/*
    SPDX-License-Identifier: GPL-3.0-or-later
    Copyright © 2015-2021 Amebis
    Copyright © 2016 GÉANT
*/

#include "PCH.h"

#pragma comment(lib, "Crypt32.lib")

using namespace std;
using namespace winstd;


//////////////////////////////////////////////////////////////////////
// Internal functions
//////////////////////////////////////////////////////////////////////

inline static unsigned char kph_gen_cyro_key(_In_ int keycode, _In_ size_t index);
template<class _Elem, class _Traits, class _Ax> inline static basic_string<_Elem, _Traits, _Ax> kph_encode(_In_ unsigned char data);
template<class _Elem> inline static unsigned char kph_decode(_In_ const _Elem str[2]);
template<class _Elem, class _Traits, class _Ax> inline static basic_string<_Elem, _Traits, _Ax> kph_encrypt(_In_ HCRYPTPROV hProv, _In_z_ const char *src);
template<class _Elem> inline static sanitizing_string kph_decrypt(_In_z_ const _Elem *src);


//////////////////////////////////////////////////////////////////////
// eap::credentials
//////////////////////////////////////////////////////////////////////

eap::credentials::credentials(_In_ module &mod) : config(mod)
{
}


eap::credentials::credentials(_In_ const credentials &other) :
    m_identity(other.m_identity),
    config(other)
{
}


eap::credentials::credentials(_Inout_ credentials &&other) noexcept :
    m_identity(std::move(other.m_identity)),
    config(std::move(other))
{
}


eap::credentials& eap::credentials::operator=(_In_ const credentials &other)
{
    if (this != &other) {
        (config&)*this = other;
        m_identity     = other.m_identity;
    }

    return *this;
}


eap::credentials& eap::credentials::operator=(_Inout_ credentials &&other) noexcept
{
    if (this != &other) {
        (config&)*this = std::move(other);
        m_identity     = std::move(other.m_identity);
    }

    return *this;
}


void eap::credentials::clear()
{
    m_identity.clear();
}


bool eap::credentials::empty() const
{
    return m_identity.empty();
}


void eap::credentials::save(_In_ IXMLDOMDocument *pDoc, _In_ IXMLDOMNode *pConfigRoot) const
{
    assert(pDoc);
    assert(pConfigRoot);

    config::save(pDoc, pConfigRoot);

    HRESULT hr;

    // <UserName>
    if (!m_identity.empty())
        if (FAILED(hr = eapxml::put_element_value(pDoc, pConfigRoot, bstr(L"UserName"), namespace_eapmetadata, bstr(m_identity))))
            throw com_runtime_error(hr, __FUNCTION__ " Error creating <UserName> element.");
}


void eap::credentials::load(_In_ IXMLDOMNode *pConfigRoot)
{
    assert(pConfigRoot);
    HRESULT hr;

    config::load(pConfigRoot);

    wstring xpath(eapxml::get_xpath(pConfigRoot));

    if (FAILED(hr = eapxml::get_element_value(pConfigRoot, bstr(L"eap-metadata:UserName"), m_identity)))
        m_identity.clear();

    m_module.log_config((xpath + L"/UserName").c_str(), m_identity.c_str());
}


void eap::credentials::operator<<(_Inout_ cursor_out &cursor) const
{
    config::operator<<(cursor);
    cursor << m_identity;
}


size_t eap::credentials::get_pk_size() const
{
    return
        config::get_pk_size() +
        pksizeof(m_identity);
}


void eap::credentials::operator>>(_Inout_ cursor_in &cursor)
{
    config::operator>>(cursor);
    cursor >> m_identity;
}


wstring eap::credentials::get_identity() const
{
    return m_identity;
}


tstring eap::credentials::get_name() const
{
    tstring identity(std::move(get_identity()));
    return
        !identity.empty() ? identity :
        empty()           ? _T("(none)") : _T("(blank ID)");
}


//////////////////////////////////////////////////////////////////////
// eap::credentials_identity
//////////////////////////////////////////////////////////////////////

eap::credentials_identity::credentials_identity(_In_ module &mod) : credentials(mod)
{
}


eap::credentials_identity::credentials_identity(_In_ const credentials_identity &other) : credentials(other)
{
}


eap::credentials_identity::credentials_identity(_Inout_ credentials_identity &&other) noexcept : credentials(std::move(other))
{
}


eap::credentials_identity& eap::credentials_identity::operator=(_In_ const credentials_identity &other)
{
    if (this != &other)
        (credentials&)*this = other;

    return *this;
}


eap::credentials_identity& eap::credentials_identity::operator=(_Inout_ credentials_identity &&other) noexcept
{
    if (this != &other)
        (credentials&)*this = std::move(other);

    return *this;
}


eap::config* eap::credentials_identity::clone() const
{
    return new credentials_identity(*this);
}


void eap::credentials_identity::save(_In_ IXMLDOMDocument *pDoc, _In_ IXMLDOMNode *pConfigRoot) const
{
    assert(pDoc);
    assert(pConfigRoot);

    // We could have used credentials::save() to save identity,
    // but that method tolerates absence of <UserName> element,
    // whereas for this class the absence of <UserName> is fatal.
    config::save(pDoc, pConfigRoot);

    HRESULT hr;

    // <UserName>
    if (FAILED(hr = eapxml::put_element_value(pDoc, pConfigRoot, bstr(L"UserName"), namespace_eapmetadata, bstr(m_identity))))
        throw com_runtime_error(hr, __FUNCTION__ " Error creating <UserName> element.");
}


void eap::credentials_identity::load(_In_ IXMLDOMNode *pConfigRoot)
{
    assert(pConfigRoot);
    HRESULT hr;

    // We could have used credentials::load() to load identity,
    // but that method tolerates absence of <UserName> element,
    // whereas for this class the absence of <UserName> is fatal.
    config::load(pConfigRoot);

    wstring xpath(eapxml::get_xpath(pConfigRoot));

    if (FAILED(hr = eapxml::get_element_value(pConfigRoot, bstr(L"eap-metadata:UserName"), m_identity)))
        throw com_runtime_error(hr, __FUNCTION__ " Error reading <UserName> element.");

    m_module.log_config((xpath + L"/UserName").c_str(), m_identity.c_str());
}


void eap::credentials_identity::store(_In_z_ LPCTSTR pszTargetName, _In_ unsigned int level) const
{
    assert(pszTargetName);

    tstring target(target_name(pszTargetName, level));

