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OpenSSL "verify" Command Options
What can I use OpenSSL "verify" command for? What are options supported by the "verify" command? OpenSSL "verify" command is a utility to verify certificates. Here are options supported by the "verify" command: C:\Users\fyicenter&gt;\loc al\openssl\openssl.exeOpenSSL&gt; verify -h usage: ver...
2012-07-24, 5085👍, 0💬

OpenSSL "ans1parse" - DSA Private Key in ASN.1 Structure
How to view the ASN.1 structure of an DSA private key using the OpenSSL "asn1parse" command? You can use the OpenSSL "asn1parse" command to view the ASN.1 structure of an DSA private key as shown in the test below: C:\Users\fyicenter&gt;\loc al\openssl\opensslgenpkey -genparam -algorithm dsa -ou...
2016-09-27, 5056👍, 0💬

OpenSSL "ans1parse" - DSA Public Key in ASN.1 Structure
How to view the ASN.1 structure of an DSA public key using the OpenSSL "asn1parse" command? You can use the OpenSSL "asn1parse" command to view the ASN.1 structure of an DSA public key as shown in the test below: C:\Users\fyicenter&gt;\loc al\openssl\opensslpkey -in dsa_pri.key -pubout -out dsa_...
2016-09-26, 5041👍, 0💬

OpenSSL "x509 -pubkey" - Export Public Key"
How to export the public key out from a certificate using OpenSSL "x509" command? You can export the public key out from a certificate using OpenSSL "x509 -pubkey" command as shown below: C:\Users\fyicenter&gt;\loc al\OpenSSL\opensslOpenSSL&gt; x509 -in twitter.crt -pubkey -noout &gt; tw...
2016-10-17, 4987👍, 0💬

OpenSSL Command Option to List All Options
How to list all options that are supported by a specific OpenSSL command? I know the command but I don't remember the options for that command. Interestingly, there is no "-h" option to show all options supported by a specific OpenSSL command. However, if you enter "-h" as an option following a comm...
2012-07-23, 4979👍, 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, 4916👍, 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, 4873👍, 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, 4867👍, 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, 4781👍, 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, 4743👍, 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, 4740👍, 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, 4735👍, 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, 4711👍, 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, 4704👍, 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, 4692👍, 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, 4692👍, 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, 4644👍, 0💬

OpenSSL "ca" Error "lookup failed for ca::default_md"
Why I am getting the "variable lookup failed for ca::default_md" error when running OpenSSL "ca" command? You are getting the "variable lookup failed for ca::default_md" error, because OpenSSL "ca" command can not find the required "default_md" option in the configuration file. For example, if you h...
2016-09-08, 4472👍, 0💬

Download and Install OpenSSL slproweb Binary for Windows
How to download OpenSSL for Windows? I heard that OpenSSL is a nice free tool to manage keys and certificates. You can download and install OpenSSL Windows version using these steps: 1. Go to the https://slproweb.com/products/ Win32OpenSSL.htmlWebsite. 2. Scroll down and select the latest version th...
2018-01-19, 4463👍, 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, 4144👍, 0💬

OpenSSL "ca" Error "... directory for new certificate ..."
Why I am getting the "there needs to be defined a directory for new certificate to be placed in" error when running OpenSSL "ca" command? You are getting the "there needs to be defined a directory for new certificate to be placed in" error, because OpenSSL "ca" command can not find the required "new...
2016-09-09, 4012👍, 0💬

OpenSSL "ca" Error "lookup failed for ca::policy"
Why I am getting the "variable lookup failed for ca::policy" error when running OpenSSL "ca" command? You are getting the "variable lookup failed for ca::policy" error, because OpenSSL "ca" command can not find the required "policy" option in the configuration file. For example, if you have the foll...
2016-09-08, 4009👍, 0💬

OpenSSL "req -verify" - Error "wrong signature length"
Why I am getting the "wrong signature length" error when running the OpenSSL "req -verify" command? If you are getting the "wrong signature length" error when running the OpenSSL "req -verify" command, the CSR you are trying to verify has invalid digital signature. There 2 main possibilities for a C...
2018-02-01, 3870👍, 0💬

OpenSSL "req" Command
Where to find tutorials on using OpenSSL "req" commands for certificate request and certificate generation? Here is a collection of tutorials on using OpenSSL "req" command compiled by FYIcenter.com team to generate Certificate Signing Request (CSR) and sign CSR. OpenSSL "req" Command Options OpenSS...
2016-12-15, 3847👍, 0💬

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