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crypto: x86/ghash - fix unaligned access in ghash_setkey()

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The key can be unaligned, so use the unaligned memory access helpers.

Fixes: 8ceee72808 ("crypto: ghash-clmulni-intel - use C implementation for setkey()")
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers
2022-12-19 21:40:40 -08:00
committed by Herbert Xu
parent 736f88689c
commit 116db2704c
1 changed files with 3 additions and 3 deletions
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6
arch/x86/crypto/ghash-clmulni-intel_glue.c
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@@ -19,6 +19,7 @@
#include <crypto/internal/simd.h>
#include <asm/cpu_device_id.h>
#include <asm/simd.h>
#include <asm/unaligned.h>
#define GHASH_BLOCK_SIZE 16
#define GHASH_DIGEST_SIZE 16
@@ -54,15 +55,14 @@ static int ghash_setkey(struct crypto_shash *tfm,
const u8 *key, unsigned int keylen)
{
struct ghash_ctx *ctx = crypto_shash_ctx(tfm);
be128 *x = (be128 *)key;
u64 a, b;
if (keylen != GHASH_BLOCK_SIZE)
return -EINVAL;
/* perform multiplication by 'x' in GF(2^128) */
a = be64_to_cpu(x->a);
b = be64_to_cpu(x->b);
a = get_unaligned_be64(key);
b = get_unaligned_be64(key + 8);
ctx->shash.a = (b << 1) | (a >> 63);
ctx->shash.b = (a << 1) | (b >> 63);