Struct MPI

pub struct MPI { /* private fields */ }

A Multiprecision Integer.

Implementations

impl MPI

pub fn new(value: &[u8]) -> Self

Creates a new MPI.

This function takes care of removing leading zeros.

pub fn new_point(x: &[u8], y: &[u8], field_bits: usize) -> Self

Creates new MPI encoding an uncompressed EC point.

Encodes the given point on a elliptic curve (see Section 6 of RFC 6637 for details). This is used to encode public keys and ciphertexts for the NIST curves (NistP256, NistP384, and NistP521).

pub fn new_compressed_point(x: &[u8]) -> Self

Creates new MPI encoding a compressed EC point using native encoding.

Encodes the given point on a elliptic curve (see Section 13.2 of RFC4880bis for details). This is used to encode public keys and ciphertexts for the Bernstein curves (currently X25519).

pub fn zero() -> Self

Creates a new MPI representing zero.

pub fn is_zero(&self) -> bool

Tests whether the MPI represents zero.

pub fn bits(&self) -> usize

Returns the length of the MPI in bits.

Leading zero-bits are not included in the returned size.

pub fn value(&self) -> &[u8]

Returns the value of this MPI.

Note that due to stripping of zero-bytes, the returned value may be shorter than expected.

pub fn value_padded(&self, to: usize) -> Result<Cow<'_, [u8]>>

Returns the value of this MPI zero-padded to the given length.

MPI-encoding strips leading zero-bytes. This function adds them back, if necessary. If the size exceeds to, an error is returned.

pub fn decode_point(&self, curve: &Curve) -> Result<(&[u8], &[u8])>

Decodes an EC point encoded as MPI.

Decodes the MPI into a point on an elliptic curve (see Section 6 of RFC 6637 and Section 13.2 of RFC4880bis for details). If the point is not compressed, the function returns (x, y). If it is compressed, y will be empty.

Errors

Returns Error::UnsupportedEllipticCurve if the curve is not supported, Error::MalformedMPI if the point is formatted incorrectly, Error::InvalidOperation if the given curve is operating on native octet strings.

Trait Implementations

impl Clone for MPI

fn clone(&self) -> MPI

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for MPI

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

Formats the value using the given formatter.

impl From<Box<[u8]>> for MPI

fn from(v: Box<[u8]>) -> Self

Converts to this type from the input type.

impl From<MPI> for ProtectedMPI

fn from(m: MPI) -> Self

Converts to this type from the input type.

impl From<Vec<u8>> for MPI

fn from(v: Vec<u8>) -> Self

Converts to this type from the input type.

impl Hash for MPI

fn hash(&self, hash: &mut dyn Digest)

Updates the given hash with this object.

impl Hash for MPI

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, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Marshal for MPI

fn serialize(&self, w: &mut dyn Write) -> Result<()>

Writes a serialized version of the object to o.

fn export(&self, o: &mut dyn Write) -> Result<()>

Exports a serialized version of the object to o.

impl MarshalInto for MPI

fn serialized_len(&self) -> usize

Computes the maximal length of the serialized representation.

fn serialize_into(&self, buf: &mut [u8]) -> Result<usize>

Serializes into the given buffer.

fn to_vec(&self) -> Result<Vec<u8>>

Serializes the packet to a vector.

fn export_into(&self, buf: &mut [u8]) -> Result<usize>

Exports into the given buffer.

fn export_to_vec(&self) -> Result<Vec<u8>>

Exports to a vector.

impl Ord for MPI

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

This method returns an Ordering between self and other.

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

where Self: Sized,

Compares and returns the maximum of two values.

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

where Self: Sized,

Compares and returns the minimum of two values.

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

where Self: Sized,

Restrict a value to a certain interval.

impl<'a> Parse<'a, MPI> for MPI

fn from_buffered_reader<R>(reader: R) -> Result<Self>

where R: BufferedReader<Cookie> + 'a,

Reads from the given buffered reader.

fn from_reader<R: 'a + Read + Send + Sync>(reader: R) -> Result<Self>

Reads from the given reader.

fn from_bytes<D: AsRef<[u8]> + ?Sized + Send + Sync>( data: &'a D, ) -> Result<Self>

Reads from the given slice.

fn from_file<P: AsRef<Path>>(path: P) -> Result<T>

Reads from the given file.

impl PartialEq for MPI

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for MPI

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

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

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

Tests less than (for self and other) and is used by the < operator.

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

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

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

Tests greater than (for self and other) and is used by the > operator.

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

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

impl Eq for MPI