Imports NostrPostr utility classes directly via source to avoid dependency issues on unnecessary libraries.

2023-07-24 11:09:43 -04:00
parent 94213ebf83
commit 480ae479af
57 changed files with 403 additions and 82 deletions
@@ -118,13 +118,6 @@ dependencies {
    // Bitcoin secp256k1 bindings to Android
    implementation 'fr.acinq.secp256k1:secp256k1-kmp-jni-android:0.10.1'

-    // Nostr Base Protocol
-    implementation('com.github.vitorpamplona.NostrPostr:nostrpostrlib:master-SNAPSHOT') {
-        exclude group:'fr.acinq.secp256k1'
-        exclude module: 'guava'
-        exclude module: 'guava-testlib'
-    }
-
    // Websockets API
    implementation 'com.squareup.okhttp3:okhttp:5.0.0-alpha.11'

@@ -14,17 +14,17 @@ import com.vitorpamplona.amethyst.model.RelaySetupInfo
 import com.vitorpamplona.amethyst.model.Settings
 import com.vitorpamplona.amethyst.model.hexToByteArray
 import com.vitorpamplona.amethyst.model.parseConnectivityType
+import com.vitorpamplona.amethyst.model.toHexKey
 import com.vitorpamplona.amethyst.service.HttpClient
+import com.vitorpamplona.amethyst.service.Persona
 import com.vitorpamplona.amethyst.service.model.ContactListEvent
 import com.vitorpamplona.amethyst.service.model.Event
 import com.vitorpamplona.amethyst.service.model.Event.Companion.getRefinedEvent
 import com.vitorpamplona.amethyst.service.model.LnZapEvent
+import com.vitorpamplona.amethyst.service.toNpub
 import com.vitorpamplona.amethyst.ui.actions.ServersAvailable
 import com.vitorpamplona.amethyst.ui.note.Nip47URI
 import fr.acinq.secp256k1.Hex
-import nostr.postr.Persona
-import nostr.postr.toHex
-import nostr.postr.toNpub
 import java.io.File
 import java.util.Locale

@@ -211,8 +211,8 @@ object LocalPreferences {
    fun saveToEncryptedStorage(account: Account) {
        val prefs = encryptedPreferences(account.userProfile().pubkeyNpub())
        prefs.edit().apply {
-            account.loggedIn.privKey?.let { putString(PrefKeys.NOSTR_PRIVKEY, it.toHex()) }
-            account.loggedIn.pubKey.let { putString(PrefKeys.NOSTR_PUBKEY, it.toHex()) }
+            account.loggedIn.privKey?.let { putString(PrefKeys.NOSTR_PRIVKEY, it.toHexKey()) }
+            account.loggedIn.pubKey.let { putString(PrefKeys.NOSTR_PUBKEY, it.toHexKey()) }
            putStringSet(PrefKeys.FOLLOWING_CHANNELS, account.followingChannels)
            putStringSet(PrefKeys.FOLLOWING_COMMUNITIES, account.followingCommunities)
            putStringSet(PrefKeys.HIDDEN_USERS, account.hiddenUsers)
@@ -10,6 +10,8 @@ import androidx.lifecycle.distinctUntilChanged
 import com.vitorpamplona.amethyst.OptOutFromFilters
 import com.vitorpamplona.amethyst.service.FileHeader
 import com.vitorpamplona.amethyst.service.NostrLnZapPaymentResponseDataSource
+import com.vitorpamplona.amethyst.service.Persona
+import com.vitorpamplona.amethyst.service.Utils
 import com.vitorpamplona.amethyst.service.model.*
 import com.vitorpamplona.amethyst.service.relays.Client
 import com.vitorpamplona.amethyst.service.relays.Constants
@@ -27,8 +29,6 @@ import kotlinx.coroutines.DelicateCoroutinesApi
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.launch
-import nostr.postr.Persona
-import nostr.postr.Utils
 import java.math.BigDecimal
 import java.net.Proxy
 import java.util.Locale
@@ -1,13 +1,12 @@
 package com.vitorpamplona.amethyst.model

