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feat: add RFC-3161 timestamping (internal/evidence)

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HTTPTimestamper builds a Request directly from a precomputed SHA-256
digest (Request{HashAlgorithm, HashedMessage, Nonce}.Marshal(), not
CreateRequest(io.Reader) which would hash the input itself), POSTs it to
a TSA, and validates that the parsed response's hash algorithm, hashed
message and nonce actually match what was sent before accepting the
token — a response that doesn't match the request isn't a valid
timestamp for that hash, regardless of whether it parses.

Uses github.com/digitorus/timestamp for the RFC-3161/ASN.1 encoding
rather than hand-rolling it.

TSA choice (open point in CLAUDE.md): FreeTSA.org for now — free,
RFC-3161-compliant, verified end-to-end with a live smoke test, but
not eIDAS-qualified. Documented as needing an upgrade to a qualified
provider (D-Trust, Bundesdruckerei, ...) before real customer use, same
treatment as the open legal questions in rules/OPEN.md.

Tests cover request/response validation without network (hash size
guard, a fake server that parses and checks the incoming request,
non-200 and malformed-response handling) plus a real integration test
against FreeTSA gated behind DEKLARIX_TSA_INTEGRATION, mirroring the
DATABASE_URL-gated pattern in internal/store.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
noroot
2026-08-27 14:07:53 +02:00
parent d54636f57a
commit 917b51299b
5 changed files with 260 additions and 1 deletions
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4
go.sum
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@@ -12,6 +12,10 @@ github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1
github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/dhui/dktest v0.4.6 h1:+DPKyScKSEp3VLtbMDHcUq6V5Lm5zfZZVb0Sk7Ahom4=
github.com/dhui/dktest v0.4.6/go.mod h1:JHTSYDtKkvFNFHJKqCzVzqXecyv+tKt8EzceOmQOgbU=
github.com/digitorus/pkcs7 v0.0.0-20230713084857-e76b763bdc49 h1:h+XMRXf+WLY0h/3itqE8OT3TgjCMHK4nq2FNGi0au2c=
github.com/digitorus/pkcs7 v0.0.0-20230713084857-e76b763bdc49/go.mod h1:SKVExuS+vpu2l9IoOc0RwqE7NYnb0JlcFHFnEJkVDzc=
github.com/digitorus/timestamp v0.0.0-20250524132541-c45532741eea h1:ALRwvjsSP53QmnN3Bcj0NpR8SsFLnskny/EIMebAk1c=
github.com/digitorus/timestamp v0.0.0-20250524132541-c45532741eea/go.mod h1:GvWntX9qiTlOud0WkQ6ewFm0LPy5JUR1Xo0Ngbd1w6Y=
github.com/distribution/reference v0.6.0 h1:0IXCQ5g4/QMHHkarYzh5l+u8T3t73zM5QvfrDyIgxBk=
github.com/distribution/reference v0.6.0/go.mod h1:BbU0aIcezP1/5jX/8MP0YiH4SdvB5Y4f/wlDRiLyi3E=
github.com/docker/docker v28.3.3+incompatible h1:Dypm25kh4rmk49v1eiVbsAtpAsYURjYkaKubwuBdxEI=