fix(secp256k1): Exposing EC Secp256K1

hyperledger · Aug 14, 2023 · 5e3a83c · 5e3a83c
1 parent 2865b24
commit 5e3a83c
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Showing 3 changed files with 77 additions and 2 deletions.
diff --git a/...yption/src/commonMain/kotlin/io/iohk/atala/prism/apollo/utils/KMMECSecp256k1PrivateKey.kt b/...yption/src/commonMain/kotlin/io/iohk/atala/prism/apollo/utils/KMMECSecp256k1PrivateKey.kt
@@ -32,6 +32,27 @@ class KMMECSecp256k1PrivateKey : Encodable {
         return raw
     }
 
+    /**
+     * Sign the provided data with EC Secp256K1
+     * @param data data that you want to sign
+     * @return signature
+     */
+    fun sign(data: ByteArray): ByteArray {
+        val secp256k1Lib = Secp256k1Lib()
+        return secp256k1Lib.sign(raw, data)
+    }
+
+    /**
+     * Verify provided signature with the public key that is generated using the private key
+     * @param signature that we need to verify
+     * @param data that was used in signature
+     * @return true when valid, false when invalid
+     */
+    fun verify(signature: ByteArray, data: ByteArray): Boolean {
+        val secp256k1Lib = Secp256k1Lib()
+        return secp256k1Lib.verify(getPublicKey().raw, signature, data)
+    }
+
     companion object : KMMECSecp256k1PrivateKeyCommonStaticInterface {
         override fun secp256k1FromByteArray(d: ByteArray): KMMECSecp256k1PrivateKey {
             return KMMECSecp256k1PrivateKey(d)

diff --git a/...ryption/src/commonMain/kotlin/io/iohk/atala/prism/apollo/utils/KMMECSecp256k1PublicKey.kt b/...ryption/src/commonMain/kotlin/io/iohk/atala/prism/apollo/utils/KMMECSecp256k1PublicKey.kt
@@ -2,6 +2,7 @@ package io.iohk.atala.prism.apollo.utils
 
 import com.ionspin.kotlin.bignum.integer.BigInteger
 import com.ionspin.kotlin.bignum.integer.Sign
+import io.iohk.atala.prism.apollo.secp256k1.Secp256k1Lib
 import kotlin.js.ExperimentalJsExport
 import kotlin.js.JsExport
 import kotlin.js.JsName
@@ -55,8 +56,6 @@ class KMMECSecp256k1PublicKey {
         this.raw = raw
     }
 
-    companion object : KMMECSecp256k1PublicKeyCommonStaticInterface
-
     fun getCurvePoint(): KMMECPoint {
         if (raw.size != 65) {
             throw IllegalArgumentException("Public key should be 65 bytes long")
@@ -69,4 +68,17 @@ class KMMECSecp256k1PublicKey {
 
         return KMMECPoint(x, y)
     }
+
+    /**
+     * Verify provided signature
+     * @param signature that we need to verify
+     * @param data that was used in signature
+     * @return true when valid, false when invalid
+     */
+    fun verify(signature: ByteArray, data: ByteArray): Boolean {
+        val secp256k1Lib = Secp256k1Lib()
+        return secp256k1Lib.verify(raw, signature, data)
+    }
+
+    companion object : KMMECSecp256k1PublicKeyCommonStaticInterface
 }
diff --git a/...ryption/src/commonTest/kotlin/io/iohk/atala/prism/apollo/utils/KMMECSecp256k1KeysTests.kt b/...ryption/src/commonTest/kotlin/io/iohk/atala/prism/apollo/utils/KMMECSecp256k1KeysTests.kt
@@ -0,0 +1,42 @@
+package io.iohk.atala.prism.apollo.utils
+
+import io.iohk.atala.prism.apollo.base64.base64UrlDecodedBytes
+import io.iohk.atala.prism.apollo.base64.base64UrlEncoded
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertTrue
+
+class KMMECSecp256k1KeysTests {
+    @Test
+    fun testSigning() {
+        val privateKeyBase64 = "N_JFgvYaReyRXwassz5FHg33A4I6dczzdXrjdHGksmg"
+        val base64ByteArray = privateKeyBase64.base64UrlDecodedBytes
+        val privateKey = KMMECSecp256k1PrivateKey.secp256k1FromByteArray(base64ByteArray)
+        val message = "Test"
+        val signature = privateKey.sign(message.encodeToByteArray())
+        assertEquals("MEUCIQCFeGlhJrH-9R70X4JzrurWs52SwuxCnJ8ky6riFwMOrwIgT7zlLo7URMHW5tiMgG73IOw2Dm3XyLl1iqW1-t5NFWQ", signature.base64UrlEncoded)
+    }
+
+    @Test
+    fun testVerifyingFromPrivateKey() {
+        val privateKeyBase64 = "N_JFgvYaReyRXwassz5FHg33A4I6dczzdXrjdHGksmg"
+        val base64ByteArray = privateKeyBase64.base64UrlDecodedBytes
+        val privateKey = KMMECSecp256k1PrivateKey.secp256k1FromByteArray(base64ByteArray)
+        val message = "Test"
+        val signature = privateKey.sign(message.encodeToByteArray())
+        assertEquals("MEUCIQCFeGlhJrH-9R70X4JzrurWs52SwuxCnJ8ky6riFwMOrwIgT7zlLo7URMHW5tiMgG73IOw2Dm3XyLl1iqW1-t5NFWQ", signature.base64UrlEncoded)
+        assertTrue(privateKey.verify(signature, message.encodeToByteArray()))
+    }
+
+    @Test
+    fun testVerifyingFromPublicKey() {
+        val privateKeyBase64 = "N_JFgvYaReyRXwassz5FHg33A4I6dczzdXrjdHGksmg"
+        val base64ByteArray = privateKeyBase64.base64UrlDecodedBytes
+        val privateKey = KMMECSecp256k1PrivateKey.secp256k1FromByteArray(base64ByteArray)
+        val message = "Test"
+        val signature = privateKey.sign(message.encodeToByteArray())
+        assertEquals("MEUCIQCFeGlhJrH-9R70X4JzrurWs52SwuxCnJ8ky6riFwMOrwIgT7zlLo7URMHW5tiMgG73IOw2Dm3XyLl1iqW1-t5NFWQ", signature.base64UrlEncoded)
+        val publicKey = privateKey.getPublicKey()
+        assertTrue(publicKey.verify(signature, message.encodeToByteArray()))
+    }
+}