ecdh: Add test computing shared_secret=basepoint with random inputs

Author: real-or-random

src/modules/ecdh/tests_impl.h

@@ -123,10 +123,40 @@ void test_bad_scalar(void) {
     CHECK(secp256k1_ecdh(ctx, output, &point, s_overflow, ecdh_hash_function_test_fail, NULL) == 0);
 }
 
+void test_result_basepoint(void) {
+    secp256k1_pubkey point;
+    secp256k1_scalar rand;
+    unsigned char s[32];
+    unsigned char s_inv[32];
+    unsigned char out[32];
+    unsigned char out_eq[32];
+    int i;
+
+    for (i = 0; i < 64; i++) {
+        random_scalar_order(&rand);
+        secp256k1_scalar_get_b32(s, &rand);
+        secp256k1_scalar_inverse(&rand, &rand);
+        secp256k1_scalar_get_b32(s_inv, &rand);
+
+        CHECK(secp256k1_ec_pubkey_create(ctx, &point, s) == 1);
+        CHECK(secp256k1_ecdh(ctx, out, &point, s_inv, NULL, NULL) == 1);
+
+        if (i > 0) {
+            CHECK(secp256k1_memcmp_var(out, out_eq, 32) == 0);
+        }
+
+        CHECK(secp256k1_ec_pubkey_create(ctx, &point, s_inv) == 1);
+        CHECK(secp256k1_ecdh(ctx, out_eq, &point, s, NULL, NULL) == 1);
+
+        CHECK(secp256k1_memcmp_var(out, out_eq, 32) == 0);
+    }
+}
+
 void run_ecdh_tests(void) {
     test_ecdh_api();
     test_ecdh_generator_basepoint();
     test_bad_scalar();
+    test_result_basepoint();
 }
 
 #endif /* SECP256K1_MODULE_ECDH_TESTS_H */