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linux/arch/s390/crypto/des_s390.c
Heiko Carstens 9f7819c1e5 [S390] crypto: use more descriptive function names for init/exit routines. 
Not very helpful when code dies in "init".
See also http://lkml.org/lkml/2008/3/26/557 .

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
2008-04-17 07:47:03 +02:00

636 lines
18 KiB
C
Raw Blame History

/*
* Cryptographic API.
*
* s390 implementation of the DES Cipher Algorithm.
*
* Copyright IBM Corp. 2003,2007
* Author(s): Thomas Spatzier
* Jan Glauber (jan.glauber@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 <crypto/algapi.h>
#include <linux/init.h>
#include <linux/module.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(struct crypto_tfm *tfm, const u8 *key,
unsigned int keylen)
{
struct crypt_s390_des_ctx *dctx = crypto_tfm_ctx(tfm);
u32 *flags = &tfm->crt_flags;
int ret;
/* 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(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
struct crypt_s390_des_ctx *dctx = crypto_tfm_ctx(tfm);
crypt_s390_km(KM_DEA_ENCRYPT, dctx->key, out, in, DES_BLOCK_SIZE);
}
static void des_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
struct crypt_s390_des_ctx *dctx = crypto_tfm_ctx(tfm);
crypt_s390_km(KM_DEA_DECRYPT, dctx->key, out, in, DES_BLOCK_SIZE);
}
static struct crypto_alg des_alg = {
.cra_name = "des",
.cra_driver_name = "des-s390",
.cra_priority = CRYPT_S390_PRIORITY,
.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,
}
}
};
static int ecb_desall_crypt(struct blkcipher_desc *desc, long func,
void *param, struct blkcipher_walk *walk)
{
int ret = blkcipher_walk_virt(desc, walk);
unsigned int nbytes;
while ((nbytes = walk->nbytes)) {
/* only use complete blocks */
unsigned int n = nbytes & ~(DES_BLOCK_SIZE - 1);
u8 *out = walk->dst.virt.addr;
u8 *in = walk->src.virt.addr;
ret = crypt_s390_km(func, param, out, in, n);
BUG_ON((ret < 0) || (ret != n));
nbytes &= DES_BLOCK_SIZE - 1;
ret = blkcipher_walk_done(desc, walk, nbytes);
}
return ret;
}
static int cbc_desall_crypt(struct blkcipher_desc *desc, long func,
void *param, struct blkcipher_walk *walk)
{
int ret = blkcipher_walk_virt(desc, walk);
unsigned int nbytes = walk->nbytes;
if (!nbytes)
goto out;
memcpy(param, walk->iv, DES_BLOCK_SIZE);
do {
/* only use complete blocks */
unsigned int n = nbytes & ~(DES_BLOCK_SIZE - 1);
u8 *out = walk->dst.virt.addr;
u8 *in = walk->src.virt.addr;
ret = crypt_s390_kmc(func, param, out, in, n);
BUG_ON((ret < 0) || (ret != n));
nbytes &= DES_BLOCK_SIZE - 1;
ret = blkcipher_walk_done(desc, walk, nbytes);
} while ((nbytes = walk->nbytes));
memcpy(walk->iv, param, DES_BLOCK_SIZE);
out:
return ret;
}
static int ecb_des_encrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
struct crypt_s390_des_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return ecb_desall_crypt(desc, KM_DEA_ENCRYPT, sctx->key, &walk);
}
static int ecb_des_decrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
struct crypt_s390_des_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return ecb_desall_crypt(desc, KM_DEA_DECRYPT, sctx->key, &walk);
}
static struct crypto_alg ecb_des_alg = {
.cra_name = "ecb(des)",
.cra_driver_name = "ecb-des-s390",
.cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
.cra_blocksize = DES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct crypt_s390_des_ctx),
.cra_type = &crypto_blkcipher_type,
.cra_module = THIS_MODULE,
.cra_list = LIST_HEAD_INIT(ecb_des_alg.cra_list),
.cra_u = {
.blkcipher = {
.min_keysize = DES_KEY_SIZE,
.max_keysize = DES_KEY_SIZE,
.setkey = des_setkey,
.encrypt = ecb_des_encrypt,
.decrypt = ecb_des_decrypt,
}
}
};
static int cbc_des_encrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
struct crypt_s390_des_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return cbc_desall_crypt(desc, KMC_DEA_ENCRYPT, sctx->iv, &walk);
}
static int cbc_des_decrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
struct crypt_s390_des_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return cbc_desall_crypt(desc, KMC_DEA_DECRYPT, sctx->iv, &walk);
}
static struct crypto_alg cbc_des_alg = {
.cra_name = "cbc(des)",
.cra_driver_name = "cbc-des-s390",
.cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
