Commit 0a497c17 authored by Jan Glauber's avatar Jan Glauber Committed by Linus Torvalds
Browse files

[PATCH] s390: sha256 support



Add support for the hardware accelerated sha256 crypto algorithm.
Signed-off-by: default avatarJan Glauber <jan.glauber@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent c1e26e1e
......@@ -3,6 +3,7 @@
#
obj-$(CONFIG_CRYPTO_SHA1_S390) += sha1_s390.o
obj-$(CONFIG_CRYPTO_SHA256_S390) += sha256_s390.o
obj-$(CONFIG_CRYPTO_DES_S390) += des_s390.o des_check_key.o
obj-$(CONFIG_CRYPTO_TEST) += crypt_s390_query.o
......@@ -61,6 +61,7 @@ enum crypt_s390_kmc_func {
enum crypt_s390_kimd_func {
KIMD_QUERY = CRYPT_S390_KIMD | 0,
KIMD_SHA_1 = CRYPT_S390_KIMD | 1,
KIMD_SHA_256 = CRYPT_S390_KIMD | 2,
};
/* function codes for KLMD (COMPUTE LAST MESSAGE DIGEST)
......@@ -69,6 +70,7 @@ enum crypt_s390_kimd_func {
enum crypt_s390_klmd_func {
KLMD_QUERY = CRYPT_S390_KLMD | 0,
KLMD_SHA_1 = CRYPT_S390_KLMD | 1,
KLMD_SHA_256 = CRYPT_S390_KLMD | 2,
};
/* function codes for KMAC (COMPUTE MESSAGE AUTHENTICATION CODE)
......
......@@ -48,16 +48,20 @@ static void query_available_functions(void)
crypt_s390_func_available(KIMD_QUERY));
printk(KERN_INFO "KIMD_SHA_1: %d\n",
crypt_s390_func_available(KIMD_SHA_1));
printk(KERN_INFO "KIMD_SHA_256: %d\n",
crypt_s390_func_available(KIMD_SHA_256));
/* query available KLMD functions */
printk(KERN_INFO "KLMD_QUERY: %d\n",
crypt_s390_func_available(KLMD_QUERY));
printk(KERN_INFO "KLMD_SHA_1: %d\n",
crypt_s390_func_available(KLMD_SHA_1));
printk(KERN_INFO "KLMD_SHA_256: %d\n",
crypt_s390_func_available(KLMD_SHA_256));
/* query available KMAC functions */
printk(KERN_INFO "KMAC_QUERY: %d\n",
crypt_s3990_func_available(KMAC_QUERY));
crypt_s390_func_available(KMAC_QUERY));
printk(KERN_INFO "KMAC_DEA: %d\n",
crypt_s390_func_available(KMAC_DEA));
printk(KERN_INFO "KMAC_TDEA_128: %d\n",
......
/*
* Cryptographic API.
*
* s390 implementation of the SHA256 Secure Hash Algorithm.
*
* s390 Version:
* Copyright (C) 2005 IBM Deutschland GmbH, IBM Corporation
* Author(s): Jan Glauber (jang@de.ibm.com)
*
* Derived from "crypto/sha256.c"
* and "arch/s390/crypto/sha1_s390.c"
*
* 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/module.h>
#include <linux/crypto.h>
#include "crypt_s390.h"
#define SHA256_DIGEST_SIZE 32
#define SHA256_BLOCK_SIZE 64
struct s390_sha256_ctx {
u64 count;
u32 state[8];
u8 buf[2 * SHA256_BLOCK_SIZE];
};
static void sha256_init(void *ctx)
{
struct s390_sha256_ctx *sctx = ctx;
sctx->state[0] = 0x6a09e667;
sctx->state[1] = 0xbb67ae85;
sctx->state[2] = 0x3c6ef372;
sctx->state[3] = 0xa54ff53a;
sctx->state[4] = 0x510e527f;
sctx->state[5] = 0x9b05688c;
sctx->state[6] = 0x1f83d9ab;
sctx->state[7] = 0x5be0cd19;
sctx->count = 0;
memset(sctx->buf, 0, sizeof(sctx->buf));
}
static void sha256_update(void *ctx, const u8 *data, unsigned int len)
{
struct s390_sha256_ctx *sctx = ctx;
unsigned int index;
/* how much is already in the buffer? */
index = sctx->count / 8 & 0x3f;
/* update message bit length */
sctx->count += len * 8;
/* process one block */
