Public Access
jaap-jan
b15af836a3
docs/crypto.md is now the normative, frozen specification. This had to land before anything else in M1: the server holds ciphertext and no keys, so it can never re-encrypt, and a format change after users hold data is a coordinated client rewrite with no rollback. Specification: - DSH1 envelope layout, canonical 64-byte AAD encoding, SealTo construction, key hierarchy, Argon2id profiles, fingerprints, and the change rules for each version field. - AAD encoding is fixed-width binary rather than delimited string concatenation, so no field value can forge a field boundary. This supersedes the illustrative form sketched in ADR 0001, which now points here. - UUIDs are RFC 4122 big-endian. Guid.ToByteArray() emits the first three groups little-endian and would have made our ciphertext unreadable by any other implementation of this spec, failing only at a cross-implementation boundary. Verified rather than assumed: - PrimitiveAvailabilityTests proves X25519, Ed25519, XChaCha20-Poly1305, Argon2id and HKDF-SHA512 all function on net10.0. NSec 26.4.0 targets net9.0 and is consumed by forward compatibility; this closes one of the two package questions the plan flagged. - Argon2Profile exists because NSec's MemorySize is in KIBIBYTES, not bytes. Passing bytes gives either a 256 GiB allocation or a 256 KiB KDF that cracks instantly. The type takes mebibytes so the unit cannot be got wrong at a call site. Found by benchmarking: the first measurements were ~1000x too slow, which turned out to be 19 GiB of work. - Parameters measured, not guessed: 256 MiB/t=4 is 323 ms on this machine; the table of candidates is in the spec. Implementation and tests (83 total, up from 17): - AadDescriptor, DshEnvelope, DshCrypto (Seal/Open/SealTo/OpenSealed/fingerprints). - Decryption returns null rather than throwing: ciphertext comes from a server that is explicitly not trusted, so a failed tag is an expected outcome. - Envelope readers reject unknown algorithms and any non-zero flag bit, so an envelope that is not fully understood fails closed. - Executable form of the spec's substitution claims: a server cannot move ciphertext between resources, roll back a key generation or item version, repurpose a payload as metadata, or confuse the two constructions. - Golden vectors in tests/fixtures/crypto/vectors.json guard the format. Mutation-checked: a one-byte schema version change trips four tests including the guard. Two build-infrastructure bugs found and fixed along the way: - .editorconfig forced camelCase on const and static readonly fields. PascalCase is the .NET convention for both; the config was wrong, not the code. - The golden fixture was resolved with [CallerFilePath], which ContinuousIntegrationBuild rewrites to /_/... under deterministic source paths. It passed locally and would have failed only in CI. Now copied to the output directory and read from there.
70 lines
3.2 KiB
XML
70 lines
3.2 KiB
XML
<Project>
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<PropertyGroup>
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<ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
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<CentralPackageTransitivePinningEnabled>true</CentralPackageTransitivePinningEnabled>
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</PropertyGroup>
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<!--
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Versions are pinned here for the whole solution. Packages are added per milestone
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rather than all at once, so that every entry is one we have actually verified and
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restored. See docs/adr/ for the choices behind the notable ones.
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-->
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<ItemGroup Label="ASP.NET Core">
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<PackageVersion Include="Microsoft.AspNetCore.OpenApi" Version="10.0.10" />
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</ItemGroup>
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<ItemGroup Label="Pinned transitive dependencies">
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<!--
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Microsoft.AspNetCore.OpenApi 10.0.10 resolves Microsoft.OpenApi 2.0.0, which is
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covered by GHSA-v5pm-xwqc-g5wc (high: circular schema references can terminate
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OpenAPI parsing; vulnerable <= 2.7.4, patched in 2.7.5). Pinned forward within the
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2.x major that ASP.NET Core 10 targets. Revisit when the ASP.NET Core package
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itself moves off 2.0.0.
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-->
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<PackageVersion Include="Microsoft.OpenApi" Version="2.11.0" />
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</ItemGroup>
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<ItemGroup Label="Cryptography">
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<!--
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NSec wraps libsodium. Chosen over the BCL because .NET has no X25519 or Ed25519, and
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because ChaCha20Poly1305.IsSupported is false on macOS, which rules out the in-box
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AEAD for a cross-platform client. NSec also holds key material in libsodium's
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guarded, non-swappable memory, which a byte[] cannot do. See docs/crypto.md.
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26.4.0 targets net9.0; net10.0 consumes it by forward compatibility. Native binaries
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arrive via the libsodium package, pinned here because central transitive pinning
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requires it to be declared.
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-->
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<PackageVersion Include="NSec.Cryptography" Version="26.4.0" />
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<PackageVersion Include="libsodium" Version="1.0.22" />
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<!-- Managed differential oracle for the crypto test suite only. -->
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<PackageVersion Include="BouncyCastle.Cryptography" Version="2.6.2" />
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</ItemGroup>
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<ItemGroup Label="Analyzers">
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<PackageVersion Include="Microsoft.CodeAnalysis.BannedApiAnalyzers" Version="5.6.0" />
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<PackageVersion Include="Microsoft.CodeAnalysis.PublicApiAnalyzers" Version="5.6.0" />
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<PackageVersion Include="Meziantou.Analyzer" Version="3.0.134" />
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</ItemGroup>
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<ItemGroup Label="Testing">
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<!--
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xunit.v3 runs on Microsoft.Testing.Platform, not VSTest. Microsoft.NET.Test.Sdk and
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coverlet.collector are VSTest components: referencing them alongside MTP raises
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MTP0001 and their collector never runs, so neither is referenced.
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No coverage collector yet. Microsoft.Testing.Extensions.CodeCoverage 18.9.0 pulls
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Microsoft.Testing.Platform.MSBuild 1.9.1, which is built against MTP 1.x and throws
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TypeLoadException on IDataConsumer against the MTP 2.3.x that xunit.v3 3.2.2 brings.
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Coverage gates are an M3 concern (90% on Domain and Authorization); pick a version
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aligned with MTP 2.x then rather than carrying a broken dependency until it matters.
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-->
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<PackageVersion Include="xunit.v3" Version="3.2.2" />
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<PackageVersion Include="Shouldly" Version="4.3.0" />
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<PackageVersion Include="NSubstitute" Version="6.0.0" />
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</ItemGroup>
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</Project>
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