dearsky/pico-hsm
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Len of CMAC is always 16.

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Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
This commit is contained in:
Pol Henarejos
2022-03-28 17:37:24 +02:00
parent d061958f90
commit 6fe7d7991b
1 changed files with 5 additions and 55 deletions
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60
src/hsm/sc_hsm.c
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@@ -30,6 +30,7 @@
#include "mbedtls/hkdf.h" #include "mbedtls/hkdf.h"
#include "version.h" #include "version.h"
#include "cvcerts.h" #include "cvcerts.h"
#include "hash_utils.h"
const uint8_t sc_hsm_aid[] = { const uint8_t sc_hsm_aid[] = {
11, 11,
@@ -73,6 +74,7 @@ int sc_hsm_unload() {
return HSM_OK; return HSM_OK;
} }
//AES CBC encryption with a 256 bit key
static int encrypt(const uint8_t *key, const uint8_t *iv, uint8_t *data, int len) static int encrypt(const uint8_t *key, const uint8_t *iv, uint8_t *data, int len)
{ {
mbedtls_aes_context aes; mbedtls_aes_context aes;
@@ -86,6 +88,7 @@ static int encrypt(const uint8_t *key, const uint8_t *iv, uint8_t *data, int len
return mbedtls_aes_crypt_cfb128(&aes, MBEDTLS_AES_ENCRYPT, len, &iv_offset, tmp_iv, data, data); return mbedtls_aes_crypt_cfb128(&aes, MBEDTLS_AES_ENCRYPT, len, &iv_offset, tmp_iv, data, data);
} }
//AES CBC decryption with a 256 bit key
static int decrypt(const uint8_t *key, const uint8_t *iv, uint8_t *data, int len) static int decrypt(const uint8_t *key, const uint8_t *iv, uint8_t *data, int len)
{ {
mbedtls_aes_context aes; mbedtls_aes_context aes;
@@ -268,7 +271,7 @@ int cvc_prepare_signatures(sc_pkcs15_card_t *p15card, sc_cvc_t *cvc, size_t sig_
free(cvcbin); free(cvcbin);
return r; return r;
} }
hash(cvcbin, cvclen, hsh); hash256(cvcbin, cvclen, hsh);
free(cvcbin); free(cvcbin);
return HSM_OK; return HSM_OK;
} }
@@ -606,59 +609,6 @@ static int cmd_initialize() {
return SW_OK(); return SW_OK();
} }
void double_hash_pin(const uint8_t *pin, size_t len, uint8_t output[32]) {
uint8_t o1[32];
hash_multi(pin, len, o1);
for (int i = 0; i < sizeof(o1); i++)
o1[i] ^= pin[i%len];
hash_multi(o1, sizeof(o1), output);
}
void hash_multi(const uint8_t *input, size_t len, uint8_t output[32])
{
mbedtls_sha256_context ctx;
mbedtls_sha256_init(&ctx);
int iters = 256;
pico_get_unique_board_id(&unique_id);
mbedtls_sha256_starts (&ctx, 0);
mbedtls_sha256_update (&ctx, unique_id.id, sizeof(unique_id.id));
while (iters > len)
{
mbedtls_sha256_update (&ctx, input, len);
iters -= len;
}
if (iters > 0) // remaining iterations
mbedtls_sha256_update (&ctx, input, iters);
mbedtls_sha256_finish (&ctx, output);
mbedtls_sha256_free (&ctx);
}
void hash(const uint8_t *input, size_t len, uint8_t output[32])
{
mbedtls_sha256_context ctx;
mbedtls_sha256_init(&ctx);
mbedtls_sha256_starts (&ctx, 0);
mbedtls_sha256_update (&ctx, input, len);
mbedtls_sha256_finish (&ctx, output);
mbedtls_sha256_free (&ctx);
}
void generic_hash(mbedtls_md_type_t md, const uint8_t *input, size_t len, uint8_t *output) {
mbedtls_md_context_t ctx;
mbedtls_md_init(&ctx);
const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type(md);
mbedtls_md_setup(&ctx, md_info, 0);
mbedtls_md_starts(&ctx);
mbedtls_md_update(&ctx, input, len);
mbedtls_md_finish(&ctx, output);
mbedtls_md_free(&ctx);
}
static int cmd_import_dkek() { static int cmd_import_dkek() {
//if (dkeks == 0) //if (dkeks == 0)
// return SW_COMMAND_NOT_ALLOWED(); // return SW_COMMAND_NOT_ALLOWED();
@@ -1610,7 +1560,7 @@ static int cmd_cipher_sym() {
int r = mbedtls_cipher_cmac(cipher_info, kdata, key_size*8, apdu.cmd_apdu_data, apdu.cmd_apdu_data_len, res_APDU); int r = mbedtls_cipher_cmac(cipher_info, kdata, key_size*8, apdu.cmd_apdu_data, apdu.cmd_apdu_data_len, res_APDU);
if (r != 0) if (r != 0)
return SW_EXEC_ERROR(); return SW_EXEC_ERROR();
res_APDU_size = apdu.cmd_apdu_data_len; res_APDU_size = 16;
} }
else if (algo == ALGO_AES_DERIVE) { else if (algo == ALGO_AES_DERIVE) {
int r = mbedtls_hkdf(mbedtls_md_info_from_type(MBEDTLS_MD_SHA256), NULL, 0, file_read(ef->data+2), key_size, apdu.cmd_apdu_data, apdu.cmd_apdu_data_len, res_APDU, apdu.cmd_apdu_data_len); int r = mbedtls_hkdf(mbedtls_md_info_from_type(MBEDTLS_MD_SHA256), NULL, 0, file_read(ef->data+2), key_size, apdu.cmd_apdu_data, apdu.cmd_apdu_data_len, res_APDU, apdu.cmd_apdu_data_len);