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/* xil-aesgcm.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(NO_AES) && defined(WOLFSSL_XILINX_CRYPT)
#include <wolfssl/wolfcrypt/aes.h>
#ifdef HAVE_AESGCM
/* Make calls to Xilinx hardened AES-GCM crypto */
#include <wolfssl/wolfcrypt/error-crypt.h>
#include <wolfssl/wolfcrypt/logging.h>
#ifdef NO_INLINE
#include <wolfssl/wolfcrypt/misc.h>
#else
#define WOLFSSL_MISC_INCLUDED
#include <wolfcrypt/src/misc.c>
#endif
#include "xparameters.h"
enum {
AEAD_NONCE_SZ = 12,
AES_GCM_AUTH_SZ = 16, /* AES-GCM Auth Tag length */
};
int wc_AesGcmSetKey_ex(Aes* aes, const byte* key, word32 len, word32 kup)
{
XCsuDma_Config* con;
if (aes == NULL || key == NULL) {
return BAD_FUNC_ARG;
}
if (len != 32) {
WOLFSSL_MSG("Expecting a 256 bit key");
return BAD_FUNC_ARG;
}
if ((con = XCsuDma_LookupConfig(0)) == NULL) {
WOLFSSL_MSG("Failed to look up config");
return MEMORY_E;
}
/* XST_SUCCESS comes from Xilinx header file */
if (XCsuDma_CfgInitialize(&(aes->dma), con, con->BaseAddress) !=
XST_SUCCESS) {
WOLFSSL_MSG("Failed to initialize hardware");
return MEMORY_E;
}
aes->keylen = len;
aes->kup = kup;
XMEMCPY((byte*)(aes->key_init), key, len);
return 0;
}
int wc_AesGcmEncrypt(Aes* aes, byte* out,
const byte* in, word32 sz,
const byte* iv, word32 ivSz,
byte* authTag, word32 authTagSz,
const byte* authIn, word32 authInSz)
{
byte* tmp;
byte scratch[AES_BLOCK_SIZE];
byte initalCounter[AES_BLOCK_SIZE];
if ((in == NULL && sz > 0) || iv == NULL || authTag == NULL ||
authTagSz > AES_GCM_AUTH_SZ) {
return BAD_FUNC_ARG;
}
if (ivSz != AEAD_NONCE_SZ) {
WOLFSSL_MSG("Expecting an IV size of 12");
return BAD_FUNC_ARG;
}
/* API expects that output is size of input + 16 byte tag. A temporary
* buffer is created to keep AES encrypt from writing over the end of
* out buffer. */
if (in != NULL) {
if (aes->keylen != 32) {
WOLFSSL_MSG("Expecting 256 bit AES key");
return BAD_FUNC_ARG;
}
tmp = (byte*)XMALLOC(sz + AES_GCM_AUTH_SZ, aes->heap,
DYNAMIC_TYPE_TMP_BUFFER);
if (tmp == NULL) {
return MEMORY_E;
}
XSecure_AesInitialize(&(aes->xilAes), &(aes->dma), aes->kup, (word32*)iv,
aes->key_init);
XSecure_AesEncryptData(&(aes->xilAes), tmp, in, sz);
XMEMCPY(out, tmp, sz);
XMEMCPY(authTag, tmp + sz, authTagSz);
XFREE(tmp, aes->heap, DYNAMIC_TYPE_TMP_BUFFER);
}
/* handle completing tag with any additional data */
if (authIn != NULL) {
/* @TODO avoid hashing out again since Xilinx call already does */
XMEMSET(initalCounter, 0, AES_BLOCK_SIZE);
XMEMCPY(initalCounter, iv, ivSz);
initalCounter[AES_BLOCK_SIZE - 1] = 1;
GHASH(aes, authIn, authInSz, out, sz, authTag, authTagSz);
wc_AesEncryptDirect(aes, scratch, initalCounter);
xorbuf(authTag, scratch, authTagSz);
}
return 0;
}
int wc_AesGcmDecrypt(Aes* aes, byte* out,
const byte* in, word32 sz,
const byte* iv, word32 ivSz,
const byte* authTag, word32 authTagSz,
const byte* authIn, word32 authInSz)
{
byte* tag;
byte buf[AES_GCM_AUTH_SZ];
byte scratch[AES_BLOCK_SIZE];
byte initalCounter[AES_BLOCK_SIZE];
if (in == NULL || iv == NULL || authTag == NULL ||
authTagSz < AES_GCM_AUTH_SZ) {
return BAD_FUNC_ARG;
}
if (ivSz != AEAD_NONCE_SZ) {
WOLFSSL_MSG("Expecting an IV size of 12");
return BAD_FUNC_ARG;
}
/* account for additional data */
if (authIn != NULL && authInSz > 0) {
XMEMSET(initalCounter, 0, AES_BLOCK_SIZE);
XMEMCPY(initalCounter, iv, ivSz);
initalCounter[AES_BLOCK_SIZE - 1] = 1;
tag = buf;
GHASH(aes, NULL, 0, in, sz, tag, AES_GCM_AUTH_SZ);
wc_AesEncryptDirect(aes, scratch, initalCounter);
xorbuf(tag, scratch, AES_GCM_AUTH_SZ);
}
else {
tag = authTag;
}
/* calls to hardened crypto */
XSecure_AesInitialize(&(aes->xilAes), &(aes->dma), aes->kup,
(word32*)iv, aes->key_init);
XSecure_AesDecryptData(&(aes->xilAes), out, in, sz, tag);
/* account for additional data */
if (authIn != NULL && authInSz > 0) {
GHASH(aes, authIn, authInSz, in, sz, tag, AES_GCM_AUTH_SZ);
wc_AesEncryptDirect(aes, scratch, initalCounter);
xorbuf(tag, scratch, AES_GCM_AUTH_SZ);
if (ConstantCompare(authTag, tag, authTagSz) != 0) {
return AES_GCM_AUTH_E;
}
}
return 0;
}
#endif /* HAVE_AESGCM */
#endif
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