Compatibility between OpenPGP and ObjectivePGP

Question

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.

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
}

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()

Non Working Script ( Keys generated using ObjectivePGP )

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
  
  xsBNBGSv/dwBCADEjAZ4+CyWp//PqBtf13RCL0ch6PvhfRrhc8hMIMDEDcEsBK8cnPmBYar/OuRz
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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()