encrypt-and-sign/src/main.c

/*---------------------------------------------------------------------------*
  Project:  TwlSDK - aes - demos - encrypt-and-sign
  File:     main.c

  Copyright 2007-2008 Nintendo. All rights reserved.

  These coded instructions, statements, and computer programs contain
  proprietary information of Nintendo of America Inc. and/or Nintendo
  Company Ltd., and are protected by Federal copyright law. They may
  not be disclosed to third parties or copied or duplicated in any form,
  in whole or in part, without the prior written consent of Nintendo.

  $Date:: 2008-12-08#$
  $Rev: 9567 $
  $Author: hatamoto_minoru $
 *---------------------------------------------------------------------------*/
#include <twl.h>
#include <twl/aes.h>


/*---------------------------------------------------------------------------*
    Declare internal variables
 *---------------------------------------------------------------------------*/

// Message queue used for waiting for the end of AES processing
#define DEMO_MESSAGE_Q_SIZE     1
static OSMessageQueue   sMsgQ;
static OSMessage        sMsgQBuffer[DEMO_MESSAGE_Q_SIZE];

// Sample data to encrypt
static const char DEMO_TEXT[] =
    "These coded instructions, statements, and computer programs contain "
    "proprietary information of Nintendo of America Inc. and/or Nintendo "
    "Company Ltd., and are protected by Federal copyright law.  They may "
    "not be disclosed to third parties or copied or duplicated in any form, "
    "in whole or in part, without the prior written consent of Nintendo.";

// Appropriate key to use for encryption
static const AESKey DEMO_KEY =
    { 0xb3,0x2f,0x3a,0x91,0xe6,0x98,0xc2,0x76,
      0x70,0x6d,0xfd,0x71,0xbc,0xdd,0xb3,0x93, };


/*---------------------------------------------------------------------------*
    Internal function declarations
 *---------------------------------------------------------------------------*/

static void         DEMO_InitInteruptSystem(void);
static void         DEMO_InitAllocSystem(void);
static void         DEMO_AESCallback(AESResult result, void* arg);
static AESResult    DEMO_WaitAes(OSMessageQueue* pQ);
static void         DEMO_PrintBytes(const void* pvoid, u32 size);


/*---------------------------------------------------------------------------*
    Function definitions
 *---------------------------------------------------------------------------*/

/*---------------------------------------------------------------------------*
  Name:         SampleMain

  Description:  The main body of the sample.

  Arguments:    None.

  Returns:      Whether sample processing succeeded.
 *---------------------------------------------------------------------------*/
static BOOL SampleMain(void)
{
    BOOL bSuccess = FALSE;

    AESResult aesResult;
    const char* pPlainText = DEMO_TEXT;
    void* pEncrypted;
    void* pDecrypted;
    u32 plainSize;
    u32 cipherSize;

    // Initialize the message queue for waiting on AES processing
    OS_InitMessageQueue(&sMsgQ, sMsgQBuffer, DEMO_MESSAGE_Q_SIZE);

    // Allocate the buffer to store encrypted/decrypted data.
    // The encrypted data will increase in size by exactly the amount of AES_SIGN_HEADER_SIZE.
    plainSize = (u32)STD_GetStringLength(pPlainText) + 1;
    cipherSize = plainSize + AES_SIGN_HEADER_SIZE;
    pEncrypted = OS_Alloc(cipherSize);
    pDecrypted = OS_Alloc(plainSize);

    if( ! SDK_IS_VALID_POINTER(pEncrypted)
     || ! SDK_IS_VALID_POINTER(pDecrypted) )
    {
        OS_TPrintf("fail to OS_Alloc\n");
        return FALSE;
    }

    // The first AES function to call must be AES_Init
    AES_Init();

    // Configure the encryption key
    aesResult = AES_SetKey(&DEMO_KEY);
    if( aesResult != AES_RESULT_SUCCESS )
    {
        OS_TPrintf("AES_SetKey failed(%d)\n", aesResult);
        goto error_exit;
    }


