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OpenSSL "req -new -reqexts" - Specify CSR V3 Extensions
How to specify x.509 v3 extensions options in the configuration file for generating CSR using the OpenSSL "req" command? You can use x.509 v3 extensions options when using OpenSSL "req -new" command to generate a CSR (Certificate Signing Request). The provided x509 extensions will be included in the...
2016-10-25, 999👍, 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, 845👍, 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, 410👍, 0💬

ASN.1 File Structure Supported by OpenSSL
What is the ASN.1 (or ASN1) file structure supported by OpenSSL? ASN.1 (Abstract Syntax Notation One) is a standard and notation that describes rules and structures for representing, encoding, transmitting, and decoding data in telecommunications and computer networking. ASN.1 defines how data of mu...
2016-10-17, 4695👍, 0💬

OpenSSL "ans1parse" Command
Where to find tutorials on using OpenSSL "ans1parse" command? Here is a collection of tutorials on using OpenSSL "ans1parse" command compiled by FYIcenter.com team. OpenSSL "ans1parse" Command Options ASN.1 File Structure Supported by OpenSSL ASN.1 Field Types Supported by OpenSSL OpenSSL "ans1parse...
2016-10-17, 4635👍, 0💬

OpenSSL "x509 -pubout" - Export Public Key"
How to calculate the subject key identifier of a certificate uisng OpenSSL commands? I want to see if it matches the "X509v3 Subject Key Identifier" in the certificate. Accoding to the RFC5280 - Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile", the ...
2016-10-17, 4581👍, 0💬

OpenSSL "ans1parse" Command Options
What can I use OpenSSL "ans1parse" command for? What are options supported by the "ans1parse" command? OpenSSL "ans1parse" command is a diagnostic utility that can parse ASN.1 file structures. It can also be used to extract data from ASN.1 files. Here are options supported by the "ans1parse" command...
2016-10-17, 4538👍, 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, 4520👍, 0💬

ASN.1 Field Types Supported by OpenSSL
What are ASN.1 field types supported by the OpenSSL "ans1parse" command? OpenSSL "ans1parse" command supports the following ASN.1 field types: BOOLEAN, BOOL - This encodes a boolean type. The value string is mandatory and should be TRUE or FALSE. Additionally TRUE, true, Y, y, YES, yes, FALSE, false...
2016-10-15, 4683👍, 0💬

OpenSSL "ans1parse -genconf" - Nested SEQUENCE ASN.1 Structure
How to how generate a DER with a nested SEQUENCE ASN.1 structure using the OpenSSL "ans1parse" command? You can define a nested SEQUENCE ASN.1 structure in an OpenSSL configuration file and use the "ans1parse -genconf" command to generate a DER with the structure as shown in the test below: C:\Users...
2016-10-15, 4638👍, 0💬

OpenSSL "ans1parse -genconf" - Configuration File
How to generate a DER file with a configuration file using the OpenSSL "ans1parse" command? You can use the OpenSSL configuration file to define an ASN.1 structure and call OpenSSL "ans1parse -genconf config_file" command to generate a DER file by respecting the following rules: 1. Use "ans1parse -g...
2016-10-15, 4611👍, 0💬

OpenSSL "ans1parse -genstr" - Single Primitive Field DER File
How to generate a DER file with a single data field using the OpenSSL "ans1parse" command? You can use the OpenSSL "ans1parse -genstr" command to generate a DER file with a single data field. You just need to specify the field type and field value separated by ":". Here are some examples of using "a...
2016-10-15, 4549👍, 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, 4421👍, 0💬

OpenSSL "ans1parse" - ASN.1 INTEGER Field Type
How to how extra an ASN.1 child structure using the OpenSSL "ans1parse" command? ASN.1 INTEGER field is a primitive field that can be used to store signed integers of any size. To use ASN.1 INTEGER field in OpenSSL "asn1parse" command, you need to remember the following rules: ASN.1 INTEGER type tag...
2016-09-30, 4997👍, 0💬

OpenSSL "ans1parse" - ASN.1 IA5STRING Field Type
How to how extra an ASN.1 child structure using the OpenSSL "ans1parse" command? ASN.1 IA5STRING field is a primitive field that can be used to store IA5 (ISO 646) character strings. IA5 character set is generally equivalent to ASCII character set. To use ASN.1 IA5STRING field in OpenSSL "asn1parse"...
2016-09-30, 4588👍, 0💬

OpenSSL "ans1parse" - ASN.1 BIT STRING Field Type
What is ASN.1 BIT STRING field type? How to specify BIT STRING field type in OpenSSL "asn1parse" command? ASN.1 BIT STRING field is a primitive field that can be used to store bit strings of any size. To use ASN.1 BIT STRING field in OpenSSL "asn1parse" command, you need to remember the following ru...
2016-09-30, 4842👍, 0💬

OpenSSL "ans1parse -strparse" - Extract ASN.1 Sub Structure
How to how extra an ASN.1 child structure using the OpenSSL "ans1parse" command? You can use the OpenSSL "ans1parse -strparse offset" command to extract an ASN.1 child structure from a nested ASN.1 structure. as shown in the test below: C:\Users\fyicenter&gt;\loc al\openssl\openssl.exeOpenSSL&am...
2016-09-30, 4790👍, 0💬

OpenSSL "ans1parse" - ASN.1 OBJECT IDENTIFIER Field Type
What is ASN.1 OBJECT IDENTIFIER field type? How to specify OBJECT IDENTIFIER field type in OpenSSL "asn1parse" command? ASN.1 OBJECT IDENTIFIER field is a primitive field that can be used to store an Object Identifier (OID) defined in the ASN.1 standard. An OID has 3 equivalent values: short name, l...
2016-09-30, 4669👍, 0💬

OpenSSL "ans1parse" - ASN.1 OCTET STRING Field Type
What is ASN.1 OCTET STRING field type? How to specify OCTET STRING field type in OpenSSL "asn1parse" command? ASN.1 OCTET STRING field is a primitive field that can be used to store byte strings of any size. To use ASN.1 OCTET STRING field in OpenSSL "asn1parse" command, you need to remember the fol...
2016-09-28, 4791👍, 0💬

OpenSSL "ans1parse" - DER (Distinguished Encoding Rules)
What is the DER (Distinguished Encoding Rules) encoding used in the OpenSSL "asn1parse" command? DER (Distinguished Encoding Rules) is an encoding schema to convert an ASN.1 data structure into a binary string. In other words, DER is a serialization schema for the ASN.1 data structure. DER is one th...
2016-09-28, 4548👍, 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, 4418👍, 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, 4390👍, 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, 4324👍, 0💬

OpenSSL "ans1parse" - RSA Private Key in ASN.1 Structure
How to view the ASN.1 structure of an RSA private key using the OpenSSL "asn1parse" command? You can use the OpenSSL "asn1parse" command to view the ASN.1 structure of an RSA private key as shown in the test below: C:\Users\fyicenter&gt;\loc al\openssl\opensslgenrsa -out rsa_pri.key 512 Generati...
2016-09-27, 4495👍, 0💬

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