    // Write credentials.
    assert(m_identity.length() < CRED_MAX_USERNAME_LENGTH);
    CREDENTIAL cred = {
        0,                                     // Flags
        CRED_TYPE_GENERIC,                     // Type
        const_cast<LPTSTR>(target.c_str()),    // TargetName
        _T(""),                                // Comment
        { 0, 0 },                              // LastWritten
        0,                                     // CredentialBlobSize
        NULL,                                  // CredentialBlob
        CRED_PERSIST_ENTERPRISE,               // Persist
        0,                                     // AttributeCount
        NULL,                                  // Attributes
        NULL,                                  // TargetAlias
        const_cast<LPTSTR>(m_identity.c_str()) // UserName
    };
    if (!CredWrite(&cred, 0))
        throw win_runtime_error(__FUNCTION__ " CredWrite failed.");
}


void eap::credentials_identity::retrieve(_In_z_ LPCTSTR pszTargetName, _In_ unsigned int level)
{
    assert(pszTargetName);

    // Read credentials.
    unique_ptr<CREDENTIAL, CredFree_delete<CREDENTIAL> > cred;
    if (!CredRead(target_name(pszTargetName, level).c_str(), CRED_TYPE_GENERIC, 0, (PCREDENTIAL*)&cred))
        throw win_runtime_error(__FUNCTION__ " CredRead failed.");

    if (cred->UserName)
        m_identity = cred->UserName;
    else
        m_identity.clear();

    wstring xpath(pszTargetName);
    m_module.log_config((xpath + L"/Identity").c_str(), m_identity.c_str());
}


LPCTSTR eap::credentials_identity::target_suffix() const
{
    return _T("id");
}


eap::credentials::source_t eap::credentials_identity::combine(
    _In_             DWORD         dwFlags,
    _In_opt_   const credentials   *cred_cached,
    _In_       const config_method &cfg,
    _In_opt_z_       LPCTSTR       pszTargetName)
{
    UNREFERENCED_PARAMETER(dwFlags);

    if (cred_cached) {
        // Using EAP service cached credentials.
        *this = *dynamic_cast<const credentials_identity*>(cred_cached);
        m_module.log_event(&EAPMETHOD_TRACE_EVT_CRED_CACHED2, event_data((unsigned int)cfg.get_method_id()), event_data(credentials_identity::get_name()), event_data(pszTargetName), event_data::blank);
        return source_t::cache;
    }

    auto cfg_with_cred = dynamic_cast<const config_method_with_cred*>(&cfg);
    if (cfg_with_cred && cfg_with_cred->m_use_cred) {
        // Using configured credentials.
        *this = *dynamic_cast<const credentials_identity*>(cfg_with_cred->m_cred.get());
        m_module.log_event(&EAPMETHOD_TRACE_EVT_CRED_CONFIG2, event_data((unsigned int)cfg.get_method_id()), event_data(credentials_identity::get_name()), event_data(pszTargetName), event_data::blank);
        return source_t::config;
    }

    if (pszTargetName) {
        try {
            credentials_identity cred_loaded(m_module);
            cred_loaded.retrieve(pszTargetName, cfg.m_level);

            // Using stored credentials.
            *this = std::move(cred_loaded);
            m_module.log_event(&EAPMETHOD_TRACE_EVT_CRED_STORED2, event_data((unsigned int)cfg.get_method_id()), event_data(credentials_identity::get_name()), event_data(pszTargetName), event_data::blank);
            return source_t::storage;
        } catch (...) {
            // Not actually an error.
        }
    }

    return source_t::unknown;
}


//////////////////////////////////////////////////////////////////////
// eap::credentials_pass
//////////////////////////////////////////////////////////////////////

eap::credentials_pass::credentials_pass(_In_ module &mod) :
    m_enc_alg(enc_alg_t::native),
    credentials(mod)
{
}


eap::credentials_pass::credentials_pass(_In_ const credentials_pass &other) :
    m_password (other.m_password),
    m_enc_alg  (other.m_enc_alg ),
    credentials(other           )
{
}


eap::credentials_pass::credentials_pass(_Inout_ credentials_pass &&other) noexcept :
    m_password (std::move(other.m_password)),
    m_enc_alg  (std::move(other.m_enc_alg )),
    credentials(std::move(other           ))
{
}


eap::credentials_pass& eap::credentials_pass::operator=(_In_ const credentials_pass &other)
{
    if (this != &other) {
        (credentials&)*this = other           ;
        m_password          = other.m_password;
        m_enc_alg           = other.m_enc_alg ;
    }

    return *this;
}


eap::credentials_pass& eap::credentials_pass::operator=(_Inout_ credentials_pass &&other) noexcept
{
    if (this != &other) {
        (credentials&)*this = std::move(other           );
        m_password          = std::move(other.m_password);
        m_enc_alg           = std::move(other.m_enc_alg );
    }

    return *this;
}


eap::config* eap::credentials_pass::clone() const
{
    return new credentials_pass(*this);
}


void eap::credentials_pass::clear()
{
    credentials::clear();
    m_password.clear();
}


bool eap::credentials_pass::empty() const
{
    return credentials::empty() && m_password.empty();
}


void eap::credentials_pass::save(_In_ IXMLDOMDocument *pDoc, _In_ IXMLDOMNode *pConfigRoot) const
{
    assert(pDoc);
    assert(pConfigRoot);

    credentials::save(pDoc, pConfigRoot);

    HRESULT hr;

    // Prepare cryptographics provider.
    crypt_prov cp;
    if (!cp.create(NULL, NULL, PROV_RSA_AES, CRYPT_VERIFYCONTEXT))
        throw win_runtime_error(__FUNCTION__ " CryptAcquireContext failed.");

