sha256_s390.c

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/*
 * Cryptographic API.
 *
 * s390 implementation of the SHA256 and SHA224 Secure Hash Algorithm.
 *
 * s390 Version:
 *   Copyright IBM Corp. 2005, 2011
 *   Author(s): Jan Glauber ([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 sha256_init(struct shash_desc *desc)
{
    struct s390_sha_ctx *sctx = shash_desc_ctx(desc);

    sctx->state[0] = SHA256_H0;
    sctx->state[1] = SHA256_H1;
    sctx->state[2] = SHA256_H2;
    sctx->state[3] = SHA256_H3;
    sctx->state[4] = SHA256_H4;
    sctx->state[5] = SHA256_H5;
    sctx->state[6] = SHA256_H6;
    sctx->state[7] = SHA256_H7;
    sctx->count = 0;
    sctx->func = KIMD_SHA_256;

    return 0;
}

static int sha256_export(struct shash_desc *desc, void *out)
{
    struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
    struct sha256_state *octx = out;

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

static int sha256_import(struct shash_desc *desc, const void *in)
{
    struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
    const struct sha256_state *ictx = in;

    sctx->count = ictx->count;
    memcpy(sctx->state, ictx->state, sizeof(ictx->state));
    memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
    sctx->func = KIMD_SHA_256;
    return 0;
}

static struct shash_alg sha256_alg = {
    .digestsize =   SHA256_DIGEST_SIZE,
    .init       =   sha256_init,
    .update     =   s390_sha_update,
    .final      =   s390_sha_final,
    .export     =   sha256_export,
    .import     =   sha256_import,
    .descsize   =   sizeof(struct s390_sha_ctx),
    .statesize  =   sizeof(struct sha256_state),
    .base       =   {
        .cra_name   =   "sha256",
        .cra_driver_name=   "sha256-s390",
        .cra_priority   =   CRYPT_S390_PRIORITY,
        .cra_flags  =   CRYPTO_ALG_TYPE_SHASH,
        .cra_blocksize  =   SHA256_BLOCK_SIZE,
        .cra_module =   THIS_MODULE,
    }
};

static int sha224_init(struct shash_desc *desc)
{
    struct s390_sha_ctx *sctx = shash_desc_ctx(desc);

    sctx->state[0] = SHA224_H0;
    sctx->state[1] = SHA224_H1;
    sctx->state[2] = SHA224_H2;
    sctx->state[3] = SHA224_H3;
    sctx->state[4] = SHA224_H4;
    sctx->state[5] = SHA224_H5;
    sctx->state[6] = SHA224_H6;
    sctx->state[7] = SHA224_H7;
    sctx->count = 0;
    sctx->func = KIMD_SHA_256;

    return 0;
}

static struct shash_alg sha224_alg = {
    .digestsize =   SHA224_DIGEST_SIZE,
    .init       =   sha224_init,
    .update     =   s390_sha_update,
    .final      =   s390_sha_final,
    .export     =   sha256_export,
    .import     =   sha256_import,
    .descsize   =   sizeof(struct s390_sha_ctx),
    .statesize  =   sizeof(struct sha256_state),
    .base       =   {
        .cra_name   =   "sha224",
        .cra_driver_name=   "sha224-s390",
        .cra_priority   =   CRYPT_S390_PRIORITY,
        .cra_flags  =   CRYPTO_ALG_TYPE_SHASH,
        .cra_blocksize  =   SHA224_BLOCK_SIZE,
        .cra_module =   THIS_MODULE,
    }
};

static int __init sha256_s390_init(void)
{
    int ret;

    if (!crypt_s390_func_available(KIMD_SHA_256, CRYPT_S390_MSA))
        return -EOPNOTSUPP;
    ret = crypto_register_shash(&sha256_alg);
    if (ret < 0)
        goto out;
    ret = crypto_register_shash(&sha224_alg);
    if (ret < 0)
        crypto_unregister_shash(&sha256_alg);
out:
    return ret;
}

static void __exit sha256_s390_fini(void)
{
    crypto_unregister_shash(&sha224_alg);
    crypto_unregister_shash(&sha256_alg);
}

module_init(sha256_s390_init);
module_exit(sha256_s390_fini);

MODULE_ALIAS("sha256");
MODULE_ALIAS("sha224");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("SHA256 and SHA224 Secure Hash Algorithm");