ObjectivePGP and OpenPGP compatibility

[Aman035]

Building an encrypted system which uses openPGP for keys generation, encryption, decryption for browsers and ObjectivePGP for ios app for the same functions. The issue I am facing is when I generate keys using objectivePGP on my ios app and try to encrypt / decrypt something on browser, it fails. Is there any work around or any better approach that I can follow.

Key Generation In Swft

 let key: Key = KeyGenerator(
      algorithm: .RSA, keyBitsLength: 2048, cipherAlgorithm: .AES256, hashAlgorithm: .SHA1
    ).generate(for: "", passphrase: nil)

Non Working Script ( Keys generated using ObjectivePGP and OpenPGP is used for encryption / decryption )

import {
  pgpEncrypt,
  pgpDecrypt,
} from './pgp'

const main = async () => {
  // Generate
  const privateKeyArmored = `-----BEGIN PGP PRIVATE KEY BLOCK-----
  Version: ObjectivePGP
  Comment: https://objectivepgp.com
  Charset: UTF-8
  
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  =6OZt
  -----END PGP PRIVATE KEY BLOCK-----`

  const publicKeyArmored = `-----BEGIN PGP PUBLIC KEY BLOCK-----
  Version: ObjectivePGP
  Comment: https://objectivepgp.com
  Charset: UTF-8
  
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  =WC1q
  -----END PGP PUBLIC KEY BLOCK-----`

  // Encrypt
  const text = 'I am a secret'
  const encryptedText = await pgpEncrypt({
    plainText: text,
    keys: [publicKeyArmored],
  })
  console.log(encryptedText)

  // Decrypt
  const decryptedText = await pgpDecrypt({
    cipherText: encryptedText,
    toPrivateKeyArmored: privateKeyArmored,
  })
  console.log(decryptedText)
}
main()

Working Script

import {
  pgpEncrypt,
  pgpDecrypt,
  generateKeyPair,
} from './pgp'

const main = async () => {
  // Generate
  const { privateKeyArmored, publicKeyArmored } = await generateKeyPair()
  console.log(privateKeyArmored)
  console.log(publicKeyArmored)

  // Encrypt
  const text = 'I am a secret'
  const encryptedText = await pgpEncrypt({
    plainText: text,
    keys: [publicKeyArmored],
  })
  console.log(encryptedText)

  // Decrypt
  const decryptedText = await pgpDecrypt({
    cipherText: encryptedText,
    toPrivateKeyArmored: privateKeyArmored,
  })
  console.log(decryptedText)
}
main()

Here is the functions I am using

import * as openpgp from 'openpgp'

export const generateKeyPair = async (): Promise<{
  privateKeyArmored: string
  publicKeyArmored: string
}> => {
  const keys = await openpgp.generateKey({
    type: 'rsa',
    rsaBits: 2048,
    userIDs: [{ name: '', email: '' }],
  })
  return {
    privateKeyArmored: keys.privateKey,
    publicKeyArmored: keys.publicKey,
  }
}

export const pgpEncrypt = async ({
  plainText,
  keys,
}: {
  plainText: string
  keys: Array<string>
}): Promise<string> => {
  const pgpKeys: openpgp.Key[] = []

  for (let i = 0; i < keys.length; i++) {
    pgpKeys.push(await openpgp.readKey({ armoredKey: keys[i] }))
  }
  const message: openpgp.Message<string> = await openpgp.createMessage({
    text: plainText,
  })
  const encrypted: string = <string>await openpgp.encrypt({
    message: message,
    encryptionKeys: pgpKeys,
  })
  return encrypted
}

export const sign = async ({
  message,
  signingKey,
}: {
  message: string
  signingKey: string
}): Promise<string> => {
  const messageObject: openpgp.Message<string> = await openpgp.createMessage({
    text: message,
  })
  const privateKey: openpgp.PrivateKey = await openpgp.readPrivateKey({
    armoredKey: signingKey,
  })
  return <string>await openpgp.sign({
    message: messageObject,
    signingKeys: privateKey,
    detached: true,
  })
}

export const verifySignature = async ({
  messageContent,
  signatureArmored,
  publicKeyArmored,
}: {
  messageContent: string
  signatureArmored: string
  publicKeyArmored: string
}): Promise<void> => {
  const message: openpgp.Message<string> = await openpgp.createMessage({
    text: messageContent,
  })
  const signature: openpgp.Signature = await openpgp.readSignature({
    armoredSignature: signatureArmored,
  })
  const publicKey: openpgp.PublicKey = await openpgp.readKey({
    armoredKey: publicKeyArmored,
  })
  const verificationResult = await openpgp.verify({
    message,
    signature,
    verificationKeys: publicKey,
  })
  const { verified } = verificationResult.signatures[0]
  try {
    await verified
  } catch (e) {
    throw new Error('Signature could not be verified: ' + e)
  }
}

export const pgpDecrypt = async ({
  cipherText,
  toPrivateKeyArmored,
}: {
  cipherText: any
  toPrivateKeyArmored: string
}): Promise<string> => {
  const message = await openpgp.readMessage({ armoredMessage: cipherText })
  const privateKey: openpgp.PrivateKey = await openpgp.readPrivateKey({
    armoredKey: toPrivateKeyArmored,
  })

  const { data: decrypted } = await openpgp.decrypt({
    message,
    decryptionKeys: privateKey,
  })

  return decrypted as string
}