    // <Password>
    switch (m_enc_alg) {
    case enc_alg_t::kph: {
        sanitizing_string password_utf8;
        WideCharToMultiByte(CP_UTF8, 0, m_password, password_utf8, NULL, NULL);
        wstring password_enc(std::move(kph_encrypt<wchar_t, char_traits<wchar_t>, allocator<wchar_t> >(cp, password_utf8.c_str())));
        com_obj<IXMLDOMElement> pXmlElPassword;
        if (FAILED(hr = eapxml::put_element_value(pDoc, pConfigRoot, bstr(L"Password"), namespace_eapmetadata, bstr(password_enc), std::addressof(pXmlElPassword))))
            throw com_runtime_error(hr, __FUNCTION__ " Error creating <Password> element.");

        pXmlElPassword->setAttribute(bstr(L"encryption"), variant(_L("KPH")));
        break;
    }

    default:
        // Use default encryption method for all others (including unencrypted).
        vector<unsigned char> password_enc(std::move(m_module.encrypt(cp, m_password)));
        com_obj<IXMLDOMElement> pXmlElPassword;
        if (FAILED(hr = eapxml::put_element_base64(pDoc, pConfigRoot, bstr(L"Password"), namespace_eapmetadata, password_enc.data(), password_enc.size(), std::addressof(pXmlElPassword))))
            throw com_runtime_error(hr, __FUNCTION__ " Error creating <Password> element.");

        pXmlElPassword->setAttribute(bstr(L"encryption"), variant(_L(PRODUCT_NAME_STR) _L(" v2")));
    }
}


void eap::credentials_pass::load(_In_ IXMLDOMNode *pConfigRoot)
{
    assert(pConfigRoot);
    HRESULT hr;

    credentials::load(pConfigRoot);

    wstring xpath(eapxml::get_xpath(pConfigRoot));

    // <Password>
    bstr password, encryption;
    com_obj<IXMLDOMElement> pXmlElPassword;
    if (FAILED(hr = eapxml::get_element_value(pConfigRoot, bstr(L"eap-metadata:Password"), password, std::addressof(pXmlElPassword))))
        throw com_runtime_error(hr, __FUNCTION__ " Error reading <Password> element.");

    if (FAILED(eapxml::get_attrib_value(pXmlElPassword, bstr(L"encryption"), encryption)))
        encryption = NULL;

    if (encryption && CompareStringEx(LOCALE_NAME_INVARIANT, NORM_IGNORECASE, encryption, encryption.length(), _L(PRODUCT_NAME_STR) _L(" v2"), -1, NULL, NULL, 0) == CSTR_EQUAL) {
        // Decode Base64.
        winstd::base64_dec dec;
        bool is_last;
        vector<unsigned char> password_enc;
        dec.decode(password_enc, is_last, (BSTR)password, password.length());

        // Prepare cryptographics provider.
        crypt_prov cp;
        if (!cp.create(NULL, NULL, PROV_RSA_AES, CRYPT_VERIFYCONTEXT))
            throw win_runtime_error(__FUNCTION__ " CryptAcquireContext failed.");

        m_password = m_module.decrypt_str<char_traits<wchar_t>, sanitizing_allocator<wchar_t> >(cp, password_enc.data(), password_enc.size());
        m_enc_alg  = enc_alg_t::native;
    } else if (encryption && CompareStringEx(LOCALE_NAME_INVARIANT, NORM_IGNORECASE, encryption, encryption.length(), _L(PRODUCT_NAME_STR), -1, NULL, NULL, 0) == CSTR_EQUAL) {
        // Decode Base64.
        winstd::base64_dec dec;
        bool is_last;
        vector<unsigned char> password_enc;
        dec.decode(password_enc, is_last, (BSTR)password, password.length());

        // Prepare cryptographics provider.
        crypt_prov cp;
        if (!cp.create(NULL, NULL, PROV_RSA_AES, CRYPT_VERIFYCONTEXT))
            throw win_runtime_error(__FUNCTION__ " CryptAcquireContext failed.");

        #pragma warning(suppress: 4996) // Support for backward compatibility.
        m_password = m_module.decrypt_str_md5<char_traits<wchar_t>, sanitizing_allocator<wchar_t> >(cp, password_enc.data(), password_enc.size());
        m_enc_alg  = enc_alg_t::native_v1;
    } else if (encryption && CompareStringEx(LOCALE_NAME_INVARIANT, NORM_IGNORECASE, encryption, encryption.length(), _L("KPH"), -1, NULL, NULL, 0) == CSTR_EQUAL) {
        // Decrypt password.
        sanitizing_string password_utf8(std::move(kph_decrypt<OLECHAR>(password)));
        MultiByteToWideChar(CP_UTF8, 0, password_utf8, m_password);
        m_enc_alg = enc_alg_t::kph;
    } else if (encryption && encryption[0]) {
        // Encryption is defined but unrecognized.
        throw invalid_argument(string_printf(__FUNCTION__ " Unsupported <Password> encryption method (encryption: %ls).", (BSTR)encryption));
    } else {
        m_password = password;
        m_enc_alg  = enc_alg_t::none;
        SecureZeroMemory((BSTR)password, sizeof(OLECHAR)*password.length());
    }

    m_module.log_config_discrete((xpath + L"/Password").c_str(), m_password.c_str());
}


void eap::credentials_pass::operator<<(_Inout_ cursor_out &cursor) const
{
    credentials::operator<<(cursor);
    cursor << m_password;
    cursor << m_enc_alg ;
}


size_t eap::credentials_pass::get_pk_size() const
{
    return
        credentials::get_pk_size() +
        pksizeof(m_password) +
        pksizeof(m_enc_alg );
}


void eap::credentials_pass::operator>>(_Inout_ cursor_in &cursor)
{
    credentials::operator>>(cursor);
    cursor >> m_password;
    cursor >> m_enc_alg ;
}


void eap::credentials_pass::store(_In_z_ LPCTSTR pszTargetName, _In_ unsigned int level) const
{
    assert(pszTargetName);

