Initial Ristretto255 API refactoring

multiplatform-crypto-libsodium-bindings/src/commonMain/kotlin/com.ionspin.kotlin.crypto/ed25519/Ed25519.kt

@@ -84,6 +84,8 @@ object Ed25519 {
 
             fun invert(scalar: Scalar): Scalar = Scalar(Ed25519LowLevel.invertScalar(scalar.encoded))
 
+            fun negate(scalar: Scalar): Scalar = Scalar(Ed25519LowLevel.negateScalar(scalar.encoded))
+
             fun reduce(scalar: Scalar): Scalar = Scalar(Ed25519LowLevel.reduceScalar(scalar.encoded))
 
             fun complement(scalar: Scalar) : Scalar = Scalar(Ed25519LowLevel.complementScalar(scalar.encoded))
@@ -137,7 +139,7 @@ object Ed25519 {
         operator fun div(y: UInt): Scalar = this / fromUInt(y)
         operator fun div(y: ULong): Scalar = this / fromULong(y)
 
-        operator fun unaryMinus(): Scalar = Scalar(Ed25519LowLevel.negateScalar(this.encoded))
+        operator fun unaryMinus(): Scalar = negate(this)
 
         operator fun times(p: Point): Point = p.times(this)
         fun times(p: Point, clamp: Boolean): Point =

multiplatform-crypto-libsodium-bindings/src/commonMain/kotlin/com.ionspin.kotlin.crypto/ristretto255/Ristretto255.kt

@@ -16,7 +16,7 @@ const val crypto_core_ristretto255_NONREDUCEDSCALARBYTES = 64
 const val crypto_scalarmult_ristretto255_BYTES = 32U
 const val crypto_scalarmult_ristretto255_SCALARBYTES = 32U
 
-expect abstract class Ristretto255LowLevel() {
+expect object Ristretto255LowLevel {
     fun isValidPoint(encoded: UByteArray): Boolean
     fun addPoints(p: UByteArray, q: UByteArray): UByteArray
     fun subtractPoints(p: UByteArray, q: UByteArray): UByteArray
@@ -34,97 +34,102 @@ expect abstract class Ristretto255LowLevel() {
     fun scalarMultiplicationBase(n: UByteArray): UByteArray
 }
 
-object Ristretto255 : Ristretto255LowLevel() {
+object Ristretto255 {
-    fun add(p: Point, q: Point): Point =
+//    fun add(p: Point, q: Point): Point =
-        Point(addPoints(p.encoded, q.encoded))
+//        Point(addPoints(p.encoded, q.encoded))
-
+//
-    fun subtract(p: Point, q: Point): Point =
+//    fun subtract(p: Point, q: Point): Point =
-        Point(subtractPoints(p.encoded, q.encoded))
+//        Point(subtractPoints(p.encoded, q.encoded))
-
+//
-    fun pointFromHash(hash: UByteArray): Point = Point(encodedPointFromHash(hash))
+//    fun pointFromHash(hash: UByteArray): Point = Point(encodedPointFromHash(hash))
-
+//
-    fun randomPoint(): Point = Point(randomEncodedPoint())
+//    fun randomPoint(): Point = Point(randomEncodedPoint())
-
+//
-    fun randomScalar(): Scalar = Scalar(randomEncodedScalar())
+//    fun randomScalar(): Scalar = Scalar(randomEncodedScalar())
-
+//
-    fun invert(scalar: Scalar): Scalar =
+//    fun invert(scalar: Scalar): Scalar =
-        Scalar(invertScalar(scalar.encoded))
+//        Scalar(invertScalar(scalar.encoded))
-
+//
-    fun negate(scalar: Scalar): Scalar =
+//    fun negate(scalar: Scalar): Scalar =
-        Scalar(negateScalar(scalar.encoded))
+//        Scalar(negateScalar(scalar.encoded))
-
+//
-    fun complement(scalar: Scalar): Scalar =
+//    fun complement(scalar: Scalar): Scalar =
-        Scalar(complementScalar(scalar.encoded))
+//        Scalar(complementScalar(scalar.encoded))
-
+//
-    fun add(x: Scalar, y: Scalar): Scalar =
+//    fun add(x: Scalar, y: Scalar): Scalar =
-        Scalar(addScalars(x.encoded, y.encoded))
+//        Scalar(addScalars(x.encoded, y.encoded))
-
+//
-    fun subtract(x: Scalar, y: Scalar): Scalar =
+//    fun subtract(x: Scalar, y: Scalar): Scalar =
-        Scalar(subtractScalars(x.encoded, y.encoded))
+//        Scalar(subtractScalars(x.encoded, y.encoded))
-
+//
-    fun multiply(x: Scalar, y: Scalar): Scalar =
+//    fun multiply(x: Scalar, y: Scalar): Scalar =
-        Scalar(multiplyScalars(x.encoded, y.encoded))
+//        Scalar(multiplyScalars(x.encoded, y.encoded))
-
+//
-    fun reduce(scalar: Scalar): Scalar =
+//    fun reduce(scalar: Scalar): Scalar =
-        Scalar(reduceScalar(scalar.encoded))
+//        Scalar(reduceScalar(scalar.encoded))
-
+//
-    fun scalarMultiplication(p: Point, n: Scalar): Point =
+//    fun scalarMultiplication(p: Point, n: Scalar): Point =
-        Point(scalarMultiplication(n.encoded, p.encoded))
+//        Point(scalarMultiplication(n.encoded, p.encoded))
-
+//
-    fun scalarMultiplicationBase(n: Scalar): Point =
+//    fun scalarMultiplicationBase(n: Scalar): Point =
-        Point(scalarMultiplicationBase(n.encoded))
+//        Point(scalarMultiplicationBase(n.encoded))
 
