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/*
* Advanced Crypto Engine - SHA Firmware
*
* Copyright (c) 2012 Samsung Electronics
*
* This program 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.
*
* This program 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <common.h>
#include <asm/arch/ace_sha.h>
#include <asm/arch/ace_sfr.h>
/* Maximum input data size is 8 MB. Timeout observed for data size above 8MB */
#define TIMEOUT_MS 100
#define SHA1_DIGEST_LEN 20
#define SHA256_DIGEST_LEN 32
/* SHA1 value for the message of zero length */
static const unsigned char sha1_digest_emptymsg[SHA1_DIGEST_LEN] = {
0xDA, 0x39, 0xA3, 0xEE, 0x5E, 0x6B, 0x4B, 0x0D,
0x32, 0x55, 0xBF, 0xFF, 0x95, 0x60, 0x18, 0x90,
0xAF, 0xD8, 0x07, 0x09};
/* SHA256 value for the message of zero length */
static const unsigned char sha256_digest_emptymsg[SHA256_DIGEST_LEN] = {
0xE3, 0xB0, 0xC4, 0x42, 0x98, 0xFC, 0x1C, 0x14,
0x9A, 0xFB, 0xF4, 0xC8, 0x99, 0x6F, 0xB9, 0x24,
0x27, 0xAE, 0x41, 0xE4, 0x64, 0x9B, 0x93, 0x4C,
0xA4, 0x95, 0x99, 0x1B, 0x78, 0x52, 0xB8, 0x55};
int ace_sha_hash_digest(
unsigned char *pout, unsigned char *pbuf,
unsigned int buf_len, unsigned int hash_type)
{
unsigned int i, reg, len;
unsigned int *pdigest;
ulong start;
struct exynos_ace_sfr *ace_sha_reg =
(struct exynos_ace_sfr *) samsung_get_base_ace_sfr();
if (buf_len == 0) {
/* ACE H/W cannot compute hash value for empty string */
if (hash_type == ACE_SHA_TYPE_SHA1)
memcpy(pout, sha1_digest_emptymsg, SHA1_DIGEST_LEN);
else
memcpy(pout, sha256_digest_emptymsg, SHA256_DIGEST_LEN);
return 0;
}
/* Flush HRDMA */
writel(ACE_FC_HRDMACFLUSH_ON, &ace_sha_reg->fc_hrdmac);
writel(ACE_FC_HRDMACFLUSH_OFF, &ace_sha_reg->fc_hrdmac);
/* Set byte swap of data in */
writel(ACE_HASH_SWAPDI_ON | ACE_HASH_SWAPDO_ON | ACE_HASH_SWAPIV_ON,
&ace_sha_reg->hash_byteswap);
/* Select Hash input mux as external source */
reg = readl(&ace_sha_reg->fc_fifoctrl);
reg = (reg & ~ACE_FC_SELHASH_MASK) | ACE_FC_SELHASH_EXOUT;
writel(reg, &ace_sha_reg->fc_fifoctrl);
/* Set Hash as SHA1 or SHA256 and start Hash engine */
reg = (hash_type == ACE_SHA_TYPE_SHA1) ?
ACE_HASH_ENGSEL_SHA1HASH : ACE_HASH_ENGSEL_SHA256HASH;
reg |= ACE_HASH_STARTBIT_ON;
writel(reg, &ace_sha_reg->hash_control);
/* Enable FIFO mode */
writel(ACE_HASH_FIFO_ON, &ace_sha_reg->hash_fifo_mode);
/* Set message length */
writel(buf_len, &ace_sha_reg->hash_msgsize_low);
writel(0, &ace_sha_reg->hash_msgsize_high);
/* Set HRDMA */
writel((unsigned int)pbuf, &ace_sha_reg->fc_hrdmas);
writel(buf_len, &ace_sha_reg->fc_hrdmal);
start = get_timer(0);
while ((readl(&ace_sha_reg->hash_status) & ACE_HASH_MSGDONE_MASK) ==
ACE_HASH_MSGDONE_OFF) {
if (get_timer(start) > TIMEOUT_MS) {
debug("%s: Timeout waiting for ACE\n", __func__);
return -1;
}
}
/* Clear MSG_DONE bit */
writel(ACE_HASH_MSGDONE_ON, &ace_sha_reg->hash_status);
/* Read hash result */
pdigest = (unsigned int *)pout;
len = (hash_type == ACE_SHA_TYPE_SHA1) ? 5 : 8;
for (i = 0; i < len ; i++)
pdigest[i] = readl(&ace_sha_reg->hash_result[i]);
/* Clear HRDMA pending bit */
writel(ACE_FC_HRDMA, &ace_sha_reg->fc_intpend);
return 0;
}
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