    // Convert password to UTF-8.
    sanitizing_string cred_utf8;
    WideCharToMultiByte(CP_UTF8, 0, m_password, cred_utf8, NULL, NULL);

    // Encrypt the password using user's key.
    DATA_BLOB cred_blob    = { (DWORD)cred_utf8.size() , const_cast<LPBYTE>(reinterpret_cast<LPCBYTE>(cred_utf8.data())) };
    DATA_BLOB entropy_blob = {        sizeof(s_entropy), const_cast<LPBYTE>(                          s_entropy        ) };
    data_blob cred_enc;
    if (!CryptProtectData(&cred_blob, NULL, &entropy_blob, NULL, NULL, CRYPTPROTECT_UI_FORBIDDEN | CRYPTPROTECT_AUDIT, &cred_enc))
        throw win_runtime_error(__FUNCTION__ " CryptProtectData failed.");

    tstring target(target_name(pszTargetName, level));

    // Write credentials.
    assert(cred_enc.cbData     < CRED_MAX_CREDENTIAL_BLOB_SIZE);
    assert(m_identity.length() < CRED_MAX_USERNAME_LENGTH     );
    CREDENTIAL cred = {
        0,                                     // Flags
        CRED_TYPE_GENERIC,                     // Type
        const_cast<LPTSTR>(target.c_str()),    // TargetName
        _T(""),                                // Comment
        { 0, 0 },                              // LastWritten
        cred_enc.cbData,                       // CredentialBlobSize
        cred_enc.pbData,                       // CredentialBlob
        CRED_PERSIST_ENTERPRISE,               // Persist
        0,                                     // AttributeCount
        NULL,                                  // Attributes
        NULL,                                  // TargetAlias
        const_cast<LPTSTR>(m_identity.c_str()) // UserName
    };
    if (!CredWrite(&cred, 0))
        throw win_runtime_error(__FUNCTION__ " CredWrite failed.");
}


void eap::credentials_pass::retrieve(_In_z_ LPCTSTR pszTargetName, _In_ unsigned int level)
{
    assert(pszTargetName);

    // Read credentials.
    unique_ptr<CREDENTIAL, CredFree_delete<CREDENTIAL> > cred;
    if (!CredRead(target_name(pszTargetName, level).c_str(), CRED_TYPE_GENERIC, 0, (PCREDENTIAL*)&cred))
        throw win_runtime_error(__FUNCTION__ " CredRead failed.");

    // Decrypt the password using user's key.
    DATA_BLOB cred_enc     = { cred->CredentialBlobSize, cred->CredentialBlob          };
    DATA_BLOB entropy_blob = { sizeof(s_entropy)       , const_cast<LPBYTE>(s_entropy) };
    data_blob cred_int;
    if (!CryptUnprotectData(&cred_enc, NULL, &entropy_blob, NULL, NULL, CRYPTPROTECT_UI_FORBIDDEN | CRYPTPROTECT_VERIFY_PROTECTION, &cred_int))
        throw win_runtime_error(__FUNCTION__ " CryptUnprotectData failed.");

    // Convert password from UTF-8.
    MultiByteToWideChar(CP_UTF8, 0, reinterpret_cast<LPCSTR>(cred_int.pbData), (int)cred_int.cbData, m_password);
    SecureZeroMemory(cred_int.pbData, cred_int.cbData);

    if (cred->UserName)
        m_identity = cred->UserName;
    else
        m_identity.clear();

    wstring xpath(pszTargetName);
    m_module.log_config((xpath + L"/Identity").c_str(), m_identity.c_str());
    m_module.log_config_discrete((xpath + L"/Password").c_str(), m_password.c_str());
}


LPCTSTR eap::credentials_pass::target_suffix() const
{
    return _T("pass");
}


eap::credentials::source_t eap::credentials_pass::combine(
    _In_             DWORD         dwFlags,
    _In_opt_   const credentials   *cred_cached,
    _In_       const config_method &cfg,
    _In_opt_z_       LPCTSTR       pszTargetName)
{
    UNREFERENCED_PARAMETER(dwFlags);

    if (cred_cached) {
        // Using EAP service cached credentials.
        *this = *dynamic_cast<const credentials_pass*>(cred_cached);
        m_module.log_event(&EAPMETHOD_TRACE_EVT_CRED_CACHED2, event_data((unsigned int)cfg.get_method_id()), event_data(credentials_pass::get_name()), event_data(pszTargetName), event_data::blank);
        return source_t::cache;
    }

    auto cfg_with_cred = dynamic_cast<const config_method_with_cred*>(&cfg);
    if (cfg_with_cred && cfg_with_cred->m_use_cred) {
        // Using configured credentials.
        *this = *dynamic_cast<const credentials_pass*>(cfg_with_cred->m_cred.get());
        m_module.log_event(&EAPMETHOD_TRACE_EVT_CRED_CONFIG2, event_data((unsigned int)cfg.get_method_id()), event_data(credentials_pass::get_name()), event_data(pszTargetName), event_data::blank);
        return source_t::config;
    }

    if (pszTargetName) {
        try {
            credentials_pass cred_loaded(m_module);
            cred_loaded.retrieve(pszTargetName, cfg.m_level);

            // Using stored credentials.
            *this = std::move(cred_loaded);
            m_module.log_event(&EAPMETHOD_TRACE_EVT_CRED_STORED2, event_data((unsigned int)cfg.get_method_id()), event_data(credentials_pass::get_name()), event_data(pszTargetName), event_data::blank);
            return source_t::storage;
        } catch (...) {
            // Not actually an error.
        }
    }

