sha1_s390.c

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/*
 * Cryptographic API.
 *
 * s390 implementation of the SHA1 Secure Hash Algorithm.
 *
 * Derived from cryptoapi implementation, adapted for in-place
 * scatterlist interface.  Originally based on the public domain
 * implementation written by Steve Reid.
 *
 * s390 Version:
 *   Copyright IBM Corp. 2003, 2007
 *   Author(s): Thomas Spatzier
 *      Jan Glauber ([email protected])
 *
 * Derived from "crypto/sha1_generic.c"
 *   Copyright (c) Alan Smithee.
 *   Copyright (c) Andrew McDonald <[email protected]>
 *   Copyright (c) Jean-Francois Dive <[email protected]>
 *
 * 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 <crypto/internal/hash.h>
#include <linux/init.h>
#include <linux/module.h>
#include <crypto/sha.h>

#include "crypt_s390.h"
#include "sha.h"

static int sha1_init(struct shash_desc *desc)
{
    struct s390_sha_ctx *sctx = shash_desc_ctx(desc);

    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;
    sctx->func = KIMD_SHA_1;

    return 0;
}

static int sha1_export(struct shash_desc *desc, void *out)
{
    struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
    struct sha1_state *octx = out;

    octx->count = sctx->count;
    memcpy(octx->state, sctx->state, sizeof(octx->state));
    memcpy(octx->buffer, sctx->buf, sizeof(octx->buffer));
    return 0;
}

static int sha1_import(struct shash_desc *desc, const void *in)
{
    struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
    const struct sha1_state *ictx = in;

    sctx->count = ictx->count;
    memcpy(sctx->state, ictx->state, sizeof(ictx->state));
    memcpy(sctx->buf, ictx->buffer, sizeof(ictx->buffer));
    sctx->func = KIMD_SHA_1;
    return 0;
}

static struct shash_alg alg = {
    .digestsize =   SHA1_DIGEST_SIZE,
    .init       =   sha1_init,
    .update     =   s390_sha_update,
    .final      =   s390_sha_final,
    .export     =   sha1_export,
    .import     =   sha1_import,
    .descsize   =   sizeof(struct s390_sha_ctx),
    .statesize  =   sizeof(struct sha1_state),
    .base       =   {
        .cra_name   =   "sha1",
        .cra_driver_name=   "sha1-s390",
        .cra_priority   =   CRYPT_S390_PRIORITY,
        .cra_flags  =   CRYPTO_ALG_TYPE_SHASH,
        .cra_blocksize  =   SHA1_BLOCK_SIZE,
        .cra_module =   THIS_MODULE,
    }
};

static int __init sha1_s390_init(void)
{
    if (!crypt_s390_func_available(KIMD_SHA_1, CRYPT_S390_MSA))
        return -EOPNOTSUPP;
    return crypto_register_shash(&alg);
}

static void __exit sha1_s390_fini(void)
{
    crypto_unregister_shash(&alg);
}

module_init(sha1_s390_init);
module_exit(sha1_s390_fini);

MODULE_ALIAS("sha1");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");