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linux/arch/s390/crypto/des_s390.c
Jan Glauber b8dc6038ff [PATCH] s390: des crypto code speedup 
Provide ECB and CBC encrypt / decrypt functions to crypto API to speed up our
hardware accelerated DES implementation.  This new functions allow the crypto
API to call ECB / CBC directly with large blocks in difference to the old
functions that were calles with algorithm block size (8 bytes for DES).

This is up to factor 10 faster than our old hardware implementation :)

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>
2006-01-14 18:27:08 -08:00

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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/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 = ctx;
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(void *ctx, u8 *out, const u8 *in)
{
struct crypt_s390_des_ctx *dctx = ctx;
crypt_s390_km(KM_DEA_ENCRYPT, dctx->key, out, in, DES_BLOCK_SIZE);
}
static void des_decrypt(void *ctx, u8 *out, const u8 *in)
{
struct crypt_s390_des_ctx *dctx = ctx;
crypt_s390_km(KM_DEA_DECRYPT, dctx->key, out, in, DES_BLOCK_SIZE);
}
static unsigned int des_encrypt_ecb(const struct cipher_desc *desc, u8 *out,
const u8 *in, unsigned int nbytes)
{
struct crypt_s390_des_ctx *sctx = crypto_tfm_ctx(desc->tfm);
int ret;
/* only use complete blocks */
nbytes &= ~(DES_BLOCK_SIZE - 1);
ret = crypt_s390_km(KM_DEA_ENCRYPT, sctx->key, out, in, nbytes);
BUG_ON((ret < 0) || (ret != nbytes));
return nbytes;
}
static unsigned int des_decrypt_ecb(const struct cipher_desc *desc, u8 *out,
const u8 *in, unsigned int nbytes)
{
struct crypt_s390_des_ctx *sctx = crypto_tfm_ctx(desc->tfm);
int ret;
/* only use complete blocks */
nbytes &= ~(DES_BLOCK_SIZE - 1);
ret = crypt_s390_km(KM_DEA_DECRYPT, sctx->key, out, in, nbytes);
BUG_ON((ret < 0) || (ret != nbytes));
return nbytes;
}
static unsigned int des_encrypt_cbc(const struct cipher_desc *desc, u8 *out,
const u8 *in, unsigned int nbytes)
{
struct crypt_s390_des_ctx *sctx = crypto_tfm_ctx(desc->tfm);
int ret;
/* only use complete blocks */
nbytes &= ~(DES_BLOCK_SIZE - 1);
memcpy(sctx->iv, desc->info, DES_BLOCK_SIZE);
ret = crypt_s390_kmc(KMC_DEA_ENCRYPT, &sctx->iv, out, in, nbytes);
BUG_ON((ret < 0) || (ret != nbytes));
memcpy(desc->info, sctx->iv, DES_BLOCK_SIZE);
return nbytes;
}
static unsigned int des_decrypt_cbc(const struct cipher_desc *desc, u8 *out,
const u8 *in, unsigned int nbytes)
{
struct crypt_s390_des_ctx *sctx = crypto_tfm_ctx(desc->tfm);
int ret;
/* only use complete blocks */
nbytes &= ~(DES_BLOCK_SIZE - 1);
memcpy(&sctx->iv, desc->info, DES_BLOCK_SIZE);
ret = crypt_s390_kmc(KMC_DEA_DECRYPT, &sctx->iv, out, in, nbytes);
BUG_ON((ret < 0) || (ret != nbytes));
return nbytes;
}
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,
.cia_encrypt_ecb = des_encrypt_ecb,
.cia_decrypt_ecb = des_decrypt_ecb,
.cia_encrypt_cbc = des_encrypt_cbc,
.cia_decrypt_cbc = des_decrypt_cbc,
}
}
};
/*
* 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 = ctx;
const u8* temp_key = key;
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 = 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 = ctx;
crypt_s390_km(KM_TDEA_128_DECRYPT, dctx->key, dst, (void*)src,
DES3_128_BLOCK_SIZE);
}
static unsigned int des3_128_encrypt_ecb(const struct cipher_desc *desc,
u8 *out, const u8 *in,
unsigned int nbytes)
{
struct crypt_s390_des3_128_ctx *sctx = crypto_tfm_ctx(desc->tfm);
int ret;
/* only use complete blocks */
nbytes &= ~(DES3_128_BLOCK_SIZE - 1);
ret = crypt_s390_km(KM_TDEA_128_ENCRYPT, sctx->key, out, in, nbytes);
BUG_ON((ret < 0) || (ret != nbytes));
return nbytes;
}
static unsigned int des3_128_decrypt_ecb(const struct cipher_desc *desc,
u8 *out, const u8 *in,
unsigned int nbytes)
{
struct crypt_s390_des3_128_ctx *sctx = crypto_tfm_ctx(desc->tfm);
