generichash_stream example

demos/generichash.c

@@ -53,7 +53,7 @@ void
 generichash(void)
 {
     unsigned char key[crypto_generichash_KEYBYTES_MAX];
-    unsigned char hash[crypto_generichash_BYTES_MIN];
+    unsigned char hash[crypto_generichash_BYTES];
     unsigned char message[MAX_INPUT_SIZE];
     size_t        message_len;
     size_t        key_len;

demos/generichash_stream.c

@@ -0,0 +1,63 @@
+/*
+ * GraxRabble
+ * Demo programs for libsodium.
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <sodium.h> /* library header */
+
+#include "utils.h" /* utility functions shared by demos */
+
+/*
+ * Streaming variant of generic hash. This has the ability to hash
+ * data in chunks at a time and compute the same result as hashing
+ * all of the data at once.
+ */
+void
+generichash_stream(void)
+{
+    unsigned char            key[crypto_generichash_KEYBYTES_MAX];
+    unsigned char            hash[crypto_generichash_BYTES];
+    unsigned char            message_part[MAX_INPUT_SIZE];
+    crypto_generichash_state state;
+    size_t                   message_part_len;
+
+    puts("Example: crypto_generichashstream\n");
+
+    prompt_input("a key", (char*)key, sizeof key, 1);
+    putchar('\n');
+
+    printf("Hashing message with %s\n", crypto_generichash_primitive());
+
+    /* initialize the stream */
+    if (crypto_generichash_init(&state, key, sizeof key, sizeof hash) != 0) {
+        puts("Couldn't hash the message, probably due to the key length");
+        exit(EXIT_FAILURE);
+    }
+
+    for(;;) {
+        message_part_len = prompt_input("the next part of the message",
+                                        (char*)message_part, sizeof message_part, 1);
+        if (message_part_len == 0)
+            break;
+
+        /* keep appending data */
+        crypto_generichash_update(&state, message_part, message_part_len);
+    }
+    crypto_generichash_final(&state, hash, sizeof hash);
+
+    fputs("Hash: ", stdout);
+    print_hex(hash, sizeof hash);
+    putchar('\n');
+}
+
+int
+main(void)
+{
+    init();
+    generichash_stream();
+
+    return 0;
+}

demos/generichashstream.c

@@ -1,60 +0,0 @@
-/*
- * GraxRabble
- * Demo programs for libsodium.
- */
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include <sodium.h> /* library header */
-
-#include "utils.h" /* utility functions shared by demos */
-
-/*
- * Streaming variant of generic hash. This has the ability to hash
- * data in chunks at a time and compute the same result as hashing
- * all of the data at once.
- */
-void
-generichashstream(void)
-{
-    unsigned char k[crypto_generichash_KEYBYTES_MAX]; /* key */
-    unsigned char h[crypto_generichash_BYTES_MIN];    /* hash output */
-    crypto_generichash_state state;                   /* hash stream */
-    unsigned char m[MAX_INPUT_SIZE];                  /* input buffer */
-    size_t mlen;                                      /* input length */
-
-    puts("Example: crypto_generichashstream\n");
-
-    prompt_input("a key", (char*)k, sizeof k, 0);
-    putchar('\n');
-
-    printf("Hashing message with %s\n", crypto_generichash_primitive());
-
-    /* initialize the stream */
-    crypto_generichash_init(&state, k, sizeof k, sizeof h);
-
-    for(;;) {
-        mlen = prompt_input("the next part of the message", (char*)m, sizeof m);
-        if (mlen == 0)
-            break;
-
-        /* keep appending data */
-        crypto_generichash_update(&state, m, mlen);
-    }
-    crypto_generichash_final(&state, h, sizeof h);
-    putchar('\n');
-
-    fputs("Hash: ", stdout);
-    print_hex(h, sizeof h);
-    putchar('\n');
-}
-
-int
-main(void)
-{
-    init();
-    generichashstream();
-
-    return 0;
-}