+import com.vitorpamplona.amethyst.service.Bech32
+import com.vitorpamplona.amethyst.service.Persona
+import com.vitorpamplona.amethyst.service.bechToBytes
 import com.vitorpamplona.amethyst.service.nip19.Nip19
+import com.vitorpamplona.amethyst.service.toNpub
 import com.vitorpamplona.amethyst.ui.note.toShortenHex
 import fr.acinq.secp256k1.Hex
-import nostr.postr.Bech32
-import nostr.postr.Persona
-import nostr.postr.bechToBytes
-import nostr.postr.toHex
-import nostr.postr.toNpub

 /** Makes the distinction between String and Hex **/
 typealias HexKey = String
@@ -26,7 +25,7 @@ fun NoteId.toDisplayId(): String {
 fun ByteArray.toNote() = Bech32.encodeBytes(hrp = "note", this, Bech32.Encoding.Bech32)

 fun ByteArray.toHexKey(): HexKey {
-    return toHex()
+    return Hex.encode(this)
 }

 fun HexKey.hexToByteArray(): ByteArray {
@@ -3,6 +3,7 @@ package com.vitorpamplona.amethyst.model
 import androidx.compose.runtime.Immutable
 import androidx.compose.runtime.Stable
 import androidx.lifecycle.LiveData
+import com.vitorpamplona.amethyst.service.Bech32
 import com.vitorpamplona.amethyst.service.NostrSingleUserDataSource
 import com.vitorpamplona.amethyst.service.checkNotInMainThread
 import com.vitorpamplona.amethyst.service.model.BookmarkListEvent
@@ -12,14 +13,13 @@ import com.vitorpamplona.amethyst.service.model.MetadataEvent
 import com.vitorpamplona.amethyst.service.model.ReportEvent
 import com.vitorpamplona.amethyst.service.relays.EOSETime
 import com.vitorpamplona.amethyst.service.relays.Relay
+import com.vitorpamplona.amethyst.service.toNpub
 import com.vitorpamplona.amethyst.ui.actions.ImmutableListOfLists
 import com.vitorpamplona.amethyst.ui.actions.toImmutableListOfLists
 import com.vitorpamplona.amethyst.ui.components.BundledUpdate
 import com.vitorpamplona.amethyst.ui.note.toShortenHex
 import fr.acinq.secp256k1.Hex
 import kotlinx.coroutines.Dispatchers
-import nostr.postr.Bech32
-import nostr.postr.toNpub
 import java.math.BigDecimal
 import java.util.regex.Pattern

