Update the examples for libsodium 1.0.7

examples/box.c

@@ -91,7 +91,9 @@ box(void)
 
     /* encrypt and authenticate the message */
     printf("Encrypting and authenticating with %s\n\n", crypto_box_primitive());
-    crypto_box_easy(ciphertext, message, message_len, nonce, alice_pk, bob_sk);
+    if (crypto_box_easy(ciphertext, message, message_len, nonce, alice_pk, bob_sk) != 0) {
+        abort();
+    }
     ciphertext_len = crypto_box_MACBYTES + message_len;
 
     /* send the nonce and the ciphertext */

examples/box_detached.c

@@ -91,8 +91,10 @@ box_detached(void)
 
     /* encrypt and authenticate the message */
     printf("Encrypting and authenticating with %s\n\n", crypto_box_primitive());
-    crypto_box_detached(ciphertext, mac, message, message_len, nonce,
-                        alice_pk, bob_sk);
+    if (crypto_box_detached(ciphertext, mac, message, message_len, nonce,
+                            alice_pk, bob_sk) != 0) {
+        abort();
+    }
 
     /* send the nonce, the MAC and the ciphertext */
     puts("Bob sends the nonce, the MAC and the ciphertext...\n");

examples/utils.h

@@ -99,7 +99,9 @@ print_verification(int ret)
 static void
 init(void)
 {
-    sodium_init();
+    if (sodium_init() != 0) {
+        abort();
+    }
     printf("Using libsodium %s\n", sodium_version_string());
 }