//*****************************************************************************
//
// Run the AES encryption/decryption example.
//
//*****************************************************************************
int
main(void)
{
unsigned char pucBlockBuf[16];
const unsigned *puKey;
unsigned char pucTempIV[16];
//
// Set the clocking to run directly from the crystal.
//
ROM_SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN |
SYSCTL_XTAL_16MHZ);
//
// Initialize the UART interface.
//
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
GPIOPinConfigure(GPIO_PA0_U0RX);
GPIOPinConfigure(GPIO_PA1_U0TX);
ROM_GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);
UARTStdioInit(0);
UARTprintf("\033[2JAES encryption/decryption using a pre-expanded key\n");
//
// Print the plain text title
//
UARTprintf("Plain Text:");
PrintBuffer((unsigned char *)g_pcPlainText, sizeof(g_pcPlainText));
//
// Get the expanded key to use for encryption
//
puKey = AESExpandedEncryptKeyData();
//
// Generate the initialization vector needed for CBC mode. A temporary
// copy is made that will be used with the crypt function because the crypt
// function will modify the IV that is passed.
//
AESGenerateIV(g_pucIV, 1);
memcpy(pucTempIV, g_pucIV, 16);
//
// Encrypt the plaintext message using CBC mode
//
aes_crypt_cbc(puKey, AES_ENCRYPT, 16, pucTempIV,
(unsigned char *)g_pcPlainText, pucBlockBuf);
//
// Print the encrypted block to the display. Note that it will appear as
// nonsense data.
//
UARTprintf("Encrypted:");
PrintBuffer(pucBlockBuf, sizeof(pucBlockBuf));
//
// Get the expanded key to use for decryption
//
puKey = AESExpandedDecryptKeyData();
//
// Decrypt the message using CBC mode
//
memcpy(pucTempIV, g_pucIV, 16);
aes_crypt_cbc(puKey, AES_DECRYPT, 16, pucTempIV, pucBlockBuf, pucBlockBuf);
//
// Print the decrypted block to the display. It should be the same text
// as the original message.
//
UARTprintf("Decrypted:");
PrintBuffer(pucBlockBuf, sizeof(pucBlockBuf));
//
// Finished.
//
while(1)
{
}
}
//*****************************************************************************
//
// Run the AES encryption/decryption example
//
//*****************************************************************************
int
main(void)
{
unsigned char ucBlockBuf[17];
const unsigned *puKey;
unsigned char ucTempIV[16];
//
// Set the clocking to run directly from the crystal.
//
SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN |
SYSCTL_XTAL_8MHZ);
//
// Initialize the OLED display.
//
RIT128x96x4Init(1000000);
//
// Print a title and the plain text to the display
//
RIT128x96x4StringDraw("AES Expand Example", 12, 8, 15);
RIT128x96x4StringDraw("------------------", 12, 16, 15);
RIT128x96x4StringDraw("Plain Text:", 30, 24, 15);
RIT128x96x4StringDraw(g_cPlainText, 20, 32, 15);
//
// Get the expanded key to use for encryption
//
puKey = AESExpandedEncryptKeyData();
//
// Generate the initialization vector needed for CBC mode.
// A temporary copy is made that will be used with the crypt
// function because the crypt function will modify the IV that is passed.
//
AESGenerateIV(g_ucIV, 1);
memcpy(ucTempIV, g_ucIV, 16);
//
// Encrypt the plaintext message using CBC mode
//
aes_crypt_cbc(puKey, AES_ENCRYPT, 16, ucTempIV,
(unsigned char *)g_cPlainText, ucBlockBuf);
//
// Print the encrypted block to the display. Note that it will
// appear as nonsense data. The block needs to be null terminated
// so that the StringDraw function will work correctly.
//
ucBlockBuf[16] = 0;
RIT128x96x4StringDraw("Encrypted:", 34, 48, 15);
RIT128x96x4StringDraw((char *)ucBlockBuf, 20, 56, 15);
//
// Get the expanded key to use for decryption
//
puKey = AESExpandedDecryptKeyData();
//
// Decrypt the message using CBC mode
//
memcpy(ucTempIV, g_ucIV, 16);
aes_crypt_cbc(puKey, AES_DECRYPT, 16, ucTempIV, ucBlockBuf, ucBlockBuf);
//
// Print the decrypted block to the display. It should be the same text
// as the original message.