@@ -0,0 +1,200 @@
+package com.vitorpamplona.amethyst.service
+
+/*
+ * Copyright 2020 ACINQ SAS
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import kotlin.jvm.JvmStatic
+
+/**
+ * Bech32 works with 5 bits values, we use this type to make it explicit: whenever you see Int5 it means 5 bits values,
+ * and whenever you see Byte it means 8 bits values.
+ */
+public typealias Int5 = Byte
+
+/**
+ * Bech32 and Bech32m address formats.
+ * See https://github.com/bitcoin/bips/blob/master/bip-0173.mediawiki and https://github.com/bitcoin/bips/blob/master/bip-0350.mediawiki.
+ */
+object Bech32 {
+    public const val alphabet: String = "qpzry9x8gf2tvdw0s3jn54khce6mua7l"
+
+    public enum class Encoding(public val constant: Int) {
+        Bech32(1),
+        Bech32m(0x2bc830a3),
+        Beck32WithoutChecksum(0)
+    }
+
+    // char -> 5 bits value
+    private val map = Array<Int5>(255) { -1 }
+
+    init {
+        for (i in 0..alphabet.lastIndex) {
+            map[alphabet[i].code] = i.toByte()
+        }
+    }
+
+    private fun expand(hrp: String): Array<Int5> {
+        val result = Array<Int5>(hrp.length + 1 + hrp.length) { 0 }
+        for (i in hrp.indices) {
+            result[i] = hrp[i].code.shr(5).toByte()
+            result[hrp.length + 1 + i] = (hrp[i].code and 31).toByte()
+        }
+        result[hrp.length] = 0
+        return result
+    }
+
+    private fun polymod(values: Array<Int5>, values1: Array<Int5>): Int {
+        val GEN = arrayOf(0x3b6a57b2, 0x26508e6d, 0x1ea119fa, 0x3d4233dd, 0x2a1462b3)
+        var chk = 1
+        values.forEach { v ->
+            val b = chk shr 25
+            chk = ((chk and 0x1ffffff) shl 5) xor v.toInt()
+            for (i in 0..5) {
+                if (((b shr i) and 1) != 0) chk = chk xor GEN[i]
+            }
+        }
+        values1.forEach { v ->
+            val b = chk shr 25
+            chk = ((chk and 0x1ffffff) shl 5) xor v.toInt()
+            for (i in 0..5) {
+                if (((b shr i) and 1) != 0) chk = chk xor GEN[i]
+            }
+        }
+        return chk
+    }
+
+    /**
+     * @param hrp human readable prefix
+     * @param int5s 5-bit data
+     * @param encoding encoding to use (bech32 or bech32m)
+     * @return hrp + data encoded as a Bech32 string
+     */
+    @JvmStatic
+    public fun encode(hrp: String, int5s: Array<Int5>, encoding: Encoding): String {
+        require(hrp.lowercase() == hrp || hrp.uppercase() == hrp) { "mixed case strings are not valid bech32 prefixes" }
+        val data = int5s.toByteArray().toTypedArray()
+        val checksum = when (encoding) {
+            Encoding.Beck32WithoutChecksum -> arrayOf()
+            else -> checksum(hrp, data, encoding)
+        }
+        return hrp + "1" + (data + checksum).map { i -> alphabet[i.toInt()] }.toCharArray().concatToString()
+    }
+
+    /**
+     * @param hrp human readable prefix
+     * @param data data to encode
+     * @param encoding encoding to use (bech32 or bech32m)
+     * @return hrp + data encoded as a Bech32 string
+     */
+    @JvmStatic
+    public fun encodeBytes(hrp: String, data: ByteArray, encoding: Encoding): String = encode(hrp, eight2five(data), encoding)
+
+    /**
+     * decodes a bech32 string
+     * @param bech32 bech32 string
+     * @param noChecksum if true, the bech32 string doesn't have a checksum
+     * @return a (hrp, data, encoding) tuple
+     */
+    @JvmStatic
+    public fun decode(bech32: String, noChecksum: Boolean = false): Triple<String, Array<Int5>, Encoding> {
+        require(bech32.lowercase() == bech32 || bech32.uppercase() == bech32) { "mixed case strings are not valid bech32" }
+        bech32.forEach { require(it.code in 33..126) { "invalid character " } }
+        val input = bech32.lowercase()
+        val pos = input.lastIndexOf('1')
+        val hrp = input.take(pos)
+        require(hrp.length in 1..83) { "hrp must contain 1 to 83 characters" }
