Struct exonum::crypto::Signature

pub struct Signature(_);

Ed25519 digital signature. This structure creates a signature over data using a secret key. Later it is possible to verify, using the corresponding public key, that the data have indeed been signed with that secret key.

Ed25519 is a signature system that ensures fast signing and key generation, as well as security and collision resilience.

Examples

The example below generates a pair of random public and secret keys, adds certain data, signs the data using the secret key and verifies that the data have been signed with that secret key.

use exonum::crypto;

let (public_key, secret_key) = crypto::gen_keypair();
let data = [1, 2, 3];
let signature = crypto::sign(&data, &secret_key);
assert!(crypto::verify(&signature, &data, &public_key));

Methods

impl Signature

pub fn zero() -> Self

Creates a new instance filled with zeros.

impl Signature

pub fn new(bytes_array: [u8; 64]) -> Self

Creates a new instance from bytes array.

pub fn from_slice(bytes_slice: &[u8]) -> Option<Self>

Creates a new instance from bytes slice.

pub fn to_hex(&self) -> String

Returns a hex representation of binary data. Lower case letters are used (e.g. f9b4ca).

Trait Implementations

impl<'a> ExonumJson for &'a Signature

fn deserialize_field<B: WriteBufferWrapper>(     value: &Value,     buffer: &mut B,     from: Offset,     to: Offset ) -> Result<(), Box<dyn Error>>

write deserialized field in buffer on place.

fn serialize_field(&self) -> Result<Value, Box<dyn Error + Send + Sync>>

serialize field as json::Value

impl ExonumJsonDeserialize for Signature

fn deserialize(value: &Value) -> Result<Self, Box<dyn Error>>

deserialize json value.

impl<'a> Field<'a> for &'a Signature

fn field_size() -> Offset

Field's header size.

unsafe fn read(buffer: &'a [u8], from: Offset, _: Offset) -> &'a Signature

Read Field from buffer, with given position, beware of memory unsafety, you should check Field before read.

fn write(&self, buffer: &mut Vec<u8>, from: Offset, to: Offset)

Write Field to buffer, in given position write doesn't lead to memory unsafety.

fn check(     buffer: &'a [u8],     from: CheckedOffset,     to: CheckedOffset,     latest_segment: CheckedOffset ) -> Result

Checks if data in the buffer could be deserialized. Returns an index of latest data seen. Default implementation simply checks that the length of segment equals field size.

impl StorageKey for Signature

fn size(&self) -> usize

Returns the size of the serialized key in bytes.

fn write(&self, buffer: &mut [u8])

Serializes the key into the specified buffer of bytes.

fn read(buffer: &[u8]) -> Self

Deserializes the key from the specified buffer of bytes.

impl Eq for Signature

impl PartialOrd<Signature> for Signature

fn partial_cmp(&self, other: &Signature) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Signature) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Signature) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Signature) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Signature) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for Signature

impl PartialEq<Signature> for Signature

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

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Signature) -> bool

This method tests for !=.

impl AsRef<[u8]> for Signature

fn as_ref(&self) -> &[u8]

Performs the conversion.

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 Ord for Signature

fn cmp(&self, other: &Signature) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

impl Debug for Signature

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

Formats the value using the given formatter.

impl Display for Signature

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

Formats the value using the given formatter.

impl Hash for Signature

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given [Hasher].

fn hash_slice<H>(data: &[Self], state: &mut H) where     H: Hasher,

Feeds a slice of this type into the given [Hasher].

impl Index<Range<usize>> for Signature

type Output = [u8]

The returned type after indexing.

fn index(&self, _index: Range<usize>) -> &[u8]

Performs the indexing (container[index]) operation.

impl Index<RangeTo<usize>> for Signature

type Output = [u8]

The returned type after indexing.

fn index(&self, _index: RangeTo<usize>) -> &[u8]

Performs the indexing (container[index]) operation.

impl Index<RangeFrom<usize>> for Signature

type Output = [u8]

The returned type after indexing.

fn index(&self, _index: RangeFrom<usize>) -> &[u8]

Performs the indexing (container[index]) operation.

impl Index<RangeFull> for Signature

type Output = [u8]

The returned type after indexing.

fn index(&self, _index: RangeFull) -> &[u8]

Performs the indexing (container[index]) operation.

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, ser: S) -> Result<S::Ok, S::Error> where     S: Serializer,

Serialize this value into the given Serde serializer.

impl FromHex for Signature

type Error = FromHexError

fn from_hex<T: AsRef<[u8]>>(v: T) -> Result<Self, Self::Error>

Creates an instance of type Self from the given hex string, or fails with a custom error type.