if ((index + len) >= SHA256_BLOCK_SIZE) {
memcpy(sctx->buf + index, data, SHA256_BLOCK_SIZE - index);
crypt_s390_kimd(KIMD_SHA_256, sctx->state, sctx->buf,
SHA256_BLOCK_SIZE);
data += SHA256_BLOCK_SIZE - index;
len -= SHA256_BLOCK_SIZE - index;
}
/* anything left? */
if (len)
memcpy(sctx->buf + index , data, len);
}
static void pad_message(struct s390_sha256_ctx* sctx)
{
int index, end;
index = sctx->count / 8 & 0x3f;
end = index < 56 ? SHA256_BLOCK_SIZE : 2 * SHA256_BLOCK_SIZE;
/* start pad with 1 */
sctx->buf[index] = 0x80;
/* pad with zeros */
index++;
memset(sctx->buf + index, 0x00, end - index - 8);
/* append message length */
memcpy(sctx->buf + end - 8, &sctx->count, sizeof sctx->count);
sctx->count = end * 8;
}
/* Add padding and return the message digest */
static void sha256_final(void* ctx, u8 *out)
{
struct s390_sha256_ctx *sctx = ctx;
/* must perform manual padding */
pad_message(sctx);
crypt_s390_kimd(KIMD_SHA_256, sctx->state, sctx->buf,
sctx->count / 8);
/* copy digest to out */
memcpy(out, sctx->state, SHA256_DIGEST_SIZE);
/* wipe context */
memset(sctx, 0, sizeof *sctx);
}
static struct crypto_alg alg = {
.cra_name = "sha256",
.cra_flags = CRYPTO_ALG_TYPE_DIGEST,
.cra_blocksize = SHA256_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct s390_sha256_ctx),
.cra_module = THIS_MODULE,
.cra_list = LIST_HEAD_INIT(alg.cra_list),
.cra_u = { .digest = {
.dia_digestsize = SHA256_DIGEST_SIZE,
.dia_init = sha256_init,
.dia_update = sha256_update,
.dia_final = sha256_final } }
};
static int init(void)
{
int ret;
if (!crypt_s390_func_available(KIMD_SHA_256))
return -ENOSYS;
ret = crypto_register_alg(&alg);
if (ret != 0)
printk(KERN_INFO "crypt_s390: sha256_s390 couldn't be loaded.");
return ret;
}
static void __exit fini(void)
{
crypto_unregister_alg(&alg);
}
module_init(init);
module_exit(fini);
MODULE_ALIAS("sha256");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm");
......@@ -634,6 +634,7 @@ CONFIG_CRYPTO=y
# CONFIG_CRYPTO_SHA1 is not set
# CONFIG_CRYPTO_SHA1_S390 is not set
# CONFIG_CRYPTO_SHA256 is not set
# CONFIG_CRYPTO_SHA256_S390 is not set
# CONFIG_CRYPTO_SHA512 is not set
# CONFIG_CRYPTO_WP512 is not set
# CONFIG_CRYPTO_TGR192 is not set
......
......@@ -44,6 +44,7 @@ config CRYPTO_SHA1_S390
tristate "SHA1 digest algorithm (s390)"
depends on CRYPTO && ARCH_S390
help
This is the s390 hardware accelerated implementation of the
SHA-1 secure hash standard (FIPS 180-1/DFIPS 180-2).
config CRYPTO_SHA256
......@@ -55,6 +56,16 @@ config CRYPTO_SHA256
This version of SHA implements a 256 bit hash with 128 bits of
security against collision attacks.
config CRYPTO_SHA256_S390
tristate "SHA256 digest algorithm (s390)"
depends on CRYPTO && ARCH_S390
help
This is the s390 hardware accelerated implementation of the
SHA256 secure hash standard (DFIPS 180-2).
This version of SHA implements a 256 bit hash with 128 bits of
security against collision attacks.
config CRYPTO_SHA512
tristate "SHA384 and SHA512 digest algorithms"
depends on CRYPTO
......
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