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emrtd: split 3des encryption to its own func

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Ave 2020-12-10 22:53:01 +03:00
parent 69be5f8b25
commit 6086ede2ed
1 changed files with 22 additions and 11 deletions
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33
client/src/cmdhfemrtd.c
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@ -156,6 +156,18 @@ static int asn1fieldlength(uint8_t *datain, int datainlen) {
return false;
}
static void des3_encrypt(uint8_t *iv, uint8_t *key, uint8_t *input, uint8_t *output) {
mbedtls_des3_context ctx;
mbedtls_des3_set2key_enc(&ctx, key);
mbedtls_des3_crypt_cbc(&ctx // des3_context
, MBEDTLS_DES_ENCRYPT // int mode
, sizeof(input) // length
, iv // iv[8]
, input // input
, output // output
);
}
static void deskey(uint8_t *seed, uint8_t *type, int length, uint8_t *dataout) {
PrintAndLogEx(INFO, "seed: %s", sprint_hex_inrow(seed, 16));
@ -199,6 +211,13 @@ static int get_challenge(int length, uint8_t *dataout, int *dataoutlen) {
return exchange_commands(cmd, dataout, dataoutlen, false, true);
}
// static int external_authenticate(const char *response, int length, uint8_t *dataout, int *dataoutlen) {
// char cmd[50];
// sprintf(cmd, "00%s00%02i%02X%02i", EXTERNAL_AUTHENTICATE, length, sprint_hex_inrow(response, length), length);
// return exchange_commands(cmd, dataout, dataoutlen, false, true);
// }
static int _read_binary(int offset, int bytes_to_read, uint8_t *dataout, int *dataoutlen) {
char cmd[50];
sprintf(cmd, "00%s%04i%02i", READ_BINARY, offset, bytes_to_read);
@ -322,26 +341,18 @@ int infoHF_EMRTD(char *documentnumber, char *dob, char *expiry) {
memcpy(S + 8, rnd_ic, 8);
memcpy(S + 16, k_ifd, 16);
mbedtls_des3_context ctx;
mbedtls_des3_set2key_enc(&ctx, kenc);
PrintAndLogEx(INFO, "S: %s", sprint_hex_inrow(S, 32));
uint8_t iv[8] = { 0x00 };
uint8_t e_ifd[8] = { 0x00 };
mbedtls_des3_crypt_cbc(&ctx // des3_context
, MBEDTLS_DES_ENCRYPT // int mode
, sizeof(S) // length
, iv // iv[8]
, S // input
, e_ifd // output
);
des3_encrypt(iv, kenc, S, e_ifd);
PrintAndLogEx(INFO, "e_ifd: %s", sprint_hex_inrow(e_ifd, 8));
// TODO: get m_ifd by ISO 9797-1 Algo 3(e_ifd, m_mac)
// TODO: get cmd_data by e_ifd + m_ifd
// TODO: iso_7816_external_authenticate(passport.ToHex(cmd_data),Kmac)
PrintAndLogEx(INFO, "S: %s", sprint_hex_inrow(S, 32));
DropField();
return PM3_SUCCESS;
}