mirror of https://github.com/zcash/orchard.git
issuer keys implementation (#5)
Implements the issuer keys as IssuerAuthorizingKey -> isk IssuerVerifyingKey -> ik Test vectors generated with zcash_test_vectors repo
This commit is contained in:
parent
33a205b94c
commit
71565ee933
111
src/keys.rs
111
src/keys.rs
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@ -18,7 +18,7 @@ use zcash_note_encryption::EphemeralKeyBytes;
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use crate::{
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address::Address,
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primitives::redpallas::{self, SpendAuth},
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primitives::redpallas::{self, SpendAuth, VerificationKey},
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spec::{
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commit_ivk, diversify_hash, extract_p, ka_orchard, prf_nf, to_base, to_scalar,
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NonIdentityPallasPoint, NonZeroPallasBase, NonZeroPallasScalar, PrfExpand,
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@ -188,19 +188,102 @@ impl SpendValidatingKey {
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pub(crate) fn from_bytes(bytes: &[u8]) -> Option<Self> {
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<[u8; 32]>::try_from(bytes)
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.ok()
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.and_then(|b| {
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// Structural validity checks for ak_P:
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// - The point must not be the identity
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// (which for Pallas is canonically encoded as all-zeroes).
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// - The sign of the y-coordinate must be positive.
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if b != [0; 32] && b[31] & 0x80 == 0 {
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<redpallas::VerificationKey<SpendAuth>>::try_from(b).ok()
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.and_then(check_structural_validity)
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.map(SpendValidatingKey)
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}
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}
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/// An issuer authorizing key, used to create issuer authorization signatures.
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/// This type enforces that the corresponding public point (ik^ℙ) has ỹ = 0.
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///
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/// $\mathsf{isk}$ as defined in
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/// [Zcash Protocol Spec § 4.2.3: Orchard Key Components][orchardkeycomponents].
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///
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/// [orchardkeycomponents]: https://zips.z.cash/protocol/nu5.pdf#orchardkeycomponents
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#[derive(Clone, Debug)]
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pub struct IssuerAuthorizingKey(redpallas::SigningKey<SpendAuth>);
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impl IssuerAuthorizingKey {
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/// Derives isk from sk. Internal use only, does not enforce all constraints.
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fn derive_inner(sk: &SpendingKey) -> pallas::Scalar {
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to_scalar(PrfExpand::ZsaIsk.expand(&sk.0))
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}
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}
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impl From<&SpendingKey> for IssuerAuthorizingKey {
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fn from(sk: &SpendingKey) -> Self {
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let isk = Self::derive_inner(sk);
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// IssuerSigningKey cannot be constructed such that this assertion would fail.
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assert!(!bool::from(isk.is_zero()));
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let ret = IssuerAuthorizingKey(isk.to_repr().try_into().unwrap());
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// If the last bit of repr_P(ik) is 1, negate isk.
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if (<[u8; 32]>::from(IssuerValidatingKey::from(&ret).0)[31] >> 7) == 1 {
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IssuerAuthorizingKey((-isk).to_repr().try_into().unwrap())
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} else {
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ret
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}
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}
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}
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/// A key used to validate issuer authorization signatures.
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///
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/// Defined in [Zcash Protocol Spec § 4.2.3: Orchard Key Components][orchardkeycomponents].
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/// Note that this is $\mathsf{ik}^\mathbb{P}$, which by construction is equivalent to
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/// $\mathsf{ik}$ but stored here as a RedPallas verification key.
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///
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/// [orchardkeycomponents]: https://zips.z.cash/protocol/nu5.pdf#orchardkeycomponents
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#[derive(Debug, Clone, PartialOrd, Ord)]
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pub struct IssuerValidatingKey(redpallas::VerificationKey<SpendAuth>);
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impl From<&IssuerAuthorizingKey> for IssuerValidatingKey {
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fn from(isk: &IssuerAuthorizingKey) -> Self {
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IssuerValidatingKey((&isk.0).into())
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}
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}
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impl From<&IssuerValidatingKey> for pallas::Point {
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fn from(issuer_validating_key: &IssuerValidatingKey) -> pallas::Point {
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pallas::Point::from_bytes(&(&issuer_validating_key.0).into()).unwrap()
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}
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}
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impl PartialEq for IssuerValidatingKey {
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fn eq(&self, other: &Self) -> bool {
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<[u8; 32]>::from(&self.0).eq(&<[u8; 32]>::from(&other.0))
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}
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}
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impl Eq for IssuerValidatingKey {}
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impl IssuerValidatingKey {
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/// Converts this spend validating key to its serialized form,
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/// I2LEOSP_256(ik).
