51 lines
1.2 KiB
PHP
51 lines
1.2 KiB
PHP
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<?php
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/**
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* @file
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* Contains \Drupal\Component\Uuid\Php.
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*/
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namespace Drupal\Component\Uuid;
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use Drupal\Component\Utility\Crypt;
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/**
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* Generates a UUID v4 using PHP code.
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*
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* Loosely based on Ruby's UUIDTools generate_random logic.
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*
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* @see http://uuidtools.rubyforge.org/api/classes/UUIDTools/UUID.html
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*/
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class Php implements UuidInterface {
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/**
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* {@inheritdoc}
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*/
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public function generate() {
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$hex = substr(hash('sha256', Crypt::randomBytes(16)), 0, 32);
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// The field names refer to RFC 4122 section 4.1.2.
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$time_low = substr($hex, 0, 8);
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$time_mid = substr($hex, 8, 4);
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$time_hi_and_version = base_convert(substr($hex, 12, 4), 16, 10);
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$time_hi_and_version &= 0x0FFF;
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$time_hi_and_version |= (4 << 12);
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$clock_seq_hi_and_reserved = base_convert(substr($hex, 16, 4), 16, 10);
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$clock_seq_hi_and_reserved &= 0x3F;
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$clock_seq_hi_and_reserved |= 0x80;
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$clock_seq_low = substr($hex, 20, 2);
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$nodes = substr($hex, 20);
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$uuid = sprintf('%s-%s-%04x-%02x%02x-%s',
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$time_low, $time_mid,
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$time_hi_and_version, $clock_seq_hi_and_reserved,
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$clock_seq_low, $nodes);
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return $uuid;
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}
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}
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