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|
/*
* arch/ubicom32/crypto/sha1_ubicom32.c
* Ubicom32 implementation of the SHA1 Secure Hash Algorithm.
*
* (C) Copyright 2009, Ubicom, Inc.
*
* This file is part of the Ubicom32 Linux Kernel Port.
*
* The Ubicom32 Linux Kernel Port 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.
*
* The Ubicom32 Linux Kernel Port 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 the Ubicom32 Linux Kernel Port. If not,
* see <http://www.gnu.org/licenses/>.
*
* Ubicom32 implementation derived from (with many thanks):
* arch/m68knommu
* arch/blackfin
* arch/parisc
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/crypto.h>
#include <crypto/sha.h>
#include <asm/linkage.h>
#include "crypto_ubicom32.h"
#define HASH_SECURITY_BLOCK_CONTROL_INIT_NO_ENCYPTION 2
#define HASH_SECURITY_BLOCK_CONTROL_INIT_SHA1 ((1 << 5) | HASH_SECURITY_BLOCK_CONTROL_INIT_NO_ENCYPTION)
struct ubicom32_sha1_ctx {
u64 count; /* message length */
u32 state[5];
u8 buf[2 * SHA1_BLOCK_SIZE];
};
static inline void sha1_clear_2ws(u8 *buf, int wc)
{
asm volatile (
"1: move.4 (%0)4++, #0 \n\t"
" move.4 (%0)4++, #0 \n\t"
" sub.4 %1, #2, %1 \n\t"
" jmple.f 1b \n\t"
:
: "a" (buf), "d" (wc)
: "cc"
);
}
/* only wipe out count, state, and 1st half of buf - 9 bytes at most */
#define sha1_wipe_out(sctx) sha1_clear_2ws((u8 *)sctx, 2 + 5 + 16 - 2)
static inline void sha1_init_digest(u32 *digest)
{
hw_crypto_set_ctrl(HASH_SECURITY_BLOCK_CONTROL_INIT_SHA1);
asm volatile (
" ; move digests to hash_output regs \n\t"
" move.4 0x70(%0), 0x0(%1) \n\t"
" move.4 0x74(%0), 0x4(%1) \n\t"
" move.4 0x78(%0), 0x8(%1) \n\t"
" move.4 0x7c(%0), 0xc(%1) \n\t"
" move.4 0x80(%0), 0x10(%1) \n\t"
:
: "a" (SEC_BASE), "a" (digest)
);
}
static inline void sha1_transform_feed(const u8 *in)
{
asm volatile (
" ; write the 1st 16 bytes \n\t"
" move.4 0x30(%0), 0x0(%1) \n\t"
" move.4 0x34(%0), 0x4(%1) \n\t"
" move.4 0x38(%0), 0x8(%1) \n\t"
" move.4 0x3c(%0), 0xc(%1) \n\t"
" move.4 0x40(%0), %1 \n\t"
" ; write the 2nd 16 bytes \n\t"
" move.4 0x30(%0), 0x10(%1) \n\t"
" move.4 0x34(%0), 0x14(%1) \n\t"
" move.4 0x38(%0), 0x18(%1) \n\t"
" move.4 0x3c(%0), 0x1c(%1) \n\t"
" move.4 0x40(%0), %1 \n\t"
" ; write the 3rd 16 bytes \n\t"
" move.4 0x30(%0), 0x20(%1) \n\t"
" move.4 0x34(%0), 0x24(%1) \n\t"
" move.4 0x38(%0), 0x28(%1) \n\t"
" move.4 0x3c(%0), 0x2c(%1) \n\t"
" move.4 0x40(%0), %1 \n\t"
" ; write the 4th 16 bytes \n\t"
" move.4 0x30(%0), 0x30(%1) \n\t"
" move.4 0x34(%0), 0x34(%1) \n\t"
" move.4 0x38(%0), 0x38(%1) \n\t"
" move.4 0x3c(%0), 0x3c(%1) \n\t"
" move.4 0x40(%0), %1 \n\t"
" pipe_flush 0 \n\t"
:
