commit 484776547c3f520b9720492f264b02b237970ece
author minosgalanakis <30719586+minosgalanakis@users.noreply.github.com> Thu Aug 22 13:22:26 2024 +0100
committer Minos Galanakis <minos.galanakis@arm.com> Thu Jan 23 15:31:35 2025 +0000
tree a031505495b5c4386c89bb298fa04c92951ec134
parent 18e4b3f08bd6a461e526a9387ae9248a377993b1

Update tf-psa-crypto/drivers/builtin/src/ecp.c

Co-authored-by: Gilles Peskine <gilles.peskine@arm.com>
Signed-off-by: minosgalanakis <30719586+minosgalanakis@users.noreply.github.com>

library/ecp.c

diff --git a/library/ecp.c b/library/ecp.c
index 427059b..fdd00a5 100644
--- a/library/ecp.c
+++ b/library/ecp.c
@@ -3056,7 +3056,7 @@
         /* see RFC 7748 sec. 5 para. 5 */
         if (mbedtls_mpi_get_bit(d, 0) != 0 ||
             mbedtls_mpi_get_bit(d, 1) != 0 ||
-            mbedtls_mpi_bitlen(d) - 1 != grp->nbits) {  /* mbedtls_mpi_bitlen is one-based! */
+            mbedtls_mpi_bitlen(d) != grp->nbits + 1) {  /* mbedtls_mpi_bitlen is one-based! */
             return MBEDTLS_ERR_ECP_INVALID_KEY;
         }