//
RIT128x96x4StringDraw("Decrypted:", 34, 72, 15);
RIT128x96x4StringDraw((char *)ucBlockBuf, 20, 80, 15);
//
// Finished.
//
while(1)
{
}
}
//*****************************************************************************
//
// Run the AES encryption/decryption example
//
//*****************************************************************************
int
main(void)
{
unsigned char ucBlockBuf[17];
const unsigned *puKey;
unsigned char ucTempIV[16];
tContext sContext;
tRectangle sRect;
long lCenterX;
//
// Set the clocking to run directly from the crystal.
//
ROM_SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN |
SYSCTL_XTAL_16MHZ);
//
// Set the pinout appropriately for this board.
//
PinoutSet();
//
// Initialize the display driver.
//
Kitronix320x240x16_SSD2119Init();
//
// Initialize the graphics context and find the middle X coordinate.
//
GrContextInit(&sContext, &g_sKitronix320x240x16_SSD2119);
lCenterX = GrContextDpyWidthGet(&sContext) / 2;
//
// Fill the top 15 rows of the screen with blue to create the banner.
//
sRect.sXMin = 0;
sRect.sYMin = 0;
sRect.sXMax = GrContextDpyWidthGet(&sContext) - 1;
sRect.sYMax = 23;
GrContextForegroundSet(&sContext, ClrDarkBlue);
GrRectFill(&sContext, &sRect);
//
// Put a white box around the banner.
//
GrContextForegroundSet(&sContext, ClrWhite);
GrRectDraw(&sContext, &sRect);
//
// Put the application name in the middle of the banner.
//
GrContextFontSet(&sContext, g_pFontCm20);
GrStringDrawCentered(&sContext, "aes-expanded-key", -1, lCenterX, 8, 0);
//
// Print the plain text title
//
GrContextFontSet(&sContext, g_pFontCmss22b);
GrStringDrawCentered(&sContext, "Plain Text:", -1, lCenterX, 60, 0);
GrStringDrawCentered(&sContext, g_cPlainText, -1, lCenterX, 85, 0);
//
// Get the expanded key to use for encryption
//
puKey = AESExpandedEncryptKeyData();
//
// Generate the initialization vector needed for CBC mode.
// A temporary copy is made that will be used with the crypt
// function because the crypt function will modify the IV that is passed.
//
AESGenerateIV(g_ucIV, 1);
memcpy(ucTempIV, g_ucIV, 16);
//
// Encrypt the plaintext message using CBC mode
//
aes_crypt_cbc(puKey, AES_ENCRYPT, 16, ucTempIV,
(unsigned char *)g_cPlainText, ucBlockBuf);
//
// Print the encrypted block to the display. Note that it will
// appear as nonsense data. The block needs to be null terminated
// so that the StringDraw function will work correctly.
//
ucBlockBuf[16] = 0;
GrStringDrawCentered(&sContext, "Encrypted:", -1, lCenterX, 120, 0);
GrStringDrawCentered(&sContext, (char *)ucBlockBuf, -1, lCenterX, 145, 0);
//
// Get the expanded key to use for decryption
//
puKey = AESExpandedDecryptKeyData();
//
// Decrypt the message using CBC mode
//
memcpy(ucTempIV, g_ucIV, 16);
aes_crypt_cbc(puKey, AES_DECRYPT, 16, ucTempIV, ucBlockBuf, ucBlockBuf);
//
// Print the decrypted block to the display. It should be the same text
// as the original message.
//
GrStringDrawCentered(&sContext, "Decrypted:", -1, lCenterX, 180, 0);
GrStringDrawCentered(&sContext, (char *)ucBlockBuf, -1, lCenterX, 205, 0);
//
// Finished.
//
while(1)
{
}
}
