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Asked: 2026-05-11T01:25:04+00:00

Can somebody advise me what this code does and how can I convert it

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Can somebody advise me what this code does and how can I convert it to Ruby in most simple way?

    #!perl      use Convert::ASN1;      my $asn1 = Convert::ASN1->new(encoding => 'DER');     $asn1->prepare(q<         Algorithm ::= SEQUENCE {             oid OBJECT IDENTIFIER,             opt ANY OPTIONAL         }         Signature ::= SEQUENCE {             alg Algorithm,             sig BIT STRING         }     >);     my $data = $asn1->encode(sig => $body,         alg => {oid => sha512WithRSAEncryption()});

It’s a piece of a mexumgen, Perl library which sign update.rdf for Mozilla products with openssl.

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1 Answer

  1. This particular example can be converted as 

    data = ['308191300b06092a864886f70d01010d03818100' + body.unpack('H*')].pack('H*')

    where ‘308191300b06092a864886f70d01010d03818100’ is prefix made from that ASN expression up to BIT STRING field (including size of BIT STRING), pack(‘H’) converts binary data to hex representation and unpack(‘H’) converts string in hex back to binary.

    But for more general ASN converter it’s better to use OpenSSL::ASN1, which comes with ruby as standard library. It’s completely undocumented but some people managed to have some use of it

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