+        val data = Array<Int5>(input.length - pos - 1) { 0 }
+        for (i in 0..data.lastIndex) data[i] = map[input[pos + 1 + i].code]
+        return if (noChecksum) {
+            Triple(hrp, data, Encoding.Beck32WithoutChecksum)
+        } else {
+            val encoding = when (polymod(expand(hrp), data)) {
+                Encoding.Bech32.constant -> Encoding.Bech32
+                Encoding.Bech32m.constant -> Encoding.Bech32m
+                else -> throw IllegalArgumentException("invalid checksum for $bech32")
+            }
+            Triple(hrp, data.dropLast(6).toTypedArray(), encoding)
+        }
+    }
+
+    /**
+     * decodes a bech32 string
+     * @param bech32 bech32 string
+     * @param noChecksum if true, the bech32 string doesn't have a checksum
+     * @return a (hrp, data, encoding) tuple
+     */
+    @JvmStatic
+    public fun decodeBytes(bech32: String, noChecksum: Boolean = false): Triple<String, ByteArray, Encoding> {
+        val (hrp, int5s, encoding) = decode(bech32, noChecksum)
+        return Triple(hrp, five2eight(int5s, 0), encoding)
+    }
+
+    /**
+     * @param hrp Human Readable Part
+     * @param data data (a sequence of 5 bits integers)
+     * @param encoding encoding to use (bech32 or bech32m)
+     * @return a checksum computed over hrp and data
+     */
+    private fun checksum(hrp: String, data: Array<Int5>, encoding: Encoding): Array<Int5> {
+        val values = expand(hrp) + data
+        val poly = polymod(values, arrayOf(0.toByte(), 0.toByte(), 0.toByte(), 0.toByte(), 0.toByte(), 0.toByte())) xor encoding.constant
+        return Array(6) { i -> (poly.shr(5 * (5 - i)) and 31).toByte() }
+    }
+
+    /**
+     * @param input a sequence of 8 bits integers
+     * @return a sequence of 5 bits integers
+     */
+    @JvmStatic
+    public fun eight2five(input: ByteArray): Array<Int5> {
+        var buffer = 0L
+        val output = ArrayList<Int5>()
+        var count = 0
+        input.forEach { b ->
+            buffer = (buffer shl 8) or (b.toLong() and 0xff)
+            count += 8
+            while (count >= 5) {
+                output.add(((buffer shr (count - 5)) and 31).toByte())
+                count -= 5
+            }
+        }
+        if (count > 0) output.add(((buffer shl (5 - count)) and 31).toByte())
+        return output.toTypedArray()
+    }
+
+    /**
+     * @param input a sequence of 5 bits integers
+     * @return a sequence of 8 bits integers
+     */
+    @JvmStatic
+    public fun five2eight(input: Array<Int5>, offset: Int): ByteArray {
+        var buffer = 0L
+        val output = ArrayList<Byte>()
+        var count = 0
+        for (i in offset..input.lastIndex) {
+            val b = input[i]
+            buffer = (buffer shl 5) or (b.toLong() and 31)
+            count += 5
+            while (count >= 8) {
+                output.add(((buffer shr (count - 8)) and 0xff).toByte())
+                count -= 8
+            }
+        }
+        require(count <= 4) { "Zero-padding of more than 4 bits" }
+        require((buffer and ((1L shl count) - 1L)) == 0L) { "Non-zero padding in 8-to-5 conversion" }
+        return output.toByteArray()
+    }
+}
@@ -0,0 +1,34 @@
+package com.vitorpamplona.amethyst.service
+
+import com.vitorpamplona.amethyst.model.toHexKey
+
+class Persona(
+    privKey: ByteArray? = null,
+    pubKey: ByteArray? = null
+) {
+    val privKey: ByteArray?
+    val pubKey: ByteArray
+
+    init {
+        if (privKey == null) {
+            if (pubKey == null) {
+                // create new, random keys
+                this.privKey = Utils.privkeyCreate()
+                this.pubKey = Utils.pubkeyCreate(this.privKey)
+            } else {
+                // this is a read-only account
+                check(pubKey.size == 32)
+                this.privKey = null
+                this.pubKey = pubKey
+            }
+        } else {
