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Added support for AES CCM.

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Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
This commit is contained in:
Pol Henarejos
2023-03-23 19:20:33 +01:00
parent f5e875a6b7
commit 371ae93fcd
3 changed files with 91 additions and 1 deletions
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46
src/hsm/cmd_cipher_sym.c
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@@ -33,6 +33,7 @@
#include "mbedtls/asn1.h"
#include "mbedtls/cipher.h"
#include "mbedtls/oid.h"
#include "mbedtls/ccm.h"
/* This is copied from pkcs5.c Mbedtls */
/** Unfortunately it is declared as static, so I cannot call it. **/
@@ -577,6 +578,51 @@ int cmd_cipher_sym() {
}
res_APDU_size = enc_len;
}
else if (aes_algo == 0x07 || aes_algo == 0x1B || aes_algo == 0x2F) { /* CCM */
mbedtls_aes_free(&ctx); // No AES ctx used
mbedtls_ccm_context gctx;
mbedtls_ccm_init(&gctx);
r = mbedtls_ccm_setkey(&gctx, MBEDTLS_CIPHER_ID_AES, kdata, key_size * 8);
if (r != 0) {
return SW_EXEC_ERROR();
}
if (iv_len == 16) {
iv_len = 12;
}
mbedtls_platform_zeroize(kdata, sizeof(kdata));
if (algo == ALGO_EXT_CIPHER_ENCRYPT) {
r = mbedtls_ccm_encrypt_and_tag(&gctx,
enc_len,
iv,
iv_len,
aad,
aad_len,
enc,
res_APDU,
res_APDU + enc_len,
16);
res_APDU_size = enc_len + 16;
}
else if (algo == ALGO_EXT_CIPHER_DECRYPT) {
r = mbedtls_ccm_auth_decrypt(&gctx,
enc_len - 16,
iv,
iv_len,
aad,
aad_len,
enc,
res_APDU,
enc + enc_len - 16,
16);
res_APDU_size = enc_len - 16;
}
mbedtls_ccm_free(&gctx);
printf("r %d\n", r);
if (r != 0)
{
return SW_EXEC_ERROR();
}
}
}
else if (memcmp(oid, OID_IEEE_ALG, 8) == 0) {
if (oid_len != 9) {