From 4458f6ceff927f04cd2fcccf93492dfa8de5c9aa Mon Sep 17 00:00:00 2001
From: Pat Garrity <pfm@garrity.co>
Date: Wed, 6 May 2026 22:46:36 -0500
Subject: [PATCH] (minor) update library to depend on gs-std

---
 build.sbt                                     |  10 ++
 .../scala/gs/crypto/v0/argon2/Argon2.scala    |   6 +-
 .../gs/crypto/v0/argon2/Argon2Hash.scala      |   4 +-
 .../gs/crypto/v0/argon2/Argon2Secret.scala    |   6 +-
 .../gs/crypto/v0/argon2/Argon2Tests.scala     |   4 +-
 .../scala/gs/crypto/v0/Base64Decoder.scala    |  36 ----
 .../scala/gs/crypto/v0/Base64Encoder.scala    |  51 ------
 .../scala/gs/crypto/v0/BaseKeyLoader.scala    |  10 +-
 .../src/main/scala/gs/crypto/v0/Decoder.scala |   4 -
 .../src/main/scala/gs/crypto/v0/Encode.scala  |  58 -------
 .../src/main/scala/gs/crypto/v0/Encoded.scala | 159 ------------------
 .../src/main/scala/gs/crypto/v0/Encoder.scala |  44 -----
 .../main/scala/gs/crypto/v0/HexDecoder.scala  |  23 ---
 .../main/scala/gs/crypto/v0/HexEncoder.scala  |  23 ---
 .../gs/crypto/v0/RandomByteProvider.scala     |  77 ---------
 .../main/scala/gs/crypto/v0/Signature.scala   |   9 +-
 .../src/main/scala/gs/crypto/v0/rsa/Rsa.scala |  12 +-
 .../gs/crypto/v0/rsa/RsaEncryptedBytes.scala  |   9 +-
 18 files changed, 46 insertions(+), 499 deletions(-)
 delete mode 100644 modules/core/src/main/scala/gs/crypto/v0/Base64Decoder.scala
 delete mode 100644 modules/core/src/main/scala/gs/crypto/v0/Base64Encoder.scala
 delete mode 100644 modules/core/src/main/scala/gs/crypto/v0/Decoder.scala
 delete mode 100644 modules/core/src/main/scala/gs/crypto/v0/Encode.scala
 delete mode 100644 modules/core/src/main/scala/gs/crypto/v0/Encoded.scala
 delete mode 100644 modules/core/src/main/scala/gs/crypto/v0/Encoder.scala
 delete mode 100644 modules/core/src/main/scala/gs/crypto/v0/HexDecoder.scala
 delete mode 100644 modules/core/src/main/scala/gs/crypto/v0/HexEncoder.scala
 delete mode 100644 modules/core/src/main/scala/gs/crypto/v0/RandomByteProvider.scala

diff --git a/build.sbt b/build.sbt
index fd1fa03..f7313fc 100644
--- a/build.sbt
+++ b/build.sbt
@@ -33,6 +33,13 @@ val Deps = new {
   }
 
   val Gs = new {
+    val Std = new {
+      val Version: String = "0.1.2"
+
+      val Core: ModuleID   = "gs" %% "gs-std-core-v0"   % Version
+      val IO: ModuleID     = "gs" %% "gs-std-io-v0"     % Version
+      val Effect: ModuleID = "gs" %% "gs-std-effect-v0" % Version
+    }
     val Datagen: ModuleID = "gs" %% "gs-datagen-core-v0" % "0.4.1"
   }
 
