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Remove last use of non-bit operations

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According to https://www.bearssl.org/ctmul.html even single-precision
multiplication is not constant-time on some older platforms.

An added benefit of the new code is that it removes the somewhat mysterious
constant 0x1ff - which was selected because at that point the maximum value of
padlen was 256. The new code is perhaps a bit more readable for that reason.

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
This commit is contained in:
Manuel Pégourié-Gonnard 2020-09-18 09:54:01 +02:00
parent 2a59fb45b5
commit 822b3729e7
1 changed files with 1 additions and 1 deletions
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2
library/ssl_msg.c
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@ -1679,7 +1679,7 @@ int mbedtls_ssl_decrypt_buf( mbedtls_ssl_context const *ssl,
if( padlen > 0 && correct == 0 ) if( padlen > 0 && correct == 0 )
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad padding byte detected" ) ); MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad padding byte detected" ) );
#endif #endif
padlen &= correct * 0x1FF; padlen &= mbedtls_ssl_cf_mask_from_bit( correct );
} }
else else
#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \ #endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \