unikernel/duniverse/dune_/vendor/sha/util.h

@@ -0,0 +1,35 @@
+#ifndef UTIL_H
+#define UTIL_H
+
+static int hex_to_int(char c)
+{
+    if ('0' <= c && c <= '9')
+        return c - '0';
+    else if ('a' <= c && c <= 'f')
+        return c - 'a' + 10;
+    else if ('A' <= c && c <= 'F')
+        return c - 'A' + 10;
+    else
+        return -1;
+}
+
+static int of_hex(unsigned char *dst, const char *src, int n)
+{
+    int i;
+
+    if (n % 2 != 0)
+        return -1;
+    for (i = 0; i < n/2; i++) {
+        int a, b;
+        a = hex_to_int(src[i*2]);
+        if(a < 0)
+            return -1;
+        b = hex_to_int(src[i*2 + 1]);
+        if(b < 0)
+            return -1;
+        dst[i] = a*16 + b;
+    }
+    return n/2;
+}
+
+#endif