[openpgpjs] CFB decrypt: invalid key - decryption message encrypted on server side

[Sergiusz Kierat]

Hi.

I am trying to decrypt message which was encrypted by bouncycastle openpgp.
I have an encryption method on server side [1]

It produces for plain message i.e. "1234" something like this:


-----BEGIN PGP MESSAGE-----
Version: BCPG v1.51
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=uxmv
-----END PGP MESSAGE-----


I am struggling with decryption that PGP MESSAGE, cause I get 'CFB decrypt:
invalid key'.
Currently, I have no idea where is the issue.

Any ideas?

S.

[1]
  def encryptStringAsPGP(keyRing:
org.bouncycastle.openpgp.PGPSecretKeyRing, input: String): String = {
    val cbOut: ByteArrayOutputStream = new ByteArrayOutputStream
    val cPk: PGPEncryptedDataGenerator = new PGPEncryptedDataGenerator(new
JcePGPDataEncryptorBuilder(SymmetricKeyAlgorithmTags.AES_256)
      .setSecureRandom(DefaultSecureRandom)
      .setWithIntegrityPacket(true)

.setProvider(org.bouncycastle.jce.provider.BouncyCastleProvider.PROVIDER_NAME))
    val puK: PGPPublicKey = keyRing.getPublicKey
    cPk.addMethod(new
JcePublicKeyKeyEncryptionMethodGenerator(puK).setProvider(BouncyCastleProvider.PROVIDER_NAME))
    val cOut: OutputStream = cPk.open(new UncloseableOutputStream(cbOut),
input.length)
    cOut.write(input.getBytes)

    var bOut: ByteArrayOutputStream = new ByteArrayOutputStream
    var aOut: ArmoredOutputStream = new ArmoredOutputStream(bOut)

    bOut = new ByteArrayOutputStream
    aOut = new ArmoredOutputStream(bOut)

    aOut.write(cbOut.toByteArray)
    aOut.close
    bOut.close
    cOut.close
    bOut.toString
  }

where DefaultSecureRandom = new SP800SecureRandomBuilder()
    .setEntropyBitsRequired(DefaultSecurityStrength)

.setPersonalizationString(seedGenerator.generateSeed(DefaultSecurityStrength))
    .buildHMAC(new HMac(new SHA256Digest()),
seedGenerator.generateSeed(DefaultSecurityStrength),
UserPredictionResistance)

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