ParagonIE_Sodium_File::verify_core32() public WP 1.0

• Verify a file (rather than a string). Uses less memory than ParagonIE_Sodium_Compat::crypto_sign_verify_detached(), but produces the same result. (32-bit)
• @param string $sig Ed25519 signature @param string $filePath Absolute path to a file on the filesystem @param string $publicKey Signing public key
• @return bool @throws SodiumException @throws Exception

Это метод класса: ParagonIE_Sodium_File{}

Хуков нет.

Возвращает

Null. Ничего.

Использование

$result = ParagonIE_Sodium_File::verify_core32( $sig, $filePath, $publicKey );

Код ParagonIE_Sodium_File::verify_core32() ParagonIE Sodium File::verify core32 ^{WP 5.5.1}

<?php
public static function verify_core32($sig, $filePath, $publicKey)
{
    /* Security checks */
    if (ParagonIE_Sodium_Core32_Ed25519::check_S_lt_L(self::substr($sig, 32, 32))) {
        throw new SodiumException('S < L - Invalid signature');
    }
    if (ParagonIE_Sodium_Core32_Ed25519::small_order($sig)) {
        throw new SodiumException('Signature is on too small of an order');
    }
    if ((self::chrToInt($sig[63]) & 224) !== 0) {
        throw new SodiumException('Invalid signature');
    }
    $d = 0;
    for ($i = 0; $i < 32; ++$i) {
        $d |= self::chrToInt($publicKey[$i]);
    }
    if ($d === 0) {
        throw new SodiumException('All zero public key');
    }

    /** @var int|bool $size */
    $size = filesize($filePath);
    if (!is_int($size)) {
        throw new SodiumException('Could not obtain the file size');
    }
    /** @var int $size */

    /** @var resource|bool $fp */
    $fp = fopen($filePath, 'rb');
    if (!is_resource($fp)) {
        throw new SodiumException('Could not open input file for reading');
    }
    /** @var resource $fp */

    /** @var bool The original value of ParagonIE_Sodium_Compat::$fastMult */
    $orig = ParagonIE_Sodium_Compat::$fastMult;

    // Set ParagonIE_Sodium_Compat::$fastMult to true to speed up verification.
    ParagonIE_Sodium_Compat::$fastMult = true;

    /** @var ParagonIE_Sodium_Core32_Curve25519_Ge_P3 $A */
    $A = ParagonIE_Sodium_Core32_Ed25519::ge_frombytes_negate_vartime($publicKey);

    $hs = hash_init('sha512');
    hash_update($hs, self::substr($sig, 0, 32));
    hash_update($hs, self::substr($publicKey, 0, 32));
    /** @var resource $hs */
    $hs = self::updateHashWithFile($hs, $fp, $size);
    /** @var string $hDigest */
    $hDigest = hash_final($hs, true);

    /** @var string $h */
    $h = ParagonIE_Sodium_Core32_Ed25519::sc_reduce($hDigest) . self::substr($hDigest, 32);

    /** @var ParagonIE_Sodium_Core32_Curve25519_Ge_P2 $R */
    $R = ParagonIE_Sodium_Core32_Ed25519::ge_double_scalarmult_vartime(
        $h,
        $A,
        self::substr($sig, 32)
    );

    /** @var string $rcheck */
    $rcheck = ParagonIE_Sodium_Core32_Ed25519::ge_tobytes($R);

    // Close the file handle
    fclose($fp);

    // Reset ParagonIE_Sodium_Compat::$fastMult to what it was before.
    ParagonIE_Sodium_Compat::$fastMult = $orig;
    return self::verify_32($rcheck, self::substr($sig, 0, 32));
}