+            // as private key is provided, ignore the public key and set keys according to private key
+            this.privKey = privKey
+            this.pubKey = Utils.pubkeyCreate(privKey)
+        }
+    }
+
+    override fun toString(): String {
+        return "Persona(privateKey=${privKey?.toHexKey()}, publicKey=${pubKey.toHexKey()}"
+    }
+}
@@ -0,0 +1,97 @@
+package com.vitorpamplona.amethyst.service
+
+import fr.acinq.secp256k1.Hex
+import fr.acinq.secp256k1.Secp256k1
+import java.security.MessageDigest
+import java.security.SecureRandom
+import java.util.Base64
+import javax.crypto.Cipher
+import javax.crypto.spec.IvParameterSpec
+import javax.crypto.spec.SecretKeySpec
+
+object Utils {
+    private val sha256: MessageDigest = MessageDigest.getInstance("SHA-256")
+
+    /**
+     * Provides a 32B "private key" aka random number
+     */
+    fun privkeyCreate(): ByteArray {
+        val bytes = ByteArray(32)
+        random.nextBytes(bytes)
+        return bytes
+    }
+
+    fun pubkeyCreate(privKey: ByteArray) =
+        secp256k1.pubKeyCompress(secp256k1.pubkeyCreate(privKey)).copyOfRange(1, 33)
+
+    fun sign(data: ByteArray, privKey: ByteArray): ByteArray =
+        secp256k1.signSchnorr(data, privKey, null)
+
+    fun encrypt(msg: String, privateKey: ByteArray, pubKey: ByteArray): String {
+        val sharedSecret = getSharedSecret(privateKey, pubKey)
+        return encrypt(msg, sharedSecret)
+    }
+
+    fun encrypt(msg: String, sharedSecret: ByteArray): String {
+        val iv = ByteArray(16)
+        random.nextBytes(iv)
+        val cipher = Cipher.getInstance("AES/CBC/PKCS5Padding")
+        cipher.init(Cipher.ENCRYPT_MODE, SecretKeySpec(sharedSecret, "AES"), IvParameterSpec(iv))
+        val ivBase64 = Base64.getEncoder().encode(iv)
+        val encryptedMsg = cipher.doFinal(msg.toByteArray())
+        val encryptedMsgBase64 = Base64.getEncoder().encode(encryptedMsg)
+        return "$encryptedMsgBase64?iv=$ivBase64"
+    }
+
+    fun decrypt(msg: String, privateKey: ByteArray, pubKey: ByteArray): String {
+        val sharedSecret = getSharedSecret(privateKey, pubKey)
+        return decrypt(msg, sharedSecret)
+    }
+
+    fun decrypt(msg: String, sharedSecret: ByteArray): String {
+        val parts = msg.split("?iv=")
+        val iv = parts[1].run { Base64.getDecoder().decode(this) }
+        val encryptedMsg = parts.first().run { Base64.getDecoder().decode(this) }
+        val cipher = Cipher.getInstance("AES/CBC/PKCS5Padding")
+        cipher.init(Cipher.DECRYPT_MODE, SecretKeySpec(sharedSecret, "AES"), IvParameterSpec(iv))
+        return String(cipher.doFinal(encryptedMsg))
+    }
+
+    /**
+     * @return 32B shared secret
+     */
+    fun getSharedSecret(privateKey: ByteArray, pubKey: ByteArray): ByteArray =
+        secp256k1.pubKeyTweakMul(Hex.decode("02") + pubKey, privateKey).copyOfRange(1, 33)
+
+    fun sha256(byteArray: ByteArray): ByteArray = sha256.digest(byteArray)
+
+    private val secp256k1 = Secp256k1.get()
+
+    private val random = SecureRandom()
+}
+
+fun Int.toByteArray(): ByteArray {
+    val bytes = ByteArray(4)
+    (0..3).forEach {
+        bytes[3 - it] = ((this ushr (8 * it)) and 0xFFFF).toByte()
+    }
+    return bytes
+}
+
+fun ByteArray.toNsec() = Bech32.encodeBytes(hrp = "nsec", this, Bech32.Encoding.Bech32)
+fun ByteArray.toNpub() = Bech32.encodeBytes(hrp = "npub", this, Bech32.Encoding.Bech32)
+
+fun String.bechToBytes(hrp: String? = null): ByteArray {
+    val decodedForm = Bech32.decodeBytes(this)
+    hrp?.also {
+        if (it != decodedForm.first) {
+            throw IllegalArgumentException("Expected $it but obtained ${decodedForm.first}")
+        }
+    }
+    return decodedForm.second
+}
+
+/**
+ * Interpret the string as Bech32 encoded and return hrp and ByteArray as Pair
+ */
+fun String.bechToBytesWithHrp() = Bech32.decodeBytes(this).run { Pair(first, second) }
@@ -2,6 +2,7 @@ package com.vitorpamplona.amethyst.service.lnurl

