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[PATCH] s390: des crypto code cleanup
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Beautify the s390 in-kernel-crypto des code.

Signed-off-by: Jan Glauber <jan.glauber@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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Jan Glauber authored and Linus Torvalds committed Jan 15, 2006
1 parent 7aa8974 commit c135783
Showing 1 changed file with 67 additions and 88 deletions.
155 changes: 67 additions & 88 deletions arch/s390/crypto/des_s390.c
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Original file line number Diff line number Diff line change
Expand Up @@ -15,10 +15,8 @@
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <asm/scatterlist.h>
#include <linux/crypto.h>

#include "crypt_s390.h"
#include "crypto_des.h"

Expand Down Expand Up @@ -46,37 +44,30 @@ struct crypt_s390_des3_192_ctx {
u8 key[DES3_192_KEY_SIZE];
};

static int
des_setkey(void *ctx, const u8 *key, unsigned int keylen, u32 *flags)
static int des_setkey(void *ctx, const u8 *key, unsigned int keylen,
u32 *flags)
{
struct crypt_s390_des_ctx *dctx;
struct crypt_s390_des_ctx *dctx = ctx;
int ret;

dctx = ctx;
//test if key is valid (not a weak key)
/* test if key is valid (not a weak key) */
ret = crypto_des_check_key(key, keylen, flags);
if (ret == 0){
if (ret == 0)
memcpy(dctx->key, key, keylen);
}
return ret;
}


static void
des_encrypt(void *ctx, u8 *dst, const u8 *src)
static void des_encrypt(void *ctx, u8 *dst, const u8 *src)
{
struct crypt_s390_des_ctx *dctx;
struct crypt_s390_des_ctx *dctx = ctx;

dctx = ctx;
crypt_s390_km(KM_DEA_ENCRYPT, dctx->key, dst, src, DES_BLOCK_SIZE);
}

static void
des_decrypt(void *ctx, u8 *dst, const u8 *src)
static void des_decrypt(void *ctx, u8 *dst, const u8 *src)
{
struct crypt_s390_des_ctx *dctx;
struct crypt_s390_des_ctx *dctx = ctx;

dctx = ctx;
crypt_s390_km(KM_DEA_DECRYPT, dctx->key, dst, src, DES_BLOCK_SIZE);
}

Expand All @@ -87,12 +78,15 @@ static struct crypto_alg des_alg = {
.cra_ctxsize = sizeof(struct crypt_s390_des_ctx),
.cra_module = THIS_MODULE,
.cra_list = LIST_HEAD_INIT(des_alg.cra_list),
.cra_u = { .cipher = {
.cia_min_keysize = DES_KEY_SIZE,
.cia_max_keysize = DES_KEY_SIZE,
.cia_setkey = des_setkey,
.cia_encrypt = des_encrypt,
.cia_decrypt = des_decrypt } }
.cra_u = {
.cipher = {
.cia_min_keysize = DES_KEY_SIZE,
.cia_max_keysize = DES_KEY_SIZE,
.cia_setkey = des_setkey,
.cia_encrypt = des_encrypt,
.cia_decrypt = des_decrypt
}
}
};

/*
Expand All @@ -107,20 +101,18 @@ static struct crypto_alg des_alg = {
* Implementers MUST reject keys that exhibit this property.
*
*/
static int
des3_128_setkey(void *ctx, const u8 *key, unsigned int keylen, u32 *flags)
static int des3_128_setkey(void *ctx, const u8 *key, unsigned int keylen,
u32 *flags)
{
int i, ret;
struct crypt_s390_des3_128_ctx *dctx;
struct crypt_s390_des3_128_ctx *dctx = ctx;
const u8* temp_key = key;

dctx = ctx;
if (!(memcmp(key, &key[DES_KEY_SIZE], DES_KEY_SIZE))) {

*flags |= CRYPTO_TFM_RES_BAD_KEY_SCHED;
return -EINVAL;
}
for (i = 0; i < 2; i++, temp_key += DES_KEY_SIZE) {
for (i = 0; i < 2; i++, temp_key += DES_KEY_SIZE) {
ret = crypto_des_check_key(temp_key, DES_KEY_SIZE, flags);
if (ret < 0)
return ret;
Expand All @@ -129,24 +121,20 @@ des3_128_setkey(void *ctx, const u8 *key, unsigned int keylen, u32 *flags)
return 0;
}

static void
des3_128_encrypt(void *ctx, u8 *dst, const u8 *src)
static void des3_128_encrypt(void *ctx, u8 *dst, const u8 *src)
{
struct crypt_s390_des3_128_ctx *dctx;
struct crypt_s390_des3_128_ctx *dctx = ctx;

dctx = ctx;
crypt_s390_km(KM_TDEA_128_ENCRYPT, dctx->key, dst, (void*)src,
DES3_128_BLOCK_SIZE);
DES3_128_BLOCK_SIZE);
}

static void
des3_128_decrypt(void *ctx, u8 *dst, const u8 *src)
static void des3_128_decrypt(void *ctx, u8 *dst, const u8 *src)
{
struct crypt_s390_des3_128_ctx *dctx;
struct crypt_s390_des3_128_ctx *dctx = ctx;

dctx = ctx;
crypt_s390_km(KM_TDEA_128_DECRYPT, dctx->key, dst, (void*)src,
DES3_128_BLOCK_SIZE);
DES3_128_BLOCK_SIZE);
}

static struct crypto_alg des3_128_alg = {
Expand All @@ -156,12 +144,15 @@ static struct crypto_alg des3_128_alg = {
.cra_ctxsize = sizeof(struct crypt_s390_des3_128_ctx),
.cra_module = THIS_MODULE,
.cra_list = LIST_HEAD_INIT(des3_128_alg.cra_list),
.cra_u = { .cipher = {
.cia_min_keysize = DES3_128_KEY_SIZE,
.cia_max_keysize = DES3_128_KEY_SIZE,
.cia_setkey = des3_128_setkey,
.cia_encrypt = des3_128_encrypt,
.cia_decrypt = des3_128_decrypt } }
.cra_u = {
.cipher = {
.cia_min_keysize = DES3_128_KEY_SIZE,
.cia_max_keysize = DES3_128_KEY_SIZE,
.cia_setkey = des3_128_setkey,
.cia_encrypt = des3_128_encrypt,
.cia_decrypt = des3_128_decrypt
}
}
};