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pub(crate) fn to_bytes(&self) -> [u8; 32] {
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// This is correct because the wrapped point must have ỹ = 0, and
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// so the point repr is the same as I2LEOSP of its x-coordinate.
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<[u8; 32]>::from(&self.0)
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}
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pub(crate) fn from_bytes(bytes: &[u8]) -> Option<Self> {
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<[u8; 32]>::try_from(bytes)
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.ok()
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.and_then(check_structural_validity)
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.map(IssuerValidatingKey)
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}
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}
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/// A function to check structural validity of the validating keys for authorizing transfers and
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/// issuing assets
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/// Structural validity checks for ik_P:
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/// - The point must not be the identity (which for Pallas is canonically encoded as all-zeroes).
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/// - The sign of the y-coordinate must be positive.
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fn check_structural_validity(
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verification_key_bytes: [u8; 32],
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) -> Option<VerificationKey<SpendAuth>> {
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if verification_key_bytes != [0; 32] && verification_key_bytes[31] & 0x80 == 0 {
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<redpallas::VerificationKey<SpendAuth>>::try_from(verification_key_bytes).ok()
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} else {
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None
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}
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})
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.map(SpendValidatingKey)
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}
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}
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/// A key used to derive [`Nullifier`]s from [`Note`]s.
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@ -1021,9 +1104,15 @@ mod tests {
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let ask: SpendAuthorizingKey = (&sk).into();
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assert_eq!(<[u8; 32]>::from(&ask.0), tv.ask);
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let isk: IssuerAuthorizingKey = (&sk).into();
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assert_eq!(<[u8; 32]>::from(&isk.0), tv.isk);
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let ak: SpendValidatingKey = (&ask).into();
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assert_eq!(<[u8; 32]>::from(ak.0), tv.ak);
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let ik: IssuerValidatingKey = (&isk).into();
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assert_eq!(<[u8; 32]>::from(ik.0), tv.ik);
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let nk: NullifierDerivingKey = (&sk).into();
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assert_eq!(nk.0.to_repr(), tv.nk);
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@ -10,6 +10,7 @@ pub(crate) enum PrfExpand {
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OrchardNk,
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OrchardRivk,
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Psi,
