mirrors/linux
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-05-03 19:26:01 -04:00
Code Issues Packages Projects Releases Wiki Activity

crypto: hisilicon/hpre - Add processing of src_data in 'CURVE25519'

Browse Source 
HPRE can only deal with src_data smaller than 'p' in 'CURVE25519'
algorithm, but 'rfc7748' says:
'Implementations MUST accept non-canonical values and process them as
if they had been reduced modulo the field prime'
So we get its modulus to p, and then deal it with HPRE.

Signed-off-by: Meng Yu <yumeng18@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Meng Yu
2021-03-27 17:56:16 +08:00
committed by Herbert Xu
parent 9bb3fbbff3
commit 0ae869926f
1 changed files with 18 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
drivers/crypto/hisilicon/hpre/hpre_crypto.c
View File

@@ -1729,6 +1729,17 @@ static int hpre_curve25519_msg_request_set(struct hpre_ctx *ctx,
return 0;
}
static void hpre_curve25519_src_modulo_p(u8 *ptr)
{
int i;
for (i = 0; i < CURVE25519_KEY_SIZE - 1; i++)
ptr[i] = 0;
/* The modulus is ptr's last byte minus '0xed'(last byte of p) */
ptr[i] -= 0xed;
}
static int hpre_curve25519_src_init(struct hpre_asym_request *hpre_req,
struct scatterlist *data, unsigned int len)
{
@@ -1767,10 +1778,13 @@ static int hpre_curve25519_src_init(struct hpre_asym_request *hpre_req,
curve = ecc_get_curve25519();
fill_curve_param(p, curve->p, CURVE25519_KEY_SIZE, curve->g.ndigits);
if (memcmp(ptr, p, ctx->key_sz) >= 0) {
dev_err(dev, "gx is out of p!\n");
goto err;
}
/*
* When src_data equals (2^255 - 19) ~ (2^255 - 1), it is out of p,
* we get its modulus to p, and then use it.
*/
if (memcmp(ptr, p, ctx->key_sz) >= 0)
hpre_curve25519_src_modulo_p(ptr);
hpre_req->src = ptr;
msg->in = cpu_to_le64(dma);