implement pgp decrypt method that mimics error behavior

[tomholub]

part of #1051 , needs to be done before doing #1057

[tomholub]

@DenBond7 already had a piece of code that he uses to decrypt files in tests, here:

  //todo-denbond7 Replace it when we will have PgpDecrypt.decryptFile()
  private fun decrypt(inputStream: ByteArrayInputStream,
                      pgpPublicKeyRingCollection: PGPPublicKeyRingCollection,
                      pgpSecretKeyRing: PGPSecretKeyRing,
                      passphrase: Passphrase): ByteArrayOutputStream {

    val protector = PasswordBasedSecretKeyRingProtector(
        KeyRingProtectionSettings.secureDefaultSettings()) { keyId ->
      pgpSecretKeyRing.publicKeys.forEach { publicKey ->
        if (publicKey.keyID == keyId) {
          return@PasswordBasedSecretKeyRingProtector passphrase
        }
      }
      return@PasswordBasedSecretKeyRingProtector null
    }

    val decryptionStream = PGPainless.decryptAndOrVerify()
        .onInputStream(inputStream)
        .decryptWith(protector, PGPSecretKeyRingCollection(listOf(pgpSecretKeyRing)))
        .verifyWith(pgpPublicKeyRingCollection)
        .ignoreMissingPublicKeys()
        .build()

    val outputStreamWithDecryptedData = ByteArrayOutputStream()
    decryptionStream.use { it.copyTo(outputStreamWithDecryptedData) }

    return outputStreamWithDecryptedData
  }

That's basically already the implementation you need, except I would like to change the return type to be closer to existing NodeJS responses which also categorize possible errors and provides an error message for the user. To be similar to original decryptFile it should contain roughly this return info:

data class DecryptResult(
  content?: ByteArrayOutputStream, // if success
  isEncrypted: Bool, // true if message was encrypted. Alternatively false (because it could have also been plaintext signed, or wrapped in PGP armor as plaintext packet without encrypting,
  filename: String?, // pgp messages may include original filename in them
  signature?: null // todo later - signature verification not supported on Android yet
  error?: data class DecryptError( 
    type: DecryptErrTypes,
    message: string
  )
}

Here is some original typescript code

// error types enum
export enum DecryptErrTypes {
  keyMismatch = 'key_mismatch',
  usePassword = 'use_password',
  wrongPwd = 'wrong_password',
  noMdc = 'no_mdc',
  badMdc = 'bad_mdc',
  needPassphrase = 'need_passphrase',
  format = 'format',
  other = 'other',
}

// error enum logic (for OpenPGP.js - in case of PGPainless it will probably be throwing exceptions)
  private static cryptoMsgDecryptCategorizeErr = (decryptErr: any, msgPwd?: string): DecryptError$error => {
    const e = String(decryptErr).replace('Error: ', '').replace('Error decrypting message: ', '');
    const keyMismatchErrStrings = ['Cannot read property \'isDecrypted\' of null', 'privateKeyPacket is null',
      'TypeprivateKeyPacket is null', 'Session key decryption failed.', 'Invalid session key for decryption.'];
    if (keyMismatchErrStrings.includes(e) && !msgPwd) {
      return { type: DecryptErrTypes.keyMismatch, message: e };
    } else if (msgPwd && ['Invalid enum value.', 'CFB decrypt: invalid key', 'Session key decryption failed.'].includes(e)) {
      return { type: DecryptErrTypes.wrongPwd, message: e };
    } else if (e === 'Decryption failed due to missing MDC in combination with modern cipher.' || e === 'Decryption failed due to missing MDC.') {
      return { type: DecryptErrTypes.noMdc, message: e };
    } else if (e === 'Decryption error') {
      return { type: DecryptErrTypes.format, message: e };
    } else if (e === 'Modification detected.') {
      return { type: DecryptErrTypes.badMdc, message: `Security threat - opening this message is dangerous because it was modified in transit.` };
    } else {
      return { type: DecryptErrTypes.other, message: e };
    }
  }

[tomholub]

@DenBond7 the original return code also had the following used for diagnostics:

  longids: {
    message: List<String>, // for which longids was message encrypted
    matching: List<String>, // which of above longids match provided keys
    chosen: List<String>, // which longids were chosen for decryption (pass phrase available)
    needPassphrase: List<String> // which longids were missing pass phrase
  }

Which of these are you using on Android? Or are these currently ignored?

