62 lines
1.7 KiB
Vala
62 lines
1.7 KiB
Vala
using Xmpp.Util;
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namespace Dino.Plugins.Omemo {
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public static string fingerprint_from_base64(string b64) {
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uint8[] arr = Base64.decode(b64);
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arr = arr[1:arr.length];
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string s = "";
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foreach (uint8 i in arr) {
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string tmp = i.to_string("%x");
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if (tmp.length == 1) tmp = "0" + tmp;
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s = s + tmp;
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}
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return s;
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}
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public static string fingerprint_markup(string s) {
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string markup = "";
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for (int i = 0; i < s.length; i += 4) {
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string four_chars = s.substring(i, 4).down();
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int raw = (int) from_hex(four_chars);
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uint8[] bytes = {(uint8) ((raw >> 8) & 0xff - 128), (uint8) (raw & 0xff - 128)};
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Checksum checksum = new Checksum(ChecksumType.SHA1);
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checksum.update(bytes, bytes.length);
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uint8[] digest = new uint8[20];
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size_t len = 20;
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checksum.get_digest(digest, ref len);
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uint8 r = digest[0];
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uint8 g = digest[1];
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uint8 b = digest[2];
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if (r == 0 && g == 0 && b == 0) r = g = b = 1;
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double brightness = 0.2126 * r + 0.7152 * g + 0.0722 * b;
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if (brightness < 80) {
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double factor = 80.0 / brightness;
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r = uint8.min(255, (uint8) (r * factor));
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g = uint8.min(255, (uint8) (g * factor));
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b = uint8.min(255, (uint8) (b * factor));
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} else if (brightness > 180) {
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double factor = 180.0 / brightness;
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r = (uint8) (r * factor);
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g = (uint8) (g * factor);
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b = (uint8) (b * factor);
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}
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markup += @"<span foreground=\"$("#%02x%02x%02x".printf(r, g, b))\">$four_chars</span>";
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if (i % 8 == 4) markup += " ";
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}
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return "<span font_family='monospace' font='8'>" + markup + "</span>";
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}
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}
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