@@ -66,6 +73,9 @@ lazy val core = project
   )
   .settings(
     libraryDependencies ++= Seq(
+      Deps.Gs.Std.Core,
+      Deps.Gs.Std.IO,
+      Deps.Gs.Std.Effect,
       Deps.Cats.Effect,
       Deps.BouncyCastle.PKIX
     )
diff --git a/modules/argon2/src/main/scala/gs/crypto/v0/argon2/Argon2.scala b/modules/argon2/src/main/scala/gs/crypto/v0/argon2/Argon2.scala
index a976306..b4ce420 100644
--- a/modules/argon2/src/main/scala/gs/crypto/v0/argon2/Argon2.scala
+++ b/modules/argon2/src/main/scala/gs/crypto/v0/argon2/Argon2.scala
@@ -2,7 +2,7 @@ package gs.crypto.v0.argon2
 
 import cats.effect.Sync
 import cats.syntax.all.*
-import gs.crypto.v0.RandomByteProvider
+import gs.std.v0.effect.Rng
 import java.nio.charset.Charset
 import java.nio.charset.StandardCharsets
 import org.bouncycastle.crypto.generators.Argon2BytesGenerator
@@ -20,7 +20,7 @@ import org.bouncycastle.crypto.params.Argon2Parameters
 final class Argon2[F[_]: Sync](
   val config: Argon2.Config,
   val secret: Argon2Secret,
-  val randomByteProvider: RandomByteProvider[F]
+  val rng: Rng[F]
 ):
 
   /** Calculate a new hash for some input.
@@ -82,7 +82,7 @@ final class Argon2[F[_]: Sync](
     }
 
   private def randomSalt(): F[Array[Byte]] =
-    randomByteProvider.generateBytes(config.saltLengthInBytes)
+    rng.nextByteArray(config.saltLengthInBytes)
 
   private def buildAlgorithmParams(salt: Array[Byte]): Argon2Parameters =
     new Argon2Parameters.Builder(config.algorithmType)
diff --git a/modules/argon2/src/main/scala/gs/crypto/v0/argon2/Argon2Hash.scala b/modules/argon2/src/main/scala/gs/crypto/v0/argon2/Argon2Hash.scala
index 322cda7..c14c505 100644
--- a/modules/argon2/src/main/scala/gs/crypto/v0/argon2/Argon2Hash.scala
+++ b/modules/argon2/src/main/scala/gs/crypto/v0/argon2/Argon2Hash.scala
@@ -1,7 +1,7 @@
 package gs.crypto.v0.argon2
 
-import gs.crypto.v0.B64
-import gs.crypto.v0.Base64Encoder
+import gs.std.v0.core.B64
+import gs.std.v0.core.Base64Encoder
 import java.util.Base64
 import java.util.Objects
 import scala.util.Try
diff --git a/modules/argon2/src/main/scala/gs/crypto/v0/argon2/Argon2Secret.scala b/modules/argon2/src/main/scala/gs/crypto/v0/argon2/Argon2Secret.scala
index 1df546d..e967486 100644
--- a/modules/argon2/src/main/scala/gs/crypto/v0/argon2/Argon2Secret.scala
+++ b/modules/argon2/src/main/scala/gs/crypto/v0/argon2/Argon2Secret.scala
@@ -3,7 +3,7 @@ package gs.crypto.v0.argon2
 import cats.Applicative
 import cats.effect.Sync
 import cats.syntax.all.*
-import gs.crypto.v0.RandomByteProvider
+import gs.std.v0.effect.Rng
 import java.nio.charset.StandardCharsets
 import java.nio.file.Files
 import java.nio.file.Path
@@ -101,8 +101,8 @@ object Argon2Secret:
     */
   def generate[F[_]: Applicative](
     size: Int,
-    randomByteProvider: RandomByteProvider[F]
+    rng: Rng[F]
   ): F[Argon2Secret] =
-    randomByteProvider.generateBytes(size).map(new Argon2Secret(_))
+    rng.nextByteArray(size).map(new Argon2Secret(_))
 
 end Argon2Secret
diff --git a/modules/argon2/src/test/scala/gs/crypto/v0/argon2/Argon2Tests.scala b/modules/argon2/src/test/scala/gs/crypto/v0/argon2/Argon2Tests.scala
index 8bcbb5f..5e3ed76 100644
--- a/modules/argon2/src/test/scala/gs/crypto/v0/argon2/Argon2Tests.scala
+++ b/modules/argon2/src/test/scala/gs/crypto/v0/argon2/Argon2Tests.scala
@@ -2,7 +2,7 @@ package gs.crypto.v0.argon2
 
 import cats.effect.IO
 import cats.effect.unsafe.IORuntime
-import gs.crypto.v0.RandomByteProvider
+import gs.std.v0.effect.Rng
 import munit.Location
 import org.bouncycastle.crypto.params.Argon2Parameters
 
