Commit 4de9d0b5 authored by Lee Nipper's avatar Lee Nipper Committed by Herbert Xu

crypto: talitos - Add ablkcipher algorithms

Add these ablkcipher algorithms:
cbc(aes),
cbc(des3_ede).

Added handling of chained scatterlists with zero length entry
because eseqiv uses it.
Added new map and unmap routines.
Signed-off-by: default avatarLee Nipper <lee.nipper@gmail.com>
Signed-off-by: default avatarKim Phillips <kim.phillips@freescale.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 56af8cd4
......@@ -44,6 +44,8 @@
#include <crypto/sha.h>
#include <crypto/aead.h>
#include <crypto/authenc.h>
#include <crypto/skcipher.h>
#include <crypto/scatterwalk.h>
#include "talitos.h"
......@@ -755,12 +757,62 @@ static int aead_setkey(struct crypto_aead *authenc,
struct talitos_edesc {
int src_nents;
int dst_nents;
int src_is_chained;
int dst_is_chained;
int dma_len;
dma_addr_t dma_link_tbl;
struct talitos_desc desc;
struct talitos_ptr link_tbl[0];
};
static int talitos_map_sg(struct device *dev, struct scatterlist *sg,
unsigned int nents, enum dma_data_direction dir,
int chained)
{
if (unlikely(chained))
while (sg) {
dma_map_sg(dev, sg, 1, dir);
sg = scatterwalk_sg_next(sg);
}
else
dma_map_sg(dev, sg, nents, dir);
return nents;
}
static void talitos_unmap_sg_chain(struct device *dev, struct scatterlist *sg,
enum dma_data_direction dir)
{
while (sg) {
dma_unmap_sg(dev, sg, 1, dir);
sg = scatterwalk_sg_next(sg);
}
}
static void talitos_sg_unmap(struct device *dev,
struct talitos_edesc *edesc,
struct scatterlist *src,
struct scatterlist *dst)
{
unsigned int src_nents = edesc->src_nents ? : 1;
unsigned int dst_nents = edesc->dst_nents ? : 1;
if (src != dst) {
if (edesc->src_is_chained)
talitos_unmap_sg_chain(dev, src, DMA_TO_DEVICE);
else
dma_unmap_sg(dev, src, src_nents, DMA_TO_DEVICE);
if (edesc->dst_is_chained)
talitos_unmap_sg_chain(dev, dst, DMA_FROM_DEVICE);
else
dma_unmap_sg(dev, dst, dst_nents, DMA_FROM_DEVICE);
} else
if (edesc->src_is_chained)
talitos_unmap_sg_chain(dev, src, DMA_BIDIRECTIONAL);
else
dma_unmap_sg(dev, src, src_nents, DMA_BIDIRECTIONAL);
}
static void ipsec_esp_unmap(struct device *dev,
struct talitos_edesc *edesc,
struct aead_request *areq)
......@@ -772,15 +824,7 @@ static void ipsec_esp_unmap(struct device *dev,
dma_unmap_sg(dev, areq->assoc, 1, DMA_TO_DEVICE);
if (areq->src != areq->dst) {
dma_unmap_sg(dev, areq->src, edesc->src_nents ? : 1,
DMA_TO_DEVICE);
dma_unmap_sg(dev, areq->dst, edesc->dst_nents ? : 1,
DMA_FROM_DEVICE);
} else {
dma_unmap_sg(dev, areq->src, edesc->src_nents ? : 1,
DMA_BIDIRECTIONAL);
}
talitos_sg_unmap(dev, edesc, areq->src, areq->dst);
if (edesc->dma_len)
dma_unmap_single(dev, edesc->dma_link_tbl, edesc->dma_len,
......@@ -886,7 +930,7 @@ static int sg_to_link_tbl(struct scatterlist *sg, int sg_count,
link_tbl_ptr->j_extent = 0;
link_tbl_ptr++;
cryptlen -= sg_dma_len(sg);
sg = sg_next(sg);
sg = scatterwalk_sg_next(sg);
}
/* adjust (decrease) last one (or two) entry's len to cryptlen */
