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<?php |
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namespace MadWizard\WebAuthn\Crypto; |
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class Der |
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{ |
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private static function length(int $len): string |
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{ |
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if ($len < 128) { |
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return \chr($len); |
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} |
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$lenBytes = ''; |
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while ($len > 0) { |
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$lenBytes = \chr($len % 256) . $lenBytes; |
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$len = \intdiv($len, 256); |
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} |
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return \chr(0x80 | \strlen($lenBytes)) . $lenBytes; |
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} |
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public static function sequence(string $contents): string |
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{ |
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return "\x30" . self::length(\strlen($contents)) . $contents; |
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} |
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public static function oid(string $encoded): string |
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{ |
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return "\x06" . self::length(\strlen($encoded)) . $encoded; |
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} |
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public static function unsignedInteger(string $bytes): string |
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{ |
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$len = \strlen($bytes); |
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// Remove leading zero bytes |
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for ($i = 0; $i < ($len - 1); $i++) { |
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if (\ord($bytes[$i]) !== 0) { |
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break; |
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} |
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} |
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if ($i !== 0) { |
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$bytes = \substr($bytes, $i); |
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} |
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// If most significant bit is set, prefix with another zero to prevent it being seen as negative number |
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if ((\ord($bytes[0]) & 0x80) !== 0) { |
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$bytes = "\x00" . $bytes; |
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} |
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return "\x02" . self::length(\strlen($bytes)) . $bytes; |
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} |
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public static function bitString(string $bytes): string |
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{ |
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$len = \strlen($bytes) + 1; |
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return "\x03" . self::length($len) . "\x00" . $bytes; |
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} |
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public static function octetString(string $bytes): string |
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{ |
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$len = \strlen($bytes); |
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return "\x04" . self::length($len) . $bytes; |
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} |
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public static function contextTag(int $tag, bool $constructed, string $content): string |
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{ |
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return \chr(($tag & 0x1F) | // Context specific tag number |
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(1 << 7) | // Context-specific flag |
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($constructed ? (1 << 5) : 0)) . |
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self::length(\strlen($content)) . |
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$content; |
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} |
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public static function nullValue(): string |
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{ |
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return "\x05\x00"; |
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} |
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public static function pem(string $type, string $der): string |
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{ |
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return sprintf("-----BEGIN %s-----\n", strtoupper($type)) . |
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chunk_split(base64_encode($der), 64, "\n") . |
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sprintf("-----END %s-----\n", strtoupper($type)); |
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} |
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} |
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madwizard-org /
webauthn-server
