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namespace Dino.Plugins.Omemo {
public static string fingerprint_from_base64(string b64) {
uint8[] arr = Base64.decode(b64);
arr = arr[1:arr.length];
string s = "";
foreach (uint8 i in arr) {
string tmp = i.to_string("%x");
if (tmp.length == 1) tmp = "0" + tmp;
s = s + tmp;
}
return s;
}
public static string fingerprint_markup(string s) {
string markup = "";
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 % 32 == 0 && i != 0) markup += "\n";
markup += @"<span foreground=\"$("#%02x%02x%02x".printf(r, g, b))\">$four_chars</span>";
if (i % 8 == 4 && i % 32 != 28) markup += " ";
}
return "<span font_family='monospace' font='8'>" + markup + "</span>";
}
}
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