[tomholub]

@IvanPizhenko here is data below for a few test cases. They were taken from https://github.com/FlowCrypt/flowcrypt-browser/blob/master/test/source/tests/decrypt.ts - I'm skipping all test cases related to encoding (here we just decrypt data, don't care about parsing or decoding the result) and I'm also skipping all related to signature verification (not supported on Android).

You can extract the "message" param content for your test case (need to url decode it to be usable). These examples are armored, but please also test at least one unarmored binary file.

    ava.default(`decrypt - [security] mdc - missing - error`, testWithBrowser('compatibility', async (t, browser) => {
      await BrowserRecipe.pgpBlockVerifyDecryptedContent(t, browser, {
        content: ["Security threat!", "MDC", "Display the message at your own risk."],
        params: "?frame_id=frame_obvAUTGAJU&message=-----BEGIN%20PGP%20MESSAGE-----%0AVersion%3A%20FlowCrypt%205.5.9%20Gmail%20Encryption%20flowcrypt.com%0AComment%3A%20Seamlessly%20send%2C%20receive%20and%20search%20encrypted%20email%0A%0AwcFMA0taL%2FzmLZUBAQ%2F7Bwida5vvhXv5Zi%2BqJbG%2FQPst11jWfljDQlw1VLzF%0Aou8ofoIEHpvoFgXegZUnoQXBmlHGD%2BXLs9jG%2FTV1mtE2RWq4hDtqiTQ6rEIa%0AbrN3Nx77Yr%2B4EN1aKI20aTLEPTIjVU2GH2i9DAmjHteBU3nkL9Z3yecB8Pn8%0AEdhpCRY6cj2yrhJ5MPwmXrus9OFv39wA2DqYpqW5Be%2BKD8mipZ2CtJo5xtin%0AaeEhpWSDsdg26rjx1nz4dA0NcFzZK2p%2FBPfPIFzRvmoXoWFigpUnwryEoCqX%0A%2Ftgmcrv7PqiYT5oziPmMuBc1lb7icI%2FAq69uXz2z6%2B4MJHOlcTEFygV36J%2B1%0A1opcjoX%2BJKJNn1nvHovBxuemcMwriJdmDj4Hmfo4zkd6ryUtGVrMVn8DbRp6%0ATWB%2F0MSE8cmfuiA5DgzdGbrevdL6RxnQDmalTHJ5oxurFQVoLwpmbgd36C4Q%0AxMfG1xEqFn5zvrCTGHg2OfS2cynal8CQDG0ZQCoWwdb0kT5D6bx7QKcuyy1%2F%0A1TXKnp1NamD5Uhu1%2BXuxD7EbvDYUWYh3bkqgslsoX%2BOUl%2BONdtMD5PswArd5%0AKisD9UJuddJShL4clBUPoXeNrRxrU6HqjP5T4fapK684MeizicHIRpAww7fu%0AZ8YtaySZ%2FhoOAKWsx0rV4grgJV7pryj4ARBRa1pLL9rBwUwDS1ov%2FOYtlQEB%0AD%2F47fyD%2F6BvepqWmZXj7VLl2y63eE0b%2F6hf5K%2BIzv5A%2F%2B5l%2FEnjFx0rq%2BqeX%0A6hftYZBUAbbBvKfxq9D5xsWg3tnhFv2sYIE3YpkCSzZpWJmahHwQOVNT0ASw%0AgbO25OiTPlYPqfSkGYe0palbL%2B4T5dLOwVilmrZ2bQf%2FrLePwA4RQpWDPYio%0ANDU0Xfi7TQcHQrZTpwFbVzNPXgCHnQkqF%2Bs0v8RDJHnt9vVs2KEpi49V%2FYgN%0A%2BgZnZOeADL0rbre%2FPrIck1YSjZLbrWtQVk4%2BsCf0TjvixJ7MNjA4NgdZPo0M%0AHke%2F9XBFie3NiZaW%2FcEIVZ7WnjB3IbhkmOMJd4LgdHKgmswJwCYm%2BXvpOI19%0AFzU1vzZmfOA1nEJSuuCDNVUoKYIQA5UEYJrVJeGnVN5sU5jkdlX9xPtYceww%0AYFmLisuf9Ev0HC7v27KwYQRDPNYRA8GeK%2FjY6aZdg%2BVccsnzEigdYL5Tm4JI%0AZrxp%2FG807bZvt0yZwWh0gpWOFgbVgrm4Hpji5ilDyulZSW%2B8nJxB5tDoPzL4%0Aj4w9malje0c60GWNtiyCPLURyN63C2q144UpQjSU5r66oP1yF2A97aXKbf4p%0AqO7cSNWEOTpqJkJrNFVKQdWvXZ%2BmvW1PQFmkkwish2HiQIXmWb04uV1pI8hR%0A6YWk2ox9aZiJ664MpncgyJ5uIMlzVfYrX%2BAZRtBW36RgCTprIv6l1M5NcHMy%0AzEscTaSY%2Fe%2BpM5HzQKSzX%2BzHLa5kk5L7veX%2B1G33saiqSJ%2FfK13%2Bk7qDNZQD%0Anbtaebfh2JS0Pdbub6FUFjPHR5PydU9ltuppGEeYrOe1SxwiZ6BZfIXO2%2F8M%0AhA%3D%3D%0A%3DB%2FNE%0A-----END%20PGP%20MESSAGE-----&message_id=166b194b21a0997c&senderEmail=human%40flowcrypt.com&is_outgoing=___cu_false___&account_email=flowcrypt.compatibility%40gmail.com"
      });
    }));

