forked from Minki/linux
powerpc/crypto: AES-CCM mode routines for nx encryption
These routines add support for AES in CCM 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
856d673476
commit
a00bd6e60a
468
drivers/crypto/nx/nx-aes-ccm.c
Normal file
468
drivers/crypto/nx/nx-aes-ccm.c
Normal file
@ -0,0 +1,468 @@
|
||||
/**
|
||||
* AES CCM 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 ccm_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;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
csbcpb->cpb.hdr.mode = NX_MODE_AES_CCM;
|
||||
memcpy(csbcpb->cpb.aes_ccm.key, in_key, key_len);
|
||||
|
||||
csbcpb_aead->cpb.hdr.mode = NX_MODE_AES_CCA;
|
||||
memcpy(csbcpb_aead->cpb.aes_cca.key, in_key, key_len);
|
||||
|
||||
return 0;
|
||||
|
||||
}
|
||||
|
||||
static int ccm4309_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);
|
||||
|
||||
if (key_len < 3)
|
||||
return -EINVAL;
|
||||
|
||||
key_len -= 3;
|
||||
|
||||
memcpy(nx_ctx->priv.ccm.nonce, in_key + key_len, 3);
|
||||
|
||||
return ccm_aes_nx_set_key(tfm, in_key, key_len);
|
||||
}
|
||||
|
||||
static int ccm_aes_nx_setauthsize(struct crypto_aead *tfm,
|
||||
unsigned int authsize)
|
||||
{
|
||||
switch (authsize) {
|
||||
case 4:
|
||||
case 6:
|
||||
case 8:
|
||||
case 10:
|
||||
case 12:
|
||||
case 14:
|
||||
case 16:
|
||||
break;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
crypto_aead_crt(tfm)->authsize = authsize;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int ccm4309_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;
|
||||
}
|
||||
|
||||
/* taken from crypto/ccm.c */
|
||||
static int set_msg_len(u8 *block, unsigned int msglen, int csize)
|
||||
{
|
||||
__be32 data;
|
||||
|
||||
memset(block, 0, csize);
|
||||
block += csize;
|
||||
|
||||
if (csize >= 4)
|
||||
csize = 4;
|
||||
else if (msglen > (unsigned int)(1 << (8 * csize)))
|
||||
return -EOVERFLOW;
|
||||
|
||||
data = cpu_to_be32(msglen);
|
||||
memcpy(block - csize, (u8 *)&data + 4 - csize, csize);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* taken from crypto/ccm.c */
|
||||
static inline int crypto_ccm_check_iv(const u8 *iv)
|
||||
{
|
||||
/* 2 <= L <= 8, so 1 <= L' <= 7. */
|
||||
if (1 > iv[0] || iv[0] > 7)
|
||||
return -EINVAL;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* based on code from crypto/ccm.c */
|
||||
static int generate_b0(u8 *iv, unsigned int assoclen, unsigned int authsize,
|
||||
unsigned int cryptlen, u8 *b0)
|
||||
{
|
||||
unsigned int l, lp, m = authsize;
|
||||
int rc;
|
||||
|
||||
memcpy(b0, iv, 16);
|
||||
|
||||
lp = b0[0];
|
||||
l = lp + 1;
|
||||
|
||||
/* set m, bits 3-5 */
|
||||
*b0 |= (8 * ((m - 2) / 2));
|
||||
|
||||
/* set adata, bit 6, if associated data is used */
|
||||
if (assoclen)
|
||||
*b0 |= 64;
|
||||
|
||||
rc = set_msg_len(b0 + 16 - l, cryptlen, l);
|
||||
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int generate_pat(u8 *iv,
|
||||
struct aead_request *req,
|
||||
