+#include <ccan/crypto/shachain/shachain.h>
+/* Include the C files directly. */
+#include <ccan/crypto/shachain/shachain.c>
+#include <ccan/tap/tap.h>
+
+#define NUM_TESTS 1000
+
+int main(void)
+{
+ struct sha256 seed;
+ struct shachain chain;
+ size_t i;
+
+ plan_tests(NUM_TESTS);
+
+ memset(&seed, 0xFF, sizeof(seed));
+ shachain_init(&chain);
+
+ for (i = 0; i < NUM_TESTS; i++) {
+ struct sha256 expect;
+ unsigned int num_known = chain.num_valid;
+
+ shachain_from_seed(&seed, i, &expect);
+ /* Screw it up. */
+ expect.u.u8[0]++;
+
+ /* Either it should fail, or it couldn't derive any others. */
+ if (shachain_add_hash(&chain, i, &expect)) {
+ ok1(chain.num_valid == num_known + 1);
+ /* Fix it up in-place */
+ chain.known[num_known].hash.u.u8[0]--;
+ } else {
+ expect.u.u8[0]--;
+ ok1(shachain_add_hash(&chain, i, &expect));
+ }
+ }
+ return exit_status();
+}