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crypto: caam - strip input without changing crypto request

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For rsa and pkcs1pad, CAAM expects an input of modulus size.
For this we strip the leading zeros in case the size is more than modulus.
This commit avoids modifying the crypto request while stripping zeros from
input, to comply with the crypto API requirement. This is done by adding
a fixup input pointer and length.

Signed-off-by: Iuliana Prodan <iuliana.prodan@nxp.com>
Reviewed-by: Horia Geanta <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Iuliana Prodan 2019-05-28 12:52:11 +03:00 committed by Herbert Xu
parent c3725f7ccc
commit 3b2614cb86
2 changed files with 32 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
drivers/crypto/caam/caampkc.c
View File

@ -32,8 +32,10 @@ static u8 *zero_buffer;
static void rsa_io_unmap(struct device *dev, struct rsa_edesc *edesc,
struct akcipher_request *req)
{
struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
dma_unmap_sg(dev, req->dst, edesc->dst_nents, DMA_FROM_DEVICE);
dma_unmap_sg(dev, req->src, edesc->src_nents, DMA_TO_DEVICE);
dma_unmap_sg(dev, req_ctx->fixup_src, edesc->src_nents, DMA_TO_DEVICE);
if (edesc->sec4_sg_bytes)
dma_unmap_single(dev, edesc->sec4_sg_dma, edesc->sec4_sg_bytes,
@ -251,17 +253,21 @@ static struct rsa_edesc *rsa_edesc_alloc(struct akcipher_request *req,
if (lzeros < 0)
return ERR_PTR(lzeros);
req->src_len -= lzeros;
req->src = scatterwalk_ffwd(req_ctx->src, req->src, lzeros);
req_ctx->fixup_src = scatterwalk_ffwd(req_ctx->src, req->src,
lzeros);
req_ctx->fixup_src_len = req->src_len - lzeros;
} else {
/*
* input src is less then n key modulus,
* so there will be zero padding
*/
diff_size = key->n_sz - req->src_len;
req_ctx->fixup_src = req->src;
req_ctx->fixup_src_len = req->src_len;
}
src_nents = sg_nents_for_len(req->src, req->src_len);
src_nents = sg_nents_for_len(req_ctx->fixup_src,
req_ctx->fixup_src_len);
dst_nents = sg_nents_for_len(req->dst, req->dst_len);
if (!diff_size && src_nents == 1)
@ -282,7 +288,7 @@ static struct rsa_edesc *rsa_edesc_alloc(struct akcipher_request *req,
if (!edesc)
return ERR_PTR(-ENOMEM);
sgc = dma_map_sg(dev, req->src, src_nents, DMA_TO_DEVICE);
sgc = dma_map_sg(dev, req_ctx->fixup_src, src_nents, DMA_TO_DEVICE);
if (unlikely(!sgc)) {
dev_err(dev, "unable to map source\n");
goto src_fail;
@ -300,8 +306,8 @@ static struct rsa_edesc *rsa_edesc_alloc(struct akcipher_request *req,
0);
if (sec4_sg_index)
sg_to_sec4_sg_last(req->src, src_nents, edesc->sec4_sg +
!!diff_size, 0);
sg_to_sec4_sg_last(req_ctx->fixup_src, src_nents,
edesc->sec4_sg + !!diff_size, 0);
if (dst_nents > 1)
sg_to_sec4_sg_last(req->dst, dst_nents,
@ -332,7 +338,7 @@ static struct rsa_edesc *rsa_edesc_alloc(struct akcipher_request *req,
sec4_sg_fail:
dma_unmap_sg(dev, req->dst, dst_nents, DMA_FROM_DEVICE);
dst_fail:
dma_unmap_sg(dev, req->src, src_nents, DMA_TO_DEVICE);
dma_unmap_sg(dev, req_ctx->fixup_src, src_nents, DMA_TO_DEVICE);
src_fail:
kfree(edesc);
return ERR_PTR(-ENOMEM);
@ -342,6 +348,7 @@ static int set_rsa_pub_pdb(struct akcipher_request *req,
struct rsa_edesc *edesc)
{
struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
struct caam_rsa_key *key = &ctx->key;
struct device *dev = ctx->dev;
@ -366,7 +373,7 @@ static int set_rsa_pub_pdb(struct akcipher_request *req,
pdb->f_dma = edesc->sec4_sg_dma;
sec4_sg_index += edesc->src_nents;
} else {
pdb->f_dma = sg_dma_address(req->src);
pdb->f_dma = sg_dma_address(req_ctx->fixup_src);
}
if (edesc->dst_nents > 1) {
@ -378,7 +385,7 @@ static int set_rsa_pub_pdb(struct akcipher_request *req,
}
pdb->sgf |= (key->e_sz << RSA_PDB_E_SHIFT) | key->n_sz;
pdb->f_len = req->src_len;
pdb->f_len = req_ctx->fixup_src_len;
return 0;
}
@ -411,7 +418,9 @@ static int set_rsa_priv_f1_pdb(struct akcipher_request *req,
pdb->g_dma = edesc->sec4_sg_dma;
sec4_sg_index += edesc->src_nents;
} else {
pdb->g_dma = sg_dma_address(req->src);
struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
pdb->g_dma = sg_dma_address(req_ctx->fixup_src);
}
if (edesc->dst_nents > 1) {
@ -474,7 +483,9 @@ static int set_rsa_priv_f2_pdb(struct akcipher_request *req,
pdb->g_dma = edesc->sec4_sg_dma;
sec4_sg_index += edesc->src_nents;
} else {
pdb->g_dma = sg_dma_address(req->src);
struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
pdb->g_dma = sg_dma_address(req_ctx->fixup_src);
}
if (edesc->dst_nents > 1) {
@ -561,7 +572,9 @@ static int set_rsa_priv_f3_pdb(struct akcipher_request *req,
pdb->g_dma = edesc->sec4_sg_dma;
sec4_sg_index += edesc->src_nents;
} else {
pdb->g_dma = sg_dma_address(req->src);
struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
pdb->g_dma = sg_dma_address(req_ctx->fixup_src);
}
if (edesc->dst_nents > 1) {

7
drivers/crypto/caam/caampkc.h
View File

@ -95,14 +95,19 @@ struct caam_rsa_ctx {
struct caam_rsa_key key;
struct device *dev;
dma_addr_t padding_dma;
};
/**
* caam_rsa_req_ctx - per request context.
* @src: input scatterlist (stripped of leading zeros)
* @src : input scatterlist (stripped of leading zeros)
* @fixup_src : input scatterlist (that might be stripped of leading zeros)
* @fixup_src_len : length of the fixup_src input scatterlist
*/
struct caam_rsa_req_ctx {
struct scatterlist src[2];
struct scatterlist *fixup_src;
unsigned int fixup_src_len;
};
/**