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@ -12,6 +12,7 @@ use {
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scalar::Scalar,
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},
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ed25519_dalek::SecretKey as SigningKey,
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solana_sdk::pubkey::Pubkey,
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serde::{Deserialize, Serialize},
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std::collections::HashMap,
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std::convert::TryInto,
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@ -56,14 +57,6 @@ impl ElGamal {
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}
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}
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#[cfg(not(target_arch = "bpf"))]
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#[allow(non_snake_case)]
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pub fn from_signing_key(signing_key: &SigningKey, label: &'static [u8]) -> Self {
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let secret = ElGamalSecretKey::new(signing_key, label);
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let public = ElGamalPubkey::new(&secret);
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Self { secret, public }
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}
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/// On input a public key and a message to be encrypted, the function
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/// returns an ElGamal ciphertext of the message under the public key.
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#[cfg(not(target_arch = "bpf"))]
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@ -139,6 +132,21 @@ pub struct ElGamalKeypair {
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}
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impl ElGamalKeypair {
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/// Generates the public and secret keys for ElGamal encryption from Ed25519 signing key and an
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/// address.
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#[cfg(not(target_arch = "bpf"))]
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#[allow(non_snake_case)]
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pub fn new(signing_key: &SigningKey, address: &Pubkey) -> Self {
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let secret = ElGamalSecretKey::new(signing_key, address);
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let public = ElGamalPubkey::new(&secret);
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Self {
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secret,
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public,
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}
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}
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/// Generates the public and secret keys for ElGamal encryption.
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#[cfg(not(target_arch = "bpf"))]
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#[allow(clippy::new_ret_no_self)]
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@ -288,8 +296,10 @@ impl fmt::Display for ElGamalPubkey {
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#[zeroize(drop)]
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pub struct ElGamalSecretKey(Scalar);
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impl ElGamalSecretKey {
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pub fn new(signing_key: &SigningKey, label: &'static [u8]) -> Self {
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let hashable = [&signing_key.to_bytes(), label].concat();
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pub fn new(signing_key: &SigningKey, address: &Pubkey) -> Self {
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let mut hashable = [0_u8; 64];
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hashable[..32].copy_from_slice(&signing_key.to_bytes());
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hashable[32..].copy_from_slice(&address.to_bytes());
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ElGamalSecretKey(Scalar::hash_from_bytes::<Sha3_512>(&hashable))
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}
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