I tried with data from http://dev.twitter.com/pages/xauth:

(function() {
var secret = "5kEQypKe7lFHnufLtsocB1vAzO07xLFgp2Pc4sp2vk&";
var access_token = "oauth_consumer_key=sGNxxnqgZRHUt6NunK3uw" +
"&oauth_nonce=WLxsobj4rhS2xmCbaAeT4aAkRfx4vSHX4OnYpTE77hA" +
"&oauth_signature_method=HMAC-SHA1" +
"&oauth_timestamp=1276101652" +
"&oauth_version=1.0" +
"&x_auth_mode=client_auth" +
"&x_auth_password=%&123!aZ+()456242134" +
"&x_auth_username=tpFriendlyGiant";
var base_string = "POST&" +
encodeURIComponent(
"https://api.twitter.com/oauth/access_token";) + "&" +
encodeURIComponent(access_token);

console.debug("base_string", base_string);
console.debug("oauth_signature", b64_hmac_sha1(secret, base_string));
})();


This is my base_string:

POST&https%3A%2F%2Fapi.twitter.com%2Foauth
%2Faccess_token&oauth_consumer_key=sGNxxnqgZRHUt6NunK3uw&oauth_nonce=WLxsobj4rhS2xmCbaAeT4aAkRfx4vSHX4OnYpTE77hA&oauth_signature_method=HMAC-
SHA1&oauth_timestamp=1276101652&oauth_version=1.0&x_auth_mode=client_auth&x_auth_password=
%25&123!aZ+()456242134&x_auth_username=tpFriendlyGiant

This on is from dev.twitter.com

POST&https%3A%2F%2Fapi.twitter.com%2Foauth
%2Faccess_token&oauth_consumer_key%3DsGNxxnqgZRHUt6NunK3uw
%26oauth_nonce%3DWLxsobj4rhS2xmCbaAeT4aAkRfx4vSHX4OnYpTE77hA
%26oauth_signature_method%3DHMAC-SHA1%26oauth_timestamp
%3D1276101652%26oauth_version%3D1.0%26x_auth_mode%3Dclient_auth
%26x_auth_password%3D%2525%2526123%2521aZ%252B
%2528%2529456242134%26x_auth_username%3DtpFriendlyGiant


I found the differences in encoding %&123!aZ+() prefix from password
in base_string:

>From dev.twitter.com/pages/xauth:

%2525%2526123%2521aZ%252B%2528%2529

>From code above:

%25%26123!aZ%2B()

I use wrong encoding method then and encoding is wrong applied?

BR,
Michał Łowicki

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