@@ -19,7 +19,7 @@ class Argon2Tests extends munit.FunSuite:
   ): Unit =
     test(name)(f.unsafeRunSync())
 
-  val rng: RandomByteProvider[IO] = RandomByteProvider.secureRandom[IO]
+  val rng: Rng[IO] = Rng.secure[IO]
 
   val altConfig: Argon2.Config = Argon2.Config(
     algorithmVersion = Argon2Parameters.ARGON2_VERSION_10,
diff --git a/modules/core/src/main/scala/gs/crypto/v0/Base64Decoder.scala b/modules/core/src/main/scala/gs/crypto/v0/Base64Decoder.scala
deleted file mode 100644
index 271c6ff..0000000
--- a/modules/core/src/main/scala/gs/crypto/v0/Base64Decoder.scala
+++ /dev/null
@@ -1,36 +0,0 @@
-package gs.crypto.v0
-
-import java.{util => ju}
-
-/** Implementation of [[Decoder]] for Base64 strings.
-  *
-  * Supports base64-url decoding as well.
-  */
-object Base64Decoder extends Decoder[B64]:
-  private lazy val d: ju.Base64.Decoder  = ju.Base64.getDecoder()
-  private lazy val du: ju.Base64.Decoder = ju.Base64.getUrlDecoder()
-
-  /** @inheritDocs
-    */
-  override def decode(input: B64): Array[Byte] =
-    d.decode(input.data)
-
-  /** Decode some arbitrary string data.
-    *
-    * @param input
-    *   The data to decode.
-    * @return
-    *   The decoded bytes.
-    */
-  def decodeUnsafe(input: String): Array[Byte] =
-    d.decode(input)
-
-  /** Decode the base64-url encoded input.
-    *
-    * @param input
-    *   The base64-url encoded data.
-    * @return
-    *   The decoded bytes.
-    */
-  def decodeUrl(input: B64Url): Array[Byte] =
-    du.decode(input.data)
diff --git a/modules/core/src/main/scala/gs/crypto/v0/Base64Encoder.scala b/modules/core/src/main/scala/gs/crypto/v0/Base64Encoder.scala
deleted file mode 100644
index 24bcaf3..0000000
--- a/modules/core/src/main/scala/gs/crypto/v0/Base64Encoder.scala
+++ /dev/null
@@ -1,51 +0,0 @@
-package gs.crypto.v0
-
-import java.nio.charset.Charset
-import java.nio.charset.StandardCharsets
-import java.util.Base64
-
-/** Implementation of [[Encoder]] for Base64.
-  *
-  * Supports base64-url encoding as well.
-  */
-object Base64Encoder extends Encoder[B64]:
-  private lazy val e: Base64.Encoder  = Base64.getEncoder()
-  private lazy val eu: Base64.Encoder = Base64.getUrlEncoder()
-
-  /** @inheritDocs
-    */
-  override def encode(input: Array[Byte]): B64 =
-    B64(e.encodeToString(input))
-
-  /** @inheritDocs
-    */
-  override def encode(
-    input: String,
-    charset: Charset = StandardCharsets.UTF_8
-  ): B64 =
-    encode(input.getBytes(charset))
-
-  /** Encode the given bytes using base64-url.
-    *
-    * @param input
-    *   The input data.
-    * @return
-    *   The base64-url-encoded string.
-    */
-  def encodeUrl(input: Array[Byte]): B64Url =
-    B64Url(eu.encodeToString(input))
-
-  /** Encode the given bytes using base64-url.
-    *
-    * @param input
-    *   The input data.
-    * @param charset
-    *   The character set of the input data.
-    * @return
-    *   The base64-url-encoded string.
-    */
-  def encodeUrl(
-    input: String,
-    charset: Charset = StandardCharsets.UTF_8
-  ): B64Url =
-    encodeUrl(input.getBytes(charset))
diff --git a/modules/core/src/main/scala/gs/crypto/v0/BaseKeyLoader.scala b/modules/core/src/main/scala/gs/crypto/v0/BaseKeyLoader.scala
index f8a8afa..abf6ee5 100644
--- a/modules/core/src/main/scala/gs/crypto/v0/BaseKeyLoader.scala
+++ b/modules/core/src/main/scala/gs/crypto/v0/BaseKeyLoader.scala
@@ -2,6 +2,9 @@ package gs.crypto.v0
 
