Struct ps_sig::signature::Signature

pub struct Signature {
    pub sigma_1: SignatureGroup,
    pub sigma_2: SignatureGroup,
}

Created by the signer when no blinded messages. Also the receiver of a blind signature can get this by unblinding the blind signature.

Fields

sigma_1: SignatureGroup

sigma_2: SignatureGroup

Methods

impl Signature

pub fn new(
    messages: &[FieldElement],
    sigkey: &Sigkey,
    params: &Params
) -> Result<Self, PSError>

Create a new signature. The signature generation involves generating a random value for sigma_1 so different calls to this method with same messages, signing key and params will give different value

pub fn new_deterministic(
    messages: &[FieldElement],
    sigkey: &Sigkey
) -> Result<Self, PSError>

Create a new signature. The signature generation doesn't involve generating a random value but the messages are hashed to get a pseudorandom value for sigma_1. Hence different calls to this method with same messages and signing key will give same value

pub fn sign_with_sigma_1_generated_from_given_exp(
    messages: &[FieldElement],
    sigkey: &Sigkey,
    u: &FieldElement,
    offset: usize,
    g: &SignatureGroup
) -> Result<(SignatureGroup, SignatureGroup), PSError>

Generate signature when first element of signature tuple is generated using given exponent Does only 1 scalar multiplication

pub fn sign_with_given_sigma_1(
    messages: &[FieldElement],
    sigkey: &Sigkey,
    offset: usize,
    h: &SignatureGroup
) -> Result<SignatureGroup, PSError>

Generate signature when first element of signature tuple is given

pub fn verify(
    &self,
    messages: Vec<FieldElement>,
    vk: &Verkey,
    params: &Params
) -> Result<bool, PSError>

Verify a signature. Can verify unblinded sig received from a signer and the aggregate sig as well.

pub fn to_bytes(&self) -> Vec<u8>

Byte representation of the signature

pub fn check_verkey_and_messages_compat(
    messages: &[FieldElement],
    verkey: &Verkey
) -> Result<(), PSError>

pub fn check_sigkey_and_messages_compat(
    messages: &[FieldElement],
    sigkey: &Sigkey
) -> Result<(), PSError>

pub fn is_identity(&self) -> bool

Checks if a signature has identity elements. A valid signature should not have identity elements.

Trait Implementations

impl Clone for Signature

fn clone(&self) -> Signature

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Signature

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Signature

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

Deserialize this value from the given Serde deserializer.

impl Serialize for Signature

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

Serialize this value into the given Serde serializer.