Dangerous Things
782074f6ae
Three components, all bench-validated to varying depths: - applet/: CSA Aliro v1.0 Java Card applet for J3R180. AUTH0 + AUTH1 expedited-standard flow end-to-end green via PC/SC bench reader (aliro-bench-test). Userland AES-256-GCM and HMAC-SHA-256 layered on top of J3R180's primitives because the card lacks both natively. P-256 curve params seeded explicitly per J3R180's quirk. - harness/: Python orchestrator (aliro-trustgen, aliro-personalize, aliro-bench-test) for trust-bundle generation, card personalization via PersonalizationApplet, and PC/SC AUTH0+AUTH1 transactions. 126 pytest cases passing. - reader/STM32CubeExpansion_ALIRO_V1_0_0/: ST X-CUBE-ALIRO V1.0.0 with our NFC10A1 port (NUCLEO-U545RE-Q + X-NUCLEO-NFC10A1, ST25R200 shared with NFC09A1). nfc10-only/ project, NFC10A1 BSP shim, ALIRO_TRUST_OVERRIDE include into vendor's provisioning.c, and an ALIRO_APDU_TRACE wrapper around demoTransceiveBlocking. Boots, detects the J3R180, completes SELECT + AUTH0; AUTH1 currently fails with RFAL ERR_PROTO (0xB) — under investigation, see docs/plans/2026-04-20-nucleo-nfc10a1-port.md and bench-notes/. Excluded: x-cube-aliro.zip vendor archive, harness/.venv, build dirs, generated aliro_trust.h (contains private reader scalar), all PEMs. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
46 lines
1.4 KiB
Python
46 lines
1.4 KiB
Python
"""Tests for the Aliro `kid` header derivation per spec \u00a77.2.1.
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The spec defines:
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kid = SHA256("key-identifier" || 0x04 || IssuerKey_PubK.x || IssuerKey_PubK.y)[:8]
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where "key-identifier" is the literal ASCII string.
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"""
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import hashlib
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from cryptography.hazmat.primitives.asymmetric import ec
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from aliro_harness.issuer.kid import compute_issuer_kid
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def test_kid_is_8_bytes():
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key = ec.generate_private_key(ec.SECP256R1())
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kid = compute_issuer_kid(key.public_key())
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assert isinstance(kid, bytes)
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assert len(kid) == 8
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def test_kid_matches_spec_formula():
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"""Reference check: re-derive the kid from scratch and compare."""
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key = ec.generate_private_key(ec.SECP256R1())
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pub = key.public_key()
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numbers = pub.public_numbers()
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x_bytes = numbers.x.to_bytes(32, "big")
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y_bytes = numbers.y.to_bytes(32, "big")
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expected_input = b"key-identifier" + b"\x04" + x_bytes + y_bytes
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expected_kid = hashlib.sha256(expected_input).digest()[:8]
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assert compute_issuer_kid(pub) == expected_kid
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def test_kid_is_deterministic():
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key = ec.generate_private_key(ec.SECP256R1())
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pub = key.public_key()
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assert compute_issuer_kid(pub) == compute_issuer_kid(pub)
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def test_kid_differs_for_different_keys():
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key_a = ec.generate_private_key(ec.SECP256R1())
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key_b = ec.generate_private_key(ec.SECP256R1())
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assert compute_issuer_kid(key_a.public_key()) != compute_issuer_kid(key_b.public_key())
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