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Merge pull request #3931 from shelib01/plat_rand_buf_FI_protection

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Platform  random buf FI mitigation added
This commit is contained in:
Shelly Liberman 2020-12-02 13:30:25 +02:00 committed by GitHub
commit c6603c501c
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 9 additions and 2 deletions
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2
include/mbedtls/config.h
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@ -2988,7 +2988,7 @@
*
* Uncomment to provide your own alternate implementation for mbedtls_platform_fault(),
* used in library/platform_util.c to signal a fault injection in either
* mbedtls_platform_memcpy or mbedtls_platform_memset.
* mbedtls_platform_memcpy, mbedtls_platform_memset or mbedtls_platform_random_buf.
*
* You will need to provide a header "platform_fault.h" and an implementation at
* compile time.

9
library/platform_util.c
View File

@ -334,6 +334,7 @@ uint32_t mbedtls_platform_random_uint32( void )
void mbedtls_platform_random_buf( uint8_t *buf, size_t len )
{
volatile size_t flow_control = 0;
uint16_t val;
while( len > 1 )
@ -342,13 +343,19 @@ void mbedtls_platform_random_buf( uint8_t *buf, size_t len )
buf[len-1] = (uint8_t)val;
buf[len-2] = (uint8_t)(val>>8);
len -= 2;
flow_control += 2;
}
if( len == 1 )
{
buf[0] = (uint8_t)mbedtls_platform_random_uint16();
flow_control ++;
}
return;
if ( flow_control == len )
{
return;
}
mbedtls_platform_fault();
}
uint32_t mbedtls_platform_random_in_range( uint32_t num )