int ret;
/* only use complete blocks */
nbytes &= ~(DES3_128_BLOCK_SIZE - 1);
ret = crypt_s390_km(KM_TDEA_128_DECRYPT, sctx->key, out, in, nbytes);
BUG_ON((ret < 0) || (ret != nbytes));
return nbytes;
}
static unsigned int des3_128_encrypt_cbc(const struct cipher_desc *desc,
u8 *out, const u8 *in,
unsigned int nbytes)
{
struct crypt_s390_des3_128_ctx *sctx = crypto_tfm_ctx(desc->tfm);
int ret;
/* only use complete blocks */
nbytes &= ~(DES3_128_BLOCK_SIZE - 1);
memcpy(sctx->iv, desc->info, DES3_128_BLOCK_SIZE);
ret = crypt_s390_kmc(KMC_TDEA_128_ENCRYPT, &sctx->iv, out, in, nbytes);
BUG_ON((ret < 0) || (ret != nbytes));
memcpy(desc->info, sctx->iv, DES3_128_BLOCK_SIZE);
return nbytes;
}
static unsigned int des3_128_decrypt_cbc(const struct cipher_desc *desc,
u8 *out, const u8 *in,
unsigned int nbytes)
{
struct crypt_s390_des3_128_ctx *sctx = crypto_tfm_ctx(desc->tfm);
int ret;
/* only use complete blocks */
nbytes &= ~(DES3_128_BLOCK_SIZE - 1);
memcpy(&sctx->iv, desc->info, DES3_128_BLOCK_SIZE);
ret = crypt_s390_kmc(KMC_TDEA_128_DECRYPT, &sctx->iv, out, in, nbytes);
BUG_ON((ret < 0) || (ret != nbytes));
return nbytes;
}
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,
.cia_encrypt_ecb = des3_128_encrypt_ecb,
.cia_decrypt_ecb = des3_128_decrypt_ecb,
.cia_encrypt_cbc = des3_128_encrypt_cbc,
.cia_decrypt_cbc = des3_128_decrypt_cbc,
}
}
};
/*
* 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 = ctx;
const u8* 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 = 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 = ctx;
crypt_s390_km(KM_TDEA_192_DECRYPT, dctx->key, dst, (void*)src,
DES3_192_BLOCK_SIZE);
}
static unsigned int des3_192_encrypt_ecb(const struct cipher_desc *desc,
u8 *out, const u8 *in,
unsigned int nbytes)
{
struct crypt_s390_des3_192_ctx *sctx = crypto_tfm_ctx(desc->tfm);
int ret;
/* only use complete blocks */
nbytes &= ~(DES3_192_BLOCK_SIZE - 1);
ret = crypt_s390_km(KM_TDEA_192_ENCRYPT, sctx->key, out, in, nbytes);
BUG_ON((ret < 0) || (ret != nbytes));
return nbytes;
}
static unsigned int des3_192_decrypt_ecb(const struct cipher_desc *desc,
u8 *out, const u8 *in,
unsigned int nbytes)
{
struct crypt_s390_des3_192_ctx *sctx = crypto_tfm_ctx(desc->tfm);
int ret;
/* only use complete blocks */
nbytes &= ~(DES3_192_BLOCK_SIZE - 1);
ret = crypt_s390_km(KM_TDEA_192_DECRYPT, sctx->key, out, in, nbytes);
BUG_ON((ret < 0) || (ret != nbytes));
return nbytes;
}
static unsigned int des3_192_encrypt_cbc(const struct cipher_desc *desc,
u8 *out, const u8 *in,
unsigned int nbytes)
{
struct crypt_s390_des3_192_ctx *sctx = crypto_tfm_ctx(desc->tfm);
int ret;
/* only use complete blocks */
nbytes &= ~(DES3_192_BLOCK_SIZE - 1);
memcpy(sctx->iv, desc->info, DES3_192_BLOCK_SIZE);
ret = crypt_s390_kmc(KMC_TDEA_192_ENCRYPT, &sctx->iv, out, in, nbytes);
BUG_ON((ret < 0) || (ret != nbytes));
memcpy(desc->info, sctx->iv, DES3_192_BLOCK_SIZE);
return nbytes;
}
static unsigned int des3_192_decrypt_cbc(const struct cipher_desc *desc,
u8 *out, const u8 *in,
unsigned int nbytes)
{
struct crypt_s390_des3_192_ctx *sctx = crypto_tfm_ctx(desc->tfm);
int ret;
/* only use complete blocks */
nbytes &= ~(DES3_192_BLOCK_SIZE - 1);
memcpy(&sctx->iv, desc->info, DES3_192_BLOCK_SIZE);
ret = crypt_s390_kmc(KMC_TDEA_192_DECRYPT, &sctx->iv, out, in, nbytes);
BUG_ON((ret < 0) || (ret != nbytes));
return nbytes;
}
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,
.cia_encrypt_ecb = des3_192_encrypt_ecb,
.cia_decrypt_ecb = des3_192_decrypt_ecb,
.cia_encrypt_cbc = des3_192_encrypt_cbc,
.cia_decrypt_cbc = des3_192_decrypt_cbc,
}
}
};
static int 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 -ENOSYS;
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;
}
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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