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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 "debug_printf.h"
#include "registers.h"
#include "setup.h"
static void _sha_write(const void *data, size_t n)
{
const uint8_t *bp = (const uint8_t *)data;
const uint32_t *wp;
while (n && ((uint32_t)bp & 3)) { /* Feed unaligned start bytes. */
*((uint8_t *)GREG32_ADDR(KEYMGR, SHA_INPUT_FIFO)) = *bp++;
n -= 1;
}
wp = (uint32_t *)bp;
while (n >= 32) { /* Feed groups of aligned words. */
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 -= 32;
}
while (n >= 4) { /* Feed individual aligned words. */
GREG32(KEYMGR, SHA_INPUT_FIFO) = *wp++;
n -= 4;
}
bp = (uint8_t *)wp;
while (n) { /* Feed remaing bytes. */
*((uint8_t *)GREG32_ADDR(KEYMGR, SHA_INPUT_FIFO)) = *bp++;
n -= 1;
}
}
static void _sha_wait(uint32_t *digest)
{
int i;
/*
* Wait for result. TODO: what harm does glitching do? Read out
* non-digest? Old digest?
*/
while (!GREG32(KEYMGR, SHA_ITOP))
;
/* Read out final digest. */
for (i = 0; i < 8; ++i)
*digest++ = GREG32_ADDR(KEYMGR, SHA_STS_H0)[i];
GREG32(KEYMGR, SHA_ITOP) = 0; /* Clear status. */
}
void hwSHA256(const void *data, size_t n, uint32_t *digest)
{
GREG32(KEYMGR, SHA_ITOP) = 0; /* Clear status. */
GREG32(KEYMGR, SHA_CFG_MSGLEN_LO) = n;
GREG32(KEYMGR, SHA_CFG_MSGLEN_HI) = 0;
GWRITE_FIELD(KEYMGR, SHA_CFG_EN, INT_EN_DONE, 1);
GWRITE_FIELD(KEYMGR, SHA_TRIG, TRIG_GO, 1);
_sha_write(data, n);
_sha_wait(digest);
}
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