ava.default(`decrypt - [security] mdc - modification detected - error`, testWithBrowser('compatibility', async (t, browser) => {
      await BrowserRecipe.pgpBlockVerifyDecryptedContent(t, browser, {
        content: ["Security threat - opening this message is dangerous because it was modified in transit."],
        params: "?frame_id=frame_obvAUTGAJU&message=-----BEGIN%20PGP%20MESSAGE-----%0AVersion%3A%20FlowCrypt%205.5.9%20Gmail%20Encryption%20flowcrypt.com%0AComment%3A%20Seamlessly%20send%2C%20receive%20and%20search%20encrypted%20email%0A%0AwcFMA0taL%2FzmLZUBAQ%2F%2BKvSED2vb9fJMQd6lRTh0idC7srhg4ESSf4ggCXFE%0AdeOq2IkV5dNhgWGGawFVVUTewMh3L3JklDoONlatBthc2OGNu%2BFyu5No7hhG%0A3Jq1GkNwCqex0%2BG%2BGVhlZfN2LOAx855H9m%2FAGxYo6KLU%2BROmPZV8PZo5YJPr%0Ar8TrhhfHF%2FPG4ZmQIcuvPI1e0ivgF74wP4cG0qaPEacvSxQ1ZuDwzdqC1kGv%0AseOTJEhpBG%2FD8YfbzUXVrX4GiOzIu2OhnlKfU6c0BJCTz%2BqmQRqYOZXLvKgd%0AnU0RzfLgMsd7Sy1lCpld1syY3bT4l0FIRWUtVx1NrJ7cluicEPDiqJsEZntS%0AYy1ViiRZlnk2Xvx1Qpsh7fifUS8e9gfwPevYFhZ%2Fb6SeqpRFRDFGa0uP9L5C%0A%2FCcWqiUaLUL8nF51CYzfIMeIEGBk0TiVUAn19mkQTFbtbIB9K3uQHjFzgnrL%0AnLaJ08Eme5NugtJMUIW7bgo4CAddRjj0isFsoesUv75%2FmEsHJ7JRPICnWx4b%0ALPKOyP0anN6TYDgTC6IqvMOoNi0ZPEIpmGmf7ZOWjR4eUT%2B9uBmBHEPwGbLQ%0A85Mcjy1C7X%2B0uUkIPsqXgF7Ya%2FpwTuZ8mDtF%2FFU3kR87y3jlDZ%2B3ltq%2BY%2B5A%0ABJyMGXGf24%2BSquE1Q%2BONIzBwBqwXuYvRJwqA9vOtZ1PBwUwDS1ov%2FOYtlQEB%0AD%2F0R6LMWFQHZQCIFkvXcB5r4X3J68tcLffAIVs%2BJnoyR6JECUuCZJdKLc4Aa%0AF%2BA15GKiOnf5Z8RIg3Fn3nXuyN5rlWOu0yOO%2FXrnCSMHiYErTLUO6%2B6V6%2Bby%0Ai%2BPOAtAWptnJ7rGSAy17ZgIYD9WNPdX8Bv1fWEOJII2rj%2B5CVyBsOZWrnlnP%0AHjHOQ6gHop7bnQlrpmpA95PLhyoW1LkEIoC0jgrGF%2B0QXRqEfdwpQBCklZyL%0A%2FWAsG2GJLrHUgQALgpTys6%2F5P7VP%2BVSOaEnOJJExIZPkRVRFzWlYq1avgJWw%0AEFGmKeg335%2FiThKBFQ8JsH9U22G5DD1BcfX%2Bqtm4n640zC5pHRpLJO6ggiCJ%0AZA1SCtq6TBSF1FTa158ZNgjkiGZfS%2BoZvrMW%2BS1691vMmJrwqiRlPg9PXCA%2B%0AouGrU%2F1FVyRKGx1%2FUki%2Fh9SaxDX%2F3uHOOwJzytNxGMJP%2F4Y1Y6hbDwDzcrCM%0AFlFHXiNbfB3uxiHD9wWHE44z91MkqOb7%2FajoLXA8J8U3KJGFa%2B8JkZleRVnq%0Ar%2FUT8ppv0%2FozWzV59mTulYzRdIPSy6r4V0bH16XGwZtHVrljOi4TrkExB9cS%0ATdcX96RMMYpJ7p7dGcxoHaRBY120BD%2BsJ51jGi%2FYupoZBdbg7KcOAEelD2%2FF%0ALM1LzR9f3HUaYyKvdPL%2BC0OwINKCAZBPShfECZOiqrNWgHLWddAdXqexZFLH%0A0y7td11E7UNcCZegIlwOYksW7yuuCZ2ZLLnfx%2Fu1G18nKBCealqNkaow%2FPj7%0A4q%2B0UYxfZnAl%2FrFuTK9ndd8tWMSm%2F6xzWEbqe%2F8NKJrCwk%2Fnu%2BpvF%2BMuRvf5%0A9DuzZFiNRQSjSxSYvkyLuw%3D%3D%0A%3DvxOj%0A-----END%20PGP%20MESSAGE-----&message_id=166b194b21a0997c&senderEmail=human%40flowcrypt.com&is_outgoing=___cu_false___&account_email=flowcrypt.compatibility%40gmail.com"
      });
    }));

