feat(xmldsig): implement rsa-pss - #191
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Add fixed and parameterized RSA-PSS signing and verification with independent MGF hashes, exact salts, strict parameters, key restrictions and provider/policy enforcement. Preserve existing RSA arithmetic and blinding through a narrow padding adaptation. Cover all pinned donor PSS cases, reciprocal oracles, provider paths and malformed/boundary inputs; update CLI and documentation. Closes #190
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Included review availability: This review used your included allowance. Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThis change adds fixed and parameterized RSA-PSS XML signature methods. It implements parameter parsing, serialization, signing, verification, and provider support. It also updates key and policy checks, CLI compatibility behavior, capability records, documentation, and RSA-PSS test coverage. ChangesRSA-PSS XML signatures
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~60 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant SignatureMethod
participant parse_signature_method
participant RsaSigningKey
participant CryptoProvider
participant rsa_pss
SignatureMethod->>parse_signature_method: provide RSA-PSS method and parameters
parse_signature_method->>RsaSigningKey: return algorithm and parameters
RsaSigningKey->>CryptoProvider: request signature
CryptoProvider->>rsa_pss: perform RSA-PSS signing
Merge Risk: ⚪ Minimal · up to No actionable merge-blocking issue remains. The RSA-PSS policy behavior is an explicit opt-in, and the OpenSSL-dependent check is gated; the change is ready for normal merge checks. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The change expands security-sensitive signature processing, but the inspected paths preserve explicit algorithm permissions, key restrictions and provider boundaries. No concrete security bypass was established. Residual risk remains because cryptographic and deployment-specific coverage is incomplete. Retained concerns Security review detailsSecurity Blast Radius
Trust Boundaries and Controls
Resilience and Maintainability Implications
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 43.01% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 93 functions across 21 files. (3 skipped: 3 unsupported.)
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Inline comments:
Review comments at @tests/rsa_pss.rs:
- Around line 473-542: Update pss_independent_mgf_cross_verifies_with_openssl to
check that the OpenSSL binary is available before running the oracle test, and
skip with an explicit message when it is missing. Alternatively, gate the test
behind an opt-in environment variable, following the existing XMLSEC1_BIN
pattern in the test file.
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📒 Files selected for processing (62)
