SchnorrSignature

mithril_stm

Struct SchnorrSignature 

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

Structure of the Schnorr signature to use with the SNARK

This signature includes a value sigma 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 SchnorrSignature

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

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

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

The protocol computes: - msg_hash = H(Sha256(msg)) - random_point_1_recomputed = msg_hash * signature + sigma * challenge - random_point_2_recomputed = generator * signature + verification_key * challenge - challenge_recomputed = Poseidon(DST || H(Sha256(msg)) || verification_key || sigma || random_point_1_recomputed || random_point_2_recomputed)

Check: challenge == challenge_recomputed

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

Convert an SchnorrSignature into bytes.

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

Convert bytes into a SchnorrSignature.

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impl Clone for SchnorrSignature

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fn clone(&self) -> SchnorrSignature

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 SchnorrSignature

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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 PartialEq for SchnorrSignature

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fn eq(&self, other: &SchnorrSignature) -> 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 Copy for SchnorrSignature

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impl Eq for SchnorrSignature

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impl StructuralPartialEq for SchnorrSignature

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