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zk-token-sdk: implement convert traits for elgamal ciphertexts and ristretto points (#25549)

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samkim-crypto 2022-05-26 05:46:29 +09:00 committed by GitHub
parent cafa85bfbb
commit d33cb2fa54
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1 changed files with 40 additions and 4 deletions
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44
zk-token-sdk/src/zk_token_elgamal/convert.rs
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@ -1,15 +1,51 @@
use super::pod;
pub use target_arch::*;
use {super::pod, crate::curve25519::ristretto::PodRistrettoPoint};
impl From<(pod::PedersenCommitment, pod::DecryptHandle)> for pod::ElGamalCiphertext {
fn from((comm, decrypt_handle): (pod::PedersenCommitment, pod::DecryptHandle)) -> Self {
fn from((commitment, handle): (pod::PedersenCommitment, pod::DecryptHandle)) -> Self {
let mut buf = [0_u8; 64];
buf[..32].copy_from_slice(&comm.0);
buf[32..].copy_from_slice(&decrypt_handle.0);
buf[..32].copy_from_slice(&commitment.0);
buf[32..].copy_from_slice(&handle.0);
pod::ElGamalCiphertext(buf)
}
}
impl From<pod::ElGamalCiphertext> for (pod::PedersenCommitment, pod::DecryptHandle) {
fn from(ciphertext: pod::ElGamalCiphertext) -> Self {
let commitment: [u8; 32] = ciphertext.0[..32].try_into().unwrap();
let handle: [u8; 32] = ciphertext.0[32..].try_into().unwrap();
(
pod::PedersenCommitment(commitment),
pod::DecryptHandle(handle),
)
}
}
impl From<pod::PedersenCommitment> for PodRistrettoPoint {
fn from(commitment: pod::PedersenCommitment) -> Self {
PodRistrettoPoint(commitment.0)
}
}
impl From<PodRistrettoPoint> for pod::PedersenCommitment {
fn from(point: PodRistrettoPoint) -> Self {
pod::PedersenCommitment(point.0)
}
}
impl From<pod::DecryptHandle> for PodRistrettoPoint {
fn from(handle: pod::DecryptHandle) -> Self {
PodRistrettoPoint(handle.0)
}
}
impl From<PodRistrettoPoint> for pod::DecryptHandle {
fn from(point: PodRistrettoPoint) -> Self {
pod::DecryptHandle(point.0)
}
}
#[cfg(not(target_os = "solana"))]
mod target_arch {
use {