: "a"(SEC_BASE), "a"(in)
);
}
static inline void sha1_transform_wait(void)
{
asm volatile (
" btst 0x04(%0), #0 \n\t"
" jmpne.f -4 \n\t"
:
: "a"(SEC_BASE)
: "cc"
);
}
static inline void sha1_output_digest(u32 *digest)
{
asm volatile (
" move.4 0x0(%1), 0x70(%0) \n\t"
" move.4 0x4(%1), 0x74(%0) \n\t"
" move.4 0x8(%1), 0x78(%0) \n\t"
" move.4 0xc(%1), 0x7c(%0) \n\t"
" move.4 0x10(%1), 0x80(%0) \n\t"
:
: "a" (SEC_BASE), "a" (digest)
);
}
static __ocm_text void sha1_init(struct crypto_tfm *tfm)
{
struct ubicom32_sha1_ctx *sctx = crypto_tfm_ctx(tfm);
sctx->state[0] = SHA1_H0;
sctx->state[1] = SHA1_H1;
sctx->state[2] = SHA1_H2;
sctx->state[3] = SHA1_H3;
sctx->state[4] = SHA1_H4;
sctx->count = 0;
}
static void __ocm_text sha1_update(struct crypto_tfm *tfm, const u8 *data,
unsigned int len)
{
struct ubicom32_sha1_ctx *sctx = crypto_tfm_ctx(tfm);
int index, clen;
/* how much is already in the buffer? */
index = sctx->count & 0x3f;
sctx->count += len;
if (index + len < SHA1_BLOCK_SIZE) {
goto store_only;
}
hw_crypto_lock();
hw_crypto_check();
/* init digest set ctrl register too */
sha1_init_digest(sctx->state);
if (unlikely(index == 0 && SEC_ALIGNED(data))) {
fast_process:
#if CRYPTO_UBICOM32_LOOP_ASM
if (likely(len >= SHA1_BLOCK_SIZE)) {
register unsigned int cnt = len >> 6; // loop = len / 64;
sha1_transform_feed(data);
data += SHA1_BLOCK_SIZE;
/* cnt is pre-decremented in the loop */
asm volatile (
"; while (--loop): work on 2nd block \n\t"
"1: add.4 %2, #-1, %2 \n\t"
" jmpeq.f 5f \n\t"
" \n\t"
" ; write the 1st 16 bytes \n\t"
" move.4 0x30(%1), (%0)4++ \n\t"
" move.4 0x34(%1), (%0)4++ \n\t"
" move.4 0x38(%1), (%0)4++ \n\t"
" move.4 0x3c(%1), (%0)4++ \n\t"
" ; can not kick off hw before it \n\t"
" ; is done with the prev block \n\t"
" \n\t"
" btst 0x04(%1), #0 \n\t"
" jmpne.f -4 \n\t"
" \n\t"
" ; tell hw to load 1st 16 bytes \n\t"
" move.4 0x40(%1), %2 \n\t"
" \n\t"
" ; write the 2nd 16 bytes \n\t"
" move.4 0x30(%1), (%0)4++ \n\t"
" move.4 0x34(%1), (%0)4++ \n\t"
" move.4 0x38(%1), (%0)4++ \n\t"
" move.4 0x3c(%1), (%0)4++ \n\t"
" move.4 0x40(%1), %2 \n\t"
" \n\t"
" ; write the 3rd 16 bytes \n\t"
" move.4 0x30(%1), (%0)4++ \n\t"
" move.4 0x34(%1), (%0)4++ \n\t"
" move.4 0x38(%1), (%0)4++ \n\t"
" move.4 0x3c(%1), (%0)4++ \n\t"
" move.4 0x40(%1), %2 \n\t"
" \n\t"
" ; write the 4th 16 bytes \n\t"
" move.4 0x30(%1), (%0)4++ \n\t"
" move.4 0x34(%1), (%0)4++ \n\t"
" move.4 0x38(%1), (%0)4++ \n\t"
" move.4 0x3c(%1), (%0)4++ \n\t"
" move.4 0x40(%1), %2 \n\t"
" \n\t"
"; no need flush, enough insts \n\t"
"; before next hw wait \n\t"
" \n\t"
"; go back to loop \n\t"
" jmpt 1b \n\t"
" \n\t"
"; wait hw for last block \n\t"