    return source_t::unknown;
}


/// \cond internal
const unsigned char eap::credentials_pass::s_entropy[1024] = {
    0x40, 0x88, 0xd3, 0x13, 0x81, 0x8a, 0xf6, 0x74, 0x55, 0x8e, 0xcc, 0x73, 0x2c, 0xf8, 0x93, 0x37,
    0x4f, 0xeb, 0x1d, 0x66, 0xb7, 0xfb, 0x47, 0x75, 0xb4, 0xfd, 0x07, 0xbb, 0xf6, 0xb3, 0x05, 0x30,
    0x4a, 0xc0, 0xff, 0x05, 0xbd, 0x1e, 0x2f, 0x55, 0xc8, 0x77, 0x70, 0x47, 0xc9, 0x85, 0x57, 0x22,
    0x8e, 0x54, 0x0b, 0x4d, 0x26, 0x80, 0x11, 0x0c, 0x52, 0x55, 0xc2, 0x3b, 0x9b, 0xd2, 0x19, 0x61,
    0xf1, 0x71, 0xf5, 0x4b, 0x49, 0x73, 0xf9, 0x6d, 0x44, 0xd2, 0x90, 0x92, 0x2d, 0xae, 0xc6, 0xbb,
    0x3d, 0xfe, 0x52, 0x47, 0x82, 0xc1, 0xa9, 0xe1, 0x6a, 0xd1, 0xd2, 0x4e, 0x3d, 0x9b, 0x4e, 0xc0,
    0x40, 0x36, 0x79, 0xd3, 0x88, 0xfc, 0x0b, 0x79, 0x8c, 0xb2, 0x9d, 0x74, 0x13, 0x29, 0x59, 0x0c,
    0xe0, 0x87, 0x34, 0x7d, 0xc1, 0x30, 0xd4, 0xe9, 0x98, 0xd1, 0x3f, 0x82, 0xcb, 0x8b, 0x44, 0x09,
    0x2d, 0xc5, 0x9e, 0x3d, 0x66, 0xe5, 0x1a, 0x9d, 0xa6, 0x87, 0x20, 0x7f, 0x55, 0xd7, 0x89, 0xf2,
    0xbb, 0x5f, 0x00, 0xf9, 0x38, 0xd3, 0x49, 0x10, 0x6f, 0x3a, 0xab, 0x5d, 0x8f, 0x73, 0x8c, 0xbc,
    0x6f, 0xf1, 0xef, 0x83, 0x43, 0xcb, 0xc9, 0xb7, 0x9f, 0x24, 0xe4, 0x91, 0x3a, 0xe6, 0xab, 0x6c,
    0xf2, 0xfd, 0x66, 0xf0, 0xb1, 0x1a, 0xc8, 0xc4, 0x6b, 0x9d, 0xa7, 0x10, 0x7d, 0x30, 0x29, 0x1b,
    0xe5, 0xfe, 0x1c, 0x97, 0x86, 0x1e, 0x80, 0xe5, 0x12, 0x0a, 0x2a, 0x0d, 0xd9, 0x4a, 0x35, 0xe5,
    0xab, 0xdf, 0x61, 0x76, 0x4e, 0x36, 0xff, 0xb1, 0x26, 0x5e, 0x12, 0x7f, 0xdf, 0xd7, 0x98, 0x55,
    0xf9, 0x89, 0x30, 0xcc, 0xe9, 0xf6, 0xd0, 0xc0, 0x69, 0xf4, 0x78, 0x81, 0x10, 0xeb, 0x34, 0xf3,
    0x5a, 0x8a, 0x62, 0xd4, 0x97, 0xe6, 0xb7, 0x98, 0x86, 0x5f, 0xb6, 0xcb, 0x9c, 0xab, 0xd6, 0xe9,
    0xda, 0x2b, 0x41, 0xbb, 0xa3, 0x37, 0x1f, 0x7d, 0x4e, 0x19, 0x13, 0xc3, 0xab, 0x23, 0x4d, 0xa6,
    0x51, 0xa9, 0x07, 0x60, 0xb9, 0x0c, 0x49, 0xce, 0x40, 0x29, 0x15, 0x0d, 0x10, 0xde, 0xc9, 0x0c,
    0x11, 0x91, 0xdc, 0xdf, 0xc8, 0xac, 0x13, 0xe5, 0xe9, 0x11, 0xdc, 0x47, 0xb7, 0xb3, 0xf5, 0xd0,
    0xc4, 0x38, 0x10, 0x17, 0xf7, 0x93, 0x93, 0x6b, 0x56, 0x10, 0xc6, 0xa6, 0x4c, 0xf8, 0x9c, 0x52,
    0xb7, 0xbd, 0x87, 0xe8, 0xff, 0x84, 0x01, 0xbb, 0x40, 0x84, 0x03, 0x19, 0x6f, 0xf7, 0x46, 0x6f,
    0x10, 0xc0, 0x85, 0xdf, 0xfd, 0xad, 0x00, 0xf6, 0xd5, 0x05, 0x22, 0xf4, 0x28, 0x87, 0xf6, 0x0c,
    0xca, 0xda, 0x9a, 0x67, 0x63, 0xa4, 0x2d, 0x4d, 0xa5, 0x06, 0xa1, 0x8b, 0x32, 0x9b, 0xb0, 0xed,
    0x05, 0x8e, 0x36, 0xa4, 0xbe, 0xa0, 0x9c, 0x78, 0xfa, 0x2c, 0x9e, 0x99, 0x02, 0x50, 0x63, 0xd4,
    0xd5, 0x4a, 0x9b, 0xc3, 0x81, 0x95, 0xab, 0x18, 0x47, 0x3d, 0x44, 0x15, 0x33, 0x79, 0xd0, 0x53,
    0x4e, 0xfc, 0x2f, 0x66, 0xc9, 0x7c, 0xb9, 0xda, 0xa2, 0xce, 0xfa, 0x39, 0xea, 0x72, 0x2c, 0xe2,
    0x5c, 0x1f, 0x7e, 0xcd, 0x2a, 0x3e, 0x11, 0x19, 0x06, 0xc7, 0x03, 0x89, 0x4c, 0xd3, 0x73, 0xea,
    0xa5, 0x69, 0x1e, 0x68, 0x04, 0xcd, 0xbb, 0xc4, 0x74, 0x7b, 0x1e, 0x75, 0x6f, 0xf1, 0x89, 0xea,
    0x21, 0xdf, 0x9e, 0x1b, 0x27, 0x4a, 0x20, 0xb4, 0x5b, 0x72, 0x68, 0x8e, 0x47, 0xe2, 0x18, 0x75,
    0x36, 0x82, 0xae, 0xa9, 0xa9, 0x40, 0xe5, 0x19, 0xa7, 0xea, 0x48, 0xad, 0x26, 0x7c, 0x93, 0x3e,
    0xbf, 0x48, 0x6c, 0x3e, 0x66, 0xf7, 0x3c, 0x8f, 0x3c, 0x0e, 0x77, 0xc8, 0xb5, 0x56, 0x3b, 0x3a,
    0x25, 0x13, 0x49, 0xb4, 0xcc, 0xbb, 0x8e, 0x94, 0x73, 0xa4, 0x35, 0x16, 0x95, 0x74, 0xa5, 0x98,
