forked from Minki/linux
powerpc/crypto: AES-GCM mode routines for nx encryption
These routines add support for AES in GCM mode on the Power7+ CPU's in-Nest accelerator driver. Signed-off-by: Kent Yoder <key@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Kent Yoder
Benjamin Herrenschmidt
parent
cc6250896a
commit
f2a15f1d5d
353
drivers/crypto/nx/nx-aes-gcm.c
Normal file
353
drivers/crypto/nx/nx-aes-gcm.c
Normal file
@ -0,0 +1,353 @@
|
||||
/**
|
||||
* AES GCM routines supporting the Power 7+ Nest Accelerators driver
|
||||
*
|
||||
* Copyright (C) 2012 International Business Machines Inc.
|
||||
*
|
||||
* 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; version 2 only.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
||||
*
|
||||
* Author: Kent Yoder <yoder1@us.ibm.com>
|
||||
*/
|
||||
|
||||
#include <crypto/internal/aead.h>
|
||||
#include <crypto/aes.h>
|
||||
#include <crypto/algapi.h>
|
||||
#include <crypto/scatterwalk.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/types.h>
|
||||
#include <linux/crypto.h>
|
||||
#include <asm/vio.h>
|
||||
|
||||
#include "nx_csbcpb.h"
|
||||
#include "nx.h"
|
||||
|
||||
|
||||
static int gcm_aes_nx_set_key(struct crypto_aead *tfm,
|
||||
const u8 *in_key,
|
||||
unsigned int key_len)
|
||||
{
|
||||
struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&tfm->base);
|
||||
struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
|
||||
struct nx_csbcpb *csbcpb_aead = nx_ctx->csbcpb_aead;
|
||||
|
||||
nx_ctx_init(nx_ctx, HCOP_FC_AES);
|
||||
|
||||
switch (key_len) {
|
||||
case AES_KEYSIZE_128:
|
||||
NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_128);
|
||||
NX_CPB_SET_KEY_SIZE(csbcpb_aead, NX_KS_AES_128);
|
||||
nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_128];
|
||||
break;
|
||||
case AES_KEYSIZE_192:
|
||||
NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_192);
|
||||
NX_CPB_SET_KEY_SIZE(csbcpb_aead, NX_KS_AES_192);
|
||||
nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_192];
|
||||
break;
|
||||
case AES_KEYSIZE_256:
|
||||
NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_256);
|
||||
NX_CPB_SET_KEY_SIZE(csbcpb_aead, NX_KS_AES_256);
|
||||
nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_256];
|
||||
break;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
csbcpb->cpb.hdr.mode = NX_MODE_AES_GCM;
|
||||
memcpy(csbcpb->cpb.aes_gcm.key, in_key, key_len);
|
||||
|
||||
csbcpb_aead->cpb.hdr.mode = NX_MODE_AES_GCA;
|
||||
memcpy(csbcpb_aead->cpb.aes_gca.key, in_key, key_len);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int gcm4106_aes_nx_set_key(struct crypto_aead *tfm,
|
||||
const u8 *in_key,
|
||||
