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OpenSSL "ans1parse" - ASN.1 INTEGER Field Type
What is ASN.1 INTEGER field type? How to specify INTEGER field type in OpenSSL "asn1parse" command?
✍: FYIcenter.com
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:
Here are examples of using INTEGER with the OpenSSL "asn1parse" command:
C:\Users\fyicenter>\local\openssl\openssl.exe OpenSSL> asn1parse -genstr INTEGER:1 -out p1.der 0:d=0 hl=2 l= 1 prim: INTEGER :01 OpenSSL> asn1parse -genstr INTEGER:-1 -out n1.der 0:d=0 hl=2 l= 1 prim: INTEGER :-01 OpenSSL> asn1parse -genstr INTEGER:128 -out p128.der 0:d=0 hl=2 l= 2 prim: INTEGER :80 OpenSSL> asn1parse -genstr INTEGER:-128 -out n128.der 0:d=0 hl=2 l= 1 prim: INTEGER :-80 OpenSSL> asn1parse -genstr INTEGER:0x01 -out p1x.der 0:d=0 hl=2 l= 1 prim: INTEGER :01 OpenSSL> asn1parse -genstr INTEGER:-0x01 -out n1x.der 0:d=0 hl=2 l= 1 prim: INTEGER :-01 OpenSSL> exit C:\Users\fyicenter>bin2hex p1.der 020101 C:\Users\fyicenter>bin2hex n1.der 0201ff C:\Users\fyicenter>bin2hex p128.der 02020080 C:\Users\fyicenter>bin2hex n128.der 020180 C:\Users\fyicenter>bin2hex p1x.der 020101 C:\Users\fyicenter>bin2hex n1x.der 0201ff
Note that "bin2hex" is not a Windows command, You need to create your own tool to dump a binary file in hex format.
⇒ OpenSSL "ans1parse" - ASN.1 IA5STRING Field Type
⇐ OpenSSL "ans1parse -strparse" - Extract ASN.1 Sub Structure
2016-09-30, 6697👍, 0💬
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