386 lines
9.1 KiB
C
386 lines
9.1 KiB
C
/*
|
|
* Cryptographic API.
|
|
*
|
|
* s390 implementation of the AES Cipher Algorithm.
|
|
*
|
|
* s390 Version:
|
|
* Copyright IBM Corp. 2005,2007
|
|
* 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 <crypto/algapi.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.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
|
|
|
|
#define AES_KEYLEN_128 1
|
|
#define AES_KEYLEN_192 2
|
|
#define AES_KEYLEN_256 4
|
|
|
|
static char keylen_flag = 0;
|
|
|
|
struct s390_aes_ctx {
|
|
u8 iv[AES_BLOCK_SIZE];
|
|
u8 key[AES_MAX_KEY_SIZE];
|
|
long enc;
|
|
long dec;
|
|
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 (!(keylen_flag & AES_KEYLEN_128))
|
|
goto fail;
|
|
break;
|
|
case 24:
|
|
if (!(keylen_flag & AES_KEYLEN_192))
|
|
goto fail;
|
|
|
|
break;
|
|
case 32:
|
|
if (!(keylen_flag & AES_KEYLEN_256))
|
|
goto fail;
|
|
break;
|
|
default:
|
|
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 struct crypto_alg aes_alg = {
|
|
.cra_name = "aes",
|
|
.cra_driver_name = "aes-s390",
|
|
.cra_priority = CRYPT_S390_PRIORITY,
|
|
.cra_flags = CRYPTO_ALG_TYPE_CIPHER |
|
|
CRYPTO_ALG_NEED_FALLBACK,
|
|
.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,
|
|
}
|
|
}
|
|
};
|
|
|
|
static int ecb_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
|
|
unsigned int key_len)
|
|
{
|
|
struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
|
|
|
|
switch (key_len) {
|
|
case 16:
|
|
sctx->enc = KM_AES_128_ENCRYPT;
|
|
sctx->dec = KM_AES_128_DECRYPT;
|
|
break;
|
|
case 24:
|
|
sctx->enc = KM_AES_192_ENCRYPT;
|
|
sctx->dec = KM_AES_192_DECRYPT;
|
|
break;
|
|
case 32:
|
|
sctx->enc = KM_AES_256_ENCRYPT;
|
|
sctx->dec = KM_AES_256_DECRYPT;
|
|
break;
|
|
}
|
|
|
|
return aes_set_key(tfm, in_key, key_len);
|
|
}
|
|
|
|
static int ecb_aes_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 & ~(AES_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 &= AES_BLOCK_SIZE - 1;
|
|
ret = blkcipher_walk_done(desc, walk, nbytes);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ecb_aes_encrypt(struct blkcipher_desc *desc,
|
|
struct scatterlist *dst, struct scatterlist *src,
|
|
unsigned int nbytes)
|
|
{
|
|
struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
|
|
struct blkcipher_walk walk;
|
|
|
|
blkcipher_walk_init(&walk, dst, src, nbytes);
|
|
return ecb_aes_crypt(desc, sctx->enc, sctx->key, &walk);
|
|
}
|
|
|
|
static int ecb_aes_decrypt(struct blkcipher_desc *desc,
|
|
struct scatterlist *dst, struct scatterlist *src,
|
|
unsigned int nbytes)
|
|
{
|
|
struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
|
|
struct blkcipher_walk walk;
|
|
|
|
blkcipher_walk_init(&walk, dst, src, nbytes);
|
|
return ecb_aes_crypt(desc, sctx->dec, sctx->key, &walk);
|
|
}
|
|
|
|
static struct crypto_alg ecb_aes_alg = {
|
|
.cra_name = "ecb(aes)",
|
|
.cra_driver_name = "ecb-aes-s390",
|
|
.cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
|
|
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
|
|
CRYPTO_ALG_NEED_FALLBACK,
|
|
.cra_blocksize = AES_BLOCK_SIZE,
|
|
.cra_ctxsize = sizeof(struct s390_aes_ctx),
|
|
.cra_type = &crypto_blkcipher_type,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_list = LIST_HEAD_INIT(ecb_aes_alg.cra_list),
|
|
.cra_u = {
|
|
.blkcipher = {
|
|
.min_keysize = AES_MIN_KEY_SIZE,
|
|
.max_keysize = AES_MAX_KEY_SIZE,
|
|
.setkey = ecb_aes_set_key,
|
|
.encrypt = ecb_aes_encrypt,
|
|
.decrypt = ecb_aes_decrypt,
|
|
}
|
|
}
|
|
};
|
|
|
|
static int cbc_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
|
|
unsigned int key_len)
|
|
{
|
|
struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
|
|
|
|