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ZsaIsk,
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OrchardZip32Child,
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OrchardDkOvk,
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OrchardRivkInternal,
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@ -24,6 +25,7 @@ impl PrfExpand {
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Self::OrchardNk => 0x07,
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Self::OrchardRivk => 0x08,
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Self::Psi => 0x09,
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Self::ZsaIsk => 0x0a,
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Self::OrchardZip32Child => 0x81,
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Self::OrchardDkOvk => 0x82,
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Self::OrchardRivkInternal => 0x83,
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@ -4,6 +4,8 @@ pub(crate) struct TestVector {
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pub(crate) sk: [u8; 32],
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pub(crate) ask: [u8; 32],
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pub(crate) ak: [u8; 32],
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pub(crate) isk: [u8; 32],
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pub(crate) ik: [u8; 32],
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pub(crate) nk: [u8; 32],
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pub(crate) rivk: [u8; 32],
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pub(crate) ivk: [u8; 32],
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@ -41,6 +43,16 @@ pub(crate) fn test_vectors() -> Vec<TestVector> {
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0x12, 0x8b, 0x9a, 0x14, 0x0d, 0x5e, 0x07, 0xc1, 0x51, 0x72, 0x1d, 0xc1, 0x6d, 0x25,
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0xd4, 0xe2, 0x0f, 0x15,
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],
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isk: [
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0x95, 0x4a, 0x86, 0xc7, 0xa7, 0x15, 0x53, 0xfa, 0x6c, 0x8b, 0x67, 0x58, 0x54, 0x26,
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0x8e, 0xa5, 0x4c, 0x51, 0xfb, 0x17, 0xd8, 0x3d, 0x80, 0xee, 0x71, 0xd4, 0xae, 0x42,
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0xa1, 0xf8, 0xc8, 0x16,
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],
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ik: [
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0x2e, 0x4f, 0xd4, 0xa6, 0xec, 0x39, 0x94, 0x87, 0xd3, 0x78, 0xb4, 0xc7, 0x25, 0xfb,
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0x9b, 0xaf, 0xbc, 0x01, 0xa5, 0xe2, 0xb7, 0xf3, 0x68, 0x2e, 0xf4, 0x53, 0x95, 0x91,
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0xbc, 0xf0, 0x59, 0x02,
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],
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nk: [
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0x9f, 0x2f, 0x82, 0x67, 0x38, 0x94, 0x5a, 0xd0, 0x1f, 0x47, 0xf7, 0x0d, 0xb0, 0xc3,
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0x67, 0xc2, 0x46, 0xc2, 0x0c, 0x61, 0xff, 0x55, 0x83, 0x94, 0x8c, 0x39, 0xde, 0xa9,
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0x2a, 0xd6, 0x43, 0x23, 0x62, 0x9c, 0xfe, 0xd1, 0xe3, 0xaa, 0x24, 0xef, 0x05, 0x2f,
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0x56, 0xe4, 0x00, 0x2a,
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],
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isk: [
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0xee, 0xf5, 0xe9, 0x1b, 0x36, 0xb8, 0x06, 0x86, 0x72, 0x3d, 0x14, 0xdc, 0xc7, 0x04,
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0xad, 0x59, 0x67, 0x08, 0x0b, 0x7d, 0x6e, 0x49, 0xaf, 0x97, 0x03, 0x0e, 0x4f, 0xa0,
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0xbf, 0x5a, 0xd9, 0x0b,
