feat: implement fragmented zkpassport age verification

[x-senpai-x]

Implements fragmented zkPassport age verification system with two different circuit chains based on TBS certificate size.

[Copilot]

Pull request overview

Implements a fragmented zkPassport age verification flow that supports two circuit chains depending on TBS certificate size (single-pass signature verification for smaller TBS, and split SHA-256 + signature verification for larger TBS).

Changes:

• Introduces SaltedValue<T> and new shared types/constants to support salted commitments and typed byte buffers.
• Adds a new partial_sha256 library and new “fragmented_age_check” workspace with 4-circuit and 5-circuit pipelines.
• Updates RSA signature utilities (PSS salt length parameter + pre-hashed RSA verification helper) and refactors commitments to include expiry date.

Reviewed changes

Copilot reviewed 57 out of 57 changed files in this pull request and generated 5 comments.

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File	Description
noir-examples/noir-passport-examples/zkpassport_libs/utils/src/types.nr	Adds new common types (dates, digests, buffers) and SaltedValue<T> with Poseidon2 hashing helpers.
noir-examples/noir-passport-examples/zkpassport_libs/utils/src/lib.nr	Adds little-endian byte packing and MRZ expiry-date extraction helpers.
noir-examples/noir-passport-examples/zkpassport_libs/utils/src/constants.nr	Introduces shared constants (DG1 lengths, nullifier type tags).
noir-examples/noir-passport-examples/zkpassport_libs/utils/Nargo.toml	Adds Poseidon dependency for the new salted hashing utilities.
noir-examples/noir-passport-examples/zkpassport_libs/sig-check/rsa/src/lib.nr	Adds PSS salt length parameter and a helper for verifying RSA signatures from a precomputed hash.
noir-examples/noir-passport-examples/zkpassport_libs/sig-check/rsa/Nargo.toml	Switches RSA dependency from local path to a pinned git tag.
noir-examples/noir-passport-examples/zkpassport_libs/partial-sha256/src/lib.nr	New partial SHA-256 implementation for splitting hashing across circuits + Poseidon state/data commitments.
noir-examples/noir-passport-examples/zkpassport_libs/partial-sha256/Nargo.toml	New package manifest for partial_sha256.
noir-examples/noir-passport-examples/zkpassport_libs/data-check/tbs-pubkey/src/lib.nr	Refactors ECDSA pubkey presence checks to search within TBS rather than requiring a provided offset.
noir-examples/noir-passport-examples/zkpassport_libs/data-check/integrity/src/lib.nr	Adds DG1 sizing helpers and SHA-256-based integrity checks used by fragmented circuits.
noir-examples/noir-passport-examples/zkpassport_libs/commitment/scoped-nullifier/src/lib.nr	Updates nullifier derivation to use salted commitments + adds nullifier “type” output.
noir-examples/noir-passport-examples/zkpassport_libs/commitment/integrity-to-disclosure/src/lib.nr	Updates commitment chaining to include salted expiry date and salted DG1/private-nullifier hashes.
noir-examples/noir-passport-examples/zkpassport_libs/commitment/common/src/lib.nr	Updates shared commitment primitives to use salted values and optionally salt scoped nullifiers.
noir-examples/noir-passport-examples/passport_validity_check/src/lib.nr	Updates calls to RSA verification to pass the new pss_salt_len argument.
noir-examples/noir-passport-examples/noir_rsa/src/types.nr	Removes local noir_rsa types module (migrating to external dependency).
noir-examples/noir-passport-examples/noir_rsa/src/lib.nr	Removes local noir_rsa library module.
noir-examples/noir-passport-examples/noir_rsa/README.md	Removes local noir_rsa readme.
noir-examples/noir-passport-examples/noir_rsa/Nargo.toml	Removes local noir_rsa package manifest.
noir-examples/noir-passport-examples/noir_native_sha256/src/tests.nr	Removes old native SHA-256 test harness.
noir-examples/noir-passport-examples/noir_native_sha256/src/ryan_sha256_noir.nr	Removes old SHA-256 implementation file.
noir-examples/noir-passport-examples/noir_native_sha256/src/ryan_sha256_constants.nr	Removes old SHA-256 constants file.
noir-examples/noir-passport-examples/noir_native_sha256/src/ryan_sha256_compression.nr	Removes old SHA-256 compression implementation file.
noir-examples/noir-passport-examples/noir_native_sha256/src/lib.nr	Removes old noir_native_sha256 library root.
noir-examples/noir-passport-examples/noir_native_sha256/Prover.toml	Removes old prover input fixture.
noir-examples/noir-passport-examples/noir_native_sha256/Nargo.toml	Removes old noir_native_sha256 package manifest.
noir-examples/noir-passport-examples/fragmented_age_check/sig_check_id_data_720/src/main.nr	New circuit: verifies DSC signature over signed attributes (720-byte TBS path) and commits to ID data.
noir-examples/noir-passport-examples/fragmented_age_check/sig_check_id_data_720/Nargo.toml	Package manifest for sig_check_id_data_720.
noir-examples/noir-passport-examples/fragmented_age_check/sig_check_id_data_1300/src/main.nr	New circuit: verifies DSC signature over signed attributes (1300-byte TBS path) and commits to ID data.
noir-examples/noir-passport-examples/fragmented_age_check/sig_check_id_data_1300/Nargo.toml	Package manifest for sig_check_id_data_1300.
