[openpgpjs] Decrypting with a public key

[Bruno Barberi Gnecco]

Hi,

I posted this as an issue but it seems more appropriate to this list.

Is it possible to encrypt with a private key and decrypt with a public key? I 
want to send 
data that is guaranteed to be from a sender and I'd rather not send it as clear 
text, so 
just signClearMessage() is not an option. decryptAndVerifyMessage() requires 
both the 
public and private keys, so also not an option.

I can encrypt with a private key easily:

     var publicKey = openpgp.key.readArmored(fs.readFileSync('public.key', 
'utf-8'));
     var privateKey = openpgp.key.readArmored(fs.readFileSync('private.key', 
'utf-8')).keys[0];
     privateKey.decrypt(PASSPHRASE);
     openpgp.encryptMessage(privateKey, text).then(function(pgpMessage){ // 
yes, private });

But trying to decrypt with a public key does not work. This returns Error: 
Private key is 
not decrypted.

     pgpMessage = openpgp.message.readArmored(pgpMessage);
     openpgp.decryptMessage(publicKey.keys[0], pgpMessage).then(function(plain) 
{
         ....
     });

But publicKey.keys[0].decrypt(PASSPHRASE) throw Error: Nothing to decrypt in a 
public key.

Any tips?

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