"5: btst 0x04(%1), #0 \n\t"
" jmpne.f -4 \n\t"
" \n\t"
: "+a" (data)
: "a"( SEC_BASE), "d" (cnt)
: "cc"
);
len = len & (64 - 1);
}
#else
while (likely(len >= SHA1_BLOCK_SIZE)) {
sha1_transform_feed(data);
data += SHA1_BLOCK_SIZE;
len -= SHA1_BLOCK_SIZE;
sha1_transform_wait();
}
#endif
goto store;
}
/* process one stored block */
if (index) {
clen = SHA1_BLOCK_SIZE - index;
memcpy(sctx->buf + index, data, clen);
sha1_transform_feed(sctx->buf);
data += clen;
len -= clen;
index = 0;
sha1_transform_wait();
}
if (likely(SEC_ALIGNED(data))) {
goto fast_process;
}
/* process as many blocks as possible */
if (likely(len >= SHA1_BLOCK_SIZE)) {
memcpy(sctx->buf, data, SHA1_BLOCK_SIZE);
do {
sha1_transform_feed(sctx->buf);
data += SHA1_BLOCK_SIZE;
len -= SHA1_BLOCK_SIZE;
if (likely(len >= SHA1_BLOCK_SIZE)) {
memcpy(sctx->buf, data, SHA1_BLOCK_SIZE);
sha1_transform_wait();
continue;
}
/* it is the last block */
sha1_transform_wait();
break;
} while (1);
}
store:
sha1_output_digest(sctx->state);
hw_crypto_unlock();
store_only:
/* anything left? */
if (len)
memcpy(sctx->buf + index , data, len);
}
/* Add padding and return the message digest. */
static void __ocm_text sha1_final(struct crypto_tfm *tfm, u8 *out)
{
struct ubicom32_sha1_ctx *sctx = crypto_tfm_ctx(tfm);
u64 bits;
unsigned int index, end;
/* must perform manual padding */
index = sctx->count & 0x3f;
end = (index < 56) ? SHA1_BLOCK_SIZE : (2 * SHA1_BLOCK_SIZE);
/* start pad with 1 */
sctx->buf[index] = 0x80;
/* pad with zeros */
index++;
memset(sctx->buf + index, 0x00, end - index - 8);
/* append message length */
bits = sctx->count << 3 ;
SEC_COPY_2W(sctx->buf + end - 8, &bits);
/* force to use the sctx->buf and ignore the partial buf */
sctx->count = sctx->count & ~0x3f;
sha1_update(tfm, sctx->buf, end);
/* copy digest to out */
SEC_COPY_5W(out, sctx->state);
/* wipe context */
sha1_wipe_out(sctx);
}
static struct crypto_alg alg = {
.cra_name = "sha1",
.cra_driver_name= "sha1-ubicom32",
.cra_priority = CRYPTO_UBICOM32_PRIORITY,
.cra_flags = CRYPTO_ALG_TYPE_DIGEST,
.cra_blocksize = SHA1_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct ubicom32_sha1_ctx),
.cra_module = THIS_MODULE,
.cra_list = LIST_HEAD_INIT(alg.cra_list),
.cra_u = {
.digest = {
.dia_digestsize = SHA1_DIGEST_SIZE,
.dia_init = sha1_init,
.dia_update = sha1_update,
.dia_final = sha1_final,
}
}
};
static int __init init(void)
{
hw_crypto_init();
return crypto_register_alg(&alg);
}
static void __exit fini(void)
{
crypto_unregister_alg(&alg);
}
module_init(init);
module_exit(fini);
MODULE_ALIAS("sha1");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
|
