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Added procedure for verifying CVC (unfinished).

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Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
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Pol Henarejos 2022-06-08 20:01:23 +02:00
parent 0e59166c64
commit d96d7a533e
No known key found for this signature in database
GPG Key ID: C0095B7870A4CCD3
1 changed files with 70 additions and 12 deletions
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82
src/hsm/cvc.c
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@ -241,7 +241,7 @@ size_t asn1_cvc_aut(void *rsa_ecdsa, uint8_t key_type, uint8_t *buf, size_t buf_
return p-buf;
}
uint8_t *cvc_get_field(uint8_t *data, size_t len, size_t *olen, uint16_t tag) {
const uint8_t *cvc_get_field(const uint8_t *data, size_t len, size_t *olen, uint16_t tag) {
uint8_t *rdata = NULL;
if (data == NULL || len == 0)
return NULL;
@ -250,24 +250,82 @@ uint8_t *cvc_get_field(uint8_t *data, size_t len, size_t *olen, uint16_t tag) {
return rdata;
}
uint8_t *cvc_get_car(uint8_t *data, size_t len, size_t *olen) {
uint8_t *bkdata = data;
const uint8_t *cvc_get_body(const uint8_t *data, size_t len, size_t *olen) {
const uint8_t *bkdata = data;
if ((data = cvc_get_field(data, len, olen, 0x67)) == NULL) /* Check for CSR */
data = bkdata;
if ((data = cvc_get_field(data, len, olen, 0x7F21)) != NULL) {
if ((data = cvc_get_field(data, len, olen, 0x7F4E)) != NULL)
return cvc_get_field(data, len, olen, 0x42);
return cvc_get_field(data, len, olen, 0x7F4E);
}
return NULL;
}
uint8_t *cvc_get_chr(uint8_t *data, size_t len, size_t *olen) {
uint8_t *bkdata = data;
if ((data = cvc_get_field(data, len, olen, 0x67)) == NULL) /* Check for CSR */
data = bkdata;
if ((data = cvc_get_field(data, len, olen, 0x7F21)) != NULL) {
if ((data = cvc_get_field(data, len, olen, 0x7F4E)) != NULL)
return cvc_get_field(data, len, olen, 0x5F20);
const uint8_t *cvc_get_car(const uint8_t *data, size_t len, size_t *olen) {
if ((data = cvc_get_body(data, len, olen)) != NULL) {
return cvc_get_field(data, len, olen, 0x42);
}
return NULL;
}
const uint8_t *cvc_get_chr(const uint8_t *data, size_t len, size_t *olen) {
if ((data = cvc_get_body(data, len, olen)) != NULL) {
return cvc_get_field(data, len, olen, 0x5F20);
}
return NULL;
}
const uint8_t *cvc_get_pub(const uint8_t *data, size_t len, size_t *olen) {
if ((data = cvc_get_body(data, len, olen)) != NULL) {
return cvc_get_field(data, len, olen, 0x7F49);
}
return NULL;
}
extern PUK_store puk_store[3];
int cvc_verify(const uint8_t *cert, size_t cert_len, const uint8_t *ca, size_t ca_len) {
size_t puk_len = 0;
const uint8_t *puk = cvc_get_pub(ca, ca_len, &puk_len);
if (!puk)
return CCID_WRONG_DATA;
const uint8_t *t81 = NULL;
size_t car_len = 0;
const uint8_t *car = cvc_get_car(ca, ca_len, &car_len);
if (!car)
return CCID_WRONG_DATA;
do {
size_t t81_len = 0;
t81 = cvc_get_field(puk, puk_len, &t81_len, 0x81);
if (!t81 && car) {
for (int i = 0; i < sizeof(puk_store)/sizeof(PUK_store); i++) {
if (memcmp(puk_store[i].chr, car, car_len) == 0) {
puk = puk_store[i].puk;
puk_len = puk_store[i].puk_len;
if (memcmp(puk_store[i].car, puk_store[i].chr, puk_store[i].car_len) != 0) {
car = puk_store[i].car;
car_len = puk_store[i].car_len;
}
else
car = NULL;
break;
}
}
}
} while (t81 == NULL && car != NULL);
if (t81 == NULL)
return CCID_WRONG_DATA;
size_t oid_len = 0;
const uint8_t *oid = cvc_get_field(puk, puk_len, &oid_len, 0x6);
if (!oid)
return CCID_WRONG_DATA;
if (memcmp(oid, "\x4\x0\x7F\x0\x7\x2\x2\x2\x1\x2", oid_len) == 0) { //RSA
mbedtls_rsa_context rsa;
mbedtls_rsa_init(&rsa);
}
else if (memcmp(oid, "\x4\x0\x7F\x0\x7\x2\x2\x2\x2\x3", oid_len) == 0) { //ECC
mbedtls_ecdsa_context ecdsa;
mbedtls_ecdsa_init(&ecdsa);
}
return CCID_OK;
}