Hello guys,
During implementation of a test set for CryptoCell AES CCM* functionality i'm facing some issue with the CryptoCell.
Encryption works fine without any issue. When it comes to the decryption parts only first test set passed whereas the second fails with error code 0x00F5000, CRYS_FATAL_ERROR.
Initialization covers following steps:
NRF_CRYPTOCELL->ENABLE = 1; SaSi_LibInit() CRYS_AESCCMStar_Init()
the test cases are the following 2 where it does not matter if you swap them.
aes_ccms_dec_suite_t aes_ccms_dec_suite[] = {
{
{ 0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, /* key */
0, /* tag len */
{ 0x00, 0x00, 0xf0, 0xe0, 0xd0, 0xc0, 0xb0, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x04 }, /* nonce */
{ 0x69, 0x98, 0x03, 0x33, 0x63, 0xbb, 0xaa, 0x01, 0x00, 0x0d, 0x00, 0x00, 0x00, 0x00, 0x03}, /* a vector */
{ 0x92, 0xe8, 0xad, 0xca, 0x53, 0x81, 0xbf, 0xd0, 0x5b, 0xdd, 0xf3, 0x61, 0x09, 0x09, 0x82, 0xe6, 0x2c,
0x61, 0x01, 0x4e, 0x7b, 0x34, 0x4f, 0x09}, /* c vector (m + tag) */
0, /* len_a */
20, /* len_m */
2, /* CCM L */
{ 0x14, 0xaa, 0xbb, 0x00, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b,
0x0c, 0x0d, 0x0e, 0x0f } /* expected plaintext */
},
{
{ 0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, /* key */
4, /* tag len */
{ 0x00, 0x00, 0xf0, 0xe0, 0xd0, 0xc0, 0xb0, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x05 }, /* nonce */
{ 0x69, 0x98, 0x03, 0x33, 0x63, 0xbb, 0xaa, 0x01, 0x00, 0x0d, 0x00, 0x00, 0x00, 0x00, 0x03 }, /* a vector */
{ 0x92, 0xe8, 0xad, 0xca, 0x53, 0x81, 0xbf, 0xd0, 0x5b, 0xdd, 0xf3, 0x61, 0x09, 0x09, 0x82, 0xe6, 0x2c,
0x61, 0x01, 0x4e, 0x7b, 0x34, 0x4f, 0x09 }, /* c vector (m + tag) */
15, /* len_a */
24, /* len_c */
2, /* CCM L */
{ 0x14, 0xaa, 0xbb, 0x00, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b,
0x0c, 0x0d, 0x0e, 0x0f } /* expected plaintext */
},
};
foreach aes_ccms_dec_suite[]
CRYS_AESCCMStar(
SASI_AES_DECRYPT,
key,
CRYS_AES_Key128BitSize,
nonce,
(15-l),
a,
len_a,
m,
*len_m,
m,
len_mac,
&m[*len_m]
);
Calling SaSi_LibFini makes no sense for me. And somesthing like CRYS_AESCCM_Finish is not existing.
I also tried to initialze the user context again before i call any crypto operation using CRYS_AESCCMStar_Init with Encrypt or Decrypt respectivly - without success. Which brought me to the point leaving that call aside which had no consequences so far.
Any considerations what might be issue, or do i miss something? Is there any other documentation of the library API than https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v14.2.0%2Fgroup__cryptocell__api.html ?
Best regards
Chris