unsigned int key_len)
|
||||
{
|
||||
struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&tfm->base);
|
||||
char *nonce = nx_ctx->priv.gcm.nonce;
|
||||
int rc;
|
||||
|
||||
if (key_len < 4)
|
||||
return -EINVAL;
|
||||
|
||||
key_len -= 4;
|
||||
|
||||
rc = gcm_aes_nx_set_key(tfm, in_key, key_len);
|
||||
if (rc)
|
||||
goto out;
|
||||
|
||||
memcpy(nonce, in_key + key_len, 4);
|
||||
out:
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int gcm_aes_nx_setauthsize(struct crypto_aead *tfm,
|
||||
unsigned int authsize)
|
||||
{
|
||||
if (authsize > crypto_aead_alg(tfm)->maxauthsize)
|
||||
return -EINVAL;
|
||||
|
||||
crypto_aead_crt(tfm)->authsize = authsize;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int gcm4106_aes_nx_setauthsize(struct crypto_aead *tfm,
|
||||
unsigned int authsize)
|
||||
{
|
||||
switch (authsize) {
|
||||
case 8:
|
||||
case 12:
|
||||
case 16:
|
||||
break;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
crypto_aead_crt(tfm)->authsize = authsize;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int nx_gca(struct nx_crypto_ctx *nx_ctx,
|
||||
struct aead_request *req,
|
||||
u8 *out)
|
||||
{
|
||||
struct nx_csbcpb *csbcpb_aead = nx_ctx->csbcpb_aead;
|
||||
int rc = -EINVAL;
|
||||
struct scatter_walk walk;
|
||||
struct nx_sg *nx_sg = nx_ctx->in_sg;
|
||||
|
||||
if (req->assoclen > nx_ctx->ap->databytelen)
|
||||
goto out;
|
||||
|
||||
if (req->assoclen <= AES_BLOCK_SIZE) {
|
||||
scatterwalk_start(&walk, req->assoc);
|
||||
scatterwalk_copychunks(out, &walk, req->assoclen,
|
||||
SCATTERWALK_FROM_SG);
|
||||
scatterwalk_done(&walk, SCATTERWALK_FROM_SG, 0);
|
||||
|
||||
rc = 0;
|
||||
goto out;
|
||||
}
|
||||
|
||||
nx_sg = nx_walk_and_build(nx_sg, nx_ctx->ap->sglen, req->assoc, 0,
|
||||
req->assoclen);
|
||||
nx_ctx->op_aead.inlen = (nx_ctx->in_sg - nx_sg) * sizeof(struct nx_sg);
|
||||
|
||||
rc = nx_hcall_sync(nx_ctx, &nx_ctx->op_aead,
|
||||
req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
|
||||
if (rc)
|
||||
goto out;
|
||||
|
||||
atomic_inc(&(nx_ctx->stats->aes_ops));
|
||||
atomic64_add(req->assoclen, &(nx_ctx->stats->aes_bytes));
|
||||
|
||||
memcpy(out, csbcpb_aead->cpb.aes_gca.out_pat, AES_BLOCK_SIZE);
|
||||
out:
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int gcm_aes_nx_crypt(struct aead_request *req, int enc)
|
||||
{
|
||||
struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
|
||||
struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
|
||||
struct blkcipher_desc desc;
|
||||
unsigned int nbytes = req->cryptlen;
|
||||
int rc = -EINVAL;
|
||||
|
||||
if (nbytes > nx_ctx->ap->databytelen)
|
||||
goto out;
|
||||
|
||||
