newbie question

[MilaSy]

Hi TonyG
In my php I'm using sodium_bin2hex(sodium_crypto_box_publickey(sodium_crypto_box_keypair())) which I pass to the javascript:
bpkeypair='';
nacl_factory.instantiate(function(nacl){
akeypair=nacl.crypto_box_keypair();
message=nacl.encode_utf8(msg);
nonce=nacl.crypto_box_random_nonce();
});
nacl_factory.instantiate(function(acl){
ctext=acl.crypto_box(message,nonce,bpkeypair,akeypair.boxSk);
n2h=acl.to_hex(nonce);
});

when I pass "cipher text" and the "nonce to hex" back to php through ajax and try to decrypt the message using:
$jsnonce=sodium_hex2bin($n2h);
$keydc=$keysk.$pk;
$text=sodium_crypto_box_open($ctext,$jsnonce,$keydc);

I get this error:
Uncaught SodiumException: keypair size should be SODIUM_CRYPTO_BOX_KEYPAIRBYTES.

I'll attach the two files Im using to play around. Please help?
Thanks very much

test.docx
testrespoonse.docx

[RicardoSette]

Hi @EmileDew,

I had crypto_box and crypto_secretbox compatibility with PHP 5.6.

Here's an example I used for proof of concept with PHP 5.6
example.php.txt
example.ajax.php.txt

If you are using PHP 7.1 or higher replace "\Sodium" with "sodium_" in PHP code.

[MilaSy]

Thank you so much @RicardoSette :)
Going to check it out now :D

[tonyg]

Hi @EmileDew. In this snippet...

$keydc=$keysk.$pk;
$text=sodium_crypto_box_open($ctext,$jsnonce,$keydc);

... it looks like you're passing the public key to crypto_box_open? You probably need to supply the recipient's secret key (and the sender's public key).

@RicardoSette, thanks for supplying your example code!