linux-imx

// SPDX-License-Identifier: GPL-2.0-or-later

/*

 * algif_hash: User-space interface for hash algorithms

 *

 * This file provides the user-space API for hash algorithms.

 *

 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>

 */

​

#include <crypto/hash.h>

#include <crypto/if_alg.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/mm.h>

#include <linux/module.h>

#include <linux/net.h>

#include <net/sock.h>

​

struct hash_ctx {

    struct af_alg_sgl sgl;

​

    u8 *result;

​

    struct crypto_wait wait;

​

    unsigned int len;

    bool more;

​

    struct ahash_request req;

};

​

static int hash_alloc_result(struct sock *sk, struct hash_ctx *ctx)

{

    unsigned ds;

​

    if (ctx->result)

        return 0;

​

    ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));

​

    ctx->result = sock_kmalloc(sk, ds, GFP_KERNEL);

    if (!ctx->result)

        return -ENOMEM;

​

    memset(ctx->result, 0, ds);

​

    return 0;

}

​

static void hash_free_result(struct sock *sk, struct hash_ctx *ctx)

{

    unsigned ds;

​

    if (!ctx->result)

        return;

​

    ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));

​

    sock_kzfree_s(sk, ctx->result, ds);

    ctx->result = NULL;

}

​

static int hash_sendmsg(struct socket *sock, struct msghdr *msg,