noir-examples/noir-passport-examples/fragmented_age_check/sig_check_dsc_720/src/main.nr	New circuit: verifies CSCA signature over DSC certificate for small TBS path.
noir-examples/noir-passport-examples/fragmented_age_check/sig_check_dsc_720/Nargo.toml	Package manifest for sig_check_dsc_720.
noir-examples/noir-passport-examples/fragmented_age_check/sig_check_dsc_1300_verify/src/main.nr	New circuit: completes SHA-256 over large TBS and verifies CSCA RSA signature with pre-hashed verification.
noir-examples/noir-passport-examples/fragmented_age_check/sig_check_dsc_1300_verify/Nargo.toml	Package manifest for sig_check_dsc_1300_verify.
noir-examples/noir-passport-examples/fragmented_age_check/sig_check_dsc_1300_hash/src/main.nr	New circuit: processes first chunk of large TBS with SHA-256 start and commits to state+data.
noir-examples/noir-passport-examples/fragmented_age_check/sig_check_dsc_1300_hash/Nargo.toml	Package manifest for sig_check_dsc_1300_hash.
noir-examples/noir-passport-examples/fragmented_age_check/scripts/case2/prove-circuits.sh	Adds automation script to prove the 5-circuit chain.
noir-examples/noir-passport-examples/fragmented_age_check/scripts/case2/prepare-circuits.sh	Adds automation script to prepare keys for the 5-circuit chain.
noir-examples/noir-passport-examples/fragmented_age_check/scripts/case2/compile-circuits.sh	Adds automation script to compile circuits for the 5-circuit chain.
noir-examples/noir-passport-examples/fragmented_age_check/scripts/case1/prove-circuits.sh	Adds automation script to prove the 4-circuit chain.
noir-examples/noir-passport-examples/fragmented_age_check/scripts/case1/prepare-circuits.sh	Adds automation script to prepare keys for the 4-circuit chain.
noir-examples/noir-passport-examples/fragmented_age_check/scripts/case1/compile-circuits.sh	Adds automation script to compile circuits for the 4-circuit chain.
noir-examples/noir-passport-examples/fragmented_age_check/data_check_integrity_sa/src/main.nr	New circuit: checks DG1↔eContent↔SignedAttributes integrity and commits to disclosure inputs.
noir-examples/noir-passport-examples/fragmented_age_check/data_check_integrity_sa/Nargo.toml	Package manifest for data_check_integrity_sa.
noir-examples/noir-passport-examples/fragmented_age_check/compare_age/src/main.nr	New circuit: checks expiry, compares age bounds, and produces scoped nullifier + parameter commitment.
noir-examples/noir-passport-examples/fragmented_age_check/compare_age/Nargo.toml	Package manifest for compare_age circuit package.
noir-examples/noir-passport-examples/fragmented_age_check/benchmark-inputs/case2/sig_check_id_data_1300_prover.toml	Adds benchmark/prover inputs for case2 ID-data circuit.
noir-examples/noir-passport-examples/fragmented_age_check/benchmark-inputs/case2/sig_check_dsc_1300_verify_prover.toml	Adds benchmark/prover inputs for case2 DSC verification circuit.
noir-examples/noir-passport-examples/fragmented_age_check/benchmark-inputs/case2/sig_check_dsc_1300_hash_prover.toml	Adds benchmark/prover inputs for case2 DSC hash circuit.
noir-examples/noir-passport-examples/fragmented_age_check/benchmark-inputs/case2/data_check_integrity_sa_prover.toml	Adds benchmark/prover inputs for case2 integrity circuit.
noir-examples/noir-passport-examples/fragmented_age_check/benchmark-inputs/case2/compare_age_prover.toml	Adds benchmark/prover inputs for case2 compare-age circuit.
noir-examples/noir-passport-examples/fragmented_age_check/benchmark-inputs/case1/sig_check_id_data_720_prover.toml	Adds benchmark/prover inputs for case1 ID-data circuit.
noir-examples/noir-passport-examples/fragmented_age_check/benchmark-inputs/case1/sig_check_dsc_720_prover.toml	Adds benchmark/prover inputs for case1 DSC verification circuit.
noir-examples/noir-passport-examples/fragmented_age_check/benchmark-inputs/case1/data_check_integrity_sa_prover.toml	Adds benchmark/prover inputs for case1 integrity circuit.
noir-examples/noir-passport-examples/fragmented_age_check/benchmark-inputs/case1/compare_age_prover.toml	Adds benchmark/prover inputs for case1 compare-age circuit.
noir-examples/noir-passport-examples/fragmented_age_check/README.md	Documents the two circuit-chain approaches and when to use each.
noir-examples/noir-passport-examples/fragmented_age_check/Nargo.toml	Adds a workspace manifest for the fragmented age-check circuits.

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[Copilot]

Pull request overview

Copilot reviewed 58 out of 58 changed files in this pull request and generated 4 comments.

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[Bisht13]

Is the lib borrowed from ZK Passport? Also can we have tests for this lib?

[x-senpai-x]

No this was implemented by me, I tested it locally comparing it with actual sha, and it worked perfectly, I'll add some tests as well.

[Bisht13]

Can we put this outside zkpassport_libs folder?

[x-senpai-x]

Should I place it as a top-level package under noir-examples/ folder ? That way it would be reusable outside of noir-passport-examples as well.

[Bisht13]

Yes, that works.