    // Display parameters
    OS_TPrintf("---- parameter -----------\n");
    OS_TPrintf("-- key\n");
    DEMO_PrintBytes(&DEMO_KEY, sizeof(DEMO_KEY));


    // Encryption
    {
        // Performs encryption in AES CCM Mode
        aesResult = AES_EncryptAndSign(
                        pPlainText,         // Data to be encrypted
                        plainSize,          // Size of the data to encrypt
                        pEncrypted,         // Buffer that stores encrypted data
                        DEMO_AESCallback,   // Callback called at completion
                        &sMsgQ );           // Callback parameters
        if( aesResult != AES_RESULT_SUCCESS )
        {
            OS_TPrintf("AES_EncryptAndSign failed(%d)\n", aesResult);
            goto error_exit;
        }

        // Wait for encryption to end
        aesResult = DEMO_WaitAes(&sMsgQ);
        if( aesResult != AES_RESULT_SUCCESS )
        {
            OS_TPrintf("AES_EncryptAndSign failed(%d)\n", aesResult);
            goto error_exit;
        }


        // Display results
        OS_TPrintf("---- encrypt -------------\n");
        OS_TPrintf("-- plain text (ascii)\n");
        OS_PutString(pPlainText);   // Use OS_PutString because OS_*Printf has a limit of 256 characters
        OS_TPrintf("\n");

        OS_TPrintf("-- plain text (hex)\n");
        DEMO_PrintBytes(pPlainText, plainSize);

        OS_TPrintf("-- encrypted (hex)\n");
        DEMO_PrintBytes(pEncrypted, cipherSize);
    }

    // Decryption
    {
        // Performs decryption in AES CCM Mode
        aesResult = AES_DecryptAndVerify(
                        pEncrypted,         // Data to be decrypted
                        cipherSize,         // Size of the data to decrypt
                        pDecrypted,         // Buffer that stores decrypted data
                        DEMO_AESCallback,   // Callback called at completion
                        &sMsgQ );           // Callback parameters
        if( aesResult != AES_RESULT_SUCCESS )
        {
            OS_TPrintf("AES_DecryptAndVerify failed(%d)\n", aesResult);
            goto error_exit;
        }

        // Wait for decryption to end
        aesResult = DEMO_WaitAes(&sMsgQ);

        // If the encrypted data has been falsified, the aesResult obtained here is AES_RESULT_VERIFICATION_FAILED
        //
        if( aesResult != AES_RESULT_SUCCESS )
        {
            OS_TPrintf("AES_DecryptAndVerify failed(%d)\n", aesResult);
            goto error_exit;
        }


        // Display results
        OS_TPrintf("---- decrypt -------------\n");
        OS_TPrintf("-- encrypted (hex)\n");
        DEMO_PrintBytes(pEncrypted, cipherSize);

        OS_TPrintf("-- decrypted (hex)\n");
        DEMO_PrintBytes(pDecrypted, plainSize);

        OS_TPrintf("-- decrypted (ascii)\n");
        OS_PutString(pDecrypted);   // Use OS_PutString because OS_*Printf has a limit of 256 characters
        OS_TPrintf("\n");
    }

    // Confirm that data that was encrypted, then decrypted, matches original
    if( MI_CpuComp8(pDecrypted, pPlainText, plainSize) == 0 )
    {
        OS_TPrintf("** pDecrypted == pPlainText\n");
        bSuccess = TRUE;
    }
    else
    {
        OS_TPrintf("** pDecrypted != pPlainText\n");
    }

error_exit:
    OS_Free(pDecrypted);
    OS_Free(pEncrypted);

    return bSuccess;
}


/*---------------------------------------------------------------------------*
  Name:         TwlMain

  Description:  The main function.

  Arguments:    None.

