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zeekay
d2b5812200
Defines the policy that constrains which cryptographic operations a
Quasar node accepts. The package contains no cryptographic primitives.
Two values, one gate:
Profile immutable 8-byte canonical encoding; SHA3-256
hash is published in block headers.
Refuse(ctx, Op) reports whether op is admissible under the
profile bound to ctx.
Policy and enforcement are decomplected. Each constrained operation
(ECDSA precompile, pairing precompile, classical SNARK verifier)
calls Refuse once at its entry point and otherwise proceeds in its
own lane. The profile does not know how the operations compute; the
operations do not know how the profile is selected.
Presets:
Strict forbids every classical category — mainnet.
Permissive admits every operation — testnet, default for
unbound contexts.
Categories (Forbid* flags map 1:1):
CatECDSAContractAuth ECDSARecover, ECDSAVerify, Schnorr
CatClassicalSig Ed25519, X25519
CatPairingPrecompile BN254Pairing, BLS12381Pair, BLSSignature
CatKZGPrecompile KZGEval
CatClassicalSNARK Groth16, Plonk, Marlin
CatNonSHA3Hash SHA256, RIPEMD160, Blake2b, Blake2s, Keccak256
Strict profile hash (pinned in profile_test.go):
9d70a692103d09414ffb2577ca53852c99b2d13b987c49f20852899f9a0be348
Permissive profile hash:
cf7b7f49edcad4722838277dd310dcf6a61d0552ce0f2116ad39c3dcd23bd916
A change to either hash is a consensus-breaking change and requires a
canonical-encoding version bump.
Environment override: QUASAR_STRICT_PQ=1 selects Strict via
ProfileFromEnv. Mainnet binaries set it in their entrypoint.
31 unit tests; vet-clean.
34 lines
1013 B
Go
34 lines
1013 B
Go
package annulus
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import "context"
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// ctxKey is unexported so external packages cannot collide on it.
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type ctxKey struct{}
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// WithProfile returns a child context that carries p as its active
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// profile. Subsequent calls to [Refuse] and [FromContext] on the
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// returned context observe p.
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func WithProfile(parent context.Context, p Profile) context.Context {
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if parent == nil {
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parent = context.Background()
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}
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return context.WithValue(parent, ctxKey{}, p)
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}
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// FromContext returns the profile bound to ctx. When no profile is
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// bound, it returns [Permissive] — the failure-open default for code
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// paths that have not yet been audited for strict enforcement.
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//
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// Mainnet binaries bind a profile at startup so this default is never
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// observed in production; in development and tests the default keeps
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// the gate transparent.
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func FromContext(ctx context.Context) Profile {
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if ctx == nil {
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return Permissive()
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}
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if v, ok := ctx.Value(ctxKey{}).(Profile); ok {
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return v
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}
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return Permissive()
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}
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