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Add VRF example backend #218

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35 changes: 35 additions & 0 deletions backend/rs/ic_vetkeys/src/utils/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -18,15 +18,29 @@ use std::array::TryFromSliceError;
use std::ops::Neg;
use zeroize::{Zeroize, ZeroizeOnDrop};

// These are the production master public keys

const MASTER_PUBLIC_KEY_BYTES_KEY_1 : [u8; 96] = hex!("a9caf9ae8af0c7c7272f8a122133e2e0c7c0899b75e502bda9e109ca8193ded3ef042ed96db1125e1bdaad77d8cc60d917e122fe2501c45b96274f43705edf0cfd455bc66c3c060faa2fcd15486e76351edf91fecb993797273bbc8beaa47404");

const MASTER_PUBLIC_KEY_BYTES_TEST_KEY_1 : [u8; 96] = hex!("ad86e8ff845912f022a0838a502d763fdea547c9948f8cb20ea7738dd52c1c38dcb4c6ca9ac29f9ac690fc5ad7681cb41922b8dffbd65d94bff141f5fb5b6624eccc03bf850f222052df888cf9b1e47203556d7522271cbb879b2ef4b8c2bfb1");

// These are the PocketIC keys

const MASTER_PUBLIC_KEY_BYTES_POCKETIC_KEY_1 : [u8; 96] = hex!("8c800b5cff00463d26e8167369168827f1e48f4d8d60f71dd6a295580f65275b5f5f8e6a792c876b2c72492136530d0710a27522ee63977a76216c3cef9e70bfcb45b88736fc62142e7e0737848ce06cbb1f45a4a6a349b142ae5cf7853561e0");

const MASTER_PUBLIC_KEY_BYTES_POCKETIC_TEST_KEY_1 : [u8; 96] = hex!("9069b82c7aae418cef27678291e7f2cb1a008a500eceba7199bffca12421b07c158987c6a22618af3d1958738b2835691028801f7663d311799733286c557c8979184bb62cb559a4d582fca7d2e48b860f08ed6641aef66a059ec891889a6218");

const MASTER_PUBLIC_KEY_BYTES_POCKETIC_DFX_TEST_KEY : [u8; 96] = hex!("b181c14cf9d04ba45d782c0067a44b0aaa9fc2acf94f1a875f0dae801af4f80339a7e6bf8b09fcf993824c8df3080b3f1409b688ca08cbd44d2cb28db9899f4aa3b5f06b9174240448e10be2f01f9f80079ea5431ce2d11d1c8d1c775333315f");

lazy_static::lazy_static! {
static ref G2PREPARED_NEG_G : G2Prepared = G2Affine::generator().neg().into();

static ref G2_KEY_1: G2Affine = G2Affine::from_compressed(&MASTER_PUBLIC_KEY_BYTES_KEY_1).expect("Hardcoded master public key not a valid point");
static ref G2_TEST_KEY_1: G2Affine = G2Affine::from_compressed(&MASTER_PUBLIC_KEY_BYTES_TEST_KEY_1).expect("Hardcoded master public key not a valid point");

static ref POCKETIC_G2_KEY_1: G2Affine = G2Affine::from_compressed(&MASTER_PUBLIC_KEY_BYTES_POCKETIC_KEY_1).expect("Hardcoded master public key not a valid point");
static ref POCKETIC_G2_TEST_KEY_1: G2Affine = G2Affine::from_compressed(&MASTER_PUBLIC_KEY_BYTES_POCKETIC_TEST_KEY_1).expect("Hardcoded master public key not a valid point");
static ref POCKETIC_G2_DFX_TEST_KEY: G2Affine = G2Affine::from_compressed(&MASTER_PUBLIC_KEY_BYTES_POCKETIC_DFX_TEST_KEY).expect("Hardcoded master public key not a valid point");
}

const G1AFFINE_BYTES: usize = 48; // Size of compressed form
Expand Down Expand Up @@ -228,6 +242,22 @@ impl MasterPublicKey {
}
}

/// Return the hardcoded master public key used on IC
///
/// This allows performing public key derivation offline
///
/// Returns None if the provided key_id is not known
pub fn for_pocketic_key(key_id: &VetKDKeyId) -> Option<Self> {
match (key_id.curve, key_id.name.as_str()) {
(VetKDCurve::Bls12_381_G2, "key_1") => Some(Self::new(*POCKETIC_G2_KEY_1)),
(VetKDCurve::Bls12_381_G2, "test_key_1") => Some(Self::new(*POCKETIC_G2_TEST_KEY_1)),
(VetKDCurve::Bls12_381_G2, "dfx_test_key") => {
Some(Self::new(*POCKETIC_G2_DFX_TEST_KEY))
}
(_, _) => None,
}
}

fn new(point: G2Affine) -> Self {
Self { point }
}
Expand Down Expand Up @@ -928,6 +958,11 @@ impl VrfOutput {
&self.dpk
}

/// Return the proof associated with this VRF output
pub fn proof(&self) -> &VetKey {
&self.proof
}

/// Return the VRF output
///
/// This is a random-looking value which was provably generated by some party with
Expand Down
8 changes: 8 additions & 0 deletions examples/verifiable_nft/README.md
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@@ -0,0 +1,8 @@
# Verifiable NFT Example

An example of generating NFTs that are verifiable: anyone can check
that a particular NFT was generated using VetKD for the seed material.

## Additional Resources

- **[What are VetKeys](https://internetcomputer.org/docs/building-apps/network-features/encryption/vetkeys)** - For more information about VetKeys and VetKD.
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