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crypto: streebog - fix unaligned memory accesses

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Don't cast the data buffer directly to streebog_uint512, as this
violates alignment rules.

Fixes: fe18957e8e ("crypto: streebog - add Streebog hash function")
Cc: Vitaly Chikunov <vt@altlinux.org>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Vitaly Chikunov <vt@altlinux.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers 2019-03-31 13:04:19 -07:00 committed by Herbert Xu
parent 5e27f38f1f
commit c5c46887cf
2 changed files with 17 additions and 13 deletions
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25
crypto/streebog_generic.c
View File

@ -996,7 +996,7 @@ static void streebog_add512(const struct streebog_uint512 *x,
static void streebog_g(struct streebog_uint512 *h,
const struct streebog_uint512 *N,
const u8 *m)
const struct streebog_uint512 *m)
{
struct streebog_uint512 Ki, data;
unsigned int i;
@ -1005,7 +1005,7 @@ static void streebog_g(struct streebog_uint512 *h,
/* Starting E() */
Ki = data;
streebog_xlps(&Ki, (const struct streebog_uint512 *)&m[0], &data);
streebog_xlps(&Ki, m, &data);
for (i = 0; i < 11; i++)
streebog_round(i, &Ki, &data);
@ -1015,16 +1015,19 @@ static void streebog_g(struct streebog_uint512 *h,
/* E() done */
streebog_xor(&data, h, &data);
streebog_xor(&data, (const struct streebog_uint512 *)&m[0], h);
streebog_xor(&data, m, h);
}
static void streebog_stage2(struct streebog_state *ctx, const u8 *data)
{
streebog_g(&ctx->h, &ctx->N, data);
struct streebog_uint512 m;
memcpy(&m, data, sizeof(m));
streebog_g(&ctx->h, &ctx->N, &m);
streebog_add512(&ctx->N, &buffer512, &ctx->N);
streebog_add512(&ctx->Sigma, (const struct streebog_uint512 *)data,
&ctx->Sigma);
streebog_add512(&ctx->Sigma, &m, &ctx->Sigma);
}
static void streebog_stage3(struct streebog_state *ctx)
@ -1034,13 +1037,11 @@ static void streebog_stage3(struct streebog_state *ctx)
buf.qword[0] = cpu_to_le64(ctx->fillsize << 3);
streebog_pad(ctx);
streebog_g(&ctx->h, &ctx->N, (const u8 *)&ctx->buffer);
streebog_g(&ctx->h, &ctx->N, &ctx->m);
streebog_add512(&ctx->N, &buf, &ctx->N);
streebog_add512(&ctx->Sigma,
(const struct streebog_uint512 *)&ctx->buffer[0],
&ctx->Sigma);
streebog_g(&ctx->h, &buffer0, (const u8 *)&ctx->N);
streebog_g(&ctx->h, &buffer0, (const u8 *)&ctx->Sigma);
streebog_add512(&ctx->Sigma, &ctx->m, &ctx->Sigma);
streebog_g(&ctx->h, &buffer0, &ctx->N);
streebog_g(&ctx->h, &buffer0, &ctx->Sigma);
memcpy(&ctx->hash, &ctx->h, sizeof(struct streebog_uint512));
}

5
include/crypto/streebog.h
View File

@ -23,7 +23,10 @@ struct streebog_uint512 {
};
struct streebog_state {
u8 buffer[STREEBOG_BLOCK_SIZE];
union {
u8 buffer[STREEBOG_BLOCK_SIZE];
struct streebog_uint512 m;
};
struct streebog_uint512 hash;
struct streebog_uint512 h;
struct streebog_uint512 N;