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crypto: starfive - Align rsa input data to 32-bit

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[ Upstream commit 6aad7019f6 ]

Hardware expects RSA input plain/ciphertext to be 32-bit aligned.
Set fixed length for preallocated buffer to the maximum supported
keysize of the hardware and shift input text accordingly.

Signed-off-by: Jia Jie Ho <jiajie.ho@starfivetech.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jia Jie Ho 2024-06-26 09:40:42 +08:00 committed by Greg Kroah-Hartman
parent 872f86e175
commit 02b3f88609
2 changed files with 10 additions and 5 deletions
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3
drivers/crypto/starfive/jh7110-cryp.h
View File

@ -30,6 +30,7 @@
#define MAX_KEY_SIZE SHA512_BLOCK_SIZE
#define STARFIVE_AES_IV_LEN AES_BLOCK_SIZE
#define STARFIVE_AES_CTR_LEN AES_BLOCK_SIZE
#define STARFIVE_RSA_MAX_KEYSZ 256
union starfive_aes_csr {
u32 v;
@ -217,7 +218,7 @@ struct starfive_cryp_request_ctx {
unsigned int digsize;
unsigned long in_sg_len;
unsigned char *adata;
u8 rsa_data[] __aligned(sizeof(u32));
u8 rsa_data[STARFIVE_RSA_MAX_KEYSZ] __aligned(sizeof(u32));
};
struct starfive_cryp_dev *starfive_cryp_find_dev(struct starfive_cryp_ctx *ctx);

12
drivers/crypto/starfive/jh7110-rsa.c
View File

@ -37,7 +37,6 @@
// A * A * R mod N ==> A
#define CRYPTO_CMD_AARN 0x7
#define STARFIVE_RSA_MAX_KEYSZ 256
#define STARFIVE_RSA_RESET 0x2
static inline int starfive_pka_wait_done(struct starfive_cryp_ctx *ctx)
@ -91,7 +90,7 @@ static int starfive_rsa_montgomery_form(struct starfive_cryp_ctx *ctx,
{
struct starfive_cryp_dev *cryp = ctx->cryp;
struct starfive_cryp_request_ctx *rctx = ctx->rctx;
int count = rctx->total / sizeof(u32) - 1;
int count = (ALIGN(rctx->total, 4) / 4) - 1;
int loop;
u32 temp;
u8 opsize;
@ -274,12 +273,17 @@ static int starfive_rsa_enc_core(struct starfive_cryp_ctx *ctx, int enc)
struct starfive_cryp_dev *cryp = ctx->cryp;
struct starfive_cryp_request_ctx *rctx = ctx->rctx;
struct starfive_rsa_key *key = &ctx->rsa_key;
int ret = 0;
int ret = 0, shift = 0;
writel(STARFIVE_RSA_RESET, cryp->base + STARFIVE_PKA_CACR_OFFSET);
if (!IS_ALIGNED(rctx->total, sizeof(u32))) {
shift = sizeof(u32) - (rctx->total & 0x3);
memset(rctx->rsa_data, 0, shift);
}
rctx->total = sg_copy_to_buffer(rctx->in_sg, rctx->nents,
rctx->rsa_data, rctx->total);
rctx->rsa_data + shift, rctx->total);
if (enc) {
key->bitlen = key->e_bitlen;