    ava.default(`decrypt - [everdesk] message encrypted for sub but claims encryptedFor:primary,sub`, testWithBrowser('compatibility', async (t, browser) => {
      await BrowserRecipe.pgpBlockVerifyDecryptedContent(t, browser, {
        content: ["this is a sample for FlowCrypt compatibility"],
        params: "?frame_id=frame_obvAUTGAJU&message=-----BEGIN%20PGP%20MESSAGE-----%0A%0AwcFMA62sJ5yVCTIHAQ%2F8CkcWeLmCy8lvANll0KbA9ymThNOmZjblBNRZvgT8DqaL%0AhaGXzHaMGHvi0d66P38RXfDc%2BH9l%2FjGtdS1zgiMJMpCUFtDc3OPgOuA93sReqBsq%0A7fv5a%2BLSdfFZUPgUkXM2ur0eA%2BniNE%2BG3mbDcr%2FcuILYI8xTs6xbHRIKVl2G09eS%0ABZMEyqH3duIAi0M42r4L%2FuvABTcEyVKvY%2FQHFmFTj1tSzqSD5PDv%2BnN0ihNR16R9%0AN56PMcZazvTdChhXuA3MNciKoJtbZ785c%2FdwRL8bz8rr7Wj6iF%2B3Qm6kgbkef%2Fo4%0A6D8u8G1eDfSWuwtXVqIOuokd%2FmYgNIVZwt1sJukuGv3eL76b7Mhk3lCEjE8uSOf9%0AN9mbLErel5VUTzNTVpA336aBnMKjEsJUIOg0sU0q8XAKeSjcrIuBrsaKpjq7WDXp%0AFA2eQkpHpwZnlWjVMOYRREdji3G%2Ft32ATTchNXl9zhQsioqQbfUtWkj2WvltE5oz%0AO85ddVUniqpQPdQaojZ5%2BdPZ8SBC%2F4eUp3z4J4%2Fb0fWSTPl%2FtLblFy1HJs0lKG5Z%0A8AaoCGF5TLPoygXjBk0ImikeIGlYIShVOqG36RJlMh4xOQCmY0g9nz9LdCEHJ%2BuC%0AkWh%2FoREBhSMnqlmn1ic%2FDG16h17E%2FtiOuOxsqTfIGlkLSShXDoiTjxgm527FA5HB%0AwUwDS1ov%2FOYtlQEBD%2F9f6jwJxYjdBo2pUy5c%2BgA47BtW%2Fzz12MKhRAHd%2B%2FbVbTv6%0A5JhlBw1Jow0ckjcbnDRqBP9EL%2BErAlc2UzGa%2B42Ahrc2HlDvyMJCcxLt0Fa2nhXG%0AYWGHsQbHxgbePWHozwun2RXaAvvBonhBaYtcn0QPNEtArB9uyO4YqXXoH1%2Fl0%2Fgh%0AIAzuR%2BLNymwdOBXpyiVFMJb6xyQF40aT31kI8Ge%2BUkBbkWDphcEPogd59krBEpwz%0AfBfPdlGoTrSwfbKbshM0kiEbPh%2BESMVvypg%2BPZo1Qp0eXYt7gjlYYqNzQHWobTTr%0AIQjY3T8vml7XlcPzxLFqvQliuIZyRLczvm%2BwDhTj%2BJ%2FdXAK0SHE%2F9XdqKY014j5t%0AWjUfy9iD6seZ85ntAWdxHmOkytANe3QfyVxbO3N31nFe4uqJmW0RaEDx0em3k9YM%0AYLe5OwK%2F49IpUj5gV1R3wnN0uNOZNOdhkyVJynLDJXV5DLoWO3yGMPM3iM%2BZGujk%0A4QrpXjVFscfTHy%2F5%2BbNFGHnapljzli9cbKqt3j610wLQa1pHj6K3xJOANwr0Vdjy%0ABFGwpREQDPceSNREFA%2B7FdPh7WQe7P5NbfYuBXGZZeIvRZ6R0EHi8Agxn1426qYJ%0AEJNr%2BqO2r49EhfCdwbizRLhBsqMJQIirkf5sI4w5RIgpI9ggkv%2FgQiqxvqFcDdK7%0AAVK%2BeZiB2bvY3SVaH49hWaCE1OZ28gDYPlce6ARxznq1eqQhvgUyOffjpDjPgSkF%0AQhQCj6%2Fle9lunPkNKEYUhFr2eBBabBejRAsdLTOslG3yltICpBjHGqOB2CaDlHgL%0Aa5eoeqHusBAx9fmYtd0Zi474cGay8RjGtq%2FE%2B8wDTsupnYGbsHF5pDXC7erW9gyZ%0AMzIE8wAZ%2BIxbhG7JXVtHaPWAbvl1ac7YBV7rpBYRKuvZvDQ9BL%2FtYy59HA%3D%3D%0A%3Dt1CY%0A-----END%20PGP%20MESSAGE-----&message_id=166b194b21a0997c&senderEmail=human%40flowcrypt.com&is_outgoing=___cu_false___&account_email=flowcrypt.compatibility%40gmail.com"
      });
    }));