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],
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ik: [
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0x2e, 0xde, 0xfb, 0x15, 0x8e, 0xa4, 0x48, 0x82, 0x57, 0x2b, 0xcd, 0xb2, 0x35, 0xca,
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0x36, 0xab, 0x39, 0xc7, 0x47, 0xbb, 0x71, 0xfe, 0x0f, 0x10, 0xfa, 0xa3, 0x9b, 0xfd,
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0x62, 0x0a, 0xcc, 0x04,
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],
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nk: [
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0xa8, 0xb7, 0x3d, 0x97, 0x9b, 0x6e, 0xaa, 0xda, 0x89, 0x24, 0xbc, 0xbd, 0xc6, 0x3a,
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0x9e, 0xf4, 0xe8, 0x73, 0x46, 0xf2, 0x30, 0xab, 0xa6, 0xbb, 0xe1, 0xe2, 0xb4, 0x3c,
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0xed, 0xb4, 0x26, 0x65, 0x7b, 0x2d, 0x07, 0x40, 0x66, 0x64, 0xd8, 0x95, 0x31, 0x2e,
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0xa1, 0xc3, 0xb3, 0x34,
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],
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isk: [
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0x5b, 0x1f, 0xc4, 0x57, 0xae, 0x71, 0x38, 0x3c, 0x53, 0xf4, 0x69, 0x41, 0xb7, 0xcb,
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0x4c, 0xec, 0x3d, 0xea, 0xc0, 0xc6, 0x03, 0xe2, 0xcd, 0xd0, 0xd1, 0x8d, 0x94, 0x01,
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0x9e, 0x43, 0xe2, 0x07,
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],
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ik: [
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0x4f, 0x43, 0xeb, 0x7d, 0x9e, 0x03, 0x6f, 0xa6, 0x15, 0xfd, 0x04, 0xa5, 0xef, 0x6a,
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0xeb, 0x21, 0x6e, 0x06, 0x9b, 0xe9, 0x2d, 0x30, 0xe8, 0xf7, 0x16, 0x3e, 0xe3, 0x15,
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0x11, 0x6f, 0x18, 0x32,
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],
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nk: [
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0x04, 0x51, 0x4e, 0xa0, 0x48, 0xb9, 0x43, 0x63, 0xde, 0xa7, 0xcb, 0x3b, 0xe8, 0xd6,
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0x25, 0x82, 0xac, 0x52, 0x92, 0x2e, 0x08, 0x65, 0xf6, 0x62, 0x74, 0x3b, 0x05, 0xea,
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@ -314,6 +346,16 @@ pub(crate) fn test_vectors() -> Vec<TestVector> {
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0xe7, 0x2c, 0x3b, 0x64, 0x00, 0x06, 0xff, 0x08, 0x50, 0x52, 0x80, 0xe4, 0xf0, 0x0f,
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0xad, 0xf7, 0x63, 0x28,
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],
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isk: [
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0x71, 0xd0, 0x64, 0xaa, 0xa0, 0x82, 0x63, 0xb8, 0xe4, 0xc3, 0xed, 0x70, 0x3c, 0x6f,
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0x54, 0x25, 0x4a, 0x88, 0x8c, 0x36, 0xec, 0x69, 0x86, 0x62, 0xf7, 0x1f, 0xbb, 0xf4,
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0x26, 0xd9, 0x09, 0x28,
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],
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ik: [
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0x12, 0xb3, 0xab, 0xff, 0x96, 0x75, 0x20, 0x9e, 0x94, 0x54, 0x07, 0x0c, 0x14, 0xac,
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0x15, 0x54, 0x65, 0xae, 0x83, 0xbe, 0x2c, 0x39, 0x46, 0x63, 0x5e, 0x38, 0x77, 0xba,
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0x67, 0xdf, 0x49, 0x12,
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],
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nk: [
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0xcf, 0x36, 0xad, 0x6a, 0x06, 0x6c, 0xd2, 0x13, 0xe1, 0xd7, 0x67, 0xab, 0x07, 0x1d,
