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/*

 * Scatterlist Cryptographic API.

 *

 * Procfs information.

 *

 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>

 *

 * 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 <linux/init.h>

#include <linux/crypto.h>

#include <linux/rwsem.h>

#include <linux/proc_fs.h>

#include <linux/seq_file.h>

#include "internal.h"

extern struct list_head crypto_alg_list;

extern struct rw_semaphore crypto_alg_sem;

static void *c_start(struct seq_file *m, loff_t *pos)

{

        struct list_head *v;

        loff_t n = *pos;

        down_read(&crypto_alg_sem);

        list_for_each(v, &crypto_alg_list)

                if (!n--)

                        return list_entry(v, struct crypto_alg, cra_list);

        return NULL;

}

static void *c_next(struct seq_file *m, void *p, loff_t *pos)

{

        struct list_head *v = p;

        (*pos)++;

        v = v->next;

        return (v == &crypto_alg_list) ?

                NULL : list_entry(v, struct crypto_alg, cra_list);

}

static void c_stop(struct seq_file *m, void *p)

{

        up_read(&crypto_alg_sem);

}

static int c_show(struct seq_file *m, void *p)

{

        struct crypto_alg *alg = (struct crypto_alg *)p;

        seq_printf(m, "name         : %s\n", alg->cra_name);

        seq_printf(m, "module       : %s\n",

                   (alg->cra_module ?

                    alg->cra_module->name :

                    "kernel"));

        switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) {

        case CRYPTO_ALG_TYPE_CIPHER:

                seq_printf(m, "type         : cipher\n");

                seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);

                seq_printf(m, "min keysize  : %u\n",

                                        alg->cra_cipher.cia_min_keysize);

                seq_printf(m, "max keysize  : %u\n",

                                        alg->cra_cipher.cia_max_keysize);

                break;

        case CRYPTO_ALG_TYPE_DIGEST:

                seq_printf(m, "type         : digest\n");

                seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);

                seq_printf(m, "digestsize   : %u\n",

                           alg->cra_digest.dia_digestsize);

                break;

        case CRYPTO_ALG_TYPE_COMPRESS:

                seq_printf(m, "type         : compression\n");

                break;

        default:

                seq_printf(m, "type         : unknown\n");

                break;

        }

        seq_putc(m, '\n');

        return 0;

}

static struct seq_operations crypto_seq_ops = {

        .start          = c_start,

        .next           = c_next,

        .stop           = c_stop,

        .show           = c_show

};

static int crypto_info_open(struct inode *inode, struct file *file)

{

        return seq_open(file, &crypto_seq_ops);

}

static struct file_operations proc_crypto_ops = {

        .open           = crypto_info_open,

        .read           = seq_read,

        .llseek         = seq_lseek,

        .release        = seq_release

};

void __init crypto_init_proc(void)

{

        struct proc_dir_entry *proc;

        proc = create_proc_entry("crypto", 0, NULL);

        if (proc)

                proc->proc_fops = &proc_crypto_ops;

}