Adding scalrmult_ native impl, starting work on sample

multiplatform-crypto-libsodium-bindings/src/commonMain/kotlin/com.ionspin.kotlin.crypto/scalarmut/ScalarMultiplication.kt

@@ -0,0 +1,34 @@
+package com.ionspin.kotlin.crypto.scalarmut
+
+/**
+ * Created by Ugljesa Jovanovic
+ * ugljesa.jovanovic@ionspin.com
+ * on 15-Oct-2020
+ */
+const val crypto_scalarmult_BYTES = 32
+const val crypto_scalarmult_SCALARBYTES = 32
+
+expect object ScalarMultiplication {
+
+    /**
+     * This function can be used to compute a shared secret q given a user's secret key and another user's public key.
+     * n is crypto_scalarmult_SCALARBYTES bytes long, p and the output are crypto_scalarmult_BYTES bytes long.
+     * q represents the X coordinate of a point on the curve. As a result, the number of possible keys is limited to
+     * the group size (≈2^252), which is smaller than the key space.
+     * For this reason, and to mitigate subtle attacks due to the fact many (p, n) pairs produce the same result,
+     * using the output of the multiplication q directly as a shared key is not recommended.
+     * A better way to compute a shared key is h(q ‖ pk1 ‖ pk2), with pk1 and pk2 being the public keys.
+     * By doing so, each party can prove what exact public key they intended to perform a key exchange with
+     * (for a given public key, 11 other public keys producing the same shared secret can be trivially computed).
+     * This can be achieved with the following code snippet:
+     */
+    fun scalarMultiplication(secretKeyN : UByteArray, publicKeyP: UByteArray) : UByteArray
+
+    /**
+     * Given a user's secret key n (crypto_scalarmult_SCALARBYTES bytes), the crypto_scalarmult_base() function
+     * computes the user's public key and puts it into q (crypto_scalarmult_BYTES bytes).
+     * crypto_scalarmult_BYTES and crypto_scalarmult_SCALARBYTES are provided for consistency,
+     * but it is safe to assume that crypto_scalarmult_BYTES == crypto_scalarmult_SCALARBYTES.
+     */
+    fun scalarMultiplicationBase(secretKeyN : UByteArray) : UByteArray
+}

multiplatform-crypto-libsodium-bindings/src/nativeMain/kotlin/com/ionspin/kotlin/crypto/scalarmut/ScalarMultiplication.kt

@@ -0,0 +1,58 @@
+package com.ionspin.kotlin.crypto.scalarmut
+
+import com.ionspin.kotlin.crypto.util.toPtr
+import kotlinx.cinterop.pin
+import libsodium.crypto_scalarmult
+import libsodium.crypto_scalarmult_base
+
+actual object ScalarMultiplication {
+
+    /**
+     * This function can be used to compute a shared secret q given a user's secret key and another user's public key.
+     * n is crypto_scalarmult_SCALARBYTES bytes long, p and the output are crypto_scalarmult_BYTES bytes long.
+     * q represents the X coordinate of a point on the curve. As a result, the number of possible keys is limited to
+     * the group size (≈2^252), which is smaller than the key space.
+     * For this reason, and to mitigate subtle attacks due to the fact many (p, n) pairs produce the same result,
+     * using the output of the multiplication q directly as a shared key is not recommended.
+     * A better way to compute a shared key is h(q ‖ pk1 ‖ pk2), with pk1 and pk2 being the public keys.
+     * By doing so, each party can prove what exact public key they intended to perform a key exchange with
+     * (for a given public key, 11 other public keys producing the same shared secret can be trivially computed).
+     * This can be achieved with the following code snippet:
+     */
+    actual fun scalarMultiplication(secretKeyN: UByteArray, publicKeyP: UByteArray): UByteArray {
+        val result = UByteArray(crypto_scalarmult_BYTES)
+        val resultPinned = result.pin()
+        val secretKeyNPinned = secretKeyN.pin()
+        val publicKeyPPinned = publicKeyP.pin()
+
+        crypto_scalarmult(resultPinned.toPtr(), secretKeyNPinned.toPtr(), publicKeyPPinned.toPtr())
+
+        resultPinned.unpin()
+        secretKeyNPinned.unpin()
+        publicKeyPPinned.unpin()
+
+        return result
+    }
+
+    /**
+     * Given a user's secret key n (crypto_scalarmult_SCALARBYTES bytes), the crypto_scalarmult_base() function
+     * computes the user's public key and puts it into q (crypto_scalarmult_BYTES bytes).
+     * crypto_scalarmult_BYTES and crypto_scalarmult_SCALARBYTES are provided for consistency,
+     * but it is safe to assume that crypto_scalarmult_BYTES == crypto_scalarmult_SCALARBYTES.
+     */
+    actual fun scalarMultiplicationBase(
+        secretKeyN: UByteArray
+    ): UByteArray {
+        val result = UByteArray(crypto_scalarmult_BYTES)
+        val resultPinned = result.pin()
+        val secretKeyNPinned = secretKeyN.pin()
+
+        crypto_scalarmult_base(resultPinned.toPtr(), secretKeyNPinned.toPtr())
+
+        resultPinned.unpin()
+        secretKeyNPinned.unpin()
+
+        return result
+    }
+
+}

