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added rudimentary functions for doing AES authentication against MIFARE UL AES tags. (wip)

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This commit is contained in:
iceman1001 2024-02-15 16:20:47 +01:00
commit c4c1601446
11 changed files with 330 additions and 27 deletions
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49
armsrc/desfire_crypto.c
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@ -119,7 +119,56 @@ void tdes_nxp_send(const void *in, void *out, size_t length, const void *key, un
}
}
void aes128_nxp_receive(const void *in, void *out, size_t length, const void *key, unsigned char iv[8]) {
if (length % 8) return;
mbedtls_aes_setkey_dec(&actx, key, 128);
uint8_t i;
unsigned char temp[8];
uint8_t *tin = (uint8_t *) in;
uint8_t *tout = (uint8_t *) out;
while (length > 0) {
memcpy(temp, tin, 8);
mbedtls_aes_crypt_ecb(&actx, MBEDTLS_AES_DECRYPT, tin, tout);
for (i = 0; i < 8; i++) {
tout[i] = (unsigned char)(tout[i] ^ iv[i]);
}
memcpy(iv, temp, 8);
tin += 8;
tout += 8;
length -= 8;
}
}
void aes128_nxp_send(const void *in, void *out, size_t length, const void *key, unsigned char iv[8]) {
if (length % 8) return;
mbedtls_aes_setkey_enc(&actx, key, 128);
uint8_t i;
uint8_t *tin = (uint8_t *) in;
uint8_t *tout = (uint8_t *) out;
while (length > 0) {
for (i = 0; i < 8; i++) {
tin[i] = (unsigned char)(tin[i] ^ iv[i]);
}
mbedtls_aes_crypt_ecb(&actx, MBEDTLS_AES_ENCRYPT, tin, tout);
memcpy(iv, tout, 8);
tin += 8;
tout += 8;
length -= 8;
}
}
void Desfire_des_key_new(const uint8_t value[8], desfirekey_t key) {
uint8_t data[8];