......@@ -952,12 +996,11 @@ static int ipsec_esp(struct talitos_edesc *edesc, struct aead_request *areq,
desc->ptr[4].len = cpu_to_be16(cryptlen);
desc->ptr[4].j_extent = authsize;
if (areq->src == areq->dst)
sg_count = dma_map_sg(dev, areq->src, edesc->src_nents ? : 1,
DMA_BIDIRECTIONAL);
else
sg_count = dma_map_sg(dev, areq->src, edesc->src_nents ? : 1,
DMA_TO_DEVICE);
sg_count = talitos_map_sg(dev, areq->src,
edesc->src_nents ? : 1,
(areq->src == areq->dst) ? DMA_BIDIRECTIONAL :
DMA_TO_DEVICE,
edesc->src_is_chained);
if (sg_count == 1) {
desc->ptr[4].ptr = cpu_to_be32(sg_dma_address(areq->src));
......@@ -986,8 +1029,10 @@ static int ipsec_esp(struct talitos_edesc *edesc, struct aead_request *areq,
desc->ptr[5].j_extent = authsize;
if (areq->src != areq->dst) {
sg_count = dma_map_sg(dev, areq->dst, edesc->dst_nents ? : 1,
DMA_FROM_DEVICE);
sg_count = talitos_map_sg(dev, areq->dst,
edesc->dst_nents ? : 1,
DMA_FROM_DEVICE,
edesc->dst_is_chained);
}
if (sg_count == 1) {
......@@ -1037,15 +1082,18 @@ static int ipsec_esp(struct talitos_edesc *edesc, struct aead_request *areq,
/*
* derive number of elements in scatterlist
*/
static int sg_count(struct scatterlist *sg_list, int nbytes)
static int sg_count(struct scatterlist *sg_list, int nbytes, int *chained)
{
struct scatterlist *sg = sg_list;
int sg_nents = 0;
while (nbytes) {
*chained = 0;
while (nbytes > 0) {
sg_nents++;
nbytes -= sg->length;
sg = sg_next(sg);
if (!sg_is_last(sg) && (sg + 1)->length == 0)
*chained = 1;
sg = scatterwalk_sg_next(sg);
}
return sg_nents;
......@@ -1054,28 +1102,32 @@ static int sg_count(struct scatterlist *sg_list, int nbytes)
/*
* allocate and map the extended descriptor
*/
static struct talitos_edesc *ipsec_esp_edesc_alloc(struct aead_request *areq,
int icv_stashing)
static struct talitos_edesc *talitos_edesc_alloc(struct device *dev,
struct scatterlist *src,
struct scatterlist *dst,
unsigned int cryptlen,
unsigned int authsize,
int icv_stashing,
u32 cryptoflags)
{
struct crypto_aead *authenc = crypto_aead_reqtfm(areq);
struct talitos_ctx *ctx = crypto_aead_ctx(authenc);
struct talitos_edesc *edesc;
int src_nents, dst_nents, alloc_len, dma_len;
gfp_t flags = areq->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL :
int src_chained, dst_chained = 0;
gfp_t flags = cryptoflags & CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL :
GFP_ATOMIC;
if (areq->cryptlen + ctx->authsize > TALITOS_MAX_DATA_LEN) {
dev_err(ctx->dev, "cryptlen exceeds h/w max limit\n");
if (cryptlen + authsize > TALITOS_MAX_DATA_LEN) {
dev_err(dev, "length exceeds h/w max limit\n");
return ERR_PTR(-EINVAL);
}
src_nents = sg_count(areq->src, areq->cryptlen + ctx->authsize);
src_nents = sg_count(src, cryptlen + authsize, &src_chained);
src_nents = (src_nents == 1) ? 0 : src_nents;
if (areq->dst == areq->src) {
if (dst == src) {
dst_nents = src_nents;
} else {
dst_nents = sg_count(areq->dst, areq->cryptlen + ctx->authsize);
dst_nents = sg_count(dst, cryptlen + authsize, &dst_chained);
