Remove some logically dead code

Found by coverity. This is an artifact left over from the original
decaf import which generated the source code for different curves. For
curve 448 this is dead.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/6373)

diff --git a/crypto/ec/curve448/eddsa.c b/crypto/ec/curve448/eddsa.c
index d31887638c37d777be4f3d981bdaf926c79e312e..85565a8dfb16c1c1004bf4a12d536de294233300 100644 (file)
--- a/crypto/ec/curve448/eddsa.c
+++ b/crypto/ec/curve448/eddsa.c
@@ -253,7 +253,6 @@ c448_error_t c448_ed448_verify(
         curve448_point_decode_like_eddsa_and_mul_by_ratio(pk_point, pubkey);
     curve448_scalar_t challenge_scalar;
     curve448_scalar_t response_scalar;
-    unsigned int c;
 
     if (C448_SUCCESS != error)
         return error;
@@ -291,9 +290,6 @@ c448_error_t c448_ed448_verify(
                                 &signature[EDDSA_448_PUBLIC_BYTES],
                                 EDDSA_448_PRIVATE_BYTES);
 
-    for (c = 1; c < C448_EDDSA_DECODE_RATIO; c <<= 1)
-        curve448_scalar_add(response_scalar, response_scalar, response_scalar);
-
     /* pk_point = -c(x(P)) + (cx + k)G = kG */
     curve448_base_double_scalarmul_non_secret(pk_point,
                                               response_scalar,