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/* Copyright (c) 2001, Matej Pfajfar.
* Copyright (c) 2001-2004, Roger Dingledine.
* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
* Copyright (c) 2007-2019, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* \file aes_nss.c
* \brief Use NSS to implement AES_CTR.
**/
#include "orconfig.h"
#include "lib/crypt_ops/aes.h"
#include "lib/crypt_ops/crypto_nss_mgt.h"
#include "lib/crypt_ops/crypto_util.h"
#include "lib/log/util_bug.h"
DISABLE_GCC_WARNING(strict-prototypes)
#include <pk11pub.h>
#include <secerr.h>
ENABLE_GCC_WARNING(strict-prototypes)
aes_cnt_cipher_t *
aes_new_cipher(const uint8_t *key, const uint8_t *iv,
int key_bits)
{
const CK_MECHANISM_TYPE ckm = CKM_AES_CTR;
SECItem keyItem = { .type = siBuffer,
.data = (unsigned char *)key,
.len = (key_bits / 8) };
CK_AES_CTR_PARAMS params;
params.ulCounterBits = 128;
memcpy(params.cb, iv, 16);
SECItem ivItem = { .type = siBuffer,
.data = (unsigned char *)¶ms,
.len = sizeof(params) };
PK11SlotInfo *slot = NULL;
PK11SymKey *keyObj = NULL;
SECItem *ivObj = NULL;
PK11Context *result = NULL;
slot = PK11_GetBestSlot(ckm, NULL);
if (!slot)
goto err;
keyObj = PK11_ImportSymKey(slot, ckm, PK11_OriginUnwrap,
CKA_ENCRYPT, &keyItem, NULL);
if (!keyObj)
goto err;
ivObj = PK11_ParamFromIV(ckm, &ivItem);
if (!ivObj)
goto err;
PORT_SetError(SEC_ERROR_IO);
result = PK11_CreateContextBySymKey(ckm, CKA_ENCRYPT, keyObj, ivObj);
err:
memwipe(¶ms, 0, sizeof(params));
if (ivObj)
SECITEM_FreeItem(ivObj, PR_TRUE);
if (keyObj)
PK11_FreeSymKey(keyObj);
if (slot)
PK11_FreeSlot(slot);
tor_assert(result);
return (aes_cnt_cipher_t *)result;
}
void
aes_cipher_free_(aes_cnt_cipher_t *cipher)
{
if (!cipher)
return;
PK11_DestroyContext((PK11Context*) cipher, PR_TRUE);
}
void
aes_crypt_inplace(aes_cnt_cipher_t *cipher, char *data_, size_t len_)
{
tor_assert(len_ <= INT_MAX);
SECStatus s;
PK11Context *ctx = (PK11Context*)cipher;
unsigned char *data = (unsigned char *)data_;
int len = (int) len_;
int result_len = 0;
s = PK11_CipherOp(ctx, data, &result_len, len, data, len);
tor_assert(s == SECSuccess);
tor_assert(result_len == len);
}
int
evaluate_evp_for_aes(int force_value)
{
(void)force_value;
return 0;
}
int
evaluate_ctr_for_aes(void)
{
return 0;
}
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