1 files changed, 50 insertions, 0 deletions
diff --git a/plugins/openpgp/src/util.vala b/plugins/openpgp/src/util.vala
new file mode 100644
index 00000000..7c42b578
--- /dev/null
+++ b/plugins/openpgp/src/util.vala
@@ -0,0 +1,50 @@
+using Gtk;
+
+using Dino.Entities;
+
+namespace Dino.Plugins.OpenPgp {
+
+/* Adapted from OpenKeychain */
+public static string markup_colorize_id(string s, bool is_fingerprint) {
+    string markup = is_fingerprint ? "" : "0x";
+    for (int i = 0; i < s.length; i += 4) {
+        string four_chars = s.substring(i, 4).down();
+
+        int raw = (int) four_chars.to_long(null, 16);
+        uint8[] bytes = {(uint8) ((raw >> 8) & 0xff - 128), (uint8) (raw & 0xff - 128)};
+
+        Checksum checksum = new Checksum(ChecksumType.SHA1);
+        checksum.update(bytes, bytes.length);
+        uint8[] digest = new uint8[20];
+        size_t len = 20;
+        checksum.get_digest(digest, ref len);
+
+        uint8 r = digest[0];
+        uint8 g = digest[1];
+        uint8 b = digest[2];
+
+        if (r == 0 && g == 0 && b == 0) r = g = b = 1;
+
+        double brightness = 0.2126 * r + 0.7152 * g + 0.0722 * b;
+
+        if (brightness < 80) {
+            double factor = 80.0 / brightness;
+            r = uint8.min(255, (uint8) (r * factor));
+            g = uint8.min(255, (uint8) (g * factor));
+            b = uint8.min(255, (uint8) (b * factor));
+
+        } else if (brightness > 180) {
+            double factor = 180.0 / brightness;
+            r = (uint8) (r * factor);
+            g = (uint8) (g * factor);
+            b = (uint8) (b * factor);
+        }
+
+        if (i == 4 * 5) markup += "\n";
+        markup += @"<span foreground=\"$("#%02x%02x%02x".printf(r, g, b))\">$four_chars</span>";
+        if (is_fingerprint) markup += " ";
+    }
+    return "<span font_family='monospace' font='8'>" + markup + "</span>";
+}
+
+}