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75 changes: 75 additions & 0 deletions
75
apollo/src/commonMain/kotlin/io/iohk/atala/prism/apollo/derivation/Sodium.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,75 @@ | ||
| package io.iohk.atala.prism.apollo.derivation | ||
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| import com.ionspin.kotlin.bignum.integer.util.toBigEndianUByteArray | ||
| import com.ionspin.kotlin.crypto.box.Box | ||
| import com.ionspin.kotlin.crypto.keyexchange.KeyExchange | ||
| import org.kotlincrypto.macs.hmac.sha2.HmacSHA512 | ||
| import kotlin.js.ExperimentalJsExport | ||
| import kotlin.js.JsExport | ||
|
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| // this is just for testing, actual code needs to be in HDKey | ||
| // have been using HDKey companion functions to avoid breaking | ||
|
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| @OptIn(ExperimentalJsExport::class) | ||
| @JsExport | ||
| data class Key(val key: ByteArray, val chainCode: ByteArray) | ||
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| @OptIn(ExperimentalJsExport::class) | ||
| @JsExport | ||
| class Sodium { | ||
| private val hardenedOffset = 0x80000000 | ||
| fun getMasterKeyFromSeed(seed: ByteArray): Key { | ||
| val init = "ed25519 seed".encodeToByteArray() | ||
| val hmac = HmacSHA512(init) | ||
| hmac.update(seed) | ||
| val result = hmac.doFinal() | ||
| val key = result.copyOfRange(0, 32) | ||
| val chainCode = result.copyOfRange(32, 64) | ||
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| return Key(key, chainCode) | ||
| } | ||
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| @OptIn(ExperimentalUnsignedTypes::class) | ||
| fun derive(seed: ByteArray, index: Int): Key { | ||
| val masterKey = getMasterKeyFromSeed(seed) | ||
| val offset = (index + hardenedOffset).toUInt() | ||
| val bytes = offset.toBigEndianUByteArray().toByteArray() | ||
| val data = byteArrayOf(0).plus(masterKey.key.plus(bytes)) | ||
| val hmac = HmacSHA512(masterKey.chainCode) | ||
| val result = hmac.doFinal(data) | ||
| val key = result.copyOfRange(0, 32) | ||
| val chainCode = result.copyOfRange(32, 64) | ||
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| return Key(key, chainCode) | ||
| } | ||
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| @OptIn(ExperimentalStdlibApi::class) | ||
| fun keygen(seed: ByteArray): Key { | ||
| // this KeyExchange.seedKeyPair might be usable for X25519 | ||
| // would need to be ported to HDKey | ||
| val kkp = KeyExchange.seedKeypair(seed.toUByteArray()) | ||
| // no idea what Box is, just used it for testing to simulate another Key | ||
| val bkp = Box.seedKeypair(seed.toUByteArray()) | ||
| // val skp = Signature.seedKeypair(seed.toUByteArray()) | ||
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| val clientSessionKeyPair = KeyExchange.clientSessionKeys( | ||
| bkp.publicKey, | ||
| bkp.secretKey, | ||
| kkp.publicKey | ||
| ) | ||
| val serverSessionKeyPair = KeyExchange.serverSessionKeys( | ||
| kkp.publicKey, | ||
| kkp.secretKey, | ||
| bkp.publicKey | ||
| ) | ||
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| val a = clientSessionKeyPair.sendKey.toHexString() | ||
| val b = serverSessionKeyPair.receiveKey.toHexString() | ||
| // matched should be true | ||
| val matched = a == b | ||
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| return Key(kkp.secretKey.toByteArray(), kkp.publicKey.toByteArray()) | ||
| } | ||
|
|
||
| } |
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24
apollo/src/commonTest/kotlin/io/iohk/atala/prism/apollo/derivation/SodiumTest.kt
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,24 @@ | ||
| package io.iohk.atala.prism.apollo.derivation | ||
|
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| import com.ionspin.kotlin.crypto.LibsodiumInitializer | ||
| import io.iohk.atala.prism.apollo.utils.toHexString | ||
| import kotlin.test.Test | ||
| import kotlin.test.assertEquals | ||
|
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| class SodiumTest { | ||
| @OptIn(ExperimentalStdlibApi::class) | ||
| @Test | ||
| fun test() { | ||
| LibsodiumInitializer.initializeWithCallback { | ||
| val seedHex = "fffcf9f6f3f0edeae7e4e1dedbd8d5d2cfccc9c6c3c0bdbab7b4b1aeaba8a5a29f9c999693908d8a8784817e7b7875726f6c696663605d5a5754514e4b484542" | ||
| val seed = seedHex.hexToByteArray() | ||
| val result = Sodium().getMasterKeyFromSeed(seed) | ||
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| val a = Sodium().keygen(seed) | ||
| val b = Sodium().keygen("77076d0a7318a57d3c16c17251b26645df4c2f87ebc0992ab177fba51db92c2a".hexToByteArray()) | ||
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| val expected = result.chainCode.toHexString() | ||
| assertEquals("171cb88b1b3c1db25add599712e36245d75bc65a1a5c9e18d76f9f2b1eab4012", result.key.toHexString()) | ||
| } | ||
| } | ||
| } |