#include "test.h"int dsa_test(void){   unsigned char msg[16], out[1024], out2[1024];   unsigned long x, y;   int err, stat1, stat2;   dsa_key key, key2;   /* make a random key */   DO(dsa_make_key(&test_yarrow, find_prng("yarrow"), 20, 128, &key));   /* verify it */   DO(dsa_verify_key(&key, &stat1));   if (stat1 == 0) { printf("dsa_verify_key "); return 1; }   /* sign the message */   x = sizeof(out);   DO(dsa_sign_hash(msg, sizeof(msg), out, &x, &test_yarrow, find_prng("yarrow"), &key));   /* verify it once */   DO(dsa_verify_hash(out, x, msg, sizeof(msg), &stat1, &key));   /* Modify and verify again */   msg[0] ^= 1;   DO(dsa_verify_hash(out, x, msg, sizeof(msg), &stat2, &key));   msg[0] ^= 1;   if (!(stat1 == 1 && stat2 == 0)) { printf("dsa_verify %d %d", stat1, stat2); return 1; }   /* test exporting it */   x = sizeof(out2);   DO(dsa_export(out2, &x, PK_PRIVATE, &key));   DO(dsa_import(out2, x, &key2));   /* verify a signature with it */   DO(dsa_verify_hash(out, x, msg, sizeof(msg), &stat1, &key2));   if (stat1 == 0) { printf("dsa_verify (import private) %d ", stat1); return 1; }   dsa_free(&key2);   /* export as public now */   x = sizeof(out2);   DO(dsa_export(out2, &x, PK_PUBLIC, &key));   DO(dsa_import(out2, x, &key2));   /* verify a signature with it */   DO(dsa_verify_hash(out, x, msg, sizeof(msg), &stat1, &key2));   if (stat1 == 0) { printf("dsa_verify (import public) %d ", stat1); return 1; }   dsa_free(&key2);   dsa_free(&key);   return 0;}