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0xc1, 0x16, 0x78, 0x85, 0xc4, 0x16, 0x8b, 0xc2, 0xe2, 0x17, 0x54, 0x48, 0x56, 0x3a,
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@ -405,6 +447,16 @@ pub(crate) fn test_vectors() -> Vec<TestVector> {
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0xf5, 0x6d, 0x83, 0x20, 0x09, 0xf7, 0x24, 0x2e, 0x1f, 0x7c, 0x77, 0x0a, 0x12, 0x24,
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0x1d, 0xfa, 0x28, 0x07,
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],
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isk: [
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0x44, 0x36, 0x1a, 0x7b, 0xa6, 0xa1, 0xaa, 0x17, 0x8e, 0x72, 0xaf, 0x47, 0xbd, 0xc1,
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0x60, 0x40, 0xce, 0x1c, 0x54, 0xdd, 0x4b, 0x56, 0x33, 0x21, 0x55, 0xba, 0x9d, 0x04,
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0x09, 0x71, 0xd0, 0x07,
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],
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ik: [
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0x1f, 0x17, 0x2d, 0x79, 0xae, 0xdc, 0xc2, 0x06, 0x8c, 0x3a, 0x09, 0x08, 0x93, 0xe1,
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0xa1, 0x75, 0xd9, 0xb5, 0x78, 0xf8, 0x91, 0xaf, 0x9a, 0xb6, 0x8d, 0x4f, 0xe1, 0xe9,
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0x05, 0xa3, 0xb2, 0x11,
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],
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nk: [
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0x51, 0xba, 0xf3, 0x33, 0xcf, 0xf1, 0xf2, 0xd0, 0xc7, 0xe3, 0xcf, 0xf4, 0xd3, 0x01,
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0x29, 0x9d, 0xc1, 0xef, 0xe9, 0x83, 0x00, 0x31, 0x4a, 0x54, 0x19, 0x38, 0x02, 0x9b,
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@ -496,6 +548,16 @@ pub(crate) fn test_vectors() -> Vec<TestVector> {
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0xdf, 0x28, 0xbb, 0x0f, 0x10, 0x21, 0xea, 0x84, 0x3f, 0x86, 0x7f, 0x8a, 0x17, 0x0f,
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0x5c, 0x33, 0x90, 0x1f,
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],
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isk: [
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0xdc, 0x93, 0x72, 0x9f, 0x3f, 0x28, 0x30, 0xed, 0x79, 0x1c, 0x21, 0xbe, 0xbe, 0x45,
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0x0f, 0xcf, 0x1f, 0x8f, 0xef, 0x49, 0x81, 0x39, 0xc7, 0x99, 0xd1, 0x63, 0x66, 0x5a,
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0x8c, 0x51, 0xe5, 0x2d,
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],
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ik: [
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0x1d, 0xb6, 0x1c, 0x29, 0x3e, 0x3a, 0x93, 0x34, 0x5d, 0x06, 0xb9, 0x0b, 0xd7, 0x1f,
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0xd3, 0x21, 0x5c, 0x2c, 0x1c, 0x29, 0x53, 0x5a, 0x10, 0xde, 0x9d, 0x31, 0x40, 0xb7,
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0x4d, 0xb6, 0x1d, 0x07,
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],
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nk: [
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0x9e, 0x99, 0x7d, 0x9d, 0x26, 0x97, 0x87, 0x26, 0x8e, 0x09, 0x2a, 0x7c, 0x85, 0x41,
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0x7d, 0xa5, 0x30, 0xea, 0x42, 0xfa, 0xc6, 0x68, 0xa7, 0x49, 0xaf, 0x55, 0xdf, 0xb7,
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@ -587,6 +649,16 @@ pub(crate) fn test_vectors() -> Vec<TestVector> {
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0x65, 0x43, 0x46, 0x2a, 0x13, 0x7f, 0xfe, 0xa3, 0x7b, 0xaf, 0x41, 0xef, 0x28, 0x6b,
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0xb7, 0x32, 0xbe, 0x2c,
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],
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isk: [
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0xf2, 0x34, 0x52, 0x32, 0xc9, 0x19, 0xc1, 0x29, 0xe0, 0x4b, 0x0c, 0x46, 0xac, 0x2c,