struct nx_crypto_ctx *nx_ctx,
|
||||
unsigned int authsize,
|
||||
unsigned int nbytes,
|
||||
u8 *out)
|
||||
{
|
||||
struct nx_sg *nx_insg = nx_ctx->in_sg;
|
||||
struct nx_sg *nx_outsg = nx_ctx->out_sg;
|
||||
unsigned int iauth_len = 0;
|
||||
struct vio_pfo_op *op = NULL;
|
||||
u8 tmp[16], *b1 = NULL, *b0 = NULL, *result = NULL;
|
||||
int rc;
|
||||
|
||||
/* zero the ctr value */
|
||||
memset(iv + 15 - iv[0], 0, iv[0] + 1);
|
||||
|
||||
if (!req->assoclen) {
|
||||
b0 = nx_ctx->csbcpb->cpb.aes_ccm.in_pat_or_b0;
|
||||
} else if (req->assoclen <= 14) {
|
||||
/* if associated data is 14 bytes or less, we do 1 GCM
|
||||
* operation on 2 AES blocks, B0 (stored in the csbcpb) and B1,
|
||||
* which is fed in through the source buffers here */
|
||||
b0 = nx_ctx->csbcpb->cpb.aes_ccm.in_pat_or_b0;
|
||||
b1 = nx_ctx->priv.ccm.iauth_tag;
|
||||
iauth_len = req->assoclen;
|
||||
|
||||
nx_insg = nx_build_sg_list(nx_insg, b1, 16, nx_ctx->ap->sglen);
|
||||
nx_outsg = nx_build_sg_list(nx_outsg, tmp, 16,
|
||||
nx_ctx->ap->sglen);
|
||||
|
||||
/* inlen should be negative, indicating to phyp that its a
|
||||
* pointer to an sg list */
|
||||
nx_ctx->op.inlen = (nx_ctx->in_sg - nx_insg) *
|
||||
sizeof(struct nx_sg);
|
||||
nx_ctx->op.outlen = (nx_ctx->out_sg - nx_outsg) *
|
||||
sizeof(struct nx_sg);
|
||||
|
||||
NX_CPB_FDM(nx_ctx->csbcpb) |= NX_FDM_ENDE_ENCRYPT;
|
||||
NX_CPB_FDM(nx_ctx->csbcpb) |= NX_FDM_INTERMEDIATE;
|
||||
|
||||
op = &nx_ctx->op;
|
||||
result = nx_ctx->csbcpb->cpb.aes_ccm.out_pat_or_mac;
|
||||
} else if (req->assoclen <= 65280) {
|
||||
/* if associated data is less than (2^16 - 2^8), we construct
|
||||
* B1 differently and feed in the associated data to a CCA
|
||||
* operation */
|
||||
b0 = nx_ctx->csbcpb_aead->cpb.aes_cca.b0;
|
||||
b1 = nx_ctx->csbcpb_aead->cpb.aes_cca.b1;
|
||||
iauth_len = 14;
|
||||
|
||||
/* remaining assoc data must have scatterlist built for it */
|
||||
nx_insg = nx_walk_and_build(nx_insg, nx_ctx->ap->sglen,
|
||||
req->assoc, iauth_len,
|
||||
req->assoclen - iauth_len);
|
||||
nx_ctx->op_aead.inlen = (nx_ctx->in_sg - nx_insg) *
|
||||
sizeof(struct nx_sg);
|
||||
|
||||
op = &nx_ctx->op_aead;
|
||||
result = nx_ctx->csbcpb_aead->cpb.aes_cca.out_pat_or_b0;
|
||||
} else {
|
||||
/* if associated data is less than (2^32), we construct B1
|
||||
* differently yet again and feed in the associated data to a
|
||||
* CCA operation */
|
||||
pr_err("associated data len is %u bytes (returning -EINVAL)\n",
|
||||
req->assoclen);
|
||||
rc = -EINVAL;
|
||||
}
|
||||
|
||||
rc = generate_b0(iv, req->assoclen, authsize, nbytes, b0);
|
||||
if (rc)
|
||||
goto done;
|
||||
|
||||
if (b1) {
|
||||
memset(b1, 0, 16);
|
||||
*(u16 *)b1 = (u16)req->assoclen;
|
||||
|
||||
scatterwalk_map_and_copy(b1 + 2, req->assoc, 0,
|
||||
iauth_len, SCATTERWALK_FROM_SG);
|
||||
|
||||
rc = nx_hcall_sync(nx_ctx, op,
|
||||
req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
|
||||
if (rc)
|
