PBKDF2.js

function PBKDF2(password, salt, num_iterations, num_bytes) {
    var m_bpassword = str2binb(password);
    var m_salt = salt;
    var m_total_iterations = num_iterations;
    var m_iterations_in_chunk = 100;
    var m_iterations_done = 0;
    var m_key_length = num_bytes;
    var m_hash_length = 20;
    var m_total_blocks = Math.ceil(m_key_length / m_hash_length);
    var m_current_block = 1;
    var m_ipad = new Array(16);
    var m_opad = new Array(16);
    var m_buffer = new Array(0x0, 0x0, 0x0, 0x0, 0x0);
    var m_key = "";
    var m_result_func;
    var m_status_func;

    if(m_bpassword.length > 16) {
      m_bpassword = core_sha1(m_bpassword, password.length * chrsz);
    }

    for(var i = 0; i < 16; ++i) {
        m_ipad[i] = m_bpassword[i] ^ 0x36363636;
        m_opad[i] = m_bpassword[i] ^ 0x5C5C5C5C;
    }

    this.deriveKey = function() {
        return this.do_PBKDF2_iterations();
    }


    this.do_PBKDF2_iterations = function()
    {
        while(1) {
            var iterations = m_total_iterations;

            for(var i = 0; i < iterations; ++i) {
                if(m_iterations_done == 0) {
                    var salt_block = m_salt +
                                     String.fromCharCode(m_current_block >> 24 & 0xF) +
                                     String.fromCharCode(m_current_block >> 16 & 0xF) +
                                     String.fromCharCode(m_current_block >> 8 & 0xF) +
                                     String.fromCharCode(m_current_block & 0xF);

                    m_hash = core_sha1(m_ipad.concat(str2binb(salt_block)), 512 + salt_block.length * 8);
                    m_hash = core_sha1(m_opad.concat(m_hash), 512 + 160);
                }
                else {
                    m_hash = core_sha1(m_ipad.concat(m_hash), 512 + m_hash.length * 32);
                    m_hash = core_sha1(m_opad.concat(m_hash), 512 + 160);
                }

                for(var j = 0; j < m_hash.length; ++j) {
                    m_buffer[j] ^= m_hash[j];
                }

                m_iterations_done++;
            }

            if(m_current_block < m_total_blocks) {
                m_key += binb2hex(m_buffer);

                m_current_block++;
                m_buffer = new Array(0x0, 0x0, 0x0, 0x0, 0x0);
                m_iterations_done = 0;
            }
            else {
                var tmp = binb2hex(m_buffer);
                m_key += tmp.substr(0, (m_key_length - (m_total_blocks - 1) * m_hash_length) * 2);

                return GibberishAES.s2a(hex2bin(m_key));
            }
        }
    }
}