    ava.default(`decrypt - [gpg] signed fully armored message`, testWithBrowser('compatibility', async (t, browser) => {
      await BrowserRecipe.pgpBlockVerifyDecryptedContent(t, browser, {
        content: [
          "this was encrypted with gpg",
          "gpg --sign --armor -r flowcrypt.compatibility@gmail.com ./text.txt"
        ],
        quoted: false,
        "params": "?frameId=none&message=-----BEGIN%20PGP%20MESSAGE-----%0A%0AowGbwMvMwMVYfy8j1GPd8g7GNXlJHCWpFSV6JRUlcSH3akoyMosVyhOLFVLzkosq%0AC0pSUxTKM0syFNIL0rm4gISCrm5xZnoekEosys0vUtAtUkjLyS8Hq9VLzs8tSCzJ%0ATMrMySypdEjPTczMAYkp6OnDrODqZDJmYWDkYpAVU2QJVTh1Tmeb3HLhpxtYYQ5i%0AZQK5goGLUwAmYl8mwDC3yqJ3RqXeax2n108b42sc%2BI29zE1fLvdgq1Tz3ZL0a2Z5%0AXSTDobXyoiGnj748k%2F8iX7dJYc5C%2BTTmPMXtPmYJKmd7V7v2x6675BfR%2Bm25ednr%0APfEB9k%2B47iQ9yNsgu9TG8NC%2FhhccalMkT1UUcv7V07mW2ZRbfvSop1ZSU%2FbXm3c%2F%0A8nd%2BZShfmrHQYMMfe3Xmildmbhs2f7S6I8G%2ByamhrH1XsnXKlc%2Fca63S53TU7u5e%0A%2BX7vil97zTc3cDgtP%2Fuw6GB6mmTo8mqlb20GytG1LuYzZftP55XYL7XyO5M8Rzx2%0AZcLBPTsfzs8o6bgxt0fBucIlds7nzLOyKld%2BG2u%2BuSqzuj9wgpeOSX149f%2B8y7N%2F%0Ahl5nbXIo3qL3QXaWwsXvh7fITVp155%2FbxSXKX65fuLmh%2BET24Z9C7V8iGf9M7v76%0AtI%2BjSNRu7cnAttxlX4tOGHhtuMH%2BTU8nNv1cPEc1X%2FH1VRv95mWabl3lP%2BHVmou%2F%0ArkyN1%2FsWl7tS%2FfZP3vVlp3MSPvqy%2FP6T3VKhXSYdWFzhyblB6KhqzAbBuuVf%2F2bY%0AKRx1239v9uZrM3yEZOc0JtzNz7Lh7xb6e89tIne4blx81aRT7b86YroUHGfe0PF4%0AsHjRnQWdmeU2kgcmH%2BLUEdxd4bJgx%2FSQwPrb%2B6zieQ0mLbDsvZm7gHFPeq5ZW%2B%2Fe%0ABU8%2FcNc2bd49KWrdT8%2FzKpJ9KmvV9uz4AQA%3D%0A%3Dr8So%0A-----END%20PGP%20MESSAGE-----&hasPassword=___cu_false___&msgId=1707b9c96c5d7893&senderEmail=flowcrypt.compatibility%40gmail.com&isOutgoing=___cu_true___&acctEmail=flowcrypt.compatibility%40gmail.com"
      });
    }));

