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Propagate usage of mask generation functions

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Signed-off-by: gabor-mezei-arm <gabor.mezei@arm.com>
This commit is contained in:
gabor-mezei-arm 2021-08-11 15:07:02 +02:00
parent 396438c57b
commit 9cb55698aa
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GPG key ID: 106F5A41ECC305BD
3 changed files with 27 additions and 38 deletions
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11
library/ssl_srv.c
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@ -3581,16 +3581,7 @@ static int ssl_parse_encrypted_pms( mbedtls_ssl_context *ssl,
diff |= peer_pms[1] ^ ver[1];
/* mask = diff ? 0xff : 0x00 using bit operations to avoid branches */
/* MSVC has a warning about unary minus on unsigned, but this is
* well-defined and precisely what we want to do here */
#if defined(_MSC_VER)
#pragma warning( push )
#pragma warning( disable : 4146 )
#endif
mask = - ( ( diff | - diff ) >> ( sizeof( unsigned int ) * 8 - 1 ) );
#if defined(_MSC_VER)
#pragma warning( pop )
#endif
mask = mbedtls_cf_uint_mask( diff );
/*
* Protection against Bleichenbacher's attack: invalid PKCS#1 v1.5 padding