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Add guarding to aes_maybe_realign

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Signed-off-by: Thomas Daubney <thomas.daubney@arm.com>
This commit is contained in:
Thomas Daubney 2024-06-20 16:43:20 +01:00
parent 95589c5c2e
commit 6a758fc7a1
1 changed files with 3 additions and 0 deletions
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3
library/aes.c
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@ -981,6 +981,7 @@ int mbedtls_internal_aes_decrypt(mbedtls_aes_context *ctx,
*/ */
MBEDTLS_MAYBE_UNUSED static void aes_maybe_realign(mbedtls_aes_context *ctx) MBEDTLS_MAYBE_UNUSED static void aes_maybe_realign(mbedtls_aes_context *ctx)
{ {
#if defined(MAY_NEED_TO_ALIGN)
unsigned new_offset = mbedtls_aes_rk_offset(ctx->buf); unsigned new_offset = mbedtls_aes_rk_offset(ctx->buf);
if (new_offset != ctx->rk_offset) { if (new_offset != ctx->rk_offset) {
memmove(ctx->buf + new_offset, // new address memmove(ctx->buf + new_offset, // new address
@ -988,6 +989,8 @@ MBEDTLS_MAYBE_UNUSED static void aes_maybe_realign(mbedtls_aes_context *ctx)
(ctx->nr + 1) * 16); // number of round keys * bytes per rk (ctx->nr + 1) * 16); // number of round keys * bytes per rk
ctx->rk_offset = new_offset; ctx->rk_offset = new_offset;
} }
#endif /* MAY_NEED_TO_ALIGN */
(void) ctx;
} }
/* /*