LICENSE-THIRD-PARTYREADME.mdcompatibility/libxmlsec1-1.3.13-rules.jsoncompatibility/libxmlsec1-1.3.13.jsondocs/crypto-providers.mddocs/rsa-pss-patch.mddocs/xmldsig.mdscripts/import-donor-fixtures.shsrc/policy.rssrc/provider.rssrc/provider/aws_lc.rssrc/provider/pkcs11.rssrc/provider/rsa_pss.rssrc/xmldsig/builder.rssrc/xmldsig/keys.rssrc/xmldsig/mod.rssrc/xmldsig/parse.rssrc/xmldsig/sign.rssrc/xmldsig/signature.rssrc/xmldsig/verify.rstests/capability_ledger.rstests/fixtures/xmldsig/aleksey-xmldsig-01/enveloped-sha224-rsa-pss-sha224.tmpltests/fixtures/xmldsig/aleksey-xmldsig-01/enveloped-sha224-rsa-pss-sha224.xmltests/fixtures/xmldsig/aleksey-xmldsig-01/enveloped-sha256-rsa-pss-sha256.tmpltests/fixtures/xmldsig/aleksey-xmldsig-01/enveloped-sha256-rsa-pss-sha256.xmltests/fixtures/xmldsig/aleksey-xmldsig-01/enveloped-sha384-rsa-pss-sha384.tmpltests/fixtures/xmldsig/aleksey-xmldsig-01/enveloped-sha384-rsa-pss-sha384.xmltests/fixtures/xmldsig/aleksey-xmldsig-01/enveloped-sha3_224-rsa-pss-sha3_224.tmpltests/fixtures/xmldsig/aleksey-xmldsig-01/enveloped-sha3_224-rsa-pss-sha3_224.xmltests/fixtures/xmldsig/aleksey-xmldsig-01/enveloped-sha3_256-rsa-pss-sha3_256.tmpltests/fixtures/xmldsig/aleksey-xmldsig-01/enveloped-sha3_256-rsa-pss-sha3_256.xmltests/fixtures/xmldsig/aleksey-xmldsig-01/enveloped-sha3_384-rsa-pss-sha3_384.tmpltests/fixtures/xmldsig/aleksey-xmldsig-01/enveloped-sha3_384-rsa-pss-sha3_384.xmltests/fixtures/xmldsig/aleksey-xmldsig-01/enveloped-sha3_512-rsa-pss-sha3_512.tmpltests/fixtures/xmldsig/aleksey-xmldsig-01/enveloped-sha3_512-rsa-pss-sha3_512.xmltests/fixtures/xmldsig/aleksey-xmldsig-01/enveloped-sha512-rsa-pss-sha512.tmpltests/fixtures/xmldsig/aleksey-xmldsig-01/enveloped-sha512-rsa-pss-sha512.xmltests/fixtures/xmldsig/aleksey-xmldsig-01/enveloping-rsa-pss-sha1.tmpltests/fixtures/xmldsig/aleksey-xmldsig-01/enveloping-rsa-pss-sha1.xmltests/fixtures/xmldsig/aleksey-xmldsig-01/enveloping-rsa-pss-sha224.tmpltests/fixtures/xmldsig/aleksey-xmldsig-01/enveloping-rsa-pss-sha224.xmltests/fixtures/xmldsig/aleksey-xmldsig-01/enveloping-rsa-pss-sha256.tmpltests/fixtures/xmldsig/aleksey-xmldsig-01/enveloping-rsa-pss-sha256.xmltests/fixtures/xmldsig/aleksey-xmldsig-01/enveloping-rsa-pss-sha384.tmpltests/fixtures/xmldsig/aleksey-xmldsig-01/enveloping-rsa-pss-sha384.xmltests/fixtures/xmldsig/aleksey-xmldsig-01/enveloping-rsa-pss-sha3_224.tmpltests/fixtures/xmldsig/aleksey-xmldsig-01/enveloping-rsa-pss-sha3_224.xmltests/fixtures/xmldsig/aleksey-xmldsig-01/enveloping-rsa-pss-sha3_256.tmpltests/fixtures/xmldsig/aleksey-xmldsig-01/enveloping-rsa-pss-sha3_256.xmltests/fixtures/xmldsig/aleksey-xmldsig-01/enveloping-rsa-pss-sha3_384.tmpltests/fixtures/xmldsig/aleksey-xmldsig-01/enveloping-rsa-pss-sha3_384.xmltests/fixtures/xmldsig/aleksey-xmldsig-01/enveloping-rsa-pss-sha3_512.tmpltests/fixtures/xmldsig/aleksey-xmldsig-01/enveloping-rsa-pss-sha3_512.xmltests/fixtures/xmldsig/aleksey-xmldsig-01/enveloping-rsa-pss-sha512.tmpltests/fixtures/xmldsig/aleksey-xmldsig-01/enveloping-rsa-pss-sha512.xmltests/fixtures_smoke.rstests/pkcs11.rstests/rsa_pss.rstools/xmlsec1/src/capabilities.rstools/xmlsec1/src/commands.rstools/xmlsec1/src/key_material.rstools/xmlsec1/tests/process_contract.rs
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Configure immutable PSS family permissions before processing XML, reject out-of-range RSA signatures, and resolve restricted PSS public keys. Preserve independent legacy trust enforcement and portable OpenSSL vector coverage with explicit live-oracle configuration.
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Summary
Validation
OPENSSL_BINenables required live reciprocal checks and is set in CI. The portable vector path was also tested with that variable unset.Closes #190
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New Features
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Documentation