1 files changed, 41 insertions, 0 deletions
diff --git a/src/c/mhash.c b/src/c/mhash.c
new file mode 100644
index 00000000..becb9d97
--- /dev/null
+++ b/src/c/mhash.c
@@ -0,0 +1,41 @@
+#include <mhash.h>
+
+#define KEYSIZE 16
+#define PASSSIZE 4
+
+#define HASH_ALGORITHM MHASH_SHA256
+#define HASH_BLOCKSIZE 32
+#define KEYGEN_ALGORITHM KEYGEN_MCRYPT
+
+int uw_hash_blocksize = HASH_BLOCKSIZE;
+
+static int password[PASSSIZE];
+static unsigned char private_key[KEYSIZE];
+
+void uw_init_crypto() {
+  KEYGEN kg = {{HASH_ALGORITHM, HASH_ALGORITHM}};
+  int i;
+
+  assert(mhash_get_block_size(HASH_ALGORITHM) == HASH_BLOCKSIZE);
+
+  for (i = 0; i < PASSSIZE; ++i)
+    password[i] = rand();
+
+  if (mhash_keygen_ext(KEYGEN_ALGORITHM, kg,
+                       private_key, sizeof(private_key),
+                       (unsigned char*)password, sizeof(password)) < 0) {
+    fprintf(stderr, "Key generation failed\n");
+    exit(1);
+  }
+}
+
+void uw_sign(const char *in, char *out) {
+  MHASH td;
+
+  td = mhash_hmac_init(HASH_ALGORITHM, private_key, sizeof(private_key),
+                       mhash_get_hash_pblock(HASH_ALGORITHM));
+  
+  mhash(td, in, strlen(in));
+  if (mhash_hmac_deinit(td, out) < 0)
+    fprintf(stderr, "Signing failed\n");
+}