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* @param resource $ifp

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* @param string $tag

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* @param int $mlen

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* @return bool

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* @throws SodiumException

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* @throws TypeError

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protected static function onetimeauth_verify_core32(

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ParagonIE_Sodium_Core32_Poly1305_State $state,

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$ifp,

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$tag = '',

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$mlen = 0

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) {

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/** @var int $pos */

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$pos = self::ftell($ifp);

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while ($mlen > 0) {

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$blockSize = $mlen > self::BUFFER_SIZE

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? self::BUFFER_SIZE

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: $mlen;

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$ciphertext = fread($ifp, $blockSize);

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if (!is_string($ciphertext)) {

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throw new SodiumException('Could not read input file');

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}

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$state->update($ciphertext);

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$mlen -= $blockSize;

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}

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$res = ParagonIE_Sodium_Core32_Util::verify_16($tag, $state->finish());

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fseek($ifp, $pos, SEEK_SET);

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return $res;

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}

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/**

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* @param resource $resource

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* @return int

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* @throws SodiumException

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private static function ftell($resource)

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{

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$return = ftell($resource);

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if (!is_int($return)) {

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throw new SodiumException('ftell() returned false');

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}

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return (int) $return;

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}

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}

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