desc.info = nx_ctx->priv.gcm.iv;
|
||||
/* initialize the counter */
|
||||
*(u32 *)(desc.info + NX_GCM_CTR_OFFSET) = 1;
|
||||
|
||||
/* For scenarios where the input message is zero length, AES CTR mode
|
||||
* may be used. Set the source data to be a single block (16B) of all
|
||||
* zeros, and set the input IV value to be the same as the GMAC IV
|
||||
* value. - nx_wb 4.8.1.3 */
|
||||
if (nbytes == 0) {
|
||||
char src[AES_BLOCK_SIZE] = {};
|
||||
struct scatterlist sg;
|
||||
|
||||
desc.tfm = crypto_alloc_blkcipher("ctr(aes)", 0, 0);
|
||||
if (IS_ERR(desc.tfm)) {
|
||||
rc = -ENOMEM;
|
||||
goto out;
|
||||
}
|
||||
|
||||
crypto_blkcipher_setkey(desc.tfm, csbcpb->cpb.aes_gcm.key,
|
||||
NX_CPB_KEY_SIZE(csbcpb) == NX_KS_AES_128 ? 16 :
|
||||
NX_CPB_KEY_SIZE(csbcpb) == NX_KS_AES_192 ? 24 : 32);
|
||||
|
||||
sg_init_one(&sg, src, AES_BLOCK_SIZE);
|
||||
if (enc)
|
||||
crypto_blkcipher_encrypt_iv(&desc, req->dst, &sg,
|
||||
AES_BLOCK_SIZE);
|
||||
else
|
||||
crypto_blkcipher_decrypt_iv(&desc, req->dst, &sg,
|
||||
AES_BLOCK_SIZE);
|
||||
crypto_free_blkcipher(desc.tfm);
|
||||
|
||||
rc = 0;
|
||||
goto out;
|
||||
}
|
||||
|
||||
desc.tfm = (struct crypto_blkcipher *)req->base.tfm;
|
||||
|
||||
csbcpb->cpb.aes_gcm.bit_length_aad = req->assoclen * 8;
|
||||
|
||||
if (req->assoclen) {
|
||||
rc = nx_gca(nx_ctx, req, csbcpb->cpb.aes_gcm.in_pat_or_aad);
|
||||
if (rc)
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (enc)
|
||||
NX_CPB_FDM(csbcpb) |= NX_FDM_ENDE_ENCRYPT;
|
||||
else
|
||||
nbytes -= AES_BLOCK_SIZE;
|
||||
|
||||
csbcpb->cpb.aes_gcm.bit_length_data = nbytes * 8;
|
||||
|
||||
rc = nx_build_sg_lists(nx_ctx, &desc, req->dst, req->src, nbytes,
|
||||
csbcpb->cpb.aes_gcm.iv_or_cnt);
|
||||
if (rc)
|
||||
goto out;
|
||||
|
||||
rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
|
||||
req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
|
||||
if (rc)
|
||||
goto out;
|
||||
|
||||
atomic_inc(&(nx_ctx->stats->aes_ops));
|
||||
atomic64_add(csbcpb->csb.processed_byte_count,
|
||||
&(nx_ctx->stats->aes_bytes));
|
||||
|
||||
if (enc) {
|
||||
/* copy out the auth tag */
|
||||
scatterwalk_map_and_copy(csbcpb->cpb.aes_gcm.out_pat_or_mac,
|
||||
req->dst, nbytes,
|
||||
crypto_aead_authsize(crypto_aead_reqtfm(req)),
|
||||
SCATTERWALK_TO_SG);
|
||||
} else if (req->assoclen) {
|
||||
u8 *itag = nx_ctx->priv.gcm.iauth_tag;
|
||||
u8 *otag = csbcpb->cpb.aes_gcm.out_pat_or_mac;
|
||||
|
||||
scatterwalk_map_and_copy(itag, req->dst, nbytes,
|
||||
crypto_aead_authsize(crypto_aead_reqtfm(req)),
|
||||
SCATTERWALK_FROM_SG);
|
||||
rc = memcmp(itag, otag,
|
||||
crypto_aead_authsize(crypto_aead_reqtfm(req))) ?
