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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/s390/crypto/sha256_s390.c
10817 views
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/*

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 * Cryptographic API.

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 *

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 * s390 implementation of the SHA256 Secure Hash Algorithm.

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 *

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 * s390 Version:

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 *   Copyright IBM Corp. 2005,2007

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 *   Author(s): Jan Glauber ([email protected])

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 *

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 * Derived from "crypto/sha256_generic.c"

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 * and "arch/s390/crypto/sha1_s390.c"

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 *

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 * This program is free software; you can redistribute it and/or modify it

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 * under the terms of the GNU General Public License as published by the Free

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 * Software Foundation; either version 2 of the License, or (at your option)

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 * any later version.

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 *

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 */

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#include <crypto/internal/hash.h>

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#include <linux/init.h>

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#include <linux/module.h>

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#include <crypto/sha.h>

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#include "crypt_s390.h"

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#include "sha.h"

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static int sha256_init(struct shash_desc *desc)

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{

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	struct s390_sha_ctx *sctx = shash_desc_ctx(desc);

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	sctx->state[0] = SHA256_H0;

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	sctx->state[1] = SHA256_H1;

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	sctx->state[2] = SHA256_H2;

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	sctx->state[3] = SHA256_H3;

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	sctx->state[4] = SHA256_H4;

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	sctx->state[5] = SHA256_H5;

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	sctx->state[6] = SHA256_H6;

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	sctx->state[7] = SHA256_H7;

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	sctx->count = 0;

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	sctx->func = KIMD_SHA_256;

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	return 0;

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}

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static int sha256_export(struct shash_desc *desc, void *out)

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{

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	struct s390_sha_ctx *sctx = shash_desc_ctx(desc);

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	struct sha256_state *octx = out;

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	octx->count = sctx->count;

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	memcpy(octx->state, sctx->state, sizeof(octx->state));

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	memcpy(octx->buf, sctx->buf, sizeof(octx->buf));

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	return 0;

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}

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static int sha256_import(struct shash_desc *desc, const void *in)

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{

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	struct s390_sha_ctx *sctx = shash_desc_ctx(desc);

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	const struct sha256_state *ictx = in;

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	sctx->count = ictx->count;

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	memcpy(sctx->state, ictx->state, sizeof(ictx->state));

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	memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));

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	sctx->func = KIMD_SHA_256;

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	return 0;

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}

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static struct shash_alg alg = {

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	.digestsize	=	SHA256_DIGEST_SIZE,

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	.init		=	sha256_init,

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	.update		=	s390_sha_update,

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	.final		=	s390_sha_final,

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	.export		=	sha256_export,

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	.import		=	sha256_import,

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	.descsize	=	sizeof(struct s390_sha_ctx),

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	.statesize	=	sizeof(struct sha256_state),

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	.base		=	{

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		.cra_name	=	"sha256",

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		.cra_driver_name=	"sha256-s390",

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		.cra_priority	=	CRYPT_S390_PRIORITY,

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		.cra_flags	=	CRYPTO_ALG_TYPE_SHASH,

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		.cra_blocksize	=	SHA256_BLOCK_SIZE,

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		.cra_module	=	THIS_MODULE,

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	}

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};

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static int sha256_s390_init(void)

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{

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	if (!crypt_s390_func_available(KIMD_SHA_256, CRYPT_S390_MSA))

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		return -EOPNOTSUPP;

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	return crypto_register_shash(&alg);

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}

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static void __exit sha256_s390_fini(void)

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{

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	crypto_unregister_shash(&alg);

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}

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module_init(sha256_s390_init);

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module_exit(sha256_s390_fini);

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MODULE_ALIAS("sha256");

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MODULE_LICENSE("GPL");

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MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm");

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