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-rw-r--r--plugins/openpgp/src/util.vala50
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>";
+}
+
+}