sample/build.gradle.kts

@@ -144,7 +144,7 @@ kotlin {
                 implementation(kotlin(Deps.Common.stdLib))
                 implementation(kotlin(Deps.Common.test))
                 implementation(Deps.Common.kotlinBigNum)
-                implementation(project(":multiplatform-crypto-delegated"))
+                implementation(project(":multiplatform-crypto-libsodium-bindings"))
             }
         }
         val commonTest by getting {

sample/src/commonMain/kotlin/com/ionspin/kotlin/crypto/sample/Sample.kt

@@ -1,28 +1,12 @@
 package com.ionspin.kotlin.crypto.sample
 
-import com.ionspin.kotlin.crypto.Crypto
+import com.ionspin.kotlin.crypto.util.LibsodiumRandom
-import com.ionspin.kotlin.crypto.CryptoInitializerDelegated
-import com.ionspin.kotlin.crypto.CryptoPrimitives
-import com.ionspin.kotlin.crypto.hash.encodeToUByteArray
 import com.ionspin.kotlin.crypto.util.toHexString
 
+
 object Sample {
     fun runSample() {
-        println("Initializing crypto library")
+        val random = LibsodiumRandom.buf(32)
-        CryptoInitializerDelegated.initializeWithCallback {
+        println("Random: ${random.toHexString()}")
-            blake2b()
-        }
-
-
-    }
-
-    fun blake2b() {
-        println("Blake2b updateable")
-        val blake2bUpdateable = CryptoPrimitives.Blake2b.updateable()
-        blake2bUpdateable.update("test".encodeToUByteArray())
-        println(blake2bUpdateable.digest().toHexString())
-        println("Blake2b stateless")
-        val statelessResult = CryptoPrimitives.Blake2b.stateless("test".encodeToUByteArray())
-        println("Blake2b stateless: ${statelessResult.toHexString()}")
     }
 }

sample/src/linuxArm64Main/kotlin/com/ionspin/kotlin/crypto/sample/Runner.kt

@@ -2,7 +2,6 @@ import com.ionspin.kotlin.crypto.sample.Sample
 import kotlin.time.ExperimentalTime
 
 @ExperimentalTime
-
 fun main() {
 
     Sample.runSample()

sample/src/linuxMain/kotlin/com/ionspin/kotlin/crypto/sample/Runner.kt

@@ -1,7 +1,5 @@
 import com.ionspin.kotlin.crypto.sample.Sample
 
-
-
 fun main() {
     Sample.runSample()
 }

supported_bindings_list.md

@@ -156,6 +156,7 @@ native libsodium library.
 
 ## Constants
 | Constant name| Implemented |
+|-------------|-------------|
 | SODIUM_LIBRARY_VERSION_MAJOR | |   
 | SODIUM_LIBRARY_VERSION_MINOR | |   
 | crypto_aead_chacha20poly1305_ABYTES | |