicenter&gt;type asn1_dh_pri_key.cnf asn1 = SEQUENCE:dh_pri_key [dh_pri_key] versi...
2016-09-26, 6093🔥, 0💬

OpenSSL "ans1parse" - Wrap of SEQUENCE Structure
What is the wrap of an ASN.1 SEQUENCE structure? The wrap of an ASN.1 SEQUENCE structure is the binary string of ASN.1 SEQUENCE structure in DER format stored in an BIT STRING or OCTET STRING field in another ASN.1 SEQUENCE structure. The main purpose of using the SEQUENCE wrap is to make the SEQUEN...
2016-09-28, 6048🔥, 0💬

OpenSSL "ans1parse" - Wrap of Primitive Field
Can I wrap a primitive field into a BIT STRING or OCTET STRING field with the OpenSSL "asn1parse" command? Yes, you can wrap any ASN.1 primitive field into a BIT STRING or OCTET STRING field using the BITWRAP or OCTWRAP modifiers using the OpenSSL "asn1parse" command. The test below gives some demon...
2016-09-28, 5851🔥, 0💬

OpenSSL "ans1parse" - Configuration File for DH Public Key
Can I build a DH public key from an OpenSSL configuration file? Yes, you can build a DH public key from an OpenSSL configuration file, if you know the components of the key, as shown in the test below: C:\Users\fyicenter&gt;type asn1_dh_pub_key.cnf asn1 = SEQUENCE:dh_pri_key [dh_pri_key] algorit...
2016-09-26, 5759🔥, 0💬

OpenSSL "ans1parse" - Configuration File for DSA Public Key
Can I build a DSA public key from an OpenSSL configuration file? Yes, you can build a DSA public key from an OpenSSL configuration file, if you know the components of the key, as shown in the test below: C:\Users\fyicenter&gt;type asn1_dsa_pub_key.cnf asn1 = SEQUENCE:dsa_pub_key [dsa_pub_key] al...
2016-09-26, 5732🔥, 0💬

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, 5699🔥, 0💬

OpenSSL "ans1parse" - Configuration File for DSA Private Key
Can I build a DSA private key from an OpenSSL configuration file? Yes, you can build a DSA private key from an OpenSSL configuration file, if you know the components of the key, as shown in the test below: C:\Users\fyicenter&gt;type asn1_dsa_pri_key.cnf asn1 = SEQUENCE:dsa_pri_key [dsa_pri_key] ...
2016-09-26, 5687🔥, 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, 5613🔥, 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...
2021-04-24, 5488🔥, 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 "rsa" Command Options
What can I use OpenSSL "rsa" command for? What are options supported by the "rsa" command? OpenSSL "rsa" command is a utility to view RSA private keys and public keys. Here are options supported by the "rsa" command: C:\Users\fyicenter&gt;\loc al\openssl\openssl.exeOpenSSL&gt; rsa -help unkn...
2017-02-24, 5341🔥, 0💬

OpenSSL "req" - "prompt=yes" Mode
How to use the "prompt=yes" mode of the OpenSSL "req -new" command? I want to enter DN values at the command prompt. You can use "prompt=yes" mode of the OpenSSL "req -new" command as shown below, if you set "prompt=yes" and provide DN (Distinguished Name) field prompts in the configuration file. C:...
2016-10-30, 5315🔥, 0💬

OpenSSL Verify Operation Steps
How does the OpenSSL verify operation work? What are the steps used by OpenSSL to verify a certificate? The OpenSSL verify operation uses the same functions as the internal SSL and S/MIME verification, therefore this description applies to these verify operations too. There is one crucial difference...
2012-07-24, 5311🔥, 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, 5288🔥, 0💬

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