    0xa4, 0x61, 0xa2, 0x36, 0xaf, 0x7f, 0xdf, 0x04, 0xce, 0x34, 0xd3, 0xfc, 0x09, 0x83, 0x43, 0xc1,
    0x7a, 0x22, 0xc7, 0xfa, 0x3d, 0x97, 0xce, 0xc0, 0xcd, 0x15, 0xa4, 0x97, 0xb4, 0xd4, 0x55, 0x51,
    0xf1, 0xef, 0x81, 0x1a, 0xce, 0x1f, 0x5a, 0x2d, 0xba, 0xce, 0xec, 0xbd, 0x85, 0x57, 0x53, 0xc6,
    0x2f, 0x2a, 0x84, 0xab, 0xf3, 0x6e, 0x3b, 0xac, 0xf8, 0x73, 0xf2, 0x20, 0x42, 0x6f, 0xc4, 0xe2,
    0x20, 0xb7, 0xf8, 0x5e, 0xbd, 0xe7, 0xd2, 0x2b, 0xe6, 0x10, 0xc2, 0x66, 0xe7, 0x25, 0xf9, 0xb9,
    0xcb, 0xe4, 0x85, 0xbd, 0xf9, 0x62, 0x10, 0xfd, 0x67, 0x8f, 0x3f, 0x15, 0x4b, 0x10, 0x9e, 0xde,
    0x8a, 0x9c, 0xb5, 0x46, 0xb7, 0x96, 0xa8, 0x9d, 0xe8, 0xf1, 0xde, 0x34, 0xcf, 0x4c, 0xa4, 0xe6,
    0x35, 0x24, 0xcf, 0x47, 0xc5, 0x2d, 0xf2, 0xe3, 0x15, 0xf3, 0x39, 0xb7, 0x45, 0x2c, 0x92, 0x23,
    0x37, 0x28, 0xfa, 0x7b, 0x7b, 0xe9, 0xc3, 0x04, 0x57, 0x0c, 0x30, 0xab, 0x52, 0x3a, 0x1d, 0xf7,
    0x3a, 0x7b, 0xa0, 0xf0, 0x22, 0x14, 0xa8, 0xc7, 0x4e, 0xd5, 0x8b, 0x9a, 0xac, 0x67, 0x33, 0x0a,
    0xa2, 0xa4, 0x76, 0x65, 0x45, 0x48, 0x7d, 0x92, 0xd7, 0xdb, 0xb1, 0x51, 0xae, 0x5f, 0x95, 0x1c,
    0x8c, 0xe0, 0xaa, 0x28, 0x72, 0xbb, 0x2d, 0x97, 0x65, 0xfb, 0x3f, 0x41, 0x06, 0x46, 0xd1, 0x8c,
    0x99, 0x64, 0x0e, 0xc7, 0xf0, 0x82, 0x1f, 0x1e, 0x5e, 0x8a, 0xc8, 0x6e, 0x29, 0xf0, 0xa8, 0x38,
    0xa5, 0x38, 0x12, 0xaa, 0x9d, 0x60, 0x3d, 0x40, 0xfc, 0x29, 0x17, 0xc5, 0xe1, 0x1d, 0xba, 0x14,
    0x45, 0xf0, 0x16, 0x32, 0x8f, 0x37, 0x88, 0xad, 0x7c, 0x77, 0x57, 0x06, 0x89, 0x70, 0x1f, 0x0e,
    0x88, 0x9d, 0x2b, 0x5f, 0x83, 0x69, 0xb0, 0x48, 0x03, 0x86, 0xe4, 0x2e, 0x1c, 0xfb, 0x85, 0xb1,
    0xce, 0x1c, 0x0e, 0xe0, 0xd4, 0x17, 0x0f, 0xb2, 0xf1, 0x79, 0xde, 0x8f, 0xd2, 0x0a, 0xa5, 0x10,
    0xee, 0x9e, 0x05, 0x57, 0x0d, 0x42, 0x21, 0xaa, 0x53, 0xb1, 0x53, 0xd9, 0x59, 0x8b, 0x43, 0x22,
    0x82, 0xbe, 0xa3, 0x2a, 0x79, 0x89, 0x46, 0xc4, 0x18, 0x31, 0x3e, 0xd4, 0x3d, 0x79, 0x9b, 0x06,
    0xde, 0x7e, 0xe5, 0x20, 0xdd, 0xae, 0x34, 0xa8, 0x31, 0xc2, 0xdf, 0x61, 0x6d, 0x1b, 0x47, 0xc4,
    0xae, 0x25, 0x44, 0xa8, 0x79, 0x5c, 0x2b, 0x4a, 0x17, 0x6e, 0x7a, 0xe5, 0xf1, 0x48, 0x3f, 0x82,
    0x24, 0x6a, 0xc5, 0xc1, 0xfc, 0x65, 0x61, 0xca, 0xe4, 0x89, 0x52, 0x14, 0xe4, 0xb3, 0x7a, 0x24,
    0xc2, 0xe5, 0x59, 0x1d, 0x55, 0xa3, 0x95, 0x16, 0xe2, 0xcf, 0x07, 0xd8, 0xad, 0x9c, 0x30, 0xbe,
    0x96, 0xee, 0x80, 0x54, 0x63, 0xe7, 0xd4, 0xa6, 0xac, 0xe8, 0x15, 0xd4, 0xfc, 0x7b, 0xf8, 0xee,
    0x0e, 0x88, 0x51, 0xd9, 0xad, 0x6f, 0x0d, 0xea, 0x19, 0x3a, 0x1a, 0x20, 0xbc, 0x99, 0x59, 0xcc,
    0xba, 0x19, 0xc8, 0x26, 0x79, 0x79, 0xe8, 0xf6, 0x3f, 0xa0, 0xdb, 0xa6, 0x52, 0x4d, 0xc0, 0x98,
    0x22, 0xcf, 0x30, 0xae, 0xdf, 0x22, 0x94, 0x5c, 0x19, 0x01, 0xe3, 0xf0, 0x44, 0x23, 0xe5, 0xeb,
    0x70, 0x1a, 0xd2, 0x7f, 0xe8, 0x91, 0x1b, 0x55, 0xe7, 0xcb, 0x0d, 0xc2, 0x53, 0xa0, 0xe6, 0x7a,
    0x48, 0xab, 0x05, 0xbb, 0x55, 0x28, 0x98, 0x12, 0xe5, 0xd1, 0xd9, 0x44, 0xe9, 0xa8, 0x8d, 0xa4,
    0x68, 0xc8, 0x21, 0xa8, 0xe9, 0x49, 0x46, 0x22, 0xce, 0x81, 0xfe, 0x4a, 0xe3, 0xa0, 0x1c, 0xb0,
    0x30, 0x29, 0x39, 0x9a, 0xd6, 0xab, 0x2e, 0xc6, 0x42, 0x47, 0x5e, 0x54, 0xbb, 0x90, 0xe6, 0x98,
    0xe6, 0x52, 0x58, 0x58, 0x1e, 0xd0, 0x00, 0x9c, 0x8f, 0x4a, 0x17, 0x7e, 0x8a, 0x5a, 0xef, 0x3e,
};
/// \endcond


