| commit | 127fcabb21d6f81664eb9c7f351032f018e52e19 | [log] [tgz] |
|---|---|---|
| author | Hanno Becker <hanno.becker@arm.com> | Tue Apr 12 22:18:36 2022 +0100 |
| committer | Hanno Becker <hanno.becker@arm.com> | Tue Apr 12 22:18:36 2022 +0100 |
| tree | 823ba16539f886718e7f9bd6a9e7e9016159511f | |
| parent | bb04cb992ff1731b6fded7847c140f68fb1a6d46 [diff] [blame] |
Fail gracefully upon unexpectedly large input to p25519 reduction Signed-off-by: Hanno Becker <hanno.becker@arm.com>
diff --git a/library/ecp_curves.c b/library/ecp_curves.c index 571b0fe..5788b0d 100644 --- a/library/ecp_curves.c +++ b/library/ecp_curves.c
@@ -5225,6 +5225,8 @@ const size_t NT_n = N->n - P255_WIDTH; if( N->n <= P255_WIDTH ) return( 0 ); + if( NT_n > P255_WIDTH ) + return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA ); /* Split N as N + 2^256 M */ memset( Mp, 0, sizeof( Mp ) );