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// SPDX-License-Identifier: GPL-2.0+
/*
* Advanced Crypto Engine - SHA Firmware
* Copyright (c) 2012 Samsung Electronics
*/
#include <common.h>
#include "ace_sha.h"
#include <log.h>
#include <rand.h>
#ifdef CONFIG_SHA_HW_ACCEL
#include <u-boot/sha256.h>
#include <u-boot/sha1.h>
#include <linux/errno.h>
/* SHA1 value for the message of zero length */
static const unsigned char sha1_digest_emptymsg[SHA1_SUM_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_SUM_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(const unsigned char *pbuf, unsigned int buf_len,
unsigned char *pout, unsigned int hash_type)
{
unsigned int i, reg, len;
unsigned int *pdigest;
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_SUM_LEN);
else
memcpy(pout, sha256_digest_emptymsg, SHA256_SUM_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);
while ((readl(&ace_sha_reg->hash_status) & ACE_HASH_MSGDONE_MASK) ==
ACE_HASH_MSGDONE_OFF) {
/*
* PRNG error bit goes HIGH if a PRNG request occurs without
* a complete seed setup. We are using this bit to check h/w
* fault because proper setup is not expected in that case.
*/
if ((readl(&ace_sha_reg->hash_status)
& ACE_HASH_PRNGERROR_MASK) == ACE_HASH_PRNGERROR_ON)
return -EBUSY;
}
/* 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) ? SHA1_SUM_LEN : SHA256_SUM_LEN;
for (i = 0; i < len / 4; 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;
}
void hw_sha256(const unsigned char *pbuf, unsigned int buf_len,
unsigned char *pout, unsigned int chunk_size)
{
if (ace_sha_hash_digest(pbuf, buf_len, pout, ACE_SHA_TYPE_SHA256))
debug("ACE was not setup properly or it is faulty\n");
}
void hw_sha1(const unsigned char *pbuf, unsigned int buf_len,
unsigned char *pout, unsigned int chunk_size)
{
if (ace_sha_hash_digest(pbuf, buf_len, pout, ACE_SHA_TYPE_SHA1))
debug("ACE was not setup properly or it is faulty\n");
}
#endif /* CONFIG_SHA_HW_ACCEL */
#ifdef CONFIG_LIB_HW_RAND
static unsigned int seed_done;
void srand(unsigned int seed)
{
struct exynos_ace_sfr *reg =
(struct exynos_ace_sfr *)samsung_get_base_ace_sfr();
int i, status;
/* Seed data */
for (i = 0; i < ACE_HASH_PRNG_REG_NUM; i++)
writel(seed << i, ®->hash_seed[i]);
/* Wait for seed setup done */
while (1) {
status = readl(®->hash_status);
if ((status & ACE_HASH_SEEDSETTING_MASK) ||
(status & ACE_HASH_PRNGERROR_MASK))
break;
}
seed_done = 1;
}
unsigned int rand(void)
{
struct exynos_ace_sfr *reg =
(struct exynos_ace_sfr *)samsung_get_base_ace_sfr();
int i, status;
unsigned int seed = (unsigned int)&status;
unsigned int ret = 0;
if (!seed_done)
srand(seed);
/* Start PRNG */
writel(ACE_HASH_ENGSEL_PRNG | ACE_HASH_STARTBIT_ON, ®->hash_control);
/* Wait for PRNG done */
while (1) {
status = readl(®->hash_status);
if (status & ACE_HASH_PRNGDONE_MASK)
break;
if (status & ACE_HASH_PRNGERROR_MASK) {
seed_done = 0;
return 0;
}
}
/* Clear Done IRQ */
writel(ACE_HASH_PRNGDONE_MASK, ®->hash_status);
/* Read a PRNG result */
for (i = 0; i < ACE_HASH_PRNG_REG_NUM; i++)
ret += readl(®->hash_prng[i]);
seed_done = 0;
return ret;
}
unsigned int rand_r(unsigned int *seedp)
{
srand(*seedp);
return rand();
}
#endif /* CONFIG_LIB_HW_RAND */
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