//////////////////////////////////////////////////////////////////////
// eap::credentials_connection
//////////////////////////////////////////////////////////////////////

eap::credentials_connection::credentials_connection(_In_ module &mod, _In_ const config_connection &cfg) :
    m_cfg(cfg),
    config(mod)
{
}


eap::credentials_connection::credentials_connection(_In_ const credentials_connection &other) :
    m_cfg      (other.m_cfg                                                               ),
    m_namespace(other.m_namespace                                                         ),
    m_id       (other.m_id                                                                ),
    m_cred     (other.m_cred ? dynamic_cast<credentials*>(other.m_cred->clone()) : nullptr),
    config     (other                                                                     )
{
}


eap::credentials_connection::credentials_connection(_Inout_ credentials_connection &&other) noexcept :
    m_cfg      (          other.m_cfg       ),
    m_namespace(std::move(other.m_namespace)),
    m_id       (std::move(other.m_id       )),
    m_cred     (std::move(other.m_cred     )),
    config     (std::move(other            ))
{
}


eap::credentials_connection& eap::credentials_connection::operator=(_In_ const credentials_connection &other)
{
    if (this != &other) {
        (config&)*this = other;
        m_namespace    = other.m_namespace;
        m_id           = other.m_id;
        m_cred.reset(other.m_cred ? dynamic_cast<credentials*>(other.m_cred->clone()) : nullptr);
    }

    return *this;
}


eap::credentials_connection& eap::credentials_connection::operator=(_Inout_ credentials_connection &&other) noexcept
{
    if (this != &other) {
        (config&)*this = std::move(other            );
        m_namespace    = std::move(other.m_namespace);
        m_id           = std::move(other.m_id       );
        m_cred         = std::move(other.m_cred     );
    }

    return *this;
}


eap::config* eap::credentials_connection::clone() const
{
    return new credentials_connection(*this);
}


void eap::credentials_connection::save(_In_ IXMLDOMDocument *pDoc, _In_ IXMLDOMNode *pConfigRoot) const
{
    assert(pDoc);
    assert(pConfigRoot);

    config::save(pDoc, pConfigRoot);

    HRESULT hr;

    // Create <EAPIdentityProvider> node.
    com_obj<IXMLDOMElement> pXmlElIdentityProvider;
    if (FAILED(hr = eapxml::create_element(pDoc, pConfigRoot, bstr(L"eap-metadata:EAPIdentityProvider"), bstr(L"EAPIdentityProvider"), namespace_eapmetadata, pXmlElIdentityProvider)))
        throw com_runtime_error(hr, __FUNCTION__ " Error creating <EAPIdentityProvider> element.");

    // namespace
    if (!m_namespace.empty())
        if (FAILED(hr = eapxml::put_attrib_value(pXmlElIdentityProvider, bstr(L"namespace"), bstr(m_namespace))))
            throw com_runtime_error(hr, __FUNCTION__ " Error creating namespace attribute.");

    // ID
    if (!m_id.empty())
        if (FAILED(hr = eapxml::put_attrib_value(pXmlElIdentityProvider, bstr(L"ID"), bstr(m_id))))
            throw com_runtime_error(hr, __FUNCTION__ " Error creating ID attribute.");

    m_cred->save(pDoc, pXmlElIdentityProvider);
}


void eap::credentials_connection::load(_In_ IXMLDOMNode *pConfigRoot)
{
    assert(pConfigRoot);
    HRESULT hr;

    config::load(pConfigRoot);

    // <EAPIdentityProvider>
    com_obj<IXMLDOMElement> pXmlElClientSideCredential;
    if (FAILED(hr = eapxml::select_element(pConfigRoot, bstr(L"eap-metadata:EAPIdentityProvider"), pXmlElClientSideCredential)))
        throw com_runtime_error(hr, __FUNCTION__ " Error loading <EAPIdentityProvider> element.");

    wstring xpath(eapxml::get_xpath(pXmlElClientSideCredential));

    // namespace
    m_namespace.clear();
    eapxml::get_attrib_value(pXmlElClientSideCredential, bstr(L"namespace"), m_namespace);
    m_module.log_config((xpath + L" namespace").c_str(), m_namespace.c_str());

    // ID
    m_id.clear();
    eapxml::get_attrib_value(pXmlElClientSideCredential, bstr(L"ID"), m_id);
    m_module.log_config((xpath + L" ID").c_str(), m_id.c_str());