     data class Point(val encoded: UByteArray) {
-        operator fun plus(q: Point): Point = add(this, q)
-        operator fun minus(q: Point): Point = subtract(this, q)
 
-        operator fun times(n: Scalar): Point = scalarMultiplication(this, n)
+        companion object {
+            val IDENTITY: Point = Point(UByteArray(crypto_core_ristretto255_BYTES))
+            val BASE: Point = multiplyBase(Scalar.ONE)
+
+            fun fromHash(hash: UByteArray): Point = Point(Ristretto255LowLevel.encodedPointFromHash(hash))
+
+            fun random(): Point = Point(Ristretto255LowLevel.randomEncodedPoint())
+
+            fun multiplyBase(n: Scalar): Point = Point(Ristretto255LowLevel.scalarMultiplicationBase(n.encoded))
+
+            fun fromHex(hex: String): Point = Point(LibsodiumUtil.fromHex(hex))
+            
+            fun isValid(point: Point) : Boolean = Ristretto255LowLevel.isValidPoint(point.encoded)
+        }
+
+        operator fun plus(q: Point): Point = Point(Ristretto255LowLevel.addPoints(this.encoded, q.encoded))
+        operator fun minus(q: Point): Point = Point(Ristretto255LowLevel.subtractPoints(this.encoded, q.encoded))
+
+        operator fun times(n: Scalar): Point = Point(Ristretto255LowLevel.scalarMultiplication(n.encoded, this.encoded))
 
         fun toHex(): String = LibsodiumUtil.toHex(encoded)
 
         override fun equals(other: Any?): Boolean = (other as? Point)?.encoded?.contentEquals(encoded) == true
         override fun hashCode(): Int = encoded.contentHashCode()
 
-        companion object {
-            val IDENTITY: Point = Point(UByteArray(crypto_core_ristretto255_BYTES))
-            val BASE: Point = scalarMultiplicationBase(Scalar.ONE)
 
-            fun fromHash(hash: UByteArray): Point = pointFromHash(hash)
-
-            fun random(): Point = randomPoint()
-
-            fun multiplyBase(n: Scalar): Point = scalarMultiplicationBase(n)
-
-            fun fromHex(hex: String): Point = Point(LibsodiumUtil.fromHex(hex))
-        }
     }
 
     data class Scalar(val encoded: UByteArray) {
-        operator fun plus(y: Scalar): Scalar = add(this, y)
+        operator fun plus(y: Scalar): Scalar = Scalar(Ristretto255LowLevel.addScalars(this.encoded, y.encoded))
         operator fun plus(y: UInt): Scalar = this + fromUInt(y)
         operator fun plus(y: ULong): Scalar = this + fromULong(y)
 
