22 lines
640 B
Ruby
Executable File
22 lines
640 B
Ruby
Executable File
#!/usr/bin/ruby
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require 'openssl'
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def extension_from_cert(cert, extension_id)
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x509 = OpenSSL::X509::Certificate.new(cert)
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extensions_hash = Hash[x509.extensions.collect { |ext| [ext.oid, ext.to_der()] }]
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asn1_body = nil
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if extensions_hash[extension_id]
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asn1 = OpenSSL::ASN1.decode(extensions_hash[extension_id])
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OpenSSL::ASN1.traverse(asn1.value[1]) do| depth, offset, header_len, length, constructed, tag_class, tag|
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asn1_body = asn1.value[1].value[header_len, length]
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end
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end
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asn1_body
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end
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cert = File.open(ARGV[0], "rb").read
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puts extension_from_cert cert, "1.3.6.1.4.1.2312.9.7"
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