.cra_blocksize = DES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct crypt_s390_des_ctx),
.cra_type = &crypto_blkcipher_type,
.cra_module = THIS_MODULE,
.cra_list = LIST_HEAD_INIT(cbc_des_alg.cra_list),
.cra_u = {
.blkcipher = {
.min_keysize = DES_KEY_SIZE,
.max_keysize = DES_KEY_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = des_setkey,
.encrypt = cbc_des_encrypt,
.decrypt = cbc_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(struct crypto_tfm *tfm, const u8 *key,
unsigned int keylen)
{
int i, ret;
struct crypt_s390_des3_128_ctx *dctx = crypto_tfm_ctx(tfm);
const u8 *temp_key = key;
u32 *flags = &tfm->crt_flags;
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(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
struct crypt_s390_des3_128_ctx *dctx = crypto_tfm_ctx(tfm);
crypt_s390_km(KM_TDEA_128_ENCRYPT, dctx->key, dst, (void*)src,
DES3_128_BLOCK_SIZE);
}
static void des3_128_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
struct crypt_s390_des3_128_ctx *dctx = crypto_tfm_ctx(tfm);
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_driver_name = "des3_ede128-s390",
.cra_priority = CRYPT_S390_PRIORITY,
.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,
}
}
};
static int ecb_des3_128_encrypt(struct blkcipher_desc *desc,
struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
struct crypt_s390_des3_128_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return ecb_desall_crypt(desc, KM_TDEA_128_ENCRYPT, sctx->key, &walk);
}
static int ecb_des3_128_decrypt(struct blkcipher_desc *desc,
struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
struct crypt_s390_des3_128_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return ecb_desall_crypt(desc, KM_TDEA_128_DECRYPT, sctx->key, &walk);
}
static struct crypto_alg ecb_des3_128_alg = {
.cra_name = "ecb(des3_ede128)",
.cra_driver_name = "ecb-des3_ede128-s390",
.cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
.cra_blocksize = DES3_128_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct crypt_s390_des3_128_ctx),
.cra_type = &crypto_blkcipher_type,
.cra_module = THIS_MODULE,
.cra_list = LIST_HEAD_INIT(
ecb_des3_128_alg.cra_list),
.cra_u = {
.blkcipher = {
.min_keysize = DES3_128_KEY_SIZE,
.max_keysize = DES3_128_KEY_SIZE,
.setkey = des3_128_setkey,
.encrypt = ecb_des3_128_encrypt,
.decrypt = ecb_des3_128_decrypt,
}
}
};
static int cbc_des3_128_encrypt(struct blkcipher_desc *desc,
struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
struct crypt_s390_des3_128_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return cbc_desall_crypt(desc, KMC_TDEA_128_ENCRYPT, sctx->iv, &walk);
}
static int cbc_des3_128_decrypt(struct blkcipher_desc *desc,
struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
struct crypt_s390_des3_128_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return cbc_desall_crypt(desc, KMC_TDEA_128_DECRYPT, sctx->iv, &walk);
}
static struct crypto_alg cbc_des3_128_alg = {
.cra_name = "cbc(des3_ede128)",
.cra_driver_name = "cbc-des3_ede128-s390",
.cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
.cra_blocksize = DES3_128_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct crypt_s390_des3_128_ctx),
.cra_type = &crypto_blkcipher_type,
.cra_module = THIS_MODULE,
.cra_list = LIST_HEAD_INIT(
cbc_des3_128_alg.cra_list),
.cra_u = {
.blkcipher = {
.min_keysize = DES3_128_KEY_SIZE,
.max_keysize = DES3_128_KEY_SIZE,
.ivsize = DES3_128_BLOCK_SIZE,
.setkey = des3_128_setkey,
.encrypt = cbc_des3_128_encrypt,
.decrypt = cbc_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(struct crypto_tfm *tfm, const u8 *key,
unsigned int keylen)
{
int i, ret;
struct crypt_s390_des3_192_ctx *dctx = crypto_tfm_ctx(tfm);
const u8 *temp_key = key;
u32 *flags = &tfm->crt_flags;
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(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
struct crypt_s390_des3_192_ctx *dctx = crypto_tfm_ctx(tfm);
crypt_s390_km(KM_TDEA_192_ENCRYPT, dctx->key, dst, (void*)src,
DES3_192_BLOCK_SIZE);
}
static void des3_192_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
struct crypt_s390_des3_192_ctx *dctx = crypto_tfm_ctx(tfm);
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_driver_name = "des3_ede-s390",
