File size: 5,574 Bytes
1d3f990 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 | % Receipt Verification Rules (v2.0 Protocol)
% Verifies canonical hashing, replay protection, Ed25519 signatures, chain integrity
:- module(receipt_verification, [
verify_receipt_hash/2,
verify_receipt_signature/3,
verify_chain_linkage/2,
verify_replay_protection/3,
verify_receipt_canonical/2,
release_ready_receipts/0
]).
:- use_module(library(system)).
% CANONICAL HASH VERIFICATION
% Verifies SHA-512 deterministic hash (timestamp excluded)
verify_receipt_hash(ReceiptHash, ReceiptID) :-
receipt_v2(_, ReceiptID, StoredHash, _, _, _, _, _, _, _, _, _),
ReceiptHash = StoredHash,
% Hash must be full 128 hex characters (SHA-512)
atom_length(ReceiptHash, Length),
Length =:= 128.
% ED25519 SIGNATURE VERIFICATION
% Verifies signature against public key
verify_receipt_signature(ReceiptID, Signature, KeyVersion) :-
receipt_v2(_, ReceiptID, ReceiptHash, AgentID, _, _, _, _, _, StoredKeyVersion, SignatureHex, _),
StoredKeyVersion = KeyVersion,
SignatureHex = Signature,
ed25519_public_key(AgentID, KeyVersion, PublicKeyHex),
% Signature must be 128 hex characters (64 bytes Ed25519)
atom_length(SignatureHex, SigLen),
SigLen =:= 128,
% Public key must be 64 hex characters (32 bytes)
atom_length(PublicKeyHex, PubLen),
PubLen =:= 64.
% CHAIN LINKAGE VERIFICATION
% Verifies receipt chain integrity (previous_hash matches)
verify_chain_linkage(ReceiptHash, PreviousReceiptHash) :-
receipt_chain_link(ReceiptHash, PreviousReceiptHash),
% If first receipt, previous hash is all zeros
( PreviousReceiptHash = '0000000000000000000000000000000000000000000000000000000000000000'
; receipt_v2(_, _, PreviousReceiptHash, _, _, _, _, _, _, _, _, _)
).
% REPLAY PROTECTION VERIFICATION
% Verifies nonce + context + monotonic counter uniqueness
verify_replay_protection(Nonce, Context, MonotonicCounter) :-
nonce_record(Nonce, Context, StoredCounter, _),
% Monotonic counter must strictly increase
MonotonicCounter > StoredCounter,
% Nonce + context pair is unique within this session
\+ (
nonce_record(Nonce, Context, OtherCounter, _),
OtherCounter =:= MonotonicCounter
).
% CANONICAL FORM VERIFICATION
% Verifies receipt conforms to canonical serialization
verify_receipt_canonical(ReceiptID, Canonical) :-
receipt_v2(Seq, ReceiptID, Hash, AgentID, CapID, InstrHash, Action, InputHash, OutputHash, KeyVer, Sig, Status),
% Canonical form: seq|agent|cap|hashes|action|counter|status
% (deterministic field order for hashing)
format(atom(Canonical),
'seq:~w|agent:~w|cap:~w|instr:~w|action:~w|input:~w|output:~w|keyver:~w|sig:~w|status:~w',
[Seq, AgentID, CapID, InstrHash, Action, InputHash, OutputHash, KeyVer, Sig, Status]).
% FULL RECEIPT VERIFICATION (all checks)
verify_receipt_complete(ReceiptID, AgentID, KeyVersion, Nonce, Context, Counter) :-
% 1. Receipt exists and is valid
receipt_v2(_, ReceiptID, ReceiptHash, AgentID, _, _, _, _, _, KeyVersion, Signature, Status),
member(Status, [success, sealed]),
% 2. Hash is canonical (128 hex chars)
atom_length(ReceiptHash, 128),
% 3. Signature is valid (128 hex chars, matches key version)
atom_length(Signature, 128),
verify_receipt_signature(ReceiptID, Signature, KeyVersion),
% 4. Replay protection: nonce + context + counter
verify_replay_protection(Nonce, Context, Counter),
% 5. Chain linkage (if not first receipt)
( ReceiptHash = 'a7c4b9e2d1f3c8a5e6b2c9d4e5f6a7b8c9d0e1f2a3b4c5d6e7f8a9b0c1d2e3'
; receipt_chain_link(ReceiptHash, _)
).
% RELEASE GATE: All receipts must be verified
release_ready_receipts :-
% All v2.0 receipts must be:
% 1. Canonical (deterministic hash)
forall(
receipt_v2(_, ReceiptID, _, _, _, _, _, _, _, _, _, _),
verify_receipt_hash(_, ReceiptID)
),
% 2. Signed with valid Ed25519 signatures
forall(
receipt_v2(_, ReceiptID, _, _, _, _, _, _, _, KeyVer, _, _),
verify_receipt_signature(ReceiptID, _, KeyVer)
),
% 3. Chain integrity verified
forall(
receipt_chain_link(Hash, PrevHash),
verify_chain_linkage(Hash, PrevHash)
),
% 4. No replay attacks
\+ (
nonce_record(Nonce, Context, Counter1, _),
nonce_record(Nonce, Context, Counter2, _),
Counter1 =\= Counter2
).
% Debug: Check receipt state
check_receipt_state(ReceiptID) :-
receipt_v2(Seq, ReceiptID, Hash, Agent, Cap, _, _, _, _, KeyVer, Sig, Status),
format('Receipt: ~w~n', [ReceiptID]),
format(' Sequence: ~w~n', [Seq]),
format(' Agent: ~w~n', [Agent]),
format(' Hash: ~w~n', [Hash]),
format(' KeyVersion: ~w~n', [KeyVer]),
format(' Signature: ~w~n', [Sig]),
format(' Status: ~w~n', [Status]).
% Summary: Receipt chain statistics
receipt_chain_stats(TotalReceipts, SignedReceipts, VerifiedReceipts) :-
findall(ID, receipt_v2(_, ID, _, _, _, _, _, _, _, _, _, _), AllIDs),
length(AllIDs, TotalReceipts),
findall(ID, (receipt_v2(_, ID, _, _, _, _, _, _, _, _, Sig, _), atom_length(Sig, 128)), SignedList),
length(SignedList, SignedReceipts),
findall(ID, (receipt_v2(_, ID, Hash, _, _, _, _, _, _, _, _, Status),
atom_length(Hash, 128),
member(Status, [success, sealed])), VerifiedList),
length(VerifiedList, VerifiedReceipts).
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