    ava.default(`decrypt - encrypted missing checksum`, testWithBrowser('compatibility', async (t, browser) => {
      await BrowserRecipe.pgpBlockVerifyDecryptedContent(t, browser, {
        content: ["400 library systems in 177 countries worldwide"],
        params: "?account_email=flowcrypt.compatibility%40gmail.com&frame_id=frame_DfGthWpEth&message=-----BEGIN%20PGP%20MESSAGE-----%0AVersion%3A%20FlowCrypt%205.0.4%20Gmail%20Encryption%20flowcrypt.com%0AComment%3A%20Seamlessly%20send%2C%20receive%20and%20search%20encrypted%20email%0A%0AwcFMA%2BADv%2F5v4RgKAQ%2F%2BK2rrAqhjMe9FLCfklI9Y30Woktg0Q%2Fxe71EVw6WO%0AtVD%2FVK%2Bxv4CHzi%2BHojtE0U2F%2BvqoPSO0q5TN9giKPMTiK25PnCzfd7Q%2BzXiF%0Aj%2B5RSHTVJxC62qLHhtKsAQtC4asub8cQIFXbZz3Ns4%2B7jKtSWPcRqhKTurWv%0AXVH0YAFJDsFYo26r2V9c%2BIe0uoQPx8graEGpKO9GtoQjXMKK32oApuBSSlmS%0AQ%2BnxyxMx1V%2BgxP4qgGBCxqkBFRYB%2FVe6ygNHL1KxxCVTEw9pgnxJscn89Iio%0AdO6qZ9EgIV0PVQN0Yw033MTgAhCHunlE%2FqXvDxib4tdihoNsLN0q5kdOeiMW%0A%2Bntm3kphjMpQ6TMCUGtdS7UmvnadZ%2Bdh5s785M8S9oY64mQd6QuYA2iy1IQv%0Aq3zpW4%2Fba2gqL36qCCw%2FOaruXpQ4NeBr3hMaJQjWgeSuMsQnNGYUn5Nn1%2B9X%0AwtlithO8eLi3M1dg19dpDky8CacWfGgHD7SNsZ2zqFqyd1qtdFcit5ynQUHS%0AIiJKeUknGv1dQAnPPJ1FdXyyqC%2FVDBZG6CNdnxjonmQDRh1YlqNwSnmrR%2FSy%0AX7n%2BnGra%2B%2F0EHJW6ohaSdep2jAwJDelq%2FDI1lqiN16ZXJ2%2FWH6pItA9tmkLU%0A61QUz6qwPAnd0t6iy%2FYkOi2%2Fs1%2BdwC0DwOcZoUPF8bTBwUwDS1ov%2FOYtlQEB%0AD%2F46rCPRZrX34ipseTkZxtw3YPhbNkNHo95Mzh9lpeaaZIqtUg2yiFUnhwLi%0AtYwyBCkXCb92l1GXXxGSmvSLDSKfQfIpZ0rV5j50MYKIpjSeJZyH%2F3qP%2BJXv%0AZ47GsTp0z5%2FoNau5XQwuhLhUtRoZd1WS9ahSJ1akiKeYJroLbTg10fjL25yp%0AiaoV16SqKA1H%2FJOuj6lT5z1nuez35JjeSpUc7ksdot60ZovMfWC%2BOGRnkYKb%0A7KxFd7uaxL6uOBOFyvRxYeohKd73aVkiKpcWd4orI18FhlftFNAwIdsmfzNc%0AmzTHZaUl89iYxEKR6ae6AKws1wzLq0noarsf2eKBVbTSfmK3S3xFqduKINnc%0Ae5Yb3F5adSj1dUjm1BZ4aqzsgKyBb%2BJ8keG9ESsnFOyxOIUXDM1nIo1IOgzC%0AM928Jb9GVa%2BuhdXRrb5