||||
goto done;
|
||||
|
||||
atomic_inc(&(nx_ctx->stats->aes_ops));
|
||||
atomic64_add(req->assoclen, &(nx_ctx->stats->aes_bytes));
|
||||
|
||||
memcpy(out, result, AES_BLOCK_SIZE);
|
||||
}
|
||||
done:
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int ccm_nx_decrypt(struct aead_request *req,
|
||||
struct blkcipher_desc *desc)
|
||||
{
|
||||
struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
|
||||
struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
|
||||
unsigned int nbytes = req->cryptlen;
|
||||
unsigned int authsize = crypto_aead_authsize(crypto_aead_reqtfm(req));
|
||||
struct nx_ccm_priv *priv = &nx_ctx->priv.ccm;
|
||||
int rc = -1;
|
||||
|
||||
if (nbytes > nx_ctx->ap->databytelen)
|
||||
return -EINVAL;
|
||||
|
||||
nbytes -= authsize;
|
||||
|
||||
/* copy out the auth tag to compare with later */
|
||||
scatterwalk_map_and_copy(priv->oauth_tag,
|
||||
req->src, nbytes, authsize,
|
||||
SCATTERWALK_FROM_SG);
|
||||
|
||||
rc = generate_pat(desc->info, req, nx_ctx, authsize, nbytes,
|
||||
csbcpb->cpb.aes_ccm.in_pat_or_b0);
|
||||
if (rc)
|
||||
goto out;
|
||||
|
||||
rc = nx_build_sg_lists(nx_ctx, desc, req->dst, req->src, nbytes,
|
||||
csbcpb->cpb.aes_ccm.iv_or_ctr);
|
||||
if (rc)
|
||||
goto out;
|
||||
|
||||
NX_CPB_FDM(nx_ctx->csbcpb) &= ~NX_FDM_ENDE_ENCRYPT;
|
||||
NX_CPB_FDM(nx_ctx->csbcpb) &= ~NX_FDM_INTERMEDIATE;
|
||||
|
||||
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));
|
||||
|
||||
rc = memcmp(csbcpb->cpb.aes_ccm.out_pat_or_mac, priv->oauth_tag,
|
||||
authsize) ? -EBADMSG : 0;
|
||||
out:
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int ccm_nx_encrypt(struct aead_request *req,
|
||||
struct blkcipher_desc *desc)
|
||||
{
|
||||
struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
|
||||
struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
|
||||
unsigned int nbytes = req->cryptlen;
|
||||
unsigned int authsize = crypto_aead_authsize(crypto_aead_reqtfm(req));
|
||||
int rc = -1;
|
||||
|
||||
if (nbytes > nx_ctx->ap->databytelen)
|
||||
return -EINVAL;
|
||||
|
||||
rc = generate_pat(desc->info, req, nx_ctx, authsize, nbytes,
|
||||
csbcpb->cpb.aes_ccm.in_pat_or_b0);
|
||||
if (rc)
|
||||
goto out;
|
||||
|
||||
rc = nx_build_sg_lists(nx_ctx, desc, req->dst, req->src, nbytes,
|
||||
csbcpb->cpb.aes_ccm.iv_or_ctr);
|
||||
if (rc)
|
||||
goto out;
|
||||
|
||||
NX_CPB_FDM(csbcpb) |= NX_FDM_ENDE_ENCRYPT;
|
||||
NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
|
||||
|
||||
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));
|
||||
|
||||
/* copy out the auth tag */
|
||||
scatterwalk_map_and_copy(csbcpb->cpb.aes_ccm.out_pat_or_mac,
|
||||
req->dst, nbytes, authsize,
|
||||
SCATTERWALK_TO_SG);
|
||||
out:
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int ccm4309_aes_nx_encrypt(struct aead_request *req)
|
||||
{
|
||||
struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
|
||||
struct blkcipher_desc desc;
|
||||
