Fix bad assert in Goppa decoding

1 files changed, 4 insertions, 3 deletions

diff --git a/src/lib/pubkey/mce/goppa_code.cpp b/src/lib/pubkey/mce/goppa_code.cpp
index e28e3b9b0..3cb92aaca 100644
--- a/src/lib/pubkey/mce/goppa_code.cpp
+++ b/src/lib/pubkey/mce/goppa_code.cpp
@@ -90,14 +90,15 @@ secure_vector<gf2m> goppa_decode(const polyn_gf2m & syndrom_polyn,
    // sigma = u^2+z*v^2
    polyn_gf2m sigma ( t , g.get_sp_field());
 
-   const size_t u_deg = u.get_degree();
-   for(size_t i = 0; i <= u_deg; ++i)
+   const int u_deg = u.get_degree();
+   BOTAN_ASSERT(u_deg >= 0, "Valid degree");
+   for(int i = 0; i <= u_deg; ++i)
       {
       sigma.set_coef(2*i, sp_field->gf_square(u.get_coef(i)));
       }
 
    const int v_deg = v.get_degree();
-   BOTAN_ASSERT(v_deg > 0, "Valid degree");
+   BOTAN_ASSERT(v_deg >= 0, "Valid degree");
    for(int i = 0; i <= v_deg; ++i)
       {
       sigma.set_coef(2*i+1, sp_field->gf_square(v.get_coef(i)));