-        operator fun minus(y: Scalar): Scalar = subtract(this, y)
+        operator fun minus(y: Scalar): Scalar = Scalar(Ristretto255LowLevel.subtractScalars(this.encoded, y.encoded))
         operator fun minus(y: UInt): Scalar = this - fromUInt(y)
         operator fun minus(y: ULong): Scalar = this - fromULong(y)
 
-        operator fun times(y: Scalar): Scalar = multiply(this, y)
+        operator fun times(y: Scalar): Scalar = Scalar(Ristretto255LowLevel.multiplyScalars(this.encoded, y.encoded))
         operator fun times(y: UInt): Scalar = this * fromUInt(y)
         operator fun times(y: ULong): Scalar = this * fromULong(y)
 
-        operator fun div(y: Scalar): Scalar = multiply(this, invert(y))
+        operator fun div(y: Scalar): Scalar = Scalar(Ristretto255LowLevel.multiplyScalars(this.encoded, y.invert().encoded))
         operator fun div(y: UInt): Scalar = this / fromUInt(y)
         operator fun div(y: ULong): Scalar = this / fromULong(y)
 
         operator fun unaryMinus(): Scalar = negate(this)
 
-        operator fun times(p: Point): Point = scalarMultiplication(p, this)
+        operator fun times(p: Point): Point = p.times(this)
 
         fun reduce(): Scalar = reduce(this)
         fun invert(): Scalar = invert(this)
         fun complement(): Scalar = complement(this)
 
-        fun multiplyWithBase(): Point = scalarMultiplicationBase(this)
+        fun multiplyWithBase(): Point = Point.multiplyBase(this)
 
         fun toHex(): String = LibsodiumUtil.toHex(encoded)
 
@@ -136,7 +141,19 @@ object Ristretto255 : Ristretto255LowLevel() {
             val ONE = fromUInt(1U)
             val TWO = fromUInt(2U)
 
-            fun random(): Scalar = randomScalar()
+            fun random(): Scalar = Scalar(Ristretto255LowLevel.randomEncodedScalar())
+
+            fun invert(scalar: Scalar): Scalar =
+                Scalar(Ristretto255LowLevel.invertScalar(scalar.encoded))
+
+            fun negate(scalar: Scalar): Scalar =
+                Scalar(Ristretto255LowLevel.negateScalar(scalar.encoded))
+
+            fun reduce(scalar: Scalar): Scalar =
+                Scalar(Ristretto255LowLevel.reduceScalar(scalar.encoded))
+
+            fun complement(scalar: Scalar): Scalar =
+                Scalar(Ristretto255LowLevel.complementScalar(scalar.encoded))
             
             fun fromUInt(i: UInt): Scalar = fromULong(i.toULong())
 
@@ -162,7 +179,7 @@ object Ristretto255 : Ristretto255LowLevel() {
                         LibsodiumUtil.fromHex(hex.padEnd(2 * crypto_core_ristretto255_NONREDUCEDSCALARBYTES, '0'))
                     // Scalars are encoded in little-endian order, so the end can be padded with zeroes up to the size of a
                     // non-reduced scalar. After decoding, it is reduced, to obtain a scalar in the canonical range
-                    return Scalar(reduceScalar(encoded))
+                    return Scalar(Ristretto255LowLevel.reduceScalar(encoded))
                 } else {
                     val encoded = LibsodiumUtil.fromHex(hex.padEnd(2 * crypto_core_ristretto255_SCALARBYTES, '0'))
                     // Scalars are encoded in little-endian order, so the end can be padded with zeroes up to the size of a

multiplatform-crypto-libsodium-bindings/src/commonTest/kotlin/com/ionspin/kotlin/crypto/ristretto255/Ristretto255Test.kt