u8 *iv = nx_ctx->priv.ccm.iv;
|
||||
|
||||
iv[0] = 3;
|
||||
memcpy(iv + 1, nx_ctx->priv.ccm.nonce, 3);
|
||||
memcpy(iv + 4, req->iv, 8);
|
||||
|
||||
desc.info = iv;
|
||||
desc.tfm = (struct crypto_blkcipher *)req->base.tfm;
|
||||
|
||||
return ccm_nx_encrypt(req, &desc);
|
||||
}
|
||||
|
||||
static int ccm_aes_nx_encrypt(struct aead_request *req)
|
||||
{
|
||||
struct blkcipher_desc desc;
|
||||
int rc;
|
||||
|
||||
desc.info = req->iv;
|
||||
desc.tfm = (struct crypto_blkcipher *)req->base.tfm;
|
||||
|
||||
rc = crypto_ccm_check_iv(desc.info);
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
return ccm_nx_encrypt(req, &desc);
|
||||
}
|
||||
|
||||
static int ccm4309_aes_nx_decrypt(struct aead_request *req)
|
||||
{
|
||||
struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
|
||||
struct blkcipher_desc desc;
|
||||
u8 *iv = nx_ctx->priv.ccm.iv;
|
||||
|
||||
iv[0] = 3;
|
||||
memcpy(iv + 1, nx_ctx->priv.ccm.nonce, 3);
|
||||
memcpy(iv + 4, req->iv, 8);
|
||||
|
||||
desc.info = iv;
|
||||
desc.tfm = (struct crypto_blkcipher *)req->base.tfm;
|
||||
|
||||
return ccm_nx_decrypt(req, &desc);
|
||||
}
|
||||
|
||||
static int ccm_aes_nx_decrypt(struct aead_request *req)
|
||||
{
|
||||
struct blkcipher_desc desc;
|
||||
int rc;
|
||||
|
||||
desc.info = req->iv;
|
||||
desc.tfm = (struct crypto_blkcipher *)req->base.tfm;
|
||||
|
||||
rc = crypto_ccm_check_iv(desc.info);
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
return ccm_nx_decrypt(req, &desc);
|
||||
}
|
||||
|
||||
/* 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_ccm_aes_alg = {
|
||||
.cra_name = "ccm(aes)",
|
||||
.cra_driver_name = "ccm-aes-nx",
|
||||
.cra_priority = 300,
|
||||
.cra_flags = CRYPTO_ALG_TYPE_AEAD |
|
||||
CRYPTO_ALG_NEED_FALLBACK,
|
||||
.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_ccm_aes_alg.cra_list),
|
||||
.cra_init = nx_crypto_ctx_aes_ccm_init,
|
||||
.cra_exit = nx_crypto_ctx_exit,
|
||||
.cra_aead = {
|
||||
.ivsize = AES_BLOCK_SIZE,
|
||||
.maxauthsize = AES_BLOCK_SIZE,
|
||||
.setkey = ccm_aes_nx_set_key,
|
||||
.setauthsize = ccm_aes_nx_setauthsize,
|
||||
.encrypt = ccm_aes_nx_encrypt,
|
||||
.decrypt = ccm_aes_nx_decrypt,
|
||||
}
|
||||
};
|
||||
|
||||
struct crypto_alg nx_ccm4309_aes_alg = {
|
||||
.cra_name = "rfc4309(ccm(aes))",
|
||||
.cra_driver_name = "rfc4309-ccm-aes-nx",
|
||||
.cra_priority = 300,
|
||||
.cra_flags = CRYPTO_ALG_TYPE_AEAD |
|
||||
CRYPTO_ALG_NEED_FALLBACK,
|
||||
.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_ccm4309_aes_alg.cra_list),
|
||||
.cra_init = nx_crypto_ctx_aes_ccm_init,
|
||||
.cra_exit = nx_crypto_ctx_exit,
|
||||
.cra_aead = {
|
||||
.ivsize = 8,
|
||||
.maxauthsize = AES_BLOCK_SIZE,
|
||||
.setkey = ccm4309_aes_nx_set_key,
|
||||
.setauthsize = ccm4309_aes_nx_setauthsize,
|
||||
.encrypt = ccm4309_aes_nx_encrypt,
|
||||
.decrypt = ccm4309_aes_nx_decrypt,
|
||||
.geniv = "seqiv",
|
||||
}
|
||||
};
|
||||
Loading…
Reference in New Issue
Block a user