multiversx-bls for Rust

This is a wrapper library of bls, that bridges the functionality with MultiversX crypto packages.

Spec Name

multiversx-bls	Spec Name
G1	Signature
G2	Public Key

G1 - Signature

verify(&self, public_key: G2, msg: &[u8]) -> bool

• Checks if self is a valid signature of message for the given public key.

fast_aggregate_verify(&self, public_keys: &[G2], msg: &[u8]) -> bool

• Checks if self is a valid aggregated signature of message for multiple public keys.

add_assign(&mut self, signature: G1)

• Adds another signature to self (signature aggregation).

is_valid_order(&self) -> bool

• Checks if self is a valid signature of the correct group order.

aggregate(&mut self, sigs: &[G1])

• Sets self as the aggregated signature of signatures.

is_zero(&self) -> bool

• Checks if self is the point at infinity (zero element).

is_valid(&self) -> bool

• Checks if self is a valid G1 element.

verify_signature_order(verify: bool)

• Enables or disables signature order verification:
  • true: verification enabled;
  • false: verification disabled (default).

deserialize(&mut self, buf: &[u8]) -> bool

• Deserialize a signature from an array of bytes.

from_serialized(buf: &[u8]) -> Result<Self, BlsError>

• Creates a new G1 element from a serialized buffer:
  • G1 if successful;
  • Return BlsError::InvalidData on failure.

serialize(&self) -> Result<Vec<u8>, BlsError>

• Serializes the signature into a vector of bytes:
  • A vector of bytes if successful;
  • Return BlsError::SerializeError on failure.

G2 - Public Key

add_assign(&mut self, public_key: G2)

• Adds another public key to self.

is_valid_order(&self) -> bool

• Checks if self is a valid public key of the correct group order.

set_str(&mut self, s: &str)

• Sets the G2 element from a base-10 string.

deserialize_g2(&mut self, buf: &[u8]) -> bool

• Deserializes a G2 element from a byte buffer.

is_zero(&self) -> bool

• Checks if self is the point at infinity (zero element).

is_valid(&self) -> bool

• Checks if self is a valid G2 element.

verify_public_key_order(verify: bool)

• Enables/disables verification of public key order when setting keys:
  • true: verification enabled;
  • false: verification disabled (default).

serialize(&self) -> Result<Vec<u8>, BlsError>

• Serializes the public key into a byte array.
  • A vector of bytes if successful;
  • Return BlsError::SerializeError on failure.

deserialize(&mut self, buf: &[u8]) -> bool

• Deserializes a public key from a byte array.

from_serialized(buf: &[u8]) -> Result<Self, BlsError>

• Creates a new G2 element from a serialized buffer:
  • Returns G2 if successful;
  • Returns BlsError::InvalidData otherwise.

Secret Key

set_by_csprng(&mut self)

• Initializes the secret key using a cryptographically secure random number generator (CSPRNG). Panics if the generated key is zero.

set_hex_str(&mut self, s: &str) -> bool

• Sets the secret key from a hexadecimal string.

from_hex_str(s: &str) -> Result<SecretKey, BlsError>

• Creates a new secret key from a hexadecimal string:
  • Returns SecretKey if valid;
  • Returns BlsError::InvalidData if invalid.

get_public_key(&self) -> G2

• Derives the public key (G2) corresponding to this secret key.

sign(&self, msg: &[u8]) -> G1

• Generates a signature (G1) of the given message.

deserialize(&mut self, buf: &[u8]) -> bool

• Deserializes a secret key from a byte array. Returns true if successful and length matches.

from_serialized(buf: &[u8]) -> Result<Self, BlsError>

• Creates a new secret key from serialized data:
  • Returns SecretKey if valid;
  • Returns BlsError::InvalidData if invalid.

serialize(&self) -> Result<Vec<u8>, BlsError>

• Serializes the secret key into a byte array:
  • A vector of bytes if successful;
  • Return BlsError::SerializeError on failure.

Executors

• Executors are extracted from bls-go-binary, version v1.28.2.

Usage

Example: creating a public key from a vector of bytes.

let buffer = [0; 96];

let mut public_key = G2::default();

if !public_key.deserialize_g2(buffer) {
    return Err(BlsError::InvalidData);
}

Example: creating a signature from a vector of bytes.

let buffer = [0; 48];

let mut sign = G1::default();

if !sign.deserialize(buffer) {
    return Err(BlsError::InvalidData);
}

Example: verifying a BLS signature with a single public key and message.

fn verify_signature(signature: G1, public_key: G2, message: &[u8]) {
    signature.verify(public_key, message)
}