Add module with support for EIP191 - closes #51

eip191/.gitignore

@@ -0,0 +1 @@
+/build

eip191/build.gradle

@@ -0,0 +1,9 @@
+dependencies {
+    implementation project(":model")
+    implementation project(":crypto")
+    implementation project(":crypto_api")
+    implementation project(":functions")
+    implementation project(":rlp")
+
+    testImplementation "com.github.walleth:khex:$khex_version"
+}

eip191/src/main/kotlin/org/kethereum/eip191/EIP191.kt

@@ -0,0 +1,19 @@
+package org.kethereum.eip191
+
+import org.kethereum.crypto.model.ECKeyPair
+import org.kethereum.crypto.signMessage
+
+/*
+*
+* http://eips.ethereum.org/EIPS/eip-191
+*
+*/
+
+
+fun ECKeyPair.signWithEIP191(version: Byte, versionSpecificData: ByteArray, message: ByteArray) =
+        signMessage(0x19.toByte().toByteArray() + version.toByteArray() + versionSpecificData + message)
+
+fun ECKeyPair.signWithEIP191PersonalSign(message: ByteArray) =
+        signWithEIP191(0x45, ("thereum Signed Message:\n" + message.size).toByteArray(), message)
+
+private fun Byte.toByteArray() = ByteArray(1) { this }

eip191/src/test/kotlin/org/kethereum/eip191/TheEIP191.kt

@@ -0,0 +1,22 @@
+package org.kethereum.eip191
+
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.jupiter.api.Test
+import org.kethereum.crypto.createEthereumKeyPair
+import org.kethereum.crypto.signMessage
+
+val KEY_PAIR = createEthereumKeyPair()
+
+class TheSignatures {
+
+    @Test
+    fun createsCorrectPersonalSignSignature() {
+
+        val payload = "Test Payload".toByteArray()
+
+        assertThat(KEY_PAIR.signWithEIP191PersonalSign(payload))
+                .isEqualTo(KEY_PAIR.signMessage(("\u0019Ethereum Signed Message:\n" + payload.size).toByteArray() + payload))
+    }
+
+
+}

settings.gradle

@@ -10,9 +10,10 @@ include ':crypto_api'
 include ':crypto_api_java_provider'
 include ':crypto_api_spongycastle'
 include ':crypto_api_wrapper'
-include ':eip155'
 include ':erc55'
 include ':erc67'
+include ':eip155'
+include ':eip191'
 include ':erc681'
 include ':erc831'
 include ':erc961'