Hi All,
I have a problem with tag generating for CRYP_AES_GCM_GMAC. The main crypting is fully working, but AuthTag is generated wrongly. It is strongly depend when the generating is started. When you change for (int i = 0; i < 10000; i++) {}; you will receive different values. I have no idea, what is wrong. (CRC clocks on)
Supposed data:
uint8_t tag[16] = { 19, 74, 107, 250, 55, 74, 33, 198, 182, 189, 43, 1, 146, 146, 24, 92 };
Milan
void TestCryptoAES(void)
{
CRYP_HandleTypeDef hcryp;
uint8_t InitVector[AES_BLOCK_SIZE] = { 10, 0, 0, 0, 4, 3, 2, 1, 100, 231, 96, 38, 0, 0, 0, 2 };
uint8_t AES128key[AES_BLOCK_SIZE] = { 118, 101, 114, 121, 118, 101, 114, 121, 115, 101, 99, 114, 116, 107, 101, 121 };
// input "raw" data
uint8_t plainText[AES_BLOCK_SIZE] = { 1, 2, 0, 12, 1, 2, 3, 4, 0, 0, 0, 10, 0, 0, 0, 0, };
// input crypted data
uint8_t CryptedText[AES_BLOCK_SIZE] = { 211, 160, 203, 62, 56, 207, 53, 7, 35, 108, 33, 133, 237, 185, 133, 82, };
// uncrypted data
uint8_t header[AES_BLOCK_SIZE] = { 1, 16, 0, 44, 1, 2, 3, 4, 0, 0, 0, 10, 38, 96, 231, 100 };
uint8_t InitVectorSwapped[AES_BLOCK_SIZE]; // = { 0 ,0 , 0 , 10 , 1 , 2 , 3 , 4 , 38 , 96 ,231, 100, 2 , 0 , 0 , 0 };
uint8_t AES128keySwapped[AES_BLOCK_SIZE]; // = { 121,114, 101, 118 , 121, 114, 101, 118, 114, 99 ,101, 115, 121, 101, 107, 116 };
uint8_t outputText[AES_BLOCK_SIZE];
uint8_t outputTag[AES_BLOCK_SIZE];
memset(outputText, 0, sizeof(outputText));
memset(outputTag, 0, sizeof(outputTag));
byteswap_ulong(InitVector, InitVectorSwapped, AES_BLOCK_SIZE);
byteswap_ulong(AES128key, AES128keySwapped, AES_BLOCK_SIZE);
hcryp.Instance = AES;
hcryp.Init.DataType = CRYP_DATATYPE_8B;
hcryp.Init.KeySize = CRYP_KEYSIZE_128B;
hcryp.Init.pKey = (uint32_t*)AES128keySwapped;
hcryp.Init.pInitVect = (uint32_t*)InitVectorSwapped;
hcryp.Init.Algorithm = CRYP_AES_GCM_GMAC;
hcryp.Init.Header = (uint32_t*)header;
hcryp.Init.HeaderSize = 16;
hcryp.Init.DataWidthUnit = CRYP_DATAWIDTHUNIT_BYTE;
__HAL_RCC_AES_CLK_ENABLE();
for (int i = 0; i < 10000; i++) {};
if (HAL_CRYP_Init(&hcryp) != HAL_OK)
{
for (;;) {};
}
if (HAL_CRYP_Encrypt(&hcryp, (uint32_t*)plainText, 16, (uint32_t*)outputText, 99999) != HAL_OK)
{
for (;;) {};
}
/* Wait for processing to be done */
while (HAL_CRYP_GetState(&hcryp) != HAL_CRYP_STATE_READY);
/* Compute the authentication TAG */
if (HAL_CRYPEx_AESGCM_GenerateAuthTAG(&hcryp, (uint32_t*)outputTag, 99999) != HAL_OK)
{
/* Processing Error */
for (;;) {};
}
while (HAL_CRYP_GetState(&hcryp) != HAL_CRYP_STATE_READY);
for (;;) {};
}
