25 lines
1,011 B
Ruby
25 lines
1,011 B
Ruby
class ASN1::Timestamp
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## Poor man’s rfc3161 timestamp decoding
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# This works, as of 2019-05, for timestamps delivered by the universign POST api.
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# We should properly access the ASN1 contents using the sequence and tags structure.
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# However:
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# * It’s hard to do right.
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# * We currently don’t require it for proper operation; timestamps are never exposed to users.
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# * There’s an ongoing PR https://github.com/ruby/openssl/pull/204 for proper timestamp decoding in the ruby openssl library; let’s use OpenSSL::TS once it exists.
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def self.timestampInfo(asn1timestamp)
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asn1 = OpenSSL::ASN1.decode(asn1timestamp)
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tstInfo = OpenSSL::ASN1.decode(asn1.value[1].value[0].value[2].value[1].value[0].value)
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tstInfo
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end
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def self.signature_time(asn1timestamp)
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tstInfo = timestampInfo(asn1timestamp)
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tstInfo.value[4].value
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end
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def self.signed_digest(asn1timestamp)
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tstInfo = timestampInfo(asn1timestamp)
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tstInfo.value[2].value[1].value.unpack1('H*')
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end
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end
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