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0xa8, 0x50, 0x65, 0xd9, 0x54, 0x85, 0xb9, 0x02, 0xab, 0x0f, 0x98, 0xf9, 0x3a, 0xee,
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0x59, 0x4b, 0x5f, 0x02,
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],
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ik: [
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0x2c, 0x83, 0xd9, 0x20, 0xe9, 0xf6, 0x6d, 0xa5, 0x04, 0x86, 0x37, 0xad, 0x9a, 0xa2,
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0xcc, 0xe6, 0xe1, 0x6e, 0xf4, 0x8f, 0x86, 0x50, 0xea, 0x00, 0xd8, 0xc2, 0xd7, 0x68,
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0x61, 0x8a, 0xe3, 0x36,
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],
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nk: [
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0xfd, 0x31, 0x64, 0xc6, 0x32, 0xbe, 0xc9, 0x4c, 0xe9, 0xfb, 0x2f, 0x30, 0x22, 0x63,
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0xb8, 0x84, 0xab, 0xb9, 0xc1, 0x0e, 0x55, 0xe4, 0x48, 0x64, 0x7f, 0x67, 0x98, 0x49,
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@ -678,6 +750,16 @@ pub(crate) fn test_vectors() -> Vec<TestVector> {
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0xb3, 0x65, 0x1f, 0xfa, 0x1c, 0x69, 0x69, 0x15, 0xac, 0x00, 0xa2, 0x5e, 0xa3, 0xac,
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0x7d, 0xff, 0x99, 0x01,
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],
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isk: [
|
||||
0x3d, 0xa9, 0x08, 0x88, 0xba, 0x18, 0x24, 0xc8, 0x16, 0x29, 0x2d, 0x7f, 0x17, 0x33,
|
||||
0xac, 0x4c, 0xbe, 0x72, 0x2c, 0x6a, 0x12, 0x1c, 0xc7, 0x80, 0x17, 0x06, 0x26, 0xb7,
|
||||
0x0a, 0x26, 0x95, 0x28,
|
||||
],
|
||||
ik: [
|
||||
0x16, 0xa8, 0xff, 0x29, 0xb5, 0x17, 0xb5, 0xa8, 0xf7, 0xd0, 0x9b, 0x4e, 0x5e, 0x71,
|
||||
0x3a, 0x9a, 0x78, 0x4c, 0x74, 0x04, 0xd6, 0x1e, 0x3a, 0xf5, 0x30, 0x19, 0xc3, 0x47,
|
||||
0x0e, 0x90, 0x95, 0x22,
|
||||
],
|
||||
nk: [
|
||||
0x02, 0xab, 0x99, 0x5c, 0xe9, 0x8f, 0x63, 0x02, 0x5f, 0xb6, 0x24, 0x28, 0xa0, 0xfb,
|
||||
0xf5, 0x2f, 0x25, 0x22, 0xe6, 0xa2, 0x72, 0x61, 0x07, 0x8a, 0x9f, 0x4d, 0x6a, 0x36,
|
||||
|
@ -769,6 +851,16 @@ pub(crate) fn test_vectors() -> Vec<TestVector> {
|
|||
0x3b, 0x02, 0xd2, 0x5c, 0xc1, 0x0c, 0x90, 0x71, 0xfc, 0x02, 0x19, 0xe9, 0x7f, 0x93,
|
||||
0x92, 0xd0, 0x67, 0x0c,
|
||||
],
|
||||
isk: [
|
||||
0x01, 0x65, 0x33, 0x68, 0x4f, 0xb9, 0x81, 0x15, 0xa4, 0x05, 0xc9, 0xc7, 0xad, 0x47,
|
||||
0x72, 0x76, 0xab, 0x7c, 0x72, 0xfd, 0x67, 0x1a, 0x27, 0xe3, 0x6c, 0x0a, 0x7a, 0xbe,
|
||||
0x0a, 0x76, 0x90, 0x09,
|
||||
],
|
||||
ik: [
|
||||
0xff, 0xd7, 0x5f, 0x6f, 0x9e, 0xf4, 0x27, 0xf3, 0x26, 0xcd, 0xbf, 0x3a, 0x98, 0xbc,
|
||||
0xb5, 0x93, 0x63, 0x5a, 0x2c, 0x1a, 0xd7, 0x2b, 0x39, 0x99, 0x12, 0x61, 0xe2, 0x75,
|
||||
0xa9, 0xec, 0x6f, 0x10,
|
||||
],
|
||||
nk: [
|
||||
0x25, 0x91, 0xed, 0xf7, 0xef, 0x4c, 0xf2, 0x18, 0x4c, 0x34, 0xbe, 0x93, 0xfc, 0xf6,
|
||||
0x12, 0x91, 0x50, 0x42, 0xf1, 0x5a, 0xb5, 0x08, 0x4b, 0x14, 0xe1, 0x66, 0x79, 0x5b,
|
||||
|
@ -860,6 +952,16 @@ pub(crate) fn test_vectors() -> Vec<TestVector> {
|
|||
0x8d, 0x4b, 0x02, 0x5f, 0x8c, 0xc1, 0x60, 0xe1, 0xf4, 0xe9, 0x5f, 0x0a, 0x85, 0x3e,
|
||||
0xbc, 0x41, 0x6a, 0x2b,
|
||||
],
|
||||
isk: [
|
||||
0x76, 0x08, 0x32, 0x9d, 0xfa, 0x77, 0xc4, 0x2c, 0x4f, 0xc7, 0x6a, 0xc2, 0x95, 0x94,
|
||||
0xa2, 0x72, 0x83, 0x93, 0x4f, 0x5a, 0x93, 0x40, 0x71, 0xb9, 0xf8, 0xcd, 0x34, 0x4e,
|
||||
0x1f, 0x98, 0x45, 0x0e,
|
||||
],
|
||||
ik: [
|
||||
0x72, 0xa0, 0xac, 0x97, 0x8a, 0x2d, 0xa1, 0x61, 0xf4, 0x1f, 0x5b, 0x7a, 0x40, 0xbd,
|
||||
0x83, 0xc0, 0x58, 0x41, 0xf8, 0x1b, 0xc5, 0x11, 0x40, 0x67, 0xb8, 0x85, 0x98, 0x7f,
|
||||
0x48, 0xca, 0x52, 0x2d,
|
||||
],
|
||||
nk: [
|
||||
0x3e, 0x88, 0xf2, 0x07, 0x1f, 0xd9, 0xa2, 0xbb, 0x26, 0xcd, 0xa2, 0xea, 0x85, 0x6a,
|
||||
0xa0, 0xfb, 0x3a, 0x80, 0xa8, 0x7d, 0x2f, 0xb6, 0x13, 0x6f, 0xab, 0x85, 0xe3, 0x6c,
|
||||
|
|
Loading…
Reference in New Issue