[PATCH] s390: des crypto code cleanup

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>

1 files changed, 67 insertions, 88 deletions

diff --git a/arch/s390/crypto/des_s390.c b/arch/s390/crypto/des_s390.c
index a38bb2a3eef6..f090c3c2745b 100644
--- a/arch/s390/crypto/des_s390.c
+++ b/arch/s390/crypto/des_s390.c
@@ -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"
 
@@ -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);
 }
 
@@ -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
+                }
+        }
 };
 
 /*
@@ -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;
@@ -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 = {
@@ -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
+                }
+        }
 };
 
 /*
@@ -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 = {
@@ -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);