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/*
* sun4i-ss-hash.c - hardware cryptographic accelerator for Allwinner A20 SoC
*
* Copyright (C) 2013-2015 Corentin LABBE <clabbe.montjoie@gmail.com>
*
* This file add support for MD5 and SHA1.
*
* You could find the datasheet in Documentation/arm/sunxi/README
*
* 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.
*/
#include "sun4i-ss.h"
#include <linux/scatterlist.h>
/* This is a totally arbitrary value */
#define SS_TIMEOUT 100
int sun4i_hash_crainit(struct crypto_tfm *tfm)
{
struct sun4i_tfm_ctx *op = crypto_tfm_ctx(tfm);
struct ahash_alg *alg = __crypto_ahash_alg(tfm->__crt_alg);
struct sun4i_ss_alg_template *algt;
memset(op, 0, sizeof(struct sun4i_tfm_ctx));
algt = container_of(alg, struct sun4i_ss_alg_template, alg.hash);
op->ss = algt->ss;
crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
sizeof(struct sun4i_req_ctx));
return 0;
}
/* sun4i_hash_init: initialize request context */
int sun4i_hash_init(struct ahash_request *areq)
{
struct sun4i_req_ctx *op = ahash_request_ctx(areq);
struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
struct ahash_alg *alg = __crypto_ahash_alg(tfm->base.__crt_alg);
struct sun4i_ss_alg_template *algt;
memset(op, 0, sizeof(struct sun4i_req_ctx));
algt = container_of(alg, struct sun4i_ss_alg_template, alg.hash);
op->mode = algt->mode;
return 0;
}
int sun4i_hash_export_md5(struct ahash_request *areq, void *out)
{
struct sun4i_req_ctx *op = ahash_request_ctx(areq);
struct md5_state *octx = out;
int i;
octx->byte_count = op->byte_count + op->len;
memcpy(octx->block, op->buf, op->len);
if (op->byte_count > 0) {
for (i = 0; i < 4; i++)
octx->hash[i] = op->hash[i];
} else {
octx->hash[0] = SHA1_H0;
octx->hash[1] = SHA1_H1;
octx->hash[2] = SHA1_H2;
octx->hash[3] = SHA1_H3;
}
return 0;
}
int sun4i_hash_import_md5(struct ahash_request *areq, const void *in)
{
struct sun4i_req_ctx *op = ahash_request_ctx(areq);
const struct md5_state *ictx = in;
int i;
sun4i_hash_init(areq);
op->byte_count = ictx->byte_count & ~0x3F;
op->len = ictx->byte_count & 0x3F;
memcpy(op->buf, ictx->block, op->len);
for (i = 0; i < 4; i++)
op->hash[i] = ictx->hash[i];
return 0;
}
int sun4i_hash_export_sha1(struct ahash_request *areq, void *out)
{
struct sun4i_req_ctx *op = ahash_request_ctx(areq);
struct sha1_state *octx = out;
int i;
octx->count = op->byte_count + op->len;
memcpy(octx->buffer, op->buf, op->len);
if (op->byte_count > 0) {
for (i = 0; i < 5; i++)
octx->state[i] = op->hash[i];
} else {
octx->state[0] = SHA1_H0;
octx->state[1] = SHA1_H1;
octx->state[2] = SHA1_H2;
octx->state[3] = SHA1_H3;
octx->state[4] = SHA1_H4;
}
return 0;
}
int sun4i_hash_import_sha1(struct ahash_request *areq, const void *in)
{
struct sun4i_req_ctx *op = ahash_request_ctx(areq);
const struct sha1_state *ictx = in;
int i;
sun4i_hash_init(areq);
op->byte_count = ictx->count & ~0x3F;
op->len = ictx->count & 0x3F;
memcpy(op->buf, ictx->buffer, op->len);
for (i = 0; i < 5; i++)
op->hash[i] = ictx->state[i];
return 0;
}
#define SS_HASH_UPDATE 1
#define SS_HASH_FINAL 2
/*
* sun4i_hash_update: update hash engine
*
* Could be used for both SHA1 and MD5
* Write data by step of 32bits and put then in the SS.
*
* Since we cannot leave partial data and hash state in the engine,
* we need to get the hash state at the end of this function.
* We can get the hash state every 64 bytes
*
* So the first work is to get the number of bytes to write to SS modulo 64
* The extra bytes will go to a temporary buffer op->buf storing op->len bytes
*
* So at the begin of update()
* if op->len + areq->nbytes < 64
* => all data will be written to wait buffer (op->buf) and end=0
* if not, write all data from op->buf to the device and position end to
* complete to 64bytes
*
* example 1:
* update1 60o => op->len=60
* update2 60o => need one more word to have 64 bytes
* end=4
* so write all data from op->buf and one word of SGs
* write remaining data in op->buf
* final state op->len=56
*/
static int sun4i_hash(struct ahash_request *areq)
{
/*
* i is the total bytes read from SGs, to be compared to areq->nbytes
* i is important because we cannot rely on SG length since the sum of
* SG->length could be greater than areq->nbytes
*
* end is the position when we need to stop writing to the device,
* to be compared to i
*
* in_i: advancement in the current SG
*/
unsigned int i = 0, end, index, padlen, nwait, nbw = 0, j = 0, todo;
unsigned int in_i = 0;
u32 spaces, rx_cnt = SS_RX_DEFAULT, bf[32], wb = 0, v, ivmode = 0;
struct sun4i_req_ctx *op = ahash_request_ctx(areq);
struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
struct sun4i_tfm_ctx *tfmctx = crypto_ahash_ctx(tfm);
struct sun4i_ss_ctx *ss = tfmctx->ss;
struct scatterlist *in_sg = areq->src;
struct sg_mapping_iter mi;
int in_r, err = 0, zeros;
size_t copied = 0;
__be64 bits;
dev_dbg(ss->dev, "%s %s bc=%llu len=%u mode=%x wl=%u h0=%0x",
__func__, crypto_tfm_alg_name(areq->base.tfm),
op->byte_count, areq->nbytes, op->mode,
op->len, op->hash[0]);
if (unlikely(areq->nbytes == 0) && (op->flags & SS_HASH_FINAL) == 0)
return 0;
/* protect against overflow */
if (unlikely(areq->nbytes > UINT_MAX - op->len)) {
dev_err(ss->dev, "Cannot process too large request\n");
return -EINVAL;
}
if (op->len + areq->nbytes < 64 && (op->flags & SS_HASH_FINAL) == 0) {
/* linearize data to op->buf */
copied = sg_pcopy_to_buffer(areq->src, sg_nents(areq->src),
op->buf + op->len, areq->nbytes, 0);
op->len += copied;
return 0;
}
spin_lock_bh(&ss->slock);
/*
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