Struct exonum::crypto::Hash

pub struct Hash(_);

The result of applying the SHA-256 hash function to data.

This function splits the input data into blocks and runs each block through a cycle of 64 iterations. The result of the function is a hash 256 bits or 32 bytes in length.

Examples

The example below generates the hash of the indicated data.

use exonum::crypto::{self, Hash};

let data = [1, 2, 3];
let hash_from_data = crypto::hash(&data);
let default_hash = Hash::default();

Methods

impl Hash

pub fn zero() -> Self

Creates a new instance filled with zeros.

impl Hash

pub fn new(bytes_array: [u8; 32]) -> 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 Hash

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 Hash

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

deserialize json value.

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

fn field_size() -> Offset

Field's header size.

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

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 UniqueHash for Hash

fn hash(&self) -> Self

Returns a hash of the value.

impl StorageKey for Hash

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 StorageValue for Hash

fn into_bytes(self) -> Vec<u8>

Serialize a value into a vector of bytes.

fn from_bytes(value: Cow<[u8]>) -> Self

Deserialize a value from bytes.

impl ProofMapKey for Hash

type Output = Self

The type of keys as read from the database.

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

Writes this key into a byte buffer.

fn read_key(raw: &[u8]) -> Self

Reads this key from the buffer.

impl Eq for Hash

impl PartialOrd<Hash> for Hash

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

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

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

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

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

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

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

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

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

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

impl Copy for Hash

impl Default for Hash

Returns a hash consisting of zeros.

fn default() -> Self

Returns the "default value" for a type.

impl PartialEq<Hash> for Hash

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

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

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

This method tests for !=.

impl AsRef<[u8]> for Hash

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

Performs the conversion.

impl Clone for Hash

fn clone(&self) -> Hash

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Ord for Hash

fn cmp(&self, other: &Hash) -> 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 Hash

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

Formats the value using the given formatter.

impl Display for Hash

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

Formats the value using the given formatter.

impl Hash for Hash

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 Hash

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 Hash

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 Hash

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 Hash

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 Hash

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

Deserialize this value from the given Serde deserializer.

impl Serialize for Hash

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 Hash

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.