cjsmith-0141 / fs2-pgp

fs2 pipes for encrypting and decrypting data using BouncyCastle's PGP implementation

fs2-pgp

A library for encrypting and decrypting fs2 Stream[F, Byte] using PGP.

Artifact	Description	Cats Effect Version	fs2 Version	Scala 2.12	Scala 2.13
"fs2-pgp"	Load PGP keys and use them to encrypt, decrypt, and armor byte streams.	Cats Effect 3	fs2 3.x	✅	✅
"pgp-testkit"	ScalaCheck Generators and Arbitrary instances for PGP classes	Cats Effect 3	fs2 3.x	✅	✅

Bouncy Castle Versions

Bouncy Castle often releases versions that report as binary-incompatible with previous versions when examined with a tool such as MiMa. The "current" version of the artifacts published by this project intend to track the latest Bouncy Castle version, with previously supported versions published as supplemental artifacts with the supported Bouncy Castle version appended to the artifact name.

For example, the latest Bouncy Castle version is 1.77, so the latest version of com.dwolla::fs2-pgp depends on org.bouncycastle:bcpg-jdk18on:1.77. In addition, we publish artifacts named like com.dwolla::fs2-pgp-bcpg1.76 for each of the previously supported Bouncy Castle artifacts.

Keys

import com.dwolla.security.crypto._
import cats.effect._

val key =
  """-----BEGIN PGP PUBLIC KEY BLOCK-----
    |Version: GnuPG v1
    |
    |mQENBFVoyeYBCACy0S/9y/c/CpoYLL6aD3TMCV1Pe/0jcWN0ykULf9l4znYODZLr
    |f10BGAJETj9ghrJCNXMib2ogz0wo43KVAp9o3mkg01vVyqs1rzM5jw+yCZmyGPFf
    |GsE2lxZFMX+rS0dyq2w0FQN2IjYsELwIFeQ02GXTLyTlhY+u5wwCXo4e7AEXaEo7
    |jl8129NA46gf6l+6lUMyFpKnunO7L4W5rCCrIizP4Fmll1adYfClSX6cztIfz4vg
    |Fs2HuViPin5y8THodkg9cIkCfyNHivEbfBbx0xfx67BCwxFcYgF/84H8TASRhjRl
    |4s1fZDA7rETWDJIcC+neNV/qtF0kY1ECSd3nABEBAAG0IFRlc3QgVXNlciA8ZnJl
    |ZCt0ZXN0QGR3b2xsYS5jb20+iQE4BBMBAgAiBQJVaMnmAhsDBgsJCAcDAgYVCAIJ
    |CgsEFgIDAQIeAQIXgAAKCRA2OYfNakCqV1bYB/9QNR5DN5J27Z4DIGoOto/PuVvs
    |bQHZj8NLcvIZL1cUyKOg+oRICq2z4BXHAMqyouhs/GLiR5P74I9cJTSIudAvBhwi
    |du9AcMQy+Qg3K1rUQGlNU+iamD8DFNUhLoK+Oicij0Mw4TSWBsoR3+Pg/jZ5SDUc
    |dUsGGaBJthYoiJR8vZ6Uf9oCn+mpVhrso0zemBDud4AHKaVa+8o7VUWGa6jeyRHX
    |RKVbHn7GGYiHZkl+qfpthcxyPHOIkZo+t8GVTItLpvVuU+X36N70+rIzXj5t8NDZ
    |KfD3M4p6BSq6Cu6DtJOZ1F28hwaWiRoCdbPrJfW33fo1RxLB6+nLf/ttYGmhuQEN
    |BFVoyeYBCADiZfKA98YQip/kvj5rBS2ilQDycBX7Ls2IftuwzO6Q9QSF2lDiz708
    |zyvg0czQPZYaZkFgziZEmjbvOc7hDG+icVWRLCjCcZk4i2TXy7bGcTZmBQ31iVMJ
    |ia7GxsJhu4ngrP15pZakAYcCwEk3QH17TdhOwvV8ixHmv9USCMJyiNnuhVAP2tY/
    |Ef0EoCV6qAMoP3dNPT30sFI8+55Ce9yAtWQItT5q4vYOmC9Q34XtSxvpLsLzVByd
    |rdvgXe0acjvMiTGcYBdjitawFYeLuz2s5mQAi4X1vcJqxBSBjG7X+1PiDqFFIid3
    |+6rIQtR3ho+Xqz/ucGglKxtn6m49wMHJABEBAAGJAR8EGAECAAkFAlVoyeYCGwwA
    |CgkQNjmHzWpAqldxFgf/SZIT1AiBAOLkqdWEObg0cU7n1YOXbj56sUeUCFxdbnl9
    |V2paf2SaMB6EEGLTk9PN0GG3hPyDkl4O6w3mn2J46uP8ecVaNvTSxoq2OmkMmD1H
    |/OSnF8a/jB6R1ODiAwekVuUMtAS7JiaAAcKcenG1f0XRKwQs52uavGXPgUuJbVtK
    |bB0SyLBhvGG8YIWTXRMHoJRt/Ls4JEuYaoBYqfV2eDn4WhW1LVuXP13gXixy0RiV
    |8rHs9aH8BAU7Dy0BBnaS3R9m8vtfdFxMI3/+1iGt0+xh/B4w++9oFE2DgyoZXUF8
    |mbjKYhiRPKNoj6Rn/mHUGcnuPlKvKP+1X5bObpDbQQ==
    |=TJUS
    |-----END PGP PUBLIC KEY BLOCK-----""".stripMargin

PGPKeyAlg[IO].readPublicKey(key).unsafeRunSync()
val res0: org.bouncycastle.openpgp.PGPPublicKey = org.bouncycastle.openpgp.PGPPublicKey@1003b416

Encryption

Read a PGPPublicKey using PGPKeyAlg[F], then pipe your message bytes through CryptoAlg[F].encrypt.

import cats.effect._
import cats.syntax.all._
import org.typelevel.log4cats.Logger
import fs2._
import fs2.text._
import com.dwolla.security.crypto._
import org.bouncycastle.openpgp._

val key: PGPPublicKey = ??? // from above

(for {
  crypto <- Stream.resource(CryptoAlg[IO])
  output <- Stream.emit("hello world")
                  .through(utf8.encode)
                  .through(crypto.encrypt(key))
                  .through(crypto.armor())
                  .through(utf8.decode)
} yield output).compile.string.unsafeRunSync()
val res1: String =
"-----BEGIN PGP MESSAGE-----
Version: BCPG v1.66

hQEMAzY5h81qQKpXAQf/YTq6GtTkWlbg2DRu7r133FZaAudA149WB2BV/vsgyHkN
…
"

Decryption

Read a PGPPrivateKey using PGPKeyAlg[F], then pipe the encrypted message bytes through CryptoAlg[F].decrypt.