Package com.codevasp.lazysodium.interfaces

Class Ristretto255.RistrettoPoint

java.lang.Object

com.codevasp.lazysodium.interfaces.Ristretto255.RistrettoPoint

Enclosing interface:

Ristretto255

public static final class Ristretto255.RistrettoPoint
extends Object

Method Summary

Modifier and Type	Method	Description
static Ristretto255.RistrettoPoint	base(LazySodium ls)	Returns the base point of the Ristretto255 group.
String	encode()	Encodes the point using the LazySodium's associated MessageEncoder.
boolean	equals(Object o)
static Ristretto255.RistrettoPoint	fromBytes(LazySodium ls, byte[] bytes)	Creates a new Ristretto255.RistrettoPoint from the binary representation.
static Ristretto255.RistrettoPoint	fromHex(LazySodium ls, String hex)	Creates a new Ristretto255.RistrettoPoint from the hexadecimal representation.
static Ristretto255.RistrettoPoint	fromString(LazySodium ls, String encoded)	Creates a new Ristretto255.RistrettoPoint from the encoded representation, using the LazySodium's associated MessageEncoder.
int	hashCode()
static Ristretto255.RistrettoPoint	hashToPoint(LazySodium ls, byte[] input)	Maps the input to a Ristretto255.RistrettoPoint, by calculating the SHA-512 hash and mapping it to the Ristretto 255 group, using crypto_code_ristretto255_from_hash, i.e. the standard hash-to-group algorithm.
static Ristretto255.RistrettoPoint	hashToPoint(LazySodium ls, String encodedInput)	Maps the encoded input to a Ristretto255.RistrettoPoint, using the LazySodium's associated MessageEncoder.
Ristretto255.RistrettoPoint	minus(Ristretto255.RistrettoPoint other)	Subtracts the given point from this point.
Ristretto255.RistrettoPoint	negate()	Returns the additive inverse of this point.
Ristretto255.RistrettoPoint	plus(Ristretto255.RistrettoPoint other)	Adds the given point to this point.
static Ristretto255.RistrettoPoint	random(LazySodium ls)	Returns a random element of the Ristretto255 group.
Ristretto255.RistrettoPoint	scalarMult(BigInteger n)	Multiplies this point by a given scalar.
Ristretto255.RistrettoPoint	times(BigInteger n)	Multiplies this point by a given scalar.
byte[]	toBytes()	Returns this point's canonical encoding.
String	toHex()	Returns the hexadecimal notation of this point's canonical encoding.
String	toString()
static Ristretto255.RistrettoPoint	zero(LazySodium ls)	Returns the zero element (identity element) of the Ristretto255 group.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Method Details

zero

public static Ristretto255.RistrettoPoint zero(LazySodium ls)

Returns the zero element (identity element) of the Ristretto255 group.

Parameters:

ls - the LazySodium instance

Returns:

the identity element of Ristretto255

random

public static Ristretto255.RistrettoPoint random(LazySodium ls)

Returns a random element of the Ristretto255 group.

Parameters:

ls - the LazySodium instance

Returns:

a random element of Ristretto255

base

public static Ristretto255.RistrettoPoint base(LazySodium ls)
                                        throws SodiumException

Returns the base point of the Ristretto255 group.

Parameters:

ls - the LazySodium instance

Returns:

the base point of Ristretto255

Throws:

SodiumException

fromHex

public static Ristretto255.RistrettoPoint fromHex(LazySodium ls,
 String hex)

Creates a new Ristretto255.RistrettoPoint from the hexadecimal representation. The hexadecimal representation must be a valid canonical encoding.

Parameters:

ls - the LazySodium instance

hex - the Ristretto255 canonical encoding in hexadecimal notation

Returns:

the corresponding Ristretto255.RistrettoPoint

fromString

public static Ristretto255.RistrettoPoint fromString(LazySodium ls,
 String encoded)

Creates a new Ristretto255.RistrettoPoint from the encoded representation, using the LazySodium's associated MessageEncoder. The decoded bytes must be a valid canonical encoding.

Parameters:

ls - the LazySodium instance

encoded - the encoded Ristretto255 point

Returns:

the corresponding Ristretto255.RistrettoPoint

fromBytes

public static Ristretto255.RistrettoPoint fromBytes(LazySodium ls,
 byte[] bytes)

Creates a new Ristretto255.RistrettoPoint from the binary representation. The binary representation must be a valid canonical encoding.

Parameters:

ls - the LazySodium instance

bytes - the Ristretto255 canonical encoding

Returns:

the corresponding Ristretto255.RistrettoPoint

hashToPoint

public static Ristretto255.RistrettoPoint hashToPoint(LazySodium ls,
 String encodedInput)
                                               throws SodiumException

Maps the encoded input to a Ristretto255.RistrettoPoint, using the LazySodium's associated MessageEncoder. The resulting bytes are hashed using SHA-512 and mapped to the Ristretto 255 group, using crypto_code_ristretto255_from_hash, i.e. the standard hash-to-group algorithm.

Parameters:

ls - the LazySodium instance

encodedInput - the encoded bytes

Returns:

the mapped Ristretto255.RistrettoPoint

Throws:

SodiumException - if the mapping failed

hashToPoint

public static Ristretto255.RistrettoPoint hashToPoint(LazySodium ls,
 byte[] input)
                                               throws SodiumException

Maps the input to a Ristretto255.RistrettoPoint, by calculating the SHA-512 hash and mapping it to the Ristretto 255 group, using crypto_code_ristretto255_from_hash, i.e. the standard hash-to-group algorithm.

Parameters:

ls - the LazySodium instance

input - the input bytes

Returns:

the mapped Ristretto255.RistrettoPoint

Throws:

SodiumException - if the mapping failed

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toHex

public String toHex()

Returns the hexadecimal notation of this point's canonical encoding.

Returns:

the point in hexadecimal notation

toBytes

public byte[] toBytes()

Returns this point's canonical encoding.

Returns:

the point

encode

public String encode()

Encodes the point using the LazySodium's associated MessageEncoder.

Returns:

the encoded point

scalarMult

public Ristretto255.RistrettoPoint scalarMult(BigInteger n)
                                       throws SodiumException

Multiplies this point by a given scalar.

Parameters:

n - the scalar to multiply by

Returns:

the multiplied point

Throws:

SodiumException - if the result is zero

times

public Ristretto255.RistrettoPoint times(BigInteger n)
                                  throws SodiumException

Multiplies this point by a given scalar.

Parameters:

n - the scalar to multiply by

Returns:

the multiplied point

Throws:

SodiumException - if the result is zero

plus

public Ristretto255.RistrettoPoint plus(Ristretto255.RistrettoPoint other)
                                 throws SodiumException

Adds the given point to this point. Addition is commutative.

Parameters:

other - the point to add

Returns:

the sum of both points

Throws:

SodiumException - when the operation failed

minus

public Ristretto255.RistrettoPoint minus(Ristretto255.RistrettoPoint other)
                                  throws SodiumException

Subtracts the given point from this point.

Parameters:

other - the point to subtract

Returns:

the difference of both points.

Throws:

SodiumException - when the operation failed

negate

public Ristretto255.RistrettoPoint negate()
                                   throws SodiumException

Returns the additive inverse of this point. This is equivalent to 0 - p where 0 denotes the additive identity.

Returns:

the additive inverse

Throws:

SodiumException - when the operation failed.