dst_nents = (dst_nents == 1) ? 0 : dst_nents;
}
......@@ -1087,28 +1139,41 @@ static struct talitos_edesc *ipsec_esp_edesc_alloc(struct aead_request *areq,
alloc_len = sizeof(struct talitos_edesc);
if (src_nents || dst_nents) {
dma_len = (src_nents + dst_nents + 2) *
sizeof(struct talitos_ptr) + ctx->authsize;
sizeof(struct talitos_ptr) + authsize;
alloc_len += dma_len;
} else {
dma_len = 0;
alloc_len += icv_stashing ? ctx->authsize : 0;
alloc_len += icv_stashing ? authsize : 0;
}
edesc = kmalloc(alloc_len, GFP_DMA | flags);
if (!edesc) {
dev_err(ctx->dev, "could not allocate edescriptor\n");
dev_err(dev, "could not allocate edescriptor\n");
return ERR_PTR(-ENOMEM);
}
edesc->src_nents = src_nents;
edesc->dst_nents = dst_nents;
edesc->src_is_chained = src_chained;
edesc->dst_is_chained = dst_chained;
edesc->dma_len = dma_len;
edesc->dma_link_tbl = dma_map_single(ctx->dev, &edesc->link_tbl[0],
edesc->dma_link_tbl = dma_map_single(dev, &edesc->link_tbl[0],
edesc->dma_len, DMA_BIDIRECTIONAL);
return edesc;
}
static struct talitos_edesc *aead_edesc_alloc(struct aead_request *areq,
int icv_stashing)
{
struct crypto_aead *authenc = crypto_aead_reqtfm(areq);
struct talitos_ctx *ctx = crypto_aead_ctx(authenc);
return talitos_edesc_alloc(ctx->dev, areq->src, areq->dst,
areq->cryptlen, ctx->authsize, icv_stashing,
areq->base.flags);
}
static int aead_encrypt(struct aead_request *req)
{
struct crypto_aead *authenc = crypto_aead_reqtfm(req);
......@@ -1116,7 +1181,7 @@ static int aead_encrypt(struct aead_request *req)
struct talitos_edesc *edesc;
/* allocate extended descriptor */
edesc = ipsec_esp_edesc_alloc(req, 0);
edesc = aead_edesc_alloc(req, 0);
if (IS_ERR(edesc))
return PTR_ERR(edesc);
......@@ -1141,7 +1206,7 @@ static int aead_decrypt(struct aead_request *req)
req->cryptlen -= authsize;
/* allocate extended descriptor */
edesc = ipsec_esp_edesc_alloc(req, 1);
edesc = aead_edesc_alloc(req, 1);
if (IS_ERR(edesc))
return PTR_ERR(edesc);
......@@ -1188,7 +1253,7 @@ static int aead_givencrypt(struct aead_givcrypt_request *req)
struct talitos_edesc *edesc;
/* allocate extended descriptor */
edesc = ipsec_esp_edesc_alloc(areq, 0);
edesc = aead_edesc_alloc(areq, 0);
if (IS_ERR(edesc))
return PTR_ERR(edesc);
......@@ -1203,6 +1268,199 @@ static int aead_givencrypt(struct aead_givcrypt_request *req)
ipsec_esp_encrypt_done);
}
static int ablkcipher_setkey(struct crypto_ablkcipher *cipher,
const u8 *key, unsigned int keylen)
{
struct talitos_ctx *ctx = crypto_ablkcipher_ctx(cipher);
struct ablkcipher_alg *alg = crypto_ablkcipher_alg(cipher);
if (keylen > TALITOS_MAX_KEY_SIZE)
goto badkey;
if (keylen < alg->min_keysize || keylen > alg->max_keysize)
goto badkey;
memcpy(&ctx->key, key, keylen);
ctx->keylen = keylen;
return 0;
badkey:
crypto_ablkcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
}
static void common_nonsnoop_unmap(struct device *dev,
struct talitos_edesc *edesc,
struct ablkcipher_request *areq)
{
