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/*
* Cryptographic API.
*
* s390 implementation of the DES Cipher Algorithm.
*
* Copyright (c) 2003 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Author(s): Thomas Spatzier (tspat@de.ibm.com)
*
*
* 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/mm.h>
#include <linux/errno.h>
#include <asm/scatterlist.h>
#include <linux/crypto.h>
#include "crypt_s390.h"
#include "crypto_des.h"
#define DES_BLOCK_SIZE 8
#define DES_KEY_SIZE 8
#define DES3_128_KEY_SIZE (2 * DES_KEY_SIZE)
#define DES3_128_BLOCK_SIZE DES_BLOCK_SIZE
#define DES3_192_KEY_SIZE (3 * DES_KEY_SIZE)
#define DES3_192_BLOCK_SIZE DES_BLOCK_SIZE
struct crypt_s390_des_ctx {
u8 iv[DES_BLOCK_SIZE];
u8 key[DES_KEY_SIZE];
};
struct crypt_s390_des3_128_ctx {
u8 iv[DES_BLOCK_SIZE];
u8 key[DES3_128_KEY_SIZE];
};
struct crypt_s390_des3_192_ctx {
u8 iv[DES_BLOCK_SIZE];
u8 key[DES3_192_KEY_SIZE];
};
static int
des_setkey(void *ctx, const u8 *key, unsigned int keylen, u32 *flags)
{
struct crypt_s390_des_ctx *dctx;
int ret;
dctx = ctx;
//test if key is valid (not a weak key)
ret = crypto_des_check_key(key, keylen, flags);
if (ret == 0){
memcpy(dctx->key, key, keylen);
}
return ret;
}
static void
des_encrypt(void *ctx, u8 *dst, const u8 *src)
{
struct crypt_s390_des_ctx *dctx;
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)
{
struct crypt_s390_des_ctx *dctx;
dctx = ctx;
crypt_s390_km(KM_DEA_DECRYPT, dctx->key, dst, src, DES_BLOCK_SIZE);
}
static struct crypto_alg des_alg = {
.cra_name = "des",
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
.cra_blocksize = DES_BLOCK_SIZE,
.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 } }
};
/*
* RFC2451:
*
* For DES-EDE3, there is no known need to reject weak or
* complementation keys. Any weakness is obviated by the use of
* multiple keys.
*
* However, if the two independent 64-bit keys are equal,
* then the DES3 operation is simply the same as DES.
* Implementers MUST reject keys that exhibit this property.
*
*/
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;
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) {
ret = crypto_des_check_key(temp_key, DES_KEY_SIZE, flags);
if (ret < 0)
return ret;
}
memcpy(dctx->key, key, keylen);
return 0;
}
static void
des3_128_encrypt(void *ctx, u8 *dst, const u8 *src)
{
struct crypt_s390_des3_128_ctx *dctx;
dctx = ctx;
crypt_s390_km(KM_TDEA_128_ENCRYPT, dctx->key, dst, (void*)src,
DES3_128_BLOCK_SIZE);
}
static void
des3_128_decrypt(void *ctx, u8 *dst, const u8 *src)
{
struct crypt_s390_des3_128_ctx *dctx;
dctx = ctx;
crypt_s390_km(KM_TDEA_128_DECRYPT, dctx->key, dst, (void*)src,
DES3_128_BLOCK_SIZE);
}
static struct crypto_alg des3_128_alg = {
.cra_name = "des3_ede128",
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
.cra_blocksize = DES3_128_BLOCK_SIZE,
.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 } }
};
/*
* RFC2451:
*
* For DES-EDE3, there is no known need to reject weak or
* complementation keys. Any weakness is obviated by the use of
* multiple keys.
*
* However, if the first two or last two independent 64-bit keys are
* equal (k1 == k2 or k2 == k3), then the DES3 operation is simply the
* same as DES. Implementers MUST reject keys that exhibit this
* property.
*
*/
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;
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))) {
*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){
return ret;
}
}
memcpy(dctx->key, key, keylen);
return 0;
}
static void
des3_192_encrypt(void *ctx, u8 *dst, const u8 *src)
{
struct crypt_s390_des3_192_ctx *dctx;
dctx = ctx;
crypt_s390_km(KM_TDEA_192_ENCRYPT, dctx->key, dst, (void*)src,
DES3_192_BLOCK_SIZE);
}
static void
des3_192_decrypt(void *ctx, u8 *dst, const u8 *src)
{
struct crypt_s390_des3_192_ctx *dctx;
dctx = ctx;
crypt_s390_km(KM_TDEA_192_DECRYPT, dctx->key, dst, (void*)src,
DES3_192_BLOCK_SIZE);
}
static struct crypto_alg des3_192_alg = {
.cra_name = "des3_ede",
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
.cra_blocksize = DES3_192_BLOCK_SIZE,
.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 } }
};
static int
init(void)
{
int ret;
if (!crypt_s390_func_available(KM_DEA_ENCRYPT) ||
!crypt_s390_func_available(KM_TDEA_128_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){
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)
{
crypto_unregister_alg(&des3_192_alg);
crypto_unregister_alg(&des3_128_alg);
crypto_unregister_alg(&des_alg);
}
module_init(init);
module_exit(fini);
MODULE_ALIAS("des");
MODULE_ALIAS("des3_ede");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("DES & Triple DES EDE Cipher Algorithms");
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