pana_cookie.cxx

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/* Open Diameter: Open-source software for the Diameter and               */
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#include "ace/System_Time.h"
#include "pana_sha1.h"
#include "pana_cookie.h"

PANA_Cookie::PANA_Cookie()
{
    char sbuf[32];
    ACE_UINT32 ltime;
    ACE_System_Time::get_local_system_time(ltime);

    /* --- seed and generate secret table --- */
    ACE_OS::srand(ltime);
    for (int i = 0; i < default_table_size_; i ++) {
        ACE_OS::sprintf(sbuf, "%0.4x", ACE_OS::rand());
        s_table_[i] = sbuf;
    }

    s_index_ = 0; // initial index
}

bool PANA_Cookie::Generate(std::string &id, std::string &digest)
{
    return Generate(s_index_, id, digest);
}

bool PANA_Cookie::Generate(ACE_UINT32 ndx, std::string &id, std::string &digest)
{
    unsigned char sbuf[32];
    ACE_OS::memset(sbuf, 0x0, sizeof(sbuf));
    ACE_OS::memcpy(sbuf, &ndx, sizeof(ACE_UINT32));

    PANA_Sha1 sha1;
    sha1.Update((unsigned char*)id.data(), id.size());
    sha1.Update((unsigned char*)s_table_[ndx].data(), sizeof(ACE_UINT32));
    sha1.Final();

    sha1.GetHash(sbuf + sizeof(ACE_UINT32));
    digest.assign((char*)sbuf, 20 + 2 * sizeof(ACE_UINT32)); // sha1 hash + index

    return (true);
}

bool PANA_Cookie::Verify(std::string &id, std::string &digest)
{
    std::string testDigest;
    for (int i = 0; i < default_table_size_; i ++) {
        Generate(i, id, testDigest);
        // 24 byte sha1 hash value comparison
        if (ACE_OS::memcmp(testDigest.data(), digest.data(), 20 + 2 * sizeof(ACE_UINT32)) == 0) {
            return (true);
        }
    }
    return (false);
}

void PANA_Cookie::Cycle()
{
    s_index_ ++;
    if (s_index_ > default_table_size_) {
        s_index_ = 0;
    }
}

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