unmap_single_talitos_ptr(dev, &edesc->desc.ptr[5], DMA_FROM_DEVICE);
unmap_single_talitos_ptr(dev, &edesc->desc.ptr[2], DMA_TO_DEVICE);
unmap_single_talitos_ptr(dev, &edesc->desc.ptr[1], DMA_TO_DEVICE);
talitos_sg_unmap(dev, edesc, areq->src, areq->dst);
if (edesc->dma_len)
dma_unmap_single(dev, edesc->dma_link_tbl, edesc->dma_len,
DMA_BIDIRECTIONAL);
}
static void ablkcipher_done(struct device *dev,
struct talitos_desc *desc, void *context,
int err)
{
struct ablkcipher_request *areq = context;
struct talitos_edesc *edesc =
container_of(desc, struct talitos_edesc, desc);
common_nonsnoop_unmap(dev, edesc, areq);
kfree(edesc);
areq->base.complete(&areq->base, err);
}
static int common_nonsnoop(struct talitos_edesc *edesc,
struct ablkcipher_request *areq,
u8 *giv,
void (*callback) (struct device *dev,
struct talitos_desc *desc,
void *context, int error))
{
struct crypto_ablkcipher *cipher = crypto_ablkcipher_reqtfm(areq);
struct talitos_ctx *ctx = crypto_ablkcipher_ctx(cipher);
struct device *dev = ctx->dev;
struct talitos_desc *desc = &edesc->desc;
unsigned int cryptlen = areq->nbytes;
unsigned int ivsize;
int sg_count, ret;
/* first DWORD empty */
desc->ptr[0].len = 0;
desc->ptr[0].ptr = 0;
desc->ptr[0].j_extent = 0;
/* cipher iv */
ivsize = crypto_ablkcipher_ivsize(cipher);
map_single_talitos_ptr(dev, &desc->ptr[1], ivsize, giv ?: areq->info, 0,
DMA_TO_DEVICE);
/* cipher key */
map_single_talitos_ptr(dev, &desc->ptr[2], ctx->keylen,
(char *)&ctx->key, 0, DMA_TO_DEVICE);
/*
* cipher in
*/
desc->ptr[3].len = cpu_to_be16(cryptlen);
desc->ptr[3].j_extent = 0;
sg_count = talitos_map_sg(dev, areq->src, edesc->src_nents ? : 1,
(areq->src == areq->dst) ? DMA_BIDIRECTIONAL
: DMA_TO_DEVICE,
edesc->src_is_chained);
if (sg_count == 1) {
desc->ptr[3].ptr = cpu_to_be32(sg_dma_address(areq->src));
} else {
sg_count = sg_to_link_tbl(areq->src, sg_count, cryptlen,
&edesc->link_tbl[0]);
if (sg_count > 1) {
desc->ptr[3].j_extent |= DESC_PTR_LNKTBL_JUMP;
desc->ptr[3].ptr = cpu_to_be32(edesc->dma_link_tbl);
dma_sync_single_for_device(ctx->dev, edesc->dma_link_tbl,
edesc->dma_len, DMA_BIDIRECTIONAL);
} else {
/* Only one segment now, so no link tbl needed */
desc->ptr[3].ptr = cpu_to_be32(sg_dma_address(areq->src));
}
}
/* cipher out */
desc->ptr[4].len = cpu_to_be16(cryptlen);
desc->ptr[4].j_extent = 0;
if (areq->src != areq->dst)
sg_count = talitos_map_sg(dev, areq->dst,
edesc->dst_nents ? : 1,
DMA_FROM_DEVICE,
edesc->dst_is_chained);
if (sg_count == 1) {
desc->ptr[4].ptr = cpu_to_be32(sg_dma_address(areq->dst));
} else {
struct talitos_ptr *link_tbl_ptr =
&edesc->link_tbl[edesc->src_nents + 1];
desc->ptr[4].j_extent |= DESC_PTR_LNKTBL_JUMP;
desc->ptr[4].ptr = cpu_to_be32((struct talitos_ptr *)
edesc->dma_link_tbl +
edesc->src_nents + 1);
sg_count = sg_to_link_tbl(areq->dst, sg_count, cryptlen,
link_tbl_ptr);
dma_sync_single_for_device(ctx->dev, edesc->dma_link_tbl,
edesc->dma_len, DMA_BIDIRECTIONAL);
}
/* iv out */
map_single_talitos_ptr(dev, &desc->ptr[5], ivsize, ctx->iv, 0,