switch (key_len) {
|
|
case 16:
|
|
sctx->enc = KMC_AES_128_ENCRYPT;
|
|
sctx->dec = KMC_AES_128_DECRYPT;
|
|
break;
|
|
case 24:
|
|
sctx->enc = KMC_AES_192_ENCRYPT;
|
|
sctx->dec = KMC_AES_192_DECRYPT;
|
|
break;
|
|
case 32:
|
|
sctx->enc = KMC_AES_256_ENCRYPT;
|
|
sctx->dec = KMC_AES_256_DECRYPT;
|
|
break;
|
|
}
|
|
|
|
return aes_set_key(tfm, in_key, key_len);
|
|
}
|
|
|
|
static int cbc_aes_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, AES_BLOCK_SIZE);
|
|
do {
|
|
/* only use complete blocks */
|
|
unsigned int n = nbytes & ~(AES_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 &= AES_BLOCK_SIZE - 1;
|
|
ret = blkcipher_walk_done(desc, walk, nbytes);
|
|
} while ((nbytes = walk->nbytes));
|
|
memcpy(walk->iv, param, AES_BLOCK_SIZE);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int cbc_aes_encrypt(struct blkcipher_desc *desc,
|
|
struct scatterlist *dst, struct scatterlist *src,
|
|
unsigned int nbytes)
|
|
{
|
|
struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
|
|
struct blkcipher_walk walk;
|
|
|
|
blkcipher_walk_init(&walk, dst, src, nbytes);
|
|
return cbc_aes_crypt(desc, sctx->enc, sctx->iv, &walk);
|
|
}
|
|
|
|
static int cbc_aes_decrypt(struct blkcipher_desc *desc,
|
|
struct scatterlist *dst, struct scatterlist *src,
|
|
unsigned int nbytes)
|
|
{
|
|
struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
|
|
struct blkcipher_walk walk;
|
|
|
|
blkcipher_walk_init(&walk, dst, src, nbytes);
|
|
return cbc_aes_crypt(desc, sctx->dec, sctx->iv, &walk);
|
|
}
|
|
|
|
static struct crypto_alg cbc_aes_alg = {
|
|
.cra_name = "cbc(aes)",
|
|
.cra_driver_name = "cbc-aes-s390",
|
|
.cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
|
|
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
|
|
CRYPTO_ALG_NEED_FALLBACK,
|
|
.cra_blocksize = AES_BLOCK_SIZE,
|
|
.cra_ctxsize = sizeof(struct s390_aes_ctx),
|
|
.cra_type = &crypto_blkcipher_type,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_list = LIST_HEAD_INIT(cbc_aes_alg.cra_list),
|
|
.cra_u = {
|
|
.blkcipher = {
|
|
.min_keysize = AES_MIN_KEY_SIZE,
|
|
.max_keysize = AES_MAX_KEY_SIZE,
|
|
.ivsize = AES_BLOCK_SIZE,
|
|
.setkey = cbc_aes_set_key,
|
|
.encrypt = cbc_aes_encrypt,
|
|
.decrypt = cbc_aes_decrypt,
|
|
}
|
|
}
|
|
};
|
|
|
|
static int __init aes_init(void)
|
|
{
|
|
int ret;
|
|
|
|
if (crypt_s390_func_available(KM_AES_128_ENCRYPT))
|
|
keylen_flag |= AES_KEYLEN_128;
|
|
if (crypt_s390_func_available(KM_AES_192_ENCRYPT))
|
|
keylen_flag |= AES_KEYLEN_192;
|
|
if (crypt_s390_func_available(KM_AES_256_ENCRYPT))
|
|
keylen_flag |= AES_KEYLEN_256;
|
|
|
|
if (!keylen_flag)
|
|
return -EOPNOTSUPP;
|
|
|
|
/* z9 109 and z9 BC/EC only support 128 bit key length */
|
|
if (keylen_flag == AES_KEYLEN_128) {
|
|
aes_alg.cra_u.cipher.cia_max_keysize = AES_MIN_KEY_SIZE;
|
|
ecb_aes_alg.cra_u.blkcipher.max_keysize = AES_MIN_KEY_SIZE;
|
|
cbc_aes_alg.cra_u.blkcipher.max_keysize = AES_MIN_KEY_SIZE;
|
|
printk(KERN_INFO
|
|
"aes_s390: hardware acceleration only available for"
|
|
"128 bit keys\n");
|
|
}
|
|
|
|
ret = crypto_register_alg(&aes_alg);
|
|
if (ret)
|
|
goto aes_err;
|
|
|
|
ret = crypto_register_alg(&ecb_aes_alg);
|
|
if (ret)
|
|
goto ecb_aes_err;
|
|
|
|
ret = crypto_register_alg(&cbc_aes_alg);
|
|
if (ret)
|
|
goto cbc_aes_err;
|
|
|
|
out:
|
|
return ret;
|
|
|
|
cbc_aes_err:
|
|
crypto_unregister_alg(&ecb_aes_alg);
|
|
ecb_aes_err:
|
|
crypto_unregister_alg(&aes_alg);
|
|
aes_err:
|
|
goto out;
|
|
}
|
|
|
|
static void __exit aes_fini(void)
|
|
{
|
|
crypto_unregister_alg(&cbc_aes_alg);
|
|
crypto_unregister_alg(&ecb_aes_alg);
|
|
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");
|
|
|