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Fix response APDU in secure channel.

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Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
This commit is contained in:
Pol Henarejos
2022-04-11 01:38:15 +02:00
parent f26668b81d
commit c4c2bf86ba
1 changed files with 4 additions and 1 deletions
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5
src/hsm/eac.c
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@@ -131,11 +131,11 @@ int sm_wrap() {
int r = mbedtls_mpi_write_binary(&ssc, input, sm_blocksize);
input_len += sm_blocksize;
mbedtls_mpi_free(&ssc);
DEBUG_PAYLOAD(res_APDU, res_APDU_size);
if (res_APDU_size > 0) {
res_APDU[res_APDU_size++] = 0x80;
memset(res_APDU+res_APDU_size, 0, (sm_blocksize - (res_APDU_size%sm_blocksize)));
res_APDU_size += (sm_blocksize - (res_APDU_size%sm_blocksize));
DEBUG_PAYLOAD(res_APDU, res_APDU_size);
sm_update_iv();
aes_encrypt(sm_kenc, sm_iv, 128, HSM_AES_MODE_CBC, res_APDU, res_APDU_size);
memmove(res_APDU+1, res_APDU, res_APDU_size);
@@ -144,17 +144,20 @@ int sm_wrap() {
if (res_APDU_size < 128) {
memmove(res_APDU+2, res_APDU, res_APDU_size);
res_APDU[1] = res_APDU_size;
res_APDU_size += 2;
}
else if (res_APDU_size < 256) {
memmove(res_APDU+3, res_APDU, res_APDU_size);
res_APDU[1] = 0x81;
res_APDU[2] = res_APDU_size;
res_APDU_size += 3;
}
else {
memmove(res_APDU+4, res_APDU, res_APDU_size);
res_APDU[1] = 0x82;
res_APDU[2] = res_APDU_size >> 8;
res_APDU[3] = res_APDU_size & 0xff;
res_APDU_size += 4;
}
res_APDU[0] = 0x87;
}