 import cats.effect.Sync
 import cats.syntax.all.*
+import gs.std.v0.core.B64
+import gs.std.v0.core.Base64Decoder
+import gs.std.v0.core.Decoder
 import java.security.PrivateKey
 import java.security.PublicKey
 
@@ -39,7 +42,8 @@ abstract class BaseKeyLoader[F[_]: Sync] extends KeyLoader[F]:
   protected def prepareKey(base: String): Either[KeyLoadError, Array[Byte]] =
     scala.util
       .Try {
-        config.decoder.decode(trim(collapse(unwrap(base))))
+        val staged = trim(collapse(unwrap(base)))
+        config.decoder.decode(B64(staged))
       }
       .toEither
       .left
@@ -79,7 +83,7 @@ object BaseKeyLoader:
     shouldCollapse: Boolean,
     shouldTrim: Boolean,
     encodingName: String,
-    decoder: Decoder[String]
+    decoder: Decoder[B64]
   )
 
   /** Default configuration values that work in most cases.
@@ -114,7 +118,7 @@ object BaseKeyLoader:
       shouldCollapse = ShouldCollapse,
       shouldTrim = ShouldTrim,
       encodingName = EncodingName,
-      decoder = s => Base64Decoder.decodeUnsafe(s)
+      decoder = s => Base64Decoder.decode(s)
     )
 