 import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
 import com.vitorpamplona.amethyst.BuildConfig
+import com.vitorpamplona.amethyst.service.Bech32
 import com.vitorpamplona.amethyst.service.HttpClient
 import com.vitorpamplona.amethyst.service.checkNotInMainThread
 import kotlinx.coroutines.CoroutineScope
@@ -9,7 +10,6 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
-import nostr.postr.Bech32
 import okhttp3.Call
 import okhttp3.Callback
 import okhttp3.Request
@@ -4,11 +4,11 @@ import android.util.Log
 import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.hexToByteArray
 import com.vitorpamplona.amethyst.model.toHexKey
+import com.vitorpamplona.amethyst.service.Bech32
+import com.vitorpamplona.amethyst.service.bechToBytes
 import com.vitorpamplona.amethyst.service.nip19.Tlv
+import com.vitorpamplona.amethyst.service.toByteArray
 import fr.acinq.secp256k1.Hex
-import nostr.postr.Bech32
-import nostr.postr.bechToBytes
-import nostr.postr.toByteArray

@Immutable
 data class ATag(val kind: Int, val pubKeyHex: String, val dTag: String, val relay: String?) {
@@ -4,7 +4,7 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils

@Immutable
 class AudioTrackEvent(
@@ -4,7 +4,7 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils

@Immutable
 class BookmarkListEvent(
@@ -5,7 +5,7 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils

@Immutable
 class ChannelCreateEvent(
@@ -4,7 +4,7 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils

@Immutable
 class ChannelHideMessageEvent(
@@ -4,7 +4,7 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils

@Immutable
 class ChannelMessageEvent(
@@ -5,7 +5,7 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils

@Immutable
 class ChannelMetadataEvent(
@@ -4,7 +4,7 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils

@Immutable
 class ChannelMuteUserEvent(
@@ -4,7 +4,7 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils

@Immutable
 class ClassifiedsEvent(
@@ -4,7 +4,7 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils

@Immutable
 class CommunityDefinitionEvent(
@@ -5,8 +5,8 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
+import com.vitorpamplona.amethyst.service.Utils
 import com.vitorpamplona.amethyst.service.relays.Client
-import nostr.postr.Utils

@Immutable
 class CommunityPostApprovalEvent(
@@ -8,7 +8,7 @@ import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.decodePublicKey
 import com.vitorpamplona.amethyst.model.toHexKey
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils

@Immutable
 data class Contact(val pubKeyHex: String, val relayUri: String?)
@@ -4,7 +4,7 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils

@Immutable
 class DeletionEvent(
@@ -4,7 +4,7 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils

@Immutable
 class EmojiPackEvent(
@@ -4,7 +4,7 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils

@Immutable
 class EmojiPackSelectionEvent(
@@ -7,11 +7,10 @@ import com.google.gson.annotations.SerializedName
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
+import com.vitorpamplona.amethyst.service.Utils
 import com.vitorpamplona.amethyst.service.nip19.Nip19
 import fr.acinq.secp256k1.Hex
 import fr.acinq.secp256k1.Secp256k1
-import nostr.postr.Utils
-import nostr.postr.toHex
 import java.lang.reflect.Type
 import java.math.BigDecimal
 import java.security.MessageDigest
@@ -251,7 +250,7 @@ open class Event(
            src: ByteArray,
            typeOfSrc: Type?,
            context: JsonSerializationContext?
-        ) = JsonPrimitive(src.toHex())
+        ) = JsonPrimitive(src.toHexKey())
    }

    companion object {
@@ -4,7 +4,7 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils

@Immutable
 class FileHeaderEvent(
@@ -5,7 +5,7 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils
 import java.util.Base64

@Immutable
@@ -4,7 +4,7 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils

@Immutable
 class FileStorageHeaderEvent(
@@ -5,7 +5,7 @@ import androidx.compose.runtime.Immutable
 import com.google.gson.reflect.TypeToken
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.hexToByteArray
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils

@Immutable
 abstract class GeneralListEvent(
@@ -4,8 +4,8 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
+import com.vitorpamplona.amethyst.service.Utils
 import com.vitorpamplona.amethyst.service.relays.Client
-import nostr.postr.Utils

@Immutable
 class GenericRepostEvent(
@@ -4,7 +4,7 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils
 import java.security.MessageDigest

@Immutable
@@ -4,7 +4,7 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils

@Immutable
 class HighlightEvent(
@@ -4,7 +4,7 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils

@Immutable
 class LiveActivitiesChatMessageEvent(
@@ -4,7 +4,7 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils

@Immutable
 class LiveActivitiesEvent(
@@ -10,7 +10,7 @@ import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.hexToByteArray
 import com.vitorpamplona.amethyst.model.toHexKey
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils
 import java.lang.reflect.Type

@Immutable
@@ -8,7 +8,7 @@ import com.google.gson.JsonElement
 import com.google.gson.JsonParseException
 import com.google.gson.annotations.SerializedName
 import com.vitorpamplona.amethyst.model.HexKey
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils
 import java.lang.reflect.Type

@Immutable
@@ -2,8 +2,8 @@ package com.vitorpamplona.amethyst.service.model

 import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.*
-import nostr.postr.Bech32
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Bech32
+import com.vitorpamplona.amethyst.service.Utils
 import java.nio.charset.Charset
 import java.security.MessageDigest
 import java.security.SecureRandom
@@ -4,7 +4,7 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils

@Immutable
 class LongTextNoteEvent(
@@ -10,7 +10,7 @@ import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.UserMetadata
 import com.vitorpamplona.amethyst.model.toHexKey
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils
 import java.io.ByteArrayInputStream

@Stable
@@ -7,7 +7,7 @@ import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.hexToByteArray
 import com.vitorpamplona.amethyst.model.toHexKey
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils

@Immutable
 class MuteListEvent(
@@ -4,7 +4,7 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils

@Immutable
 class NNSEvent(
@@ -4,10 +4,10 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
+import com.vitorpamplona.amethyst.service.Utils
 import kotlinx.collections.immutable.ImmutableSet
 import kotlinx.collections.immutable.persistentSetOf
 import kotlinx.collections.immutable.toImmutableSet
-import nostr.postr.Utils

@Immutable
 class PeopleListEvent(
@@ -4,7 +4,7 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils

@Immutable
 class PinListEvent(
@@ -4,7 +4,7 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils

 const val POLL_OPTION = "poll_option"
 const val VALUE_MAXIMUM = "value_maximum"
@@ -6,9 +6,8 @@ import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
 import com.vitorpamplona.amethyst.service.HexValidator
+import com.vitorpamplona.amethyst.service.Utils
 import fr.acinq.secp256k1.Hex
-import nostr.postr.Utils
-import nostr.postr.toHex

@Immutable
 class PrivateDmEvent(
@@ -97,7 +96,7 @@ class PrivateDmEvent(
            val pubKey = Utils.pubkeyCreate(privateKey).toHexKey()
            val tags = mutableListOf<List<String>>()
            publishedRecipientPubKey?.let {
-                tags.add(listOf("p", publishedRecipientPubKey.toHex()))
+                tags.add(listOf("p", publishedRecipientPubKey.toHexKey()))
            }
            replyTos?.forEach {
                tags.add(listOf("e", it))
@@ -4,7 +4,7 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils

@Immutable
 class ReactionEvent(
@@ -4,7 +4,7 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils
 import java.net.URI

@Immutable
@@ -4,7 +4,7 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils

@Immutable
 class RelayAuthEvent(
@@ -4,7 +4,7 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils

@Immutable
 class RelaySetEvent(
@@ -4,7 +4,7 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
-import nostr.postr.Utils
+import com.vitorpamplona.amethyst.service.Utils

