path: root/drivers/crypto/inside-secure/safexcel_hash.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2017 Marvell
 *
 * Antoine Tenart <antoine.tenart@free-electrons.com>
 */

#include <crypto/hmac.h>
#include <crypto/md5.h>
#include <crypto/sha.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/dmapool.h>

#include "safexcel.h"

struct safexcel_ahash_ctx {
	struct safexcel_context base;
	struct safexcel_crypto_priv *priv;

	u32 alg;

	u32 ipad[SHA512_DIGEST_SIZE / sizeof(u32)];
	u32 opad[SHA512_DIGEST_SIZE / sizeof(u32)];
};

struct safexcel_ahash_req {
	bool last_req;
	bool finish;
	bool hmac;
	bool needs_inv;

	int nents;
	dma_addr_t result_dma;

	u32 digest;

	u8 state_sz;    /* expected sate size, only set once */
	u32 state[SHA512_DIGEST_SIZE / sizeof(u32)] __aligned(sizeof(u32));

	u64 len[2];
	u64 processed[2];

	u8 cache[SHA512_BLOCK_SIZE] __aligned(sizeof(u32));
	dma_addr_t cache_dma;
	unsigned int cache_sz;

	u8 cache_next[SHA512_BLOCK_SIZE] __aligned(sizeof(u32));
};

static inline u64 safexcel_queued_len(struct safexcel_ahash_req *req)
{
	if (req->len[1] > req->processed[1])
		return 0xffffffff - (req->len[0] - req->processed[0]);

	return req->len[0] - req->processed[0];
}

static void safexcel_hash_token(struct safexcel_command_desc *cdesc,
				u32 input_length, u32 result_length)
{
	struct safexcel_token *token =
		(struct safexcel_token *)cdesc->control_data.token;

	token[0].opcode = EIP197_TOKEN_OPCODE_DIRECTION;
	token[0].packet_length = input_length;
	token[0].stat = EIP197_TOKEN_STAT_LAST_HASH;
	token[0].instructions = EIP197_TOKEN_INS_TYPE_HASH;

	token[1].opcode = EIP197_TOKEN_OPCODE_INSERT;
	token[1].packet_length = result_length;
	token[1].stat = EIP197_TOKEN_STAT_LAST_HASH |
			EIP197_TOKEN_STAT_LAST_PACKET;
	token[1].instructions = EIP197_TOKEN_INS_TYPE_OUTPUT |
				EIP197_TOKEN_INS_INSERT_HASH_DIGEST;
}

static void safexcel_context_control(struct safexcel_ahash_ctx *ctx,
				     struct safexcel_ahash_req *req,
				     struct safexcel_command_desc *cdesc,
				     unsigned int digestsize)
{
	struct safexcel_crypto_priv *priv = ctx->priv;
	int i;

	cdesc->control_data.control0 |= CONTEXT_CONTROL_TYPE_HASH_OUT;
	cdesc->control_data.control0 |= ctx->alg;
	cdesc->control_data.control0 |= req->digest;

	if (req->digest == CONTEXT_CONTROL_DIGEST_PRECOMPUTED) {
		if (req->processed[0] || req->processed[1]) {
			if (ctx->alg == CONTEXT_CONTROL_CRYPTO_ALG_MD5)
				cdesc->