   end Defaults
diff --git a/modules/core/src/main/scala/gs/crypto/v0/Decoder.scala b/modules/core/src/main/scala/gs/crypto/v0/Decoder.scala
deleted file mode 100644
index c56b944..0000000
--- a/modules/core/src/main/scala/gs/crypto/v0/Decoder.scala
+++ /dev/null
@@ -1,4 +0,0 @@
-package gs.crypto.v0
-
-trait Decoder[A]:
-  def decode(input: A): Array[Byte]
diff --git a/modules/core/src/main/scala/gs/crypto/v0/Encode.scala b/modules/core/src/main/scala/gs/crypto/v0/Encode.scala
deleted file mode 100644
index a630c9e..0000000
--- a/modules/core/src/main/scala/gs/crypto/v0/Encode.scala
+++ /dev/null
@@ -1,58 +0,0 @@
-package gs.crypto.v0
-
-import java.nio.charset.Charset
-import java.nio.charset.StandardCharsets
-
-/** Helper functions for encoding data.
-  */
-object Encode:
-
-  /** Encode an array of bytes using base64.
-    *
-    * @param input
-    *   The bytes to encode.
-    * @return
-    *   The base64 string.
-    */
-  def base64(input: Array[Byte]): B64 = Base64Encoder.encode(input)
-
-  /** Encode a string using base64.
-    *
-    * @param input
-    *   The string to encode.
-    * @param charset
-    *   The character set of the input string.
-    * @return
-    *   The base64 string.
-    */
-  def base64(
-    input: String,
-    charset: Charset = StandardCharsets.UTF_8
-  ): B64 =
-    Base64Encoder.encode(input, charset)
-
-  /** Encode an array of bytes using hexadecimal.
-    *
-    * @param input
-    *   The bytes to encode.
-    * @return
-    *   The hexadecimal string.
-    */
-  def hex(input: Array[Byte]): Hex = HexEncoder.encode(input)
-
-  /** Encode a string using hexadecimal.
-    *
-    * @param input
-    *   The string to encode.
-    * @param charset
-    *   The character set of the input string.
-    * @return
-    *   The hexadecimal string.
-    */
-  def hex(
-    input: String,
-    charset: Charset = StandardCharsets.UTF_8
-  ): Hex =
-    HexEncoder.encode(input, charset)
-
-end Encode
diff --git a/modules/core/src/main/scala/gs/crypto/v0/Encoded.scala b/modules/core/src/main/scala/gs/crypto/v0/Encoded.scala
deleted file mode 100644
index 98c615d..0000000
--- a/modules/core/src/main/scala/gs/crypto/v0/Encoded.scala
+++ /dev/null
@@ -1,159 +0,0 @@
-package gs.crypto.v0
-
-/** Represents encoded data.
-  *
-  * See:
-  *   - [[B64]]
-  *   - [[Hex]]
-  */
-trait Encoded:
-  /** @return
-    *   The encoded data (expressed as a string).
-    */
-  def data: String
-
-  /** @return
-    *   Decode the data to a byte array.
-    */
-  def decode(): Array[Byte]
-
-  /** Represents Base64-encoded data.
-    *
-    * @param data
-    *   The encoded data.
-    */
-
-/** Represents Base64-encoded data.
-  *
-  * @param data
-  *   The encoded data.
-  */
-final class B64(
-  val data: String
-) extends Encoded:
-  /** @inheritDocs
-    */
-  def decode(): Array[Byte] = Base64Decoder.decode(this)
-
-  /** @inheritDocs
-    */
-  override def equals(obj: Any): Boolean =
-    obj match
-      case other: B64 => data == other.data
-
-  /** @inheritDocs
-    */
-  override def hashCode(): Int = data.hashCode()
-
-  /** @inheritDocs
-    */
-  override def toString(): String = data
-
-object B64:
-
-  /** Instantiate [[B64]] from the given string.
-    *
-    * This function does NOT validate the input.
-    *
-    * @param data
-    *   The encoded data.
-    * @return
-    *   The new [[B64]] instance.
-    */
-  def apply(
-    data: String
-  ): B64 = new B64(data)
-
-  given CanEqual[B64, B64] = CanEqual.derived
-
-end B64
-
-/** Represents Base64-url-encoded data.
-  *
-  * @param data
-  *   The encoded data.
-  */
-final class B64Url(
-  val data: String
-) extends Encoded:
-  /** @inheritDocs
-    */
-  def decode(): Array[Byte] = Base64Decoder.decodeUrl(this)
-
-  /** @inheritDocs
-    */
-  override def equals(obj: Any): Boolean =
-    obj match
-      case other: B64Url => data == other.data
-
-  /** @inheritDocs
-    */
-  override def hashCode(): Int = data.hashCode()
-
-  /** @inheritDocs
-    */
-  override def toString(): String = data
-
-object B64Url:
-
-  /** Instantiate [[B64Url]] from the given string.
-    *
-    * This function does NOT validate the input.
-    *
-    * @param data
-    *   The encoded data.
-    * @return
-    *   The new [[B64Url]] instance.
-    */
-  def apply(
-    data: String
-  ): B64Url = new B64Url(data)
-
-  given CanEqual[B64Url, B64Url] = CanEqual.derived
-
-end B64Url
-
-/** Represents Hex-encoded data.
-  *
-  * @param data
-  *   The encoded data.
-  */
-final class Hex(
-  val data: String
-) extends Encoded:
-  /** @inheritDocs
-    */
-  def decode(): Array[Byte] = HexDecoder.decode(this)
-
-  /** @inheritDocs
-    */
-  override def equals(obj: Any): Boolean =
-    obj match
-      case other: Hex => data == other.data
-
-  /** @inheritDocs
-    */
-  override def hashCode(): Int = data.hashCode()
-
-  /** @inheritDocs
-    */
-  override def toString(): String = data
-
-object Hex:
-
-  /** Instantiate [[Hex]] from the given string.
-    *
-    * This function does NOT validate the input.
-    *
-    * @param data
-    *   The encoded data.
-    * @return
-    *   The new [[Hex]] instance.
-    */
-  def apply(
-    data: String
-  ): Hex = new Hex(data)
-
-  given CanEqual[Hex, Hex] = CanEqual.derived
-
-end Hex
diff --git a/modules/core/src/main/scala/gs/crypto/v0/Encoder.scala b/modules/core/src/main/scala/gs/crypto/v0/Encoder.scala
deleted file mode 100644
index 8e09a0e..0000000
--- a/modules/core/src/main/scala/gs/crypto/v0/Encoder.scala
