Struct secp256k1::Message

pub struct Message(_);

A (hashed) message input to an ECDSA signature.

Implementations

impl Message

pub fn as_ptr(&self) -> *const u8

Converts the object to a raw pointer for FFI interfacing

pub fn as_mut_ptr(&mut self) -> *mut u8

Converts the object to a mutable raw pointer for FFI interfacing

pub fn len(&self) -> usize

Returns the length of the object as an array

pub fn is_empty(&self) -> bool

Returns whether the object as an array is empty

impl Message

pub fn from_slice(data: &[u8]) -> Result<Message, Error>

If you just want to sign an arbitrary message use Message::from_hashed_data instead.

Converts a MESSAGE_SIZE-byte slice to a message object. WARNING: the slice has to be a cryptographically secure hash of the actual message that’s going to be signed. Otherwise the result of signing isn’t a secure signature.

pub fn from_hashed_data<H: ThirtyTwoByteHash + Hash>(data: &[u8]) -> Self

Available on crate feature bitcoin_hashes only.

Constructs a Message by hashing data with hash algorithm H. This requires the feature bitcoin_hashes to be enabled.

extern crate bitcoin_hashes;
use secp256k1::Message;
use bitcoin_hashes::sha256;
use bitcoin_hashes::Hash;

let m1 = Message::from_hashed_data::<sha256::Hash>("Hello world!".as_bytes());
// is equivalent to
let m2 = Message::from(sha256::Hash::hash("Hello world!".as_bytes()));

assert_eq!(m1, m2);

Trait Implementations

impl AsRef<[u8; 32]> for Message

fn as_ref(&self) -> &[u8; 32]

Gets a reference to the underlying array

impl CPtr for Message

type Target = u8

fn as_c_ptr(&self) -> *const Self::Target

fn as_mut_c_ptr(&mut self) -> *mut Self::Target

impl Clone for Message

fn clone(&self) -> Message

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Message

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

Formats the value using the given formatter.

impl Display for Message

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

Formats the value using the given formatter.

impl<T: ThirtyTwoByteHash> From<T> for Message

fn from(t: T) -> Message

Converts a 32-byte hash directly to a message without error paths.

impl Hash for Message

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 Message

type Output = [u8]

The returned type after indexing.

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

Performs the indexing (container[index]) operation.

impl Index<RangeFrom<usize>> for Message

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 Message

type Output = [u8]

The returned type after indexing.

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

Performs the indexing (container[index]) operation.

impl Index<RangeTo<usize>> for Message

type Output = [u8]

The returned type after indexing.

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

Performs the indexing (container[index]) operation.

impl Index<usize> for Message

type Output = u8

The returned type after indexing.

fn index(&self, index: usize) -> &u8

Performs the indexing (container[index]) operation.

impl LowerHex for Message

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

Formats the value using the given formatter.

impl Ord for Message

fn cmp(&self, other: &Message) -> 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.

fn clamp(self, min: Self, max: Self) -> Self

Restrict a value to a certain interval.

impl PartialEq<Message> for Message

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

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

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

This method tests for !=.

impl PartialOrd<Message> for Message

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

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

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

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

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

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

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

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

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

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

impl Copy for Message

impl Eq for Message