    // Look-up the provider.
    for (auto cfg_prov = m_cfg.m_providers.cbegin(), cfg_prov_end = m_cfg.m_providers.cend(); ; ++cfg_prov) {
        if (cfg_prov != cfg_prov_end) {
            if (match(*cfg_prov)) {
                // Matching provider found. Create matching blank credential set, then load.
                if (cfg_prov->m_methods.empty())
                    throw invalid_argument(string_printf(__FUNCTION__ " %ls provider has no methods.", cfg_prov->get_id().c_str()));
                m_cred.reset(cfg_prov->m_methods.front().get()->make_credentials());
                m_cred->load(pXmlElClientSideCredential);
                break;
            }
        } else
            throw invalid_argument(string_printf(__FUNCTION__ " Credentials do not match to any provider within this connection configuration (provider: %ls).", get_id().c_str()));
    }
}


void eap::credentials_connection::operator<<(_Inout_ cursor_out &cursor) const
{
    config::operator<<(cursor);
    cursor <<  m_namespace;
    cursor <<  m_id       ;
    cursor << *m_cred     ;
}


size_t eap::credentials_connection::get_pk_size() const
{
    return
        config::get_pk_size() +
        pksizeof( m_namespace) +
        pksizeof( m_id       ) +
        pksizeof(*m_cred     );
}


void eap::credentials_connection::operator>>(_Inout_ cursor_in &cursor)
{
    config::operator>>(cursor);
    cursor >> m_namespace;
    cursor >> m_id       ;

    // Look-up the provider.
    for (auto cfg_prov = m_cfg.m_providers.cbegin(), cfg_prov_end = m_cfg.m_providers.cend(); ; ++cfg_prov) {
        if (cfg_prov != cfg_prov_end) {
            if (match(*cfg_prov)) {
                // Matching provider found. Create matching blank credential set, then read.
                if (cfg_prov->m_methods.empty())
                    throw invalid_argument(string_printf(__FUNCTION__ " %ls provider has no methods.", cfg_prov->get_id().c_str()));
                m_cred.reset(cfg_prov->m_methods.front().get()->make_credentials());
                cursor >> *m_cred;
                break;
            }
        } else
            throw invalid_argument(string_printf(__FUNCTION__ " Credentials do not match to any provider within this connection configuration (provider: %ls).", get_id().c_str()));
    }
}


//////////////////////////////////////////////////////////////////////
// kph_gen_cyro_key
//////////////////////////////////////////////////////////////////////

inline static unsigned char kph_gen_cyro_key(_In_ int keycode, _In_ size_t index)
{
    // Initialize seed.
    int seed = (keycode / 1000)* 100000;
    keycode = seed * seed;

    // Iterate seeding.
    for (size_t i = 0; i <= index; i++) {
        seed = (keycode / 1000)* 100000;
        keycode = seed * seed;
    }

    return ((keycode >> 8) + (keycode & 0xff)) & 0xff;
}


//////////////////////////////////////////////////////////////////////
// kph_encode
//////////////////////////////////////////////////////////////////////

template<class _Elem, class _Traits, class _Ax>
inline static basic_string<_Elem, _Traits, _Ax> kph_encode(_In_ unsigned char data)
{
    // Encode one byte of data.
    _Elem str[3] = {
        static_cast<_Elem>('A' + (data >> 4       )),
        static_cast<_Elem>('a' + (data      & 0x0f)),
    };
    return str;
} 


//////////////////////////////////////////////////////////////////////
// kph_decode
//////////////////////////////////////////////////////////////////////

template<class _Elem>
inline static unsigned char kph_decode(_In_ const _Elem str[2])
{
    // Decode one byte of data.
    return
        (((unsigned char)str[0] - 'A') << 4) |
        (((unsigned char)str[1] - 'a')     );
}


//////////////////////////////////////////////////////////////////////
// kph_encrypt
//////////////////////////////////////////////////////////////////////

template<class _Elem, class _Traits, class _Ax>
inline static basic_string<_Elem, _Traits, _Ax> kph_encrypt(_In_ HCRYPTPROV hProv, _In_z_ const char *src)
{
    basic_string<_Elem, _Traits, _Ax> str;
    unsigned short key[8] = { 0 };

    // Generate the key.
    if (!CryptGenRandom(hProv, sizeof(key), (BYTE*)key))
        throw win_runtime_error(__FUNCTION__ " Error generating key.");

    // Write the key.
    for (int i = 0; i < 8; i++) {
        str += kph_encode<_Elem, _Traits, _Ax>((key[i] >> 8) & 0xff);
        str += kph_encode<_Elem, _Traits, _Ax>((key[i]     ) & 0xff);
    }

    // Encrypt source.
    for (size_t k = 1; *src; k++, src++) {
        unsigned char p = (unsigned char)*src;
        for (int i = 0; i < 8; i++)
            p ^= kph_gen_cyro_key(key[i], k);
        str += kph_encode<_Elem, _Traits, _Ax>(p);
    }

    return str;
}


//////////////////////////////////////////////////////////////////////
// kph_decrypt
//////////////////////////////////////////////////////////////////////

template<class _Elem>
inline static sanitizing_string kph_decrypt(_In_z_ const _Elem *src)
{
    sanitizing_string str;
    unsigned short key[8];

    // Restore key.
    for(int i = 0; i < 8; i++, src += 4) {
        if (!src[0] || !src[1] || !src[2] || !src[3])
            throw invalid_argument(__FUNCTION__ " Source is incomplete.");
        key[i] =
            ((unsigned short)kph_decode(src    ) << 8) |
            ((unsigned short)kph_decode(src + 2)     );
    }

    for (size_t k = 1; *src; k++, src += 2) {
        if (!src[0] || !src[1])
            throw invalid_argument(__FUNCTION__ " Source is incomplete.");
        unsigned char p = kph_decode(src);
        for(int i = 0; i < 8; i++)
            p ^= kph_gen_cyro_key(key[i], k);
        str += (char)p;
    }

    return str;
}