+++ /dev/null
@@ -1,44 +0,0 @@
-package gs.crypto.v0
-
-import java.nio.charset.Charset
-import java.nio.charset.StandardCharsets
-
-/** Interface for byte encoding to String formats.
-  */
-trait Encoder[+A <: Encoded]:
-  /** Encode an array of bytes.
-    *
-    * @param input
-    *   The bytes to encode.
-    * @return
-    *   The encoded string.
-    */
-  def encode(input: Array[Byte]): A
-
-  /** Encode a string.
-    *
-    * @param input
-    *   The string to encode.
-    * @param charset
-    *   The character set of the input string.
-    * @return
-    *   The encoded string.
-    */
-  def encode(
-    input: String,
-    charset: Charset = StandardCharsets.UTF_8
-  ): A
-
-object Encoder:
-
-  /** @return
-    *   The [[Base64Encoder]], typed to `Encoder[Encoded]`.
-    */
-  def base64(): Encoder[Encoded] = Base64Encoder
-
-  /** @return
-    *   The [[HexEncoder]], typed to `Encoder[Encoded]`.
-    */
-  def hex(): Encoder[Encoded] = HexEncoder
-
-end Encoder
diff --git a/modules/core/src/main/scala/gs/crypto/v0/HexDecoder.scala b/modules/core/src/main/scala/gs/crypto/v0/HexDecoder.scala
deleted file mode 100644
index f8dd1a5..0000000
--- a/modules/core/src/main/scala/gs/crypto/v0/HexDecoder.scala
+++ /dev/null
@@ -1,23 +0,0 @@
-package gs.crypto.v0
-
-import java.util.HexFormat
-
-/** Implementation of [[Decoder]] for Hexadecimal strings.
-  */
-object HexDecoder extends Decoder[Hex]:
-  private lazy val h: HexFormat = HexFormat.of()
-
-  /** @inheritDocs
-    */
-  override def decode(input: Hex): Array[Byte] =
-    h.parseHex(input.data)
-
-  /** Decode some arbitrary string data.
-    *
-    * @param input
-    *   The data to decode.
-    * @return
-    *   The decoded bytes.
-    */
-  def decodeUnsafe(input: String): Array[Byte] =
-    h.parseHex(input)
diff --git a/modules/core/src/main/scala/gs/crypto/v0/HexEncoder.scala b/modules/core/src/main/scala/gs/crypto/v0/HexEncoder.scala
deleted file mode 100644
index 4f48226..0000000
--- a/modules/core/src/main/scala/gs/crypto/v0/HexEncoder.scala
+++ /dev/null
@@ -1,23 +0,0 @@
-package gs.crypto.v0
-
-import java.nio.charset.Charset
-import java.nio.charset.StandardCharsets
-import java.util.HexFormat
-
-/** Implementation of [[Encoder]] for Hexadecimal strings.
-  */
-object HexEncoder extends Encoder[Hex]:
-  private lazy val h: HexFormat = HexFormat.of()
-
-  /** @inheritDocs
-    */
-  override def encode(input: Array[Byte]): Hex =
-    Hex(h.formatHex(input))
-
-  /** @inheritDocs
-    */
-  override def encode(
-    input: String,
-    charset: Charset = StandardCharsets.UTF_8
-  ): Hex =
-    encode(input.getBytes(charset))
diff --git a/modules/core/src/main/scala/gs/crypto/v0/RandomByteProvider.scala b/modules/core/src/main/scala/gs/crypto/v0/RandomByteProvider.scala
deleted file mode 100644
index 9901cdb..0000000
--- a/modules/core/src/main/scala/gs/crypto/v0/RandomByteProvider.scala
+++ /dev/null
@@ -1,77 +0,0 @@
-package gs.crypto.v0
-
-import cats.Applicative
-import cats.effect.Sync
-import java.security.SecureRandom
-
-/** Utility which produces random bytes. Used for cryptographic support.
-  */
-trait RandomByteProvider[F[_]]:
-  /** Generate the specified number of random bytes.
-    *
-    * @param numberOfBytes
-    *   The number of bytes to generate.
-    * @return
-    *   New array with the specified number of random bytes.
-    */
-  def generateBytes(numberOfBytes: Int): F[Array[Byte]]
-
-object RandomByteProvider:
-
-  /** Default random number generator.
-    */
-  lazy val RNG: SecureRandom = new SecureRandom
-
-  /** New [[RandomByteProvider]] that uses the default (secure) random number
-    * generator to produce bytes.
-    *
-    * @return
-    *   The new provider instance.
-    */
-  def secureRandom[F[_]: Sync]: RandomByteProvider[F] =
-    new SecureRandomProvider[F](RNG)
-
-  /** New [[RandomByteProvider]] that uses the given `SecureRandom` instance to
-    * produce bytes.
-    *
-    * @param random
-    *   The `SecureRandom` instance.
-    * @return
-    *   The new provider.
-    */
-  def secureRandom[F[_]: Sync](random: SecureRandom): RandomByteProvider[F] =
-    new SecureRandomProvider[F](random)
-
-  /** @return
-    *   New [[RandomByteProvider]] that returns an array of the null byte.
-    */
-  def zero[F[_]: Applicative]: RandomByteProvider[F] =
-    new Zero[F]
-
-  /** Implementation of [[RandomByteProvider]] that uses `SecureRandom`.
-    *
-    * @param random
-    *   The random number generator.
-    */
-  final class SecureRandomProvider[F[_]: Sync](
-    val random: SecureRandom
-  ) extends RandomByteProvider[F]:
-
-    /** @inheritDocs
-      */
-    override def generateBytes(numberOfBytes: Int): F[Array[Byte]] =
-      Sync[F].delay {
-        val b = new Array[Byte](numberOfBytes)
-        random.nextBytes(b)
-        b
-      }
-
-  /** Implementation of [[RandomByteProvider]] that always returns an array of
-    * the null byte.
-    */
-  final class Zero[F[_]: Applicative] extends RandomByteProvider[F]:
-
-    override def generateBytes(numberOfBytes: Int): F[Array[Byte]] =
-      Applicative[F].pure(Array.fill(numberOfBytes)(0))
-
-end RandomByteProvider
diff --git a/modules/core/src/main/scala/gs/crypto/v0/Signature.scala b/modules/core/src/main/scala/gs/crypto/v0/Signature.scala
index dfb4b58..52450d7 100644
--- a/modules/core/src/main/scala/gs/crypto/v0/Signature.scala
+++ b/modules/core/src/main/scala/gs/crypto/v0/Signature.scala
@@ -1,5 +1,12 @@
 package gs.crypto.v0
 
