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/* Copyright 2015 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "dcrypto.h"
#include "internal.h"
#include "registers.h"
#include "util.h"
#include "cryptoc/sha256.h"
static void dcrypto_sha256_init(LITE_SHA256_CTX *ctx);
static const uint8_t *dcrypto_sha256_final(LITE_SHA256_CTX *ctx);
#ifdef SECTION_IS_RO
/* RO is single threaded. */
#define mutex_lock(x)
#define mutex_unlock(x)
static inline int dcrypto_grab_sha_hw(void)
{
return 1;
}
static inline void dcrypto_release_sha_hw(void)
{
}
#else
#include "task.h"
static struct mutex hw_busy_mutex;
static int hw_busy;
int dcrypto_grab_sha_hw(void)
{
int rv = 0;
mutex_lock(&hw_busy_mutex);
if (!hw_busy) {
rv = 1;
hw_busy = 1;
}
mutex_unlock(&hw_busy_mutex);
return rv;
}
void dcrypto_release_sha_hw(void)
{
mutex_lock(&hw_busy_mutex);
hw_busy = 0;
mutex_unlock(&hw_busy_mutex);
}
#endif /* ! SECTION_IS_RO */
void dcrypto_sha_wait(enum sha_mode mode, uint32_t *digest)
{
int i;
const int digest_len = (mode == SHA1_MODE) ?
SHA_DIGEST_SIZE :
SHA256_DIGEST_SIZE;
/* Stop LIVESTREAM mode. */
GREG32(KEYMGR, SHA_TRIG) = GC_KEYMGR_SHA_TRIG_TRIG_STOP_MASK;
/* Wait for SHA DONE interrupt. */
while (!GREG32(KEYMGR, SHA_ITOP))
;
/* Read out final digest. */
for (i = 0; i < digest_len / 4; ++i)
*digest++ = GR_KEYMGR_SHA_HASH(i);
dcrypto_release_sha_hw();
}
/* Hardware SHA implementation. */
static const HASH_VTAB HW_SHA256_VTAB = {
dcrypto_sha256_init,
dcrypto_sha_update,
dcrypto_sha256_final,
DCRYPTO_SHA256_hash,
SHA256_DIGEST_SIZE
};
void dcrypto_sha_hash(enum sha_mode mode, const uint8_t *data, uint32_t n,
uint8_t *digest)
{
dcrypto_sha_init(mode);
dcrypto_sha_update(NULL, data, n);
dcrypto_sha_wait(mode, (uint32_t *) digest);
}
void dcrypto_sha_update(struct HASH_CTX *unused,
const void *data, uint32_t n)
{
const uint8_t *bp = (const uint8_t *) data;
const uint32_t *wp;
/* Feed unaligned start bytes. */
while (n != 0 && ((uint32_t)bp & 3)) {
GREG8(KEYMGR, SHA_INPUT_FIFO) = *bp++;
n -= 1;
}
/* Feed groups of aligned words. */
wp = (uint32_t *)bp;
while (n >= 8*4) {
GREG32(KEYMGR, SHA_INPUT_FIFO) = *wp++;
GREG32(KEYMGR, SHA_INPUT_FIFO) = *wp++;
GREG32(KEYMGR, SHA_INPUT_FIFO) = *wp++;
GREG32(KEYMGR, SHA_INPUT_FIFO) = *wp++;
GREG32(KEYMGR, SHA_INPUT_FIFO) = *wp++;
GREG32(KEYMGR, SHA_INPUT_FIFO) = *wp++;
GREG32(KEYMGR, SHA_INPUT_FIFO) = *wp++;
GREG32(KEYMGR, SHA_INPUT_FIFO) = *wp++;
n -= 8*4;
}
/* Feed individual aligned words. */
while (n >= 4) {
GREG32(KEYMGR, SHA_INPUT_FIFO) = *wp++;
n -= 4;
}
/* Feed remaing bytes. */
bp = (uint8_t *) wp;
while (n != 0) {
GREG8(KEYMGR, SHA_INPUT_FIFO) = *bp++;
n -= 1;
}
}
void dcrypto_sha_init(enum sha_mode mode)
{
int val;
/* Stop LIVESTREAM mode, in case final() was not called. */
GREG32(KEYMGR, SHA_TRIG) = GC_KEYMGR_SHA_TRIG_TRIG_STOP_MASK;
/* Clear interrupt status. */
GREG32(KEYMGR, SHA_ITOP) = 0;
/* Enable streaming mode. */
val = GC_KEYMGR_SHA_CFG_EN_LIVESTREAM_MASK;
/* Enable SHA DONE interrupt. */
val |= GC_KEYMGR_SHA_CFG_EN_INT_EN_DONE_MASK;
/* Select SHA mode. */
if (mode == SHA1_MODE)
val |= GC_KEYMGR_SHA_CFG_EN_SHA1_MASK;
GREG32(KEYMGR, SHA_CFG_EN) = val;
/* Turn off random nops (which are enabled by default). */
GWRITE_FIELD(KEYMGR, SHA_RAND_STALL_CTL, STALL_EN, 0);
/* Configure random nop percentage at 12%. */
GWRITE_FIELD(KEYMGR, SHA_RAND_STALL_CTL, FREQ, 2);
/* Now turn on random nops. */
GWRITE_FIELD(KEYMGR, SHA_RAND_STALL_CTL, STALL_EN, 1);
/* Start SHA engine. */
GREG32(KEYMGR, SHA_TRIG) = GC_KEYMGR_SHA_TRIG_TRIG_GO_MASK;
}
static void dcrypto_sha256_init(LITE_SHA256_CTX *ctx)
{
ctx->f = &HW_SHA256_VTAB;
dcrypto_sha_init(SHA256_MODE);
}
/* Requires dcrypto_grab_sha_hw() to be called first. */
void DCRYPTO_SHA256_init(LITE_SHA256_CTX *ctx, uint32_t sw_required)
{
if (!sw_required && dcrypto_grab_sha_hw())
dcrypto_sha256_init(ctx);
#ifndef SECTION_IS_RO
else
SHA256_init(ctx);
#endif
}
static const uint8_t *dcrypto_sha256_final(LITE_SHA256_CTX *ctx)
{
dcrypto_sha_wait(SHA256_MODE, (uint32_t *) ctx->buf);
return ctx->buf;
}
const uint8_t *DCRYPTO_SHA256_hash(const void *data, uint32_t n,
uint8_t *digest)
{
if (dcrypto_grab_sha_hw())
/* dcrypto_sha_wait() will release the hw. */
dcrypto_sha_hash(SHA256_MODE, data, n, digest);
#ifndef SECTION_IS_RO
else
SHA256_hash(data, n, digest);
#endif
return digest;
}
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