PKCS#1v1.5 signature: better cleanup of temporary values
Zeroize temporary buffers used to sanity-check the signature.
If there is an error, overwrite the tentative signature in the output
buffer.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/library/rsa.c b/library/rsa.c
index a395542..8a5d40f 100644
--- a/library/rsa.c
+++ b/library/rsa.c
@@ -1942,9 +1942,13 @@
memcpy( sig, sig_try, ctx->len );
cleanup:
+ mbedtls_platform_zeroize( sig_try, ctx->len );
+ mbedtls_platform_zeroize( verif, ctx->len );
mbedtls_free( sig_try );
mbedtls_free( verif );
+ if( ret != 0 )
+ memset( sig, '!', ctx->len );
return( ret );
}
#endif /* MBEDTLS_PKCS1_V15 */