+import gs.std.v0.core.B64
+import gs.std.v0.core.B64Url
+import gs.std.v0.core.Base64Encoder
+import gs.std.v0.core.EncodedString
+import gs.std.v0.core.Hex
+import gs.std.v0.core.HexEncoder
+
 /** Represents a cryptographic signature. Opaque type for an array of bytes.
   */
 opaque type Signature = Array[Byte]
@@ -22,7 +29,7 @@ object Signature:
     * @return
     *   The new signature.
     */
-  def fromEncoded(value: Encoded): Signature =
+  def fromEncodedString(value: EncodedString): Signature =
     value.decode()
 
   given CanEqual[Signature, Signature] = CanEqual.derived
diff --git a/modules/rsa/src/main/scala/gs/crypto/v0/rsa/Rsa.scala b/modules/rsa/src/main/scala/gs/crypto/v0/rsa/Rsa.scala
index 2ea1f6e..695d3ff 100644
--- a/modules/rsa/src/main/scala/gs/crypto/v0/rsa/Rsa.scala
+++ b/modules/rsa/src/main/scala/gs/crypto/v0/rsa/Rsa.scala
@@ -3,9 +3,9 @@ package gs.crypto.v0.rsa
 import cats.effect.Sync
 import cats.effect.kernel.Resource
 import cats.syntax.all.*
-import gs.crypto.v0.Base64Decoder
+import gs.std.v0.core.Base64Decoder
+import gs.std.v0.io.Files
 import java.nio.charset.StandardCharsets
-import java.nio.file.Files
 import java.nio.file.Path
 import java.security.KeyFactory
 import java.security.PrivateKey
@@ -116,8 +116,8 @@ object Rsa:
   def loadPublicKeyFromFile[F[_]: Sync](
     publicKeyPath: Path
   ): F[PublicKey] =
-    Sync[F]
-      .delay(Files.readString(publicKeyPath, StandardCharsets.UTF_8))
+    Files
+      .readFileAsString(publicKeyPath, StandardCharsets.UTF_8)
       .map(preparePublicKey)
       .flatMap(loadPublicKey[F])
 
