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Fix a typo in a comment

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Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
This commit is contained in:
Manuel Pégourié-Gonnard 2020-08-25 11:43:10 +02:00
parent 46f49a8bbc
commit ab9ec32879
1 changed files with 8 additions and 26 deletions
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34
library/ssl_tls.c
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@ -1435,27 +1435,6 @@ static void ssl_mac( mbedtls_md_context_t *md_ctx,
#define SSL_SOME_MODES_USE_MAC #define SSL_SOME_MODES_USE_MAC
#endif #endif
/* The function below is only used in the Lucky 13 counter-measure in
* ssl_decrypt_buf(). These are the defines that guard the call site. */
#if defined(SSL_SOME_MODES_USE_MAC) && \
( defined(MBEDTLS_SSL_PROTO_TLS1) || \
defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
defined(MBEDTLS_SSL_PROTO_TLS1_2) )
/* This function makes sure every byte in the memory region is accessed
* (in ascending addresses order) */
static void ssl_read_memory( const unsigned char *p, size_t len )
{
unsigned char acc = 0;
volatile unsigned char force;
for( ; len != 0; p++, len-- )
acc ^= *p;
force = acc;
(void) force;
}
#endif /* SSL_SOME_MODES_USE_MAC && ( TLS1 || TLS1_1 || TLS1_2 ) */
/* /*
* Encryption/decryption functions * Encryption/decryption functions
*/ */
@ -1935,7 +1914,7 @@ cleanup:
/* /*
* Constant-flow memcpy from variable position in buffer. * Constant-flow memcpy from variable position in buffer.
* - functionally equivalent to memcpy(dst, src + offset_secret, len) * - functionally equivalent to memcpy(dst, src + offset_secret, len)
* - but with execution flow independant from the value of offset_secret. * - but with execution flow independent from the value of offset_secret.
*/ */
void mbedtls_ssl_cf_memcpy_offset( unsigned char *dst, void mbedtls_ssl_cf_memcpy_offset( unsigned char *dst,
const unsigned char *src_base, const unsigned char *src_base,
@ -1943,10 +1922,13 @@ void mbedtls_ssl_cf_memcpy_offset( unsigned char *dst,
size_t offset_min, size_t offset_max, size_t offset_min, size_t offset_max,
size_t len ) size_t len )
{ {
/* WIP - THIS IS NOT ACTUALLY CONSTANT-FLOW! size_t offset;
* This is just to be able to write tests and check they work. */
ssl_read_memory( src_base + offset_min, offset_max - offset_min + len ); for( offset = offset_min; offset <= offset_max; offset++ )
memcpy( dst, src_base + offset_secret, len ); {
mbedtls_ssl_cf_memcpy_if_eq( dst, src_base + offset, len,
offset, offset_secret );
}
} }
#endif /* MBEDTLS_SSL_SOME_SUITES_USE_TLS_CBC */ #endif /* MBEDTLS_SSL_SOME_SUITES_USE_TLS_CBC */