cLjTihTusJN0I8oJrwKkwIpCJVgPMdDLkeubrMBQ4%0Afbpl4V76sOU2Nx%2B6nG2FnFBFBFohOL%2B0nTK5%2F6Ns9ateN7K9VP%2B%2BQcoeqfPk%0AIUO3%2BlCZW%2BtrTSvvFId3ziUVsPTeuAS%2B7nxSMfWZ%2FK9Ci6QV%2FXnx3F%2FqSmuS%0AAUm4zPQ1EjZf1N%2F5K%2BvhcCTN4MMx406VlqtedkXL2KPwZ6jDS%2Fww8RfcmPnD%0As94ct0WCZZtNlnQq%2B5h0ybwTJNLC2QFyrhhPqztVY95n9La2Mw5WITCWzg%2Fd%0AIBUceW%2FOwHYtePyaSQkCnegDw%2F2mN2%2FGC8d0OlwULcTYG6uVenGv2UOUbCr3%0APfy%2FEb%2FVqUEZK00PdvVQV7FWYAshuTFPTqidph04CgQvBpi3SDEEo8SkEIFS%0A%2FiEeRQaWjFEXKUI3FwKXPJQWvFpbrXBOAjnxXXbAFYOLxdydmq1GVl9Mm3GU%0AClc9g6t9vaYDBPx2gN562%2FCM%2FnT8Vq45VHe79XkrrcHDwLn7yeHJScNFsib%2B%0AVvwTPoUftlhC%2Fai21D403TsJpm7ZmPcDjagoIcXrS%2FlN03z79RBmSKFtYiXW%0A4obkKSGow61vMBh2%2FXLVYKJKpYKm%2FGnVlJxA0zQVl558x8I%2FnAMaxSzwx%2BZY%0AwaVU%2Fs5PLZ7Ghg3MOguiRTlflKUQyL0A7NR46OjFgUnHAZRxr4KO3GoxVPy4%0AXLeS4%2BWl68s7QlV6WF1IKCHWEUMEeRRea2%2FOvvlS%2FoLs2MNNWDemlJ4SiXHf%0AxINU38Txo84A00NALbKppsSyy9Gwj%2F%2FrO%2FFcerupkfeuOm9nHFwIQeeC5bWD%0AmmRlC90r2jY8gM%2Fv3Jjy9h8PbXWxh9MUpc7%2FkAcTwdGlMxiVjE29p065qTRr%0AOi6sJ7pWuYTfWldZqTVmaBjlv0zuXQ8Eo8o%2FUSvoTs%2BoihYIMcqReqdeqr%2FN%0Ae%2BsDtYKRg%2FLKp%2FJJ5nAQzVMP67DxkgwLNxx0ijBLysaQmvRlsiYWayxZB1Xd%0ABxA2bjZRvsmww%2BhgSKNlcsiubJGBqfqvgmlebZuJHHSC1L6mdMYgcihKmYAj%0Ap%2BHFLyqgyeRVMdjRHcrEdxNPG4fJmlk1bYiVQQ4XAd72w%2BAHS%2FseZ5HzbAK0%0AomuHYUD5PTEqZ1K9JObSsh3XMUkJK%2Bz3BnrOxnTOOyG2r%2B4FxizH6rfz%2FPgg%0AsPxqxE9ELUlgQe8plcPFge6aN9tUoSe%2BvMtDaEAqKw9JwofBF7jlxTqMMvQC%0AgWbn9x3W5o4VrnpjYGtPl8sh1QREu0A%2B0PUJAKL4A3GSMYRouGewLSMNJlOg%0A%2F0pPF6qB%2BFi4GJ7ju5C07tfr9z9UqRj09kDXJuoJd95NdSiCz6ndugn6gs8B%0AQf%2FXPxZVefeMLiB6p8pG0iZ%2FjcJjyYJLtTg6kA%2B1%2FffmJPfH%2F76ZA9dgEJLj%0A%2FW2u0Lp4NY8cwqcXuGKgl72TVJ34Iawl35Y0yr47k%2F7Y1vEQ5Q3bT7HP5A%3D%3D%0A-----END%20PGP%20MESSAGE-----&message_id=15f7ffbebc6ba296&senderEmail=flowcrypt.compatibility%40gmail.com&is_outgoing=___cu_true___"
      });
    }));

The private keys used to decrypt these examples are one of these two:

    {
      "passphrase": "flowcrypt compatibility tests",
      "armored": "-----BEGIN PGP PRIVATE KEY BLOCK-----\r\nVersion: FlowCrypt 6.9.1 Gmail Encryption\r\nComment: Seamlessly send and receive encrypted email\r\n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\r\ntiL0VgGWS0GVL1cZMUwhvvu8bxI=\r\n=2z30\r\n-----END PGP PRIVATE KEY BLOCK-----\r\n",
      "longid": "ADAC279C95093207",
    },
    {
      "passphrase": "flowcrypt compatibility tests 2",
      "armored": "-----BEGIN PGP PRIVATE KEY BLOCK-----\r\nVersion: FlowCrypt 6.9.1 Gmail Encryption\r\nComment: Seamlessly send and receive encrypted 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PGP PRIVATE KEY BLOCK-----\r\n",
      "longid": "7FDE685548AEA788",
    },

[DenBond7]

@DenBond7 the original return code also had the following used for diagnostics:

  longids: {
    message: List<String>, // for which longids was message encrypted
    matching: List<String>, // which of above longids match provided keys
    chosen: List<String>, // which longids were chosen for decryption (pass phrase available)
    needPassphrase: List<String> // which longids were missing pass phrase
  }

Which of these are you using on Android? Or are these currently ignored?

Currently we don't use any of that info

[tomholub]

Got it. Later we'll use them for diagnostics and pass phrase handling (once we implement pass phrase in session), but for now we don't have to implement them.

[IvanPizhenko]

what is original function which we are trying to port in this issue? PgpMsg.decrypt()?

[tomholub]

Yes, but a lot of code there is very library-specific so I primarily care about the error scenarios here