DMA_FROM_DEVICE);
/* last DWORD empty */
desc->ptr[6].len = 0;
desc->ptr[6].ptr = 0;
desc->ptr[6].j_extent = 0;
ret = talitos_submit(dev, desc, callback, areq);
if (ret != -EINPROGRESS) {
common_nonsnoop_unmap(dev, edesc, areq);
kfree(edesc);
}
return ret;
}
static struct talitos_edesc *ablkcipher_edesc_alloc(struct ablkcipher_request *areq)
{
struct crypto_ablkcipher *cipher = crypto_ablkcipher_reqtfm(areq);
struct talitos_ctx *ctx = crypto_ablkcipher_ctx(cipher);
return talitos_edesc_alloc(ctx->dev, areq->src, areq->dst, areq->nbytes,
0, 0, areq->base.flags);
}
static int ablkcipher_encrypt(struct ablkcipher_request *areq)
{
struct crypto_ablkcipher *cipher = crypto_ablkcipher_reqtfm(areq);
struct talitos_ctx *ctx = crypto_ablkcipher_ctx(cipher);
struct talitos_edesc *edesc;
/* allocate extended descriptor */
edesc = ablkcipher_edesc_alloc(areq);
if (IS_ERR(edesc))
return PTR_ERR(edesc);
/* set encrypt */
edesc->desc.hdr = ctx->desc_hdr_template | DESC_HDR_MODE0_ENCRYPT;
return common_nonsnoop(edesc, areq, NULL, ablkcipher_done);
}
static int ablkcipher_decrypt(struct ablkcipher_request *areq)
{
struct crypto_ablkcipher *cipher = crypto_ablkcipher_reqtfm(areq);
struct talitos_ctx *ctx = crypto_ablkcipher_ctx(cipher);
struct talitos_edesc *edesc;
/* allocate extended descriptor */
edesc = ablkcipher_edesc_alloc(areq);
if (IS_ERR(edesc))
return PTR_ERR(edesc);
edesc->desc.hdr = ctx->desc_hdr_template | DESC_HDR_DIR_INBOUND;
return common_nonsnoop(edesc, areq, NULL, ablkcipher_done);
}
struct talitos_alg_template {
struct crypto_alg alg;
__be32 desc_hdr_template;
......@@ -1368,6 +1626,52 @@ static struct talitos_alg_template driver_algs[] = {
DESC_HDR_MODE1_MDEU_INIT |
DESC_HDR_MODE1_MDEU_PAD |
DESC_HDR_MODE1_MDEU_MD5_HMAC,
},
/* ABLKCIPHER algorithms. */
{
.alg = {
.cra_name = "cbc(aes)",
.cra_driver_name = "cbc-aes-talitos",
.cra_blocksize = AES_BLOCK_SIZE,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
CRYPTO_ALG_ASYNC,
.cra_type = &crypto_ablkcipher_type,
.cra_ablkcipher = {
.setkey = ablkcipher_setkey,
.encrypt = ablkcipher_encrypt,
.decrypt = ablkcipher_decrypt,
.geniv = "eseqiv",
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.ivsize = AES_BLOCK_SIZE,
}
},
.desc_hdr_template = DESC_HDR_TYPE_COMMON_NONSNOOP_NO_AFEU |
DESC_HDR_SEL0_AESU |
DESC_HDR_MODE0_AESU_CBC,
},
{
.alg = {
.cra_name = "cbc(des3_ede)",
.cra_driver_name = "cbc-3des-talitos",
.cra_blocksize = DES3_EDE_BLOCK_SIZE,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
CRYPTO_ALG_ASYNC,
.cra_type = &crypto_ablkcipher_type,
.cra_ablkcipher = {
.setkey = ablkcipher_setkey,
.encrypt = ablkcipher_encrypt,
.decrypt = ablkcipher_decrypt,
.geniv = "eseqiv",
.min_keysize = DES3_EDE_KEY_SIZE,
.max_keysize = DES3_EDE_KEY_SIZE,
.ivsize = DES3_EDE_BLOCK_SIZE,
}
},
.desc_hdr_template = DESC_HDR_TYPE_COMMON_NONSNOOP_NO_AFEU |
DESC_HDR_SEL0_DEU |
DESC_HDR_MODE0_DEU_CBC |
DESC_HDR_MODE0_DEU_3DES,
}
};
......
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