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/*
* Cryptographic API.
*
* s390 implementation of the AES Cipher Algorithm.
*
* s390 Version:
* Copyright (C) 2005 IBM Deutschland GmbH, IBM Corporation
* Author(s): Jan Glauber (jang@de.ibm.com)
*
* Derived from "crypto/aes.c"
*
* 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/module.h>
#include <linux/init.h>
#include <linux/crypto.h>
#include "crypt_s390.h"
#define AES_MIN_KEY_SIZE 16
#define AES_MAX_KEY_SIZE 32
/* data block size for all key lengths */
#define AES_BLOCK_SIZE 16
int has_aes_128 = 0;
int has_aes_192 = 0;
int has_aes_256 = 0;
struct s390_aes_ctx {
u8 iv[AES_BLOCK_SIZE];
u8 key[AES_MAX_KEY_SIZE];
int key_len;
};
static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
unsigned int key_len)
{
struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
u32 *flags = &tfm->crt_flags;
switch (key_len) {
case 16:
if (!has_aes_128)
goto fail;
break;
case 24:
if (!has_aes_192)
goto fail;
break;
case 32:
if (!has_aes_256)
goto fail;
break;
default:
/* invalid key length */
goto fail;
break;
}
sctx->key_len = key_len;
memcpy(sctx->key, in_key, key_len);
return 0;
fail:
*flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
return -EINVAL;
}
static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
const struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
switch (sctx->key_len) {
case 16:
crypt_s390_km(KM_AES_128_ENCRYPT, &sctx->key, out, in,
AES_BLOCK_SIZE);
break;
case 24:
crypt_s390_km(KM_AES_192_ENCRYPT, &sctx->key, out, in,
AES_BLOCK_SIZE);
break;
case 32:
crypt_s390_km(KM_AES_256_ENCRYPT, &sctx->key, out, in,
AES_BLOCK_SIZE);
break;
}
}
static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
const struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
switch (sctx->key_len) {
case 16:
crypt_s390_km(KM_AES_128_DECRYPT, &sctx->key, out, in,
AES_BLOCK_SIZE);
break;
case 24:
crypt_s390_km(KM_AES_192_DECRYPT, &sctx->key, out, in,
AES_BLOCK_SIZE);
break;
case 32:
crypt_s390_km(KM_AES_256_DECRYPT, &sctx->key, out, in,
AES_BLOCK_SIZE);
break;
}
}
static unsigned int aes_encrypt_ecb(const struct cipher_desc *desc, u8 *out,
const u8 *in, unsigned int nbytes)
{
struct s390_aes_ctx *sctx = crypto_tfm_ctx(desc->tfm);
int ret;
/* only use complete blocks */
nbytes &= ~(AES_BLOCK_SIZE - 1);
switch (sctx->key_len) {
case 16:
ret = crypt_s390_km(KM_AES_128_ENCRYPT, &sctx->key, out, in, nbytes);
BUG_ON((ret < 0) || (ret != nbytes));
break;
case 24:
ret = crypt_s390_km(KM_AES_192_ENCRYPT, &sctx->key, out, in, nbytes);
BUG_ON((ret < 0) || (ret != nbytes));
break;
case 32:
ret = crypt_s390_km(KM_AES_256_ENCRYPT, &sctx->key, out, in, nbytes);
BUG_ON((ret < 0) || (ret != nbytes));
break;
}
return nbytes;
}
static unsigned int aes_decrypt_ecb(const struct cipher_desc *desc, u8 *out,
const u8 *in, unsigned int nbytes)
{
struct s390_aes_ctx *sctx = crypto_tfm_ctx(desc->tfm);
int ret;
/* only use complete blocks */
nbytes &= ~(AES_BLOCK_SIZE - 1);
switch (sctx->key_len) {
case 16:
ret = crypt_s390_km(KM_AES_128_DECRYPT, &sctx->key, out, in, nbytes);
