UniqueSchnorrSignature

mithril_stm

Struct UniqueSchnorrSignature 

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pub struct UniqueSchnorrSignature { /* private fields */ }
Expand description

Structure of the Unique Schnorr signature to use with the SNARK

This signature includes a value commitment_point which depends only on the message and the signing key. This value is used in the lottery process to determine the correct indices.

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impl UniqueSchnorrSignature

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pub fn verify( &self, msg: &[u8], verification_key: &SchnorrVerificationKey, ) -> StmResult<()>

This function performs the verification of a Unique Schnorr signature given the signature, the signed message and a verification key derived from the signing key used to sign.

Input: - a Unique Schnorr signature - a message: some bytes - a verification key: a value depending on the signing key Output: - Ok(()) if the signature verifies and an error if not

The protocol computes: - msg_hash_point = H(Sha256(msg)) - random_point_1_recomputed = response * msg_hash_point + challenge * commitment_point - random_point_2_recomputed = response * prime_order_generator_point + challenge * verification_key - challenge_recomputed = Poseidon(DST || H(Sha256(msg)) || verification_key || commitment_point || random_point_1_recomputed || random_point_2_recomputed)

Check: challenge == challenge_recomputed

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pub fn to_bytes(self) -> [u8; 96]

Convert a UniqueSchnorrSignature into bytes.

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pub fn from_bytes(bytes: &[u8]) -> StmResult<Self>

Convert bytes into a UniqueSchnorrSignature.

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impl Clone for UniqueSchnorrSignature

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fn clone(&self) -> UniqueSchnorrSignature

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for UniqueSchnorrSignature

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<'de> Deserialize<'de> for UniqueSchnorrSignature

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fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>
where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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impl PartialEq for UniqueSchnorrSignature

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fn eq(&self, other: &UniqueSchnorrSignature) -> bool

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Serialize for UniqueSchnorrSignature

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fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>
where __S: Serializer,

Serialize this value into the given Serde serializer. Read more
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impl Copy for UniqueSchnorrSignature

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impl Eq for UniqueSchnorrSignature

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impl StructuralPartialEq for UniqueSchnorrSignature

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