Struct fedimint_threshold_crypto::PublicKeySet
source · pub struct PublicKeySet { /* private fields */ }
Expand description
A public key and an associated set of public key shares.
Implementations§
source§impl PublicKeySet
impl PublicKeySet
sourcepub fn coefficients(&self) -> Iter<'_, G1Projective>
pub fn coefficients(&self) -> Iter<'_, G1Projective>
Returns the coefficients representing the pk shares of the set
sourcepub fn threshold(&self) -> usize
pub fn threshold(&self) -> usize
Returns the threshold t
: any set of t + 1
signature shares can be combined into a full
signature.
sourcepub fn public_key(&self) -> PublicKey
pub fn public_key(&self) -> PublicKey
Returns the public key.
Returns the i
-th public key share.
sourcepub fn combine_signatures<'a, T, I>(&self, shares: I) -> Result<Signature>where
I: IntoIterator<Item = (T, &'a SignatureShare)>,
T: IntoScalar,
pub fn combine_signatures<'a, T, I>(&self, shares: I) -> Result<Signature>where I: IntoIterator<Item = (T, &'a SignatureShare)>, T: IntoScalar,
Combines the shares into a signature that can be verified with the main public key.
The validity of the shares is not checked: If one of them is invalid, the resulting signature also is. Only returns an error if there is a duplicate index or too few shares.
Validity of signature shares should be checked beforehand, or validity of the result afterwards:
let sk_set = SecretKeySet::random(3, &mut rand::thread_rng());
let sk_shares: Vec<_> = (0..6).map(|i| sk_set.secret_key_share(i)).collect();
let pk_set = sk_set.public_keys();
let msg = "Happy birthday! If this is signed, at least four people remembered!";
// Create four signature shares for the message.
let sig_shares: BTreeMap<_, _> = (0..4).map(|i| (i, sk_shares[i].sign(msg))).collect();
// Validate the signature shares.
for (i, sig_share) in &sig_shares {
assert!(pk_set.public_key_share(*i).verify(sig_share, msg));
}
// Combine them to produce the main signature.
let sig = pk_set.combine_signatures(&sig_shares).expect("not enough shares");
// Validate the main signature. If the shares were valid, this can't fail.
assert!(pk_set.public_key().verify(&sig, msg));
sourcepub fn decrypt<'a, T, I>(&self, shares: I, ct: &Ciphertext) -> Result<Vec<u8>>where
I: IntoIterator<Item = (T, &'a DecryptionShare)>,
T: IntoScalar,
pub fn decrypt<'a, T, I>(&self, shares: I, ct: &Ciphertext) -> Result<Vec<u8>>where I: IntoIterator<Item = (T, &'a DecryptionShare)>, T: IntoScalar,
Combines the shares to decrypt the ciphertext.
Trait Implementations§
source§impl Clone for PublicKeySet
impl Clone for PublicKeySet
source§fn clone(&self) -> PublicKeySet
fn clone(&self) -> PublicKeySet
Returns a copy of the value. Read more
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from
source
. Read moresource§impl Debug for PublicKeySet
impl Debug for PublicKeySet
source§impl<'de> Deserialize<'de> for PublicKeySet
impl<'de> Deserialize<'de> for PublicKeySet
source§fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>where
__D: Deserializer<'de>,
fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>where __D: Deserializer<'de>,
Deserialize this value from the given Serde deserializer. Read more
source§impl From<Commitment> for PublicKeySet
impl From<Commitment> for PublicKeySet
source§fn from(commit: Commitment) -> PublicKeySet
fn from(commit: Commitment) -> PublicKeySet
Converts to this type from the input type.
source§impl Hash for PublicKeySet
impl Hash for PublicKeySet
source§impl Ord for PublicKeySet
impl Ord for PublicKeySet
source§fn cmp(&self, other: &PublicKeySet) -> Ordering
fn cmp(&self, other: &PublicKeySet) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere Self: Sized,
Compares and returns the maximum of two values. Read more
source§impl PartialEq<PublicKeySet> for PublicKeySet
impl PartialEq<PublicKeySet> for PublicKeySet
source§fn eq(&self, other: &PublicKeySet) -> bool
fn eq(&self, other: &PublicKeySet) -> bool
This method tests for
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd<PublicKeySet> for PublicKeySet
impl PartialOrd<PublicKeySet> for PublicKeySet
source§fn partial_cmp(&self, other: &PublicKeySet) -> Option<Ordering>
fn partial_cmp(&self, other: &PublicKeySet) -> Option<Ordering>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
This method tests less than or equal to (for
self
and other
) and is used by the <=
operator. Read moresource§impl Serialize for PublicKeySet
impl Serialize for PublicKeySet
impl Eq for PublicKeySet
impl StructuralEq for PublicKeySet
impl StructuralPartialEq for PublicKeySet
Auto Trait Implementations§
impl RefUnwindSafe for PublicKeySet
impl Send for PublicKeySet
impl Sync for PublicKeySet
impl Unpin for PublicKeySet
impl UnwindSafe for PublicKeySet
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