  Returns:      None.
 *---------------------------------------------------------------------------*/
void TwlMain(void)
{
    BOOL bSampleSucceeded = FALSE;

    // Initialization
    OS_Init();
    DEMO_InitInteruptSystem();
    DEMO_InitAllocSystem();
    OS_TPrintf("*** start aes demo\n");


    // Run demo
    if( OS_IsRunOnTwl() )
    {
        bSampleSucceeded = SampleMain();
    }
    else
    {
        OS_Warning("demo is not run on TWL");
    }


    // Display demo run results
    OS_TPrintf("*** End of demo\n");
    OS_TPrintf("demo %s\n", (bSampleSucceeded ? "succeeded": "failed"));
    GX_Init();
    *(GXRgb*)HW_BG_PLTT = (GXRgb)(bSampleSucceeded ? GX_RGB(0, 31, 0): GX_RGB(31, 0, 0));
    GX_DispOn();
    OS_Terminate();
}


/*---------------------------------------------------------------------------*
  Name:         DEMO_AESCallback

  Description:  This is the callback called at AES processing completion.
                It is of type AESCallback.

  Arguments:    result: AES processing result
                arg:    Last argument passed in AES_Ctr

  Returns:      None.
 *---------------------------------------------------------------------------*/
static void DEMO_AESCallback(AESResult result, void* arg)
{
    OSMessageQueue* pQ = (OSMessageQueue*)arg;
    (void)OS_SendMessage(pQ, (OSMessage)result, OS_MESSAGE_BLOCK);
}

/*---------------------------------------------------------------------------*
  Name:         DEMO_WaitAes

  Description:  Returns the result of awaiting AES processing completion.
                DEMO_AESCallback must have been specified in AES_Ctr.

  Arguments:    pQ: Message queue passed as the last AES_Ctr argument

  Returns:      AES processing result.
 *---------------------------------------------------------------------------*/
static AESResult DEMO_WaitAes(OSMessageQueue* pQ)
{
    OSMessage msg;
    (void)OS_ReceiveMessage(pQ, &msg, OS_MESSAGE_BLOCK);
    return (AESResult)msg;
}

/*---------------------------------------------------------------------------*
  Name:         DEMO_PrintBytes

  Description:  Outputs the specified binary array in hexadecimal to debug output.

  Arguments:    pvoid:  Pointer to the target binary array
                size:   Number of bytes in the target binary array

  Returns:      None.
 *---------------------------------------------------------------------------*/
static void DEMO_PrintBytes(const void* pvoid, u32 size)
{
    const u8* p = (const u8*)pvoid;
    u32 i;

    for( i = 0; i < size; ++i )
    {
        OS_TPrintf("%02X ", p[i]);
        if( i % 16 == 15 )
        {
            OS_TPrintf("\n");
        }
    }

    if( i % 16 != 0 )
    {
        OS_TPrintf("\n");
    }
}

/*---------------------------------------------------------------------------*
  Name:         DEMO_InitInteruptSystem

  Description:  Initializes interrupts.

  Arguments:    None.

  Returns:      None.
 *---------------------------------------------------------------------------*/
static void DEMO_InitInteruptSystem(void)
{
    // Enable master interrupt flag
    (void)OS_EnableIrq();
}

/*---------------------------------------------------------------------------*
  Name:         DEMO_InitAllocSystem

  Description:  Creates a heap and makes OS_Alloc usable.

  Arguments:    None.

  Returns:      None.
 *---------------------------------------------------------------------------*/
static void DEMO_InitAllocSystem(void)
{
    void* newArenaLo;
    OSHeapHandle hHeap;

    // Initialize the main arena's allocation system
    newArenaLo = OS_InitAlloc(OS_ARENA_MAIN, OS_GetMainArenaLo(), OS_GetMainArenaHi(), 1);
    OS_SetMainArenaLo(newArenaLo);

    // Create a heap in the main arena
    hHeap = OS_CreateHeap(OS_ARENA_MAIN, OS_GetMainArenaLo(), OS_GetMainArenaHi());
    (void)OS_SetCurrentHeap(OS_ARENA_MAIN, hHeap);
}