OpenSSL "ans1parse" - Wrap of Primitive Field

Q

Can I wrap a primitive field into a BIT STRING or OCTET STRING field with the OpenSSL "asn1parse" command?

✍: FYIcenter.com

A

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 demonstrations of wrapping primitive field into BIT STRING or OCTET STRING:

C:\Users\fyicenter>\local\openssl\openssl 
   asn1parse -genstr BITWRAP,INTEGER:127 -dump
    0:d=0  hl=2 l=   4 prim: BIT STRING
      0000 - 00 02 01 7f                                       ....

C:\Users\fyicenter>\local\openssl\openssl 
   asn1parse -genstr OCTWRAP,INTEGER:127
    0:d=0  hl=2 l=   3 prim: OCTET STRING      [HEX DUMP]:02017F

C:\Users\fyicenter>\local\openssl\openssl 
   asn1parse -genstr OCTWRAP,INTEGER:128
    0:d=0  hl=2 l=   4 prim: OCTET STRING      [HEX DUMP]:02020080
    
C:\Users\fyicenter>\local\openssl\openssl 
   asn1parse -genstr OCTWRAP,INTEGER:-0x01
    0:d=0  hl=2 l=   3 prim: OCTET STRING      [HEX DUMP]:0201FF

C:\Users\fyicenter>\local\openssl\openssl 
   asn1parse -genstr OCTWRAP,IA5STRING:"1234"
    0:d=0  hl=2 l=   6 prim: OCTET STRING      [HEX DUMP]:160431323334

C:\Users\fyicenter>\local\openssl\openssl 
   asn1parse -genstr OCTWRAP,OBJECT:2.5.4.3
    0:d=0  hl=2 l=   5 prim: OCTET STRING      [HEX DUMP]:0603550403

C:\Users\fyicenter>\local\openssl\openssl 
   asn1parse -genstr OCTWRAP,BITSTRING:"1234"
    0:d=0  hl=2 l=   7 prim: OCTET STRING      [HEX DUMP]:03050031323334

C:\Users\fyicenter>\local\openssl\openssl 
   asn1parse -genstr OCTWRAP,FORMAT:HEX,BITSTRING:41424344
    0:d=0  hl=2 l=   7 prim: OCTET STRING      [HEX DUMP]:03050041424344
    
C:\Users\fyicenter>\local\openssl\openssl 
   asn1parse -genstr OCTWRAP,FORMAT:HEX,OCTETSTRING:41424244
    0:d=0  hl=2 l=   6 prim: OCTET STRING      [HEX DUMP]:040441424244

⇒ OpenSSL "ans1parse" - DER (Distinguished Encoding Rules)

⇐ OpenSSL "ans1parse" - BITWRAP and OCTWRAP Modifiers

⇑ OpenSSL "ans1parse" Command

⇑⇑ OpenSSL Tutorials

2016-09-28, 5523👍, 0💬

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How to view the ASN.1 structure of an RSA public key using the OpenSSL "asn1parse" command? You can use the OpenSSL "asn1parse" command to view the ASN.1 structure of an RSA public key as shown in the test below: C:\Users\fyicenter>\loc al\openssl\opensslpkey -in rsa_pri.key -pubout -out rsa_... 2016-09-27, 8313👍, 0💬

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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, 7757👍, 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, 6122👍, 0💬

OpenSSL "ans1parse" - Configuration File for RSA Private Key
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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>type asn1_rsa_pub_key.cnf asn1 = SEQUENCE:rsa_pub_key [rsa_pub_key] ... 2016-09-27, 5608👍, 0💬

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