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/* wc_devcrypto.c
*
* Copyright (C) 2006-2020 wolfSSL Inc.
*
* This file is part of wolfSSL.
*
* wolfSSL is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* wolfSSL is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <wolfssl/wolfcrypt/settings.h>
#if defined(WOLFSSL_DEVCRYPTO)
#include <wolfssl/wolfcrypt/error-crypt.h>
#include <wolfssl/wolfcrypt/logging.h>
#include <wolfssl/wolfcrypt/port/devcrypto/wc_devcrypto.h>
/* sets up a context for talking to /dev/crypto
* return 0 on success */
int wc_DevCryptoCreate(WC_CRYPTODEV* ctx, int type, byte* key, word32 keySz)
{
int fd;
int isHash = 0; /* flag for if hashing algorithm */
if (ctx == NULL) {
return BAD_FUNC_ARG;
}
/* sanity check on session type before creating descriptor */
XMEMSET(ctx, 0, sizeof(WC_CRYPTODEV));
switch (type) {
case CRYPTO_SHA1:
case CRYPTO_SHA2_256:
isHash = 1;
break;
#ifndef NO_AES
case CRYPTO_AES_CTR:
case CRYPTO_AES_ECB:
case CRYPTO_AES_GCM:
case CRYPTO_AES_CBC:
isHash = 0;
break;
#endif
default:
WOLFSSL_MSG("Unknown / Unimplemented algorithm type");
return BAD_FUNC_ARG;
}
/* create descriptor */
if ((fd = open("/dev/crypto", O_RDWR, 0)) < 0) {
WOLFSSL_MSG("Error opening /dev/crypto is cryptodev module loaded?");
return WC_DEVCRYPTO_E;
}
if (fcntl(fd, F_SETFD, 1) == -1) {
WOLFSSL_MSG("Error setting F_SETFD with fcntl");
close(fd);
return WC_DEVCRYPTO_E;
}
/* set up session */
ctx->cfd = fd;
if (isHash) {
ctx->sess.mac = type;
}
else {
ctx->sess.cipher = type;
ctx->sess.key = (void*)key;
ctx->sess.keylen = keySz;
}
if (ioctl(ctx->cfd, CIOCGSESSION, &ctx->sess)) {
close(fd);
WOLFSSL_MSG("Error starting cryptodev session");
return WC_DEVCRYPTO_E;
}
(void)key;
(void)keySz;
return 0;
}
/* free up descriptor and session used with ctx */
void wc_DevCryptoFree(WC_CRYPTODEV* ctx)
{
if (ctx != NULL && ctx->cfd >= 0) {
if (ioctl(ctx->cfd, CIOCFSESSION, &ctx->sess.ses)) {
WOLFSSL_MSG("Error stopping cryptodev session");
}
close(ctx->cfd);
}
}
/* setup crypt_op structure */
void wc_SetupCrypt(struct crypt_op* crt, WC_CRYPTODEV* dev,
byte* src, int srcSz, byte* dst, byte* dig, int flag)
{
XMEMSET(crt, 0, sizeof(struct crypt_op));
crt->ses = dev->sess.ses;
crt->src = src;
crt->len = srcSz;
crt->dst = dst;
crt->mac = dig;
crt->flags = flag;
}
/* setup crypt_op structure for symmetric key operations */
void wc_SetupCryptSym(struct crypt_op* crt, WC_CRYPTODEV* dev,
byte* src, word32 srcSz, byte* dst, byte* iv, int flag)
{
XMEMSET(crt, 0, sizeof(struct crypt_op));
crt->ses = dev->sess.ses;
crt->src = src;
crt->len = srcSz;
crt->dst = dst;
crt->iv = iv;
crt->op = flag;
}
/* setup crypt_auth_op structure for aead operations */
void wc_SetupCryptAead(struct crypt_auth_op* crt, WC_CRYPTODEV* dev,
byte* src, word32 srcSz, byte* dst, byte* iv, word32 ivSz, int flag,
byte* authIn, word32 authInSz, byte* authTag, word32 authTagSz)
{
XMEMSET(crt, 0, sizeof(struct crypt_op));
crt->ses = dev->sess.ses;
crt->src = src;
crt->len = srcSz;
crt->dst = dst;
crt->iv = iv;
crt->iv_len = ivSz;
crt->op = flag;
/* also set auth in and tag */
crt->auth_src = authIn;
crt->auth_len = authInSz;
crt->tag = authTag;
crt->tag_len = authTagSz;
}
#endif /* WOLFSSL_DEVCRYPTO */
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