@@ -96,9 +96,9 @@ class Ristretto255Test {
 
 
 
-            assertTrue { Ristretto255.isValidPoint(p.encoded) }
+            assertTrue { Ristretto255.Point.isValid(p) }
-            assertTrue { Ristretto255.isValidPoint(q.encoded) }
+            assertTrue { Ristretto255.Point.isValid(q) }
-            assertTrue { Ristretto255.isValidPoint(r.encoded) }
+            assertTrue { Ristretto255.Point.isValid(r) }
         }
     }
 
@@ -117,11 +117,11 @@ class Ristretto255Test {
     fun testIsValidPoint() = runTest {
         LibsodiumInitializer.initializeWithCallback {
             for (hexEncoded in badEncodings) {
-                assertFalse { Ristretto255.isValidPoint(LibsodiumUtil.fromHex(hexEncoded)) }
+                assertFalse { Ristretto255.Point.isValid(Ristretto255.Point.fromHex(hexEncoded)) }
             }
 
             for (hexEncoded in basePointSmallMultiples) {
-                assertTrue { Ristretto255.isValidPoint(LibsodiumUtil.fromHex(hexEncoded)) }
+                assertTrue { Ristretto255.Point.isValid(Ristretto255.Point.fromHex(hexEncoded)) }
             }
         }
     }
@@ -134,8 +134,8 @@ class Ristretto255Test {
                 val b = Ristretto255.Point.BASE
                 val n = Ristretto255.Scalar.fromUInt(i.toUInt() + 1U)
 
-                assertEquals(p, Ristretto255.scalarMultiplicationBase(n))
+                assertEquals(p, Ristretto255.Point.multiplyBase(n))
-                assertEquals(p, Ristretto255.scalarMultiplication(b, n))
+                assertEquals(p, b.times(n))
                 assertEquals(p, n.multiplyWithBase())
 
                 for (j in 0..<i) {

multiplatform-crypto-libsodium-bindings/src/jsMain/kotlin/com/ionspin/kotlin/crypto/ristretto255/Ristretto255LowLevel.kt

@@ -4,7 +4,7 @@ import com.ionspin.kotlin.crypto.getSodium
 import ext.libsodium.com.ionspin.kotlin.crypto.toUByteArray
 import ext.libsodium.com.ionspin.kotlin.crypto.toUInt8Array
 
-actual abstract class Ristretto255LowLevel actual constructor() {
+actual object Ristretto255LowLevel {
     actual fun isValidPoint(encoded: UByteArray): Boolean =
         getSodium().crypto_core_ristretto255_is_valid_point(encoded.toUInt8Array())
 

multiplatform-crypto-libsodium-bindings/src/jvmMain/kotlin/com/ionspin/kotlin/crypto/ristretto255/Ristretto255LowLevel.kt

@@ -3,7 +3,7 @@ package com.ionspin.kotlin.crypto.ristretto255
 import com.ionspin.kotlin.crypto.GeneralLibsodiumException.Companion.ensureLibsodiumSuccess
 import com.ionspin.kotlin.crypto.LibsodiumInitializer.sodiumJna
 
-actual abstract class Ristretto255LowLevel actual constructor() {
+actual object Ristretto255LowLevel {
     actual fun isValidPoint(encoded: UByteArray): Boolean =
         sodiumJna.crypto_core_ristretto255_is_valid_point(encoded.asByteArray()) == 1
 

multiplatform-crypto-libsodium-bindings/src/nativeMain/kotlin/com/ionspin/kotlin/crypto/ristretto255/Ristretto255LowLevel.kt

@@ -20,7 +20,7 @@ import libsodium.crypto_scalarmult_ristretto255
 import libsodium.crypto_scalarmult_ristretto255_base
 
 
-actual abstract class Ristretto255LowLevel actual constructor() {
+actual object Ristretto255LowLevel {
     actual fun isValidPoint(encoded: UByteArray): Boolean {
         return encoded.usePinned { crypto_core_ristretto255_is_valid_point(it.toPtr()) == 1 }
     }