@Immutable
 data class ReportedKey(val key: String, val reportType: ReportEvent.ReportType)
@@ -4,8 +4,8 @@ import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
+import com.vitorpamplona.amethyst.service.Utils
 import com.vitorpamplona.amethyst.service.relays.Client
-import nostr.postr.Utils

@Immutable
 class RepostEvent(
@@ -6,8 +6,8 @@ import com.linkedin.urls.detection.UrlDetectorOptions
 import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.TimeUtils
 import com.vitorpamplona.amethyst.model.toHexKey
+import com.vitorpamplona.amethyst.service.Utils
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.findHashtags
-import nostr.postr.Utils

@Immutable
 class TextNoteEvent(
@@ -4,9 +4,9 @@ import android.util.Log
 import androidx.compose.runtime.Immutable
 import com.vitorpamplona.amethyst.model.hexToByteArray
 import com.vitorpamplona.amethyst.model.toHexKey
-import nostr.postr.Bech32
-import nostr.postr.bechToBytes
-import nostr.postr.toByteArray
+import com.vitorpamplona.amethyst.service.Bech32
+import com.vitorpamplona.amethyst.service.bechToBytes
+import com.vitorpamplona.amethyst.service.toByteArray
 import java.util.regex.Pattern

 object Nip19 {
@@ -118,6 +118,7 @@ import com.vitorpamplona.amethyst.service.model.RelaySetEvent
 import com.vitorpamplona.amethyst.service.model.ReportEvent
 import com.vitorpamplona.amethyst.service.model.RepostEvent
 import com.vitorpamplona.amethyst.service.model.TextNoteEvent
+import com.vitorpamplona.amethyst.service.toNpub
 import com.vitorpamplona.amethyst.ui.actions.ImmutableListOfLists
 import com.vitorpamplona.amethyst.ui.actions.NewRelayListView
 import com.vitorpamplona.amethyst.ui.actions.toImmutableListOfLists
@@ -191,7 +192,6 @@ import kotlinx.collections.immutable.persistentSetOf
 import kotlinx.collections.immutable.toImmutableList
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
-import nostr.postr.toNpub
 import java.io.File
 import java.math.BigDecimal
 import java.net.URL
@@ -1,9 +1,9 @@
 package com.vitorpamplona.amethyst.ui.note

-import nostr.postr.toHex
+import com.vitorpamplona.amethyst.model.toHexKey

 fun ByteArray.toShortenHex(): String {
-    return toHex().toShortenHex()
+    return toHexKey().toShortenHex()
 }

 fun String.toShortenHex(): String {
@@ -9,6 +9,8 @@ import com.vitorpamplona.amethyst.ServiceManager
 import com.vitorpamplona.amethyst.model.Account
 import com.vitorpamplona.amethyst.model.hexToByteArray
 import com.vitorpamplona.amethyst.service.HttpClient
+import com.vitorpamplona.amethyst.service.Persona
+import com.vitorpamplona.amethyst.service.bechToBytes
 import com.vitorpamplona.amethyst.service.nip19.Nip19
 import fr.acinq.secp256k1.Hex
 import kotlinx.coroutines.CoroutineScope
@@ -20,8 +22,6 @@ import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.launch
-import nostr.postr.Persona
-import nostr.postr.bechToBytes
 import java.util.regex.Pattern

@Stable
@@ -44,12 +44,12 @@ import com.halilibo.richtext.ui.material.MaterialRichText
 import com.halilibo.richtext.ui.resolveDefaults
 import com.vitorpamplona.amethyst.R
 import com.vitorpamplona.amethyst.model.Account
+import com.vitorpamplona.amethyst.service.toNsec
 import com.vitorpamplona.amethyst.ui.actions.CloseButton
 import com.vitorpamplona.amethyst.ui.note.authenticate
 import com.vitorpamplona.amethyst.ui.theme.ButtonBorder
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.launch
-import nostr.postr.toNsec

@Composable
 fun AccountBackupDialog(account: Account, onClose: () -> Unit) {