|
||||
-EBADMSG : 0;
|
||||
}
|
||||
out:
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int gcm_aes_nx_encrypt(struct aead_request *req)
|
||||
{
|
||||
struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
|
||||
char *iv = nx_ctx->priv.gcm.iv;
|
||||
|
||||
memcpy(iv, req->iv, 12);
|
||||
|
||||
return gcm_aes_nx_crypt(req, 1);
|
||||
}
|
||||
|
||||
static int gcm_aes_nx_decrypt(struct aead_request *req)
|
||||
{
|
||||
struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
|
||||
char *iv = nx_ctx->priv.gcm.iv;
|
||||
|
||||
memcpy(iv, req->iv, 12);
|
||||
|
||||
return gcm_aes_nx_crypt(req, 0);
|
||||
}
|
||||
|
||||
static int gcm4106_aes_nx_encrypt(struct aead_request *req)
|
||||
{
|
||||
struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
|
||||
char *iv = nx_ctx->priv.gcm.iv;
|
||||
char *nonce = nx_ctx->priv.gcm.nonce;
|
||||
|
||||
memcpy(iv, nonce, NX_GCM4106_NONCE_LEN);
|
||||
memcpy(iv + NX_GCM4106_NONCE_LEN, req->iv, 8);
|
||||
|
||||
return gcm_aes_nx_crypt(req, 1);
|
||||
}
|
||||
|
||||
static int gcm4106_aes_nx_decrypt(struct aead_request *req)
|
||||
{
|
||||
struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
|
||||
char *iv = nx_ctx->priv.gcm.iv;
|
||||
char *nonce = nx_ctx->priv.gcm.nonce;
|
||||
|
||||
memcpy(iv, nonce, NX_GCM4106_NONCE_LEN);
|
||||
memcpy(iv + NX_GCM4106_NONCE_LEN, req->iv, 8);
|
||||
|
||||
return gcm_aes_nx_crypt(req, 0);
|
||||
}
|
||||
|
||||
/* tell the block cipher walk routines that this is a stream cipher by
|
||||
* setting cra_blocksize to 1. Even using blkcipher_walk_virt_block
|
||||
* during encrypt/decrypt doesn't solve this problem, because it calls
|
||||
* blkcipher_walk_done under the covers, which doesn't use walk->blocksize,
|
||||
* but instead uses this tfm->blocksize. */
|
||||
struct crypto_alg nx_gcm_aes_alg = {
|
||||
.cra_name = "gcm(aes)",
|
||||
.cra_driver_name = "gcm-aes-nx",
|
||||
.cra_priority = 300,
|
||||
.cra_flags = CRYPTO_ALG_TYPE_AEAD,
|
||||
.cra_blocksize = 1,
|
||||
.cra_ctxsize = sizeof(struct nx_crypto_ctx),
|
||||
.cra_type = &crypto_aead_type,
|
||||
.cra_module = THIS_MODULE,
|
||||
.cra_list = LIST_HEAD_INIT(nx_gcm_aes_alg.cra_list),
|
||||
.cra_init = nx_crypto_ctx_aes_gcm_init,
|
||||
.cra_exit = nx_crypto_ctx_exit,
|
||||
.cra_aead = {
|
||||
.ivsize = AES_BLOCK_SIZE,
|
||||
.maxauthsize = AES_BLOCK_SIZE,
|
||||
.setkey = gcm_aes_nx_set_key,
|
||||
.setauthsize = gcm_aes_nx_setauthsize,
|
||||
.encrypt = gcm_aes_nx_encrypt,
|
||||
.decrypt = gcm_aes_nx_decrypt,
|
||||
}
|
||||
};
|
||||
|
||||
struct crypto_alg nx_gcm4106_aes_alg = {
|
||||
.cra_name = "rfc4106(gcm(aes))",
|
||||
.cra_driver_name = "rfc4106-gcm-aes-nx",
|
||||
.cra_priority = 300,
|
||||
.cra_flags = CRYPTO_ALG_TYPE_AEAD,
|
||||
.cra_blocksize = 1,
|
||||
.cra_ctxsize = sizeof(struct nx_crypto_ctx),
|
||||
.cra_type = &crypto_nivaead_type,
|
||||
.cra_module = THIS_MODULE,
|
||||
.cra_list = LIST_HEAD_INIT(nx_gcm4106_aes_alg.cra_list),
|
||||
.cra_init = nx_crypto_ctx_aes_gcm_init,
|
||||
.cra_exit = nx_crypto_ctx_exit,
|
||||
.cra_aead = {
|
||||
.ivsize = 8,
|
||||
.maxauthsize = AES_BLOCK_SIZE,
|
||||
.geniv = "seqiv",
|
||||
.setkey = gcm4106_aes_nx_set_key,
|
||||
.setauthsize = gcm4106_aes_nx_setauthsize,
|
||||
.encrypt = gcm4106_aes_nx_encrypt,
|
||||
.decrypt = gcm4106_aes_nx_decrypt,
|
||||
}
|
||||
};
|
||||
Loading…
Reference in New Issue
Block a user