/*
Expand All @@ -177,50 +168,43 @@ static struct crypto_alg des3_128_alg = {
* property.
*
*/
static int
des3_192_setkey(void *ctx, const u8 *key, unsigned int keylen, u32 *flags)
static int des3_192_setkey(void *ctx, const u8 *key, unsigned int keylen,
u32 *flags)
{
int i, ret;
struct crypt_s390_des3_192_ctx *dctx;
const u8* temp_key;
struct crypt_s390_des3_192_ctx *dctx = ctx;
const u8* temp_key = key;

dctx = ctx;
temp_key = key;
if (!(memcmp(key, &key[DES_KEY_SIZE], DES_KEY_SIZE) &&
memcmp(&key[DES_KEY_SIZE], &key[DES_KEY_SIZE * 2],
DES_KEY_SIZE))) {
DES_KEY_SIZE))) {

*flags |= CRYPTO_TFM_RES_BAD_KEY_SCHED;
return -EINVAL;
}
for (i = 0; i < 3; i++, temp_key += DES_KEY_SIZE) {
ret = crypto_des_check_key(temp_key, DES_KEY_SIZE, flags);
if (ret < 0){
if (ret < 0)
return ret;
}
}
memcpy(dctx->key, key, keylen);
return 0;
}

static void
des3_192_encrypt(void *ctx, u8 *dst, const u8 *src)
static void des3_192_encrypt(void *ctx, u8 *dst, const u8 *src)
{
struct crypt_s390_des3_192_ctx *dctx;
struct crypt_s390_des3_192_ctx *dctx = ctx;

dctx = ctx;
crypt_s390_km(KM_TDEA_192_ENCRYPT, dctx->key, dst, (void*)src,
DES3_192_BLOCK_SIZE);
DES3_192_BLOCK_SIZE);
}

static void
des3_192_decrypt(void *ctx, u8 *dst, const u8 *src)
static void des3_192_decrypt(void *ctx, u8 *dst, const u8 *src)
{
struct crypt_s390_des3_192_ctx *dctx;
struct crypt_s390_des3_192_ctx *dctx = ctx;

dctx = ctx;
crypt_s390_km(KM_TDEA_192_DECRYPT, dctx->key, dst, (void*)src,
DES3_192_BLOCK_SIZE);
DES3_192_BLOCK_SIZE);
}

static struct crypto_alg des3_192_alg = {
Expand All @@ -230,44 +214,39 @@ static struct crypto_alg des3_192_alg = {
.cra_ctxsize = sizeof(struct crypt_s390_des3_192_ctx),
.cra_module = THIS_MODULE,
.cra_list = LIST_HEAD_INIT(des3_192_alg.cra_list),
.cra_u = { .cipher = {
.cia_min_keysize = DES3_192_KEY_SIZE,
.cia_max_keysize = DES3_192_KEY_SIZE,
.cia_setkey = des3_192_setkey,
.cia_encrypt = des3_192_encrypt,
.cia_decrypt = des3_192_decrypt } }
.cra_u = {
.cipher = {
.cia_min_keysize = DES3_192_KEY_SIZE,
.cia_max_keysize = DES3_192_KEY_SIZE,
.cia_setkey = des3_192_setkey,
.cia_encrypt = des3_192_encrypt,
.cia_decrypt = des3_192_decrypt
}
}
};



static int
init(void)
static int init(void)
{
int ret;
int ret = 0;

if (!crypt_s390_func_available(KM_DEA_ENCRYPT) ||
!crypt_s390_func_available(KM_TDEA_128_ENCRYPT) ||
!crypt_s390_func_available(KM_TDEA_192_ENCRYPT)){
!crypt_s390_func_available(KM_TDEA_192_ENCRYPT))
return -ENOSYS;
}

ret = 0;
ret |= (crypto_register_alg(&des_alg) == 0)? 0:1;
ret |= (crypto_register_alg(&des3_128_alg) == 0)? 0:2;
ret |= (crypto_register_alg(&des3_192_alg) == 0)? 0:4;
if (ret){
ret |= (crypto_register_alg(&des_alg) == 0) ? 0:1;
ret |= (crypto_register_alg(&des3_128_alg) == 0) ? 0:2;
ret |= (crypto_register_alg(&des3_192_alg) == 0) ? 0:4;
if (ret) {
crypto_unregister_alg(&des3_192_alg);
crypto_unregister_alg(&des3_128_alg);
crypto_unregister_alg(&des_alg);
return -EEXIST;
}

printk(KERN_INFO "crypt_s390: des_s390 loaded.\n");
return 0;
}

static void __exit
fini(void)
static void __exit fini(void)
{
crypto_unregister_alg(&des3_192_alg);
crypto_unregister_alg(&des3_128_alg);
Expand Down

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