1 files changed, 36 insertions, 0 deletions

diff --git a/nacl/tests/auth5.c b/nacl/tests/auth5.c
new file mode 100644
index 00000000..d304a073
--- /dev/null
+++ b/nacl/tests/auth5.c
@@ -0,0 +1,36 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include "crypto_auth_hmacsha512256.h"
+#include "randombytes.h"
+
+unsigned char key[32];
+unsigned char c[10000];
+unsigned char a[32];
+
+main()
+{
+  int clen;
+  int i;
+  for (clen = 0;clen < 10000;++clen) {
+    randombytes(key,sizeof key);
+    randombytes(c,clen);
+    crypto_auth_hmacsha512256(a,c,clen,key);
+    if (crypto_auth_hmacsha512256_verify(a,c,clen,key) != 0) {
+      printf("fail %d\n",clen);
+      return 100;
+    }
+    if (clen > 0) {
+      c[random() % clen] += 1 + (random() % 255);
+      if (crypto_auth_hmacsha512256_verify(a,c,clen,key) == 0) {
+        printf("forgery %d\n",clen);
+        return 100;
+      }
+      a[random() % sizeof a] += 1 + (random() % 255);
+      if (crypto_auth_hmacsha512256_verify(a,c,clen,key) == 0) {
+        printf("forgery %d\n",clen);
+        return 100;
+      }
+    }
+  }
+  return 0;
+}