Fully end to end encrypted anonymous chat program. Server only stores public key lookup for users and the encrypted messages. No credentials are transfered to the server, but kept in local browser storage. This allows 100% safe chatting. https://safechat.ch
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<?php
/// Send Error To Client
/** @return error message from server to client
Function calls exit to terminate.
Message format is json:
@code
{
success: false,
txt: 'error message string';
}
@endcode */
function error($txt) {
echo json_encode(array('success' => false, 'txt' => $txt));
exit;
}
/// Send Success To Client
/** @return success message from server to client
Function calls exit to terminate.
Message format is json:
@code
{
success: true,
txt: 'success message string';
}
@endcode */
function success($txt) {
echo json_encode(array('success' => true, 'txt' => $txt));
exit;
}
function getoption($name, $default) {
if (!isset($OPTION[$name])) {
$q = $db->query("select value from options where name='$name';");
if ($q->num_rows==1) {
$OPTION[$name]=$q->fetch_row()[0];
} else {
if (isset($_SERVER[$name]))
$OPTION[$name]=$_SERVER[$name];
else
$OPTION[$name]=$default;
$q = $db->query("insert into options (name, value) values ('$name', '$value');");
}
}
return $OPTION[$name];
}
/// Create user safechat as server's identity
/** Server has reserved username @c safechat */
function createSafechatUser() {
$q = $db->query("select pubkey from user where name='safechat';");
if ($q->num_rows!=1 && $user=="safechat") {
$KEY_LENGTH=getoption("KEYLEN", "4096");
$SAFECHAT_NAME=getoption("NAME", "Safe Chat");
$SAFECHAT_COMMENT=getoption("COMMENT", "https://safechat.ch");
$SAFECHAT_EMAIL=getoption("EMAIL", "server@safechat.ch");
$PASSWORD=getoption("PASSWORD", "s3Cr37");
$create_key_cmd=<<<EOT
gpg -v -v --gen-key --batch <<EOF
Key-Type: RSA
Key-Length: 4096
Subkey-Type: RSA
Subkey-Length: 4096
Name-Real: ${SAFECHAT_NAME}
Name-Comment: ${SAFECHAT_COMMENT}
Name-Email: ${SAFECHAT_EMAIL}
Expire-Date: 0
Passphrase: ${PASSWORD}
%echo generating key for ${SAFECHAT_NAME} ...
%commit
%echo done.
EOF
EOT;
system($create_key_cmd);
gnupg_setarmor($pgp, 1);
$export = gnupg_export($pgp, ${SAFECHAT_NAME});
$q = $db->query("insert into user (name, pubkey) values ('safechat', '$export');");
}
}
?>