make post failure simulation reversible in all cases

fips/fips.h

@@ -97,9 +97,8 @@ int FIPS_selftest_rsa(void);
 int FIPS_selftest_dsa(void);
 int FIPS_selftest_ecdsa(void);
 int FIPS_selftest_ecdh(void);
-void FIPS_corrupt_drbg(void);
-void FIPS_x931_stick(void);
-void FIPS_drbg_stick(void);
+void FIPS_x931_stick(int onoff);
+void FIPS_drbg_stick(int onoff);
 int FIPS_selftest_x931(void);
 int FIPS_selftest_hmac(void);
 int FIPS_selftest_drbg(void);

fips/fips_test_suite.c

@@ -1104,9 +1104,9 @@ int main(int argc, char **argv)
     if (!FIPS_module_mode())
 	return 1;
     if (do_drbg_stick)
-            FIPS_drbg_stick();
+            FIPS_drbg_stick(1);
     if (do_rng_stick)
-            FIPS_x931_stick();
+            FIPS_x931_stick(1);
 
     /* AES encryption/decryption
     */

fips/rand/fips_drbg_lib.c

@@ -544,9 +544,9 @@ void FIPS_drbg_set_reseed_interval(DRBG_CTX *dctx, int interval)
 
 static int drbg_stick = 0;
 
-void FIPS_drbg_stick(void)
+void FIPS_drbg_stick(int onoff)
 	{
-	drbg_stick = 1;
+	drbg_stick = onoff;
 	}
 
 /* Continuous DRBG utility function */

fips/rand/fips_rand.c

@@ -114,9 +114,9 @@ static FIPS_PRNG_CTX sctx;
 
 static int fips_prng_fail = 0;
 
-void FIPS_x931_stick(void)
+void FIPS_x931_stick(int onoff)
 	{
-	fips_prng_fail = 1;
+	fips_prng_fail = onoff;
 	}
 
 static void fips_rand_prng_reset(FIPS_PRNG_CTX *ctx)

fips/rand/fips_rand_selftest.c

@@ -129,15 +129,16 @@ static AES_PRNG_TV aes_256_tv =
 static int do_x931_test(unsigned char *key, int keylen,
 			AES_PRNG_TV *tv)
 	{
-	unsigned char R[16];
+	unsigned char R[16], V[16];
 	int rv = 1;
+	memcpy(V, tv->V, sizeof(V));
 	if (!FIPS_x931_set_key(key, keylen))
 		return 0;
 	if (!fips_post_started(FIPS_TEST_X931, keylen, NULL))
 		return 1;
 	if (!fips_post_corrupt(FIPS_TEST_X931, keylen, NULL))
-		tv->V[0]++;
-	FIPS_x931_seed(tv->V, 16);
+		V[0]++;
+	FIPS_x931_seed(V, 16);
 	FIPS_x931_set_dt(tv->DT);
 	FIPS_x931_bytes(R, 16);
 	if (memcmp(R, tv->R, 16))