.cra_priority = CRYPT_S390_PRIORITY,
.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 ecb_des3_192_encrypt(struct blkcipher_desc *desc,
struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
struct crypt_s390_des3_192_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return ecb_desall_crypt(desc, KM_TDEA_192_ENCRYPT, sctx->key, &walk);
}
static int ecb_des3_192_decrypt(struct blkcipher_desc *desc,
struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
struct crypt_s390_des3_192_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return ecb_desall_crypt(desc, KM_TDEA_192_DECRYPT, sctx->key, &walk);
}
static struct crypto_alg ecb_des3_192_alg = {
.cra_name = "ecb(des3_ede)",
.cra_driver_name = "ecb-des3_ede-s390",
.cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
.cra_blocksize = DES3_192_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct crypt_s390_des3_192_ctx),
.cra_type = &crypto_blkcipher_type,
.cra_module = THIS_MODULE,
.cra_list = LIST_HEAD_INIT(
ecb_des3_192_alg.cra_list),
.cra_u = {
.blkcipher = {
.min_keysize = DES3_192_KEY_SIZE,
.max_keysize = DES3_192_KEY_SIZE,
.setkey = des3_192_setkey,
.encrypt = ecb_des3_192_encrypt,
.decrypt = ecb_des3_192_decrypt,
}
}
};
static int cbc_des3_192_encrypt(struct blkcipher_desc *desc,
struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
struct crypt_s390_des3_192_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return cbc_desall_crypt(desc, KMC_TDEA_192_ENCRYPT, sctx->iv, &walk);
}
static int cbc_des3_192_decrypt(struct blkcipher_desc *desc,
struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
struct crypt_s390_des3_192_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return cbc_desall_crypt(desc, KMC_TDEA_192_DECRYPT, sctx->iv, &walk);
}
static struct crypto_alg cbc_des3_192_alg = {
.cra_name = "cbc(des3_ede)",
.cra_driver_name = "cbc-des3_ede-s390",
.cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
.cra_blocksize = DES3_192_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct crypt_s390_des3_192_ctx),
.cra_type = &crypto_blkcipher_type,
.cra_module = THIS_MODULE,
.cra_list = LIST_HEAD_INIT(
cbc_des3_192_alg.cra_list),
.cra_u = {
.blkcipher = {
.min_keysize = DES3_192_KEY_SIZE,
.max_keysize = DES3_192_KEY_SIZE,
.ivsize = DES3_192_BLOCK_SIZE,
.setkey = des3_192_setkey,
.encrypt = cbc_des3_192_encrypt,
.decrypt = cbc_des3_192_decrypt,
}
}
};
static int des_s390_init(void)
{
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))
return -EOPNOTSUPP;
ret = crypto_register_alg(&des_alg);
if (ret)
goto des_err;
ret = crypto_register_alg(&ecb_des_alg);
if (ret)
goto ecb_des_err;
ret = crypto_register_alg(&cbc_des_alg);
if (ret)
goto cbc_des_err;
ret = crypto_register_alg(&des3_128_alg);
if (ret)
goto des3_128_err;
ret = crypto_register_alg(&ecb_des3_128_alg);
if (ret)
goto ecb_des3_128_err;
ret = crypto_register_alg(&cbc_des3_128_alg);
if (ret)
goto cbc_des3_128_err;
ret = crypto_register_alg(&des3_192_alg);
if (ret)
goto des3_192_err;
ret = crypto_register_alg(&ecb_des3_192_alg);
if (ret)
goto ecb_des3_192_err;
ret = crypto_register_alg(&cbc_des3_192_alg);
if (ret)
goto cbc_des3_192_err;
out:
return ret;
cbc_des3_192_err:
crypto_unregister_alg(&ecb_des3_192_alg);
ecb_des3_192_err:
crypto_unregister_alg(&des3_192_alg);
des3_192_err:
crypto_unregister_alg(&cbc_des3_128_alg);
cbc_des3_128_err:
crypto_unregister_alg(&ecb_des3_128_alg);
ecb_des3_128_err:
crypto_unregister_alg(&des3_128_alg);
des3_128_err:
crypto_unregister_alg(&cbc_des_alg);
cbc_des_err:
crypto_unregister_alg(&ecb_des_alg);
ecb_des_err:
crypto_unregister_alg(&des_alg);
des_err:
goto out;
}
static void __exit des_s390_fini(void)
{
crypto_unregister_alg(&cbc_des3_192_alg);
crypto_unregister_alg(&ecb_des3_192_alg);
crypto_unregister_alg(&des3_192_alg);
crypto_unregister_alg(&cbc_des3_128_alg);
crypto_unregister_alg(&ecb_des3_128_alg);
crypto_unregister_alg(&des3_128_alg);
crypto_unregister_alg(&cbc_des_alg);
crypto_unregister_alg(&ecb_des_alg);
crypto_unregister_alg(&des_alg);
}
module_init(des_s390_init);
module_exit(des_s390_fini);
MODULE_ALIAS("des");
MODULE_ALIAS("des3_ede");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("DES & Triple DES EDE Cipher Algorithms");
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