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aes: add a comment about expected keybits value.

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Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
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Andrzej Kurek 2020-07-15 08:50:59 -04:00
parent 11ddf25828
commit a9a5ff5f31
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1 changed files with 2 additions and 0 deletions
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library/aes.c
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@ -725,6 +725,8 @@ int mbedtls_aes_setkey_enc( mbedtls_aes_context *ctx, const unsigned char *key,
return( mbedtls_aesni_setkey_enc( (unsigned char *) ctx->rk, key, keybits ) ); return( mbedtls_aesni_setkey_enc( (unsigned char *) ctx->rk, key, keybits ) );
#endif #endif
/* Three least significant bits are truncated from keybits, which is
* expected to be a multiple of 8. */
mbedtls_platform_memset( RK, 0, keybits >> 3 ); mbedtls_platform_memset( RK, 0, keybits >> 3 );
offset = mbedtls_platform_random_in_range( keybits >> 5 ); offset = mbedtls_platform_random_in_range( keybits >> 5 );