@@ -144,8 +144,8 @@ object Rsa:
   def loadPrivateKeyFromFile[F[_]: Sync](
     privateKeyPath: Path
   ): F[PrivateKey] =
-    Sync[F]
-      .delay(Files.readString(privateKeyPath, StandardCharsets.UTF_8))
+    Files
+      .readFileAsString(privateKeyPath, StandardCharsets.UTF_8)
       .map(preparePrivateKey)
       .flatMap(loadPrivateKey[F])
 
diff --git a/modules/rsa/src/main/scala/gs/crypto/v0/rsa/RsaEncryptedBytes.scala b/modules/rsa/src/main/scala/gs/crypto/v0/rsa/RsaEncryptedBytes.scala
index 890c0d4..9f75c2d 100644
--- a/modules/rsa/src/main/scala/gs/crypto/v0/rsa/RsaEncryptedBytes.scala
+++ b/modules/rsa/src/main/scala/gs/crypto/v0/rsa/RsaEncryptedBytes.scala
@@ -1,7 +1,7 @@
 package gs.crypto.v0.rsa
 
-import gs.crypto.v0.Encoded
-import gs.crypto.v0.Encoder
+import gs.std.v0.core.EncodedString
+import gs.std.v0.core.Encoder
 
 /** Represents arbitrary bytes that were encrypted using RSA.
   *
@@ -15,7 +15,8 @@ import gs.crypto.v0.Encoder
   */
 final class RsaEncryptedBytes(val bytes: Array[Byte]):
 
-  def encode(encoder: Encoder[Encoded] = Encoder.base64()): Encoded =
+  def encode(encoder: Encoder[EncodedString] = Encoder.base64())
+    : EncodedString =
     encoder.encode(bytes)
 
   /** @inheritDocs
@@ -39,7 +40,7 @@ object RsaEncryptedBytes:
     * @return
     *   The new [[RsaEncryptedBytes]].
     */
-  def decode(value: Encoded): RsaEncryptedBytes =
+  def decode(value: EncodedString): RsaEncryptedBytes =
     new RsaEncryptedBytes(value.decode())
 
 end RsaEncryptedBytes