BUG_ON((ret < 0) || (ret != nbytes));
break;
case 24:
ret = crypt_s390_km(KM_AES_192_DECRYPT, &sctx->key, out, in, nbytes);
BUG_ON((ret < 0) || (ret != nbytes));
break;
case 32:
ret = crypt_s390_km(KM_AES_256_DECRYPT, &sctx->key, out, in, nbytes);
BUG_ON((ret < 0) || (ret != nbytes));
break;
}
return nbytes;
}
static unsigned int aes_encrypt_cbc(const struct cipher_desc *desc, u8 *out,
const u8 *in, unsigned int nbytes)
{
struct s390_aes_ctx *sctx = crypto_tfm_ctx(desc->tfm);
int ret;
/* only use complete blocks */
nbytes &= ~(AES_BLOCK_SIZE - 1);
memcpy(&sctx->iv, desc->info, AES_BLOCK_SIZE);
switch (sctx->key_len) {
case 16:
ret = crypt_s390_kmc(KMC_AES_128_ENCRYPT, &sctx->iv, out, in, nbytes);
BUG_ON((ret < 0) || (ret != nbytes));
break;
case 24:
ret = crypt_s390_kmc(KMC_AES_192_ENCRYPT, &sctx->iv, out, in, nbytes);
BUG_ON((ret < 0) || (ret != nbytes));
break;
case 32:
ret = crypt_s390_kmc(KMC_AES_256_ENCRYPT, &sctx->iv, out, in, nbytes);
BUG_ON((ret < 0) || (ret != nbytes));
break;
}
memcpy(desc->info, &sctx->iv, AES_BLOCK_SIZE);
return nbytes;
}
static unsigned int aes_decrypt_cbc(const struct cipher_desc *desc, u8 *out,
const u8 *in, unsigned int nbytes)
{
struct s390_aes_ctx *sctx = crypto_tfm_ctx(desc->tfm);
int ret;
/* only use complete blocks */
nbytes &= ~(AES_BLOCK_SIZE - 1);
memcpy(&sctx->iv, desc->info, AES_BLOCK_SIZE);
switch (sctx->key_len) {
case 16:
ret = crypt_s390_kmc(KMC_AES_128_DECRYPT, &sctx->iv, out, in, nbytes);
BUG_ON((ret < 0) || (ret != nbytes));
break;
case 24:
ret = crypt_s390_kmc(KMC_AES_192_DECRYPT, &sctx->iv, out, in, nbytes);
BUG_ON((ret < 0) || (ret != nbytes));
break;
case 32:
ret = crypt_s390_kmc(KMC_AES_256_DECRYPT, &sctx->iv, out, in, nbytes);
BUG_ON((ret < 0) || (ret != nbytes));
break;
}
return nbytes;
}
static struct crypto_alg aes_alg = {
.cra_name = "aes",
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct s390_aes_ctx),
.cra_module = THIS_MODULE,
.cra_list = LIST_HEAD_INIT(aes_alg.cra_list),
.cra_u = {
.cipher = {
.cia_min_keysize = AES_MIN_KEY_SIZE,
.cia_max_keysize = AES_MAX_KEY_SIZE,
.cia_setkey = aes_set_key,
.cia_encrypt = aes_encrypt,
.cia_decrypt = aes_decrypt,
.cia_encrypt_ecb = aes_encrypt_ecb,
.cia_decrypt_ecb = aes_decrypt_ecb,
.cia_encrypt_cbc = aes_encrypt_cbc,
.cia_decrypt_cbc = aes_decrypt_cbc,
}
}
};
static int __init aes_init(void)
{
int ret;
if (crypt_s390_func_available(KM_AES_128_ENCRYPT))
has_aes_128 = 1;
if (crypt_s390_func_available(KM_AES_192_ENCRYPT))
has_aes_192 = 1;
if (crypt_s390_func_available(KM_AES_256_ENCRYPT))
has_aes_256 = 1;
if (!has_aes_128 && !has_aes_192 && !has_aes_256)
return -ENOSYS;
ret = crypto_register_alg(&aes_alg);
if (ret != 0)
printk(KERN_INFO "crypt_s390: aes_s390 couldn't be loaded.\n");
return ret;
}
static void __exit aes_fini(void)
{
crypto_unregister_alg(&aes_alg);
}
module_init(aes_init);
module_exit(aes_fini);
MODULE_ALIAS("aes");
MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm");
MODULE_LICENSE("GPL");
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