Zeroize internal buffers and variables in MD hashes
Zeroising of local buffers and variables which are used for calculations in
mbedtls_internal_md*_process() and mbedtls_internal_ripemd160_process()
functions to erase sensitive data from memory.
Checked all function for possible missing zeroisation in MD.
Signed-off-by: gabor-mezei-arm <gabor.mezei@arm.com>
diff --git a/library/md5.c b/library/md5.c
index fe25925..df783c3 100644
--- a/library/md5.c
+++ b/library/md5.c
@@ -265,6 +265,13 @@
ctx->state[2] += C;
ctx->state[3] += D;
+ /* Zeroise variables to clear sensitive data from memory. */
+ mbedtls_platform_zeroize( &X, sizeof( X ) );
+ mbedtls_platform_zeroize( &A, sizeof( A ) );
+ mbedtls_platform_zeroize( &B, sizeof( B ) );
+ mbedtls_platform_zeroize( &C, sizeof( C ) );
+ mbedtls_platform_zeroize( &D, sizeof( D ) );
+
return( 0 );
}