hash_final - PHP code example

PHP Functions

A php function is a code segment that executes at runtime. The function accepts input data from the calling code and returns the result of its execution. Functions allow you to extend the capabilities of your PHP program and enable it to perform a range of different tasks, such as formatting numbers, creating passwords, and encrypting data.

String Functions

PHP provides a variety of string manipulation functions, including strlen() for the length of a string, substr() for extracting substrings, str_replace() for replacing text within a string, and strtolower() and strtoupper() for converting characters to lowercase or uppercase. These functions make it easy to manipulate and organize strings in your application.

Mathematical Functions

PHP includes a number of basic arithmetic functions, such as abs() for calculating the absolute value, sqrt() for square root, pow() for exponentiation, round() for rounding numbers, and rand() for generating random numbers. Additionally, there are several other functions available to perform more complex arithmetic calculations and operations.

Hashing Functions

Hashing is a process that transforms the original value of a piece of information into an encoded form that can be transmitted over text-only channels without fear of data loss or corruption. There are a number of different hashing functions implemented in PHP, all with their own unique properties and uses. The hash() function is one of these, accepting three arguments to generate a hash value: the algorithm name, the string value, and an optional third argument that can be set to return lowercase hex digits or raw binary data.

hash_final example

$this->classReflector ??= new \ReflectionClass($this->className);
        } catch (\ReflectionException) {
            // the class does not exist anymore             return false;
        }
        $hash = hash_init('xxh128');

        foreach ($this->generateSignature($this->classReflector) as $info) {
            hash_update($hash, $info);
        }

        return hash_final($hash);
    }

    private function generateSignature(\ReflectionClass $class): iterable
    {
        $attributes = [];
        foreach ($class->getAttributes() as $a) {
            $attributes[] = [$a->getName(), (string) $a];
        }
        yield print_r($attributes, true);
        $attributes = [];

// Add trailing Line return if last line is non empty         if ('' !== $currentLine) {
            hash_update($hash, "\r\n");
            $length += \strlen("\r\n");
        }

        if (!$relaxed && 0 === $length) {
            hash_update($hash, "\r\n");
            $length = 2;
        }

        return [hash_final($hash, true), $length];
    }
}

        $h = array_fill(0, $hLen, 0);
        $ctx_len = !is_null($ctx) ? self::strlen($ctx) : 0;
        if ($hLen > 0xff) {
            throw new SodiumException('Hash must be less than 256 bytes');
        }

        if ($ctx_len > 0xff) {
            $st = hash_init('sha256');
            self::hash_update($st, "H2C-OVERSIZE-DST-");
            self::hash_update($st, $ctx);
            $ctx = hash_final($st, true);
            $ctx_len = 32;
        }
        $t = array(0, $hLen, 0);
        $ux = str_repeat("\0", 64);
        $st = hash_init('sha256');
        self::hash_update($st, $ux);
        self::hash_update($st, $msg);
        self::hash_update($st, self::intArrayToString($t));
        self::hash_update($st, $ctx);
        self::hash_update($st, self::intToChr($ctx_len));
        $u0 = hash_final($st, true);

        # az[31] |= 64;         $az[0] = self::intToChr(self::chrToInt($az[0]) & 248);
        $az[31] = self::intToChr((self::chrToInt($az[31]) & 63) | 64);

        # crypto_hash_sha512_init(&hs);         # crypto_hash_sha512_update(&hs, az + 32, 32);         # crypto_hash_sha512_update(&hs, m, mlen);         # crypto_hash_sha512_final(&hs, nonce);         $hs = hash_init('sha512');
        hash_update($hs, self::substr($az, 32, 32));
        hash_update($hs, $message);
        $nonceHash = hash_final($hs, true);

        # memmove(sig + 32, sk + 32, 32);         $pk = self::substr($sk, 32, 32);

        # sc_reduce(nonce);         # ge_scalarmult_base(&R, nonce);         # ge_p3_tobytes(sig, &R);         $nonce = self::sc_reduce($nonceHash) . self::substr($nonceHash, 32);
        $sig = self::ge_p3_tobytes(
            self::ge_scalarmult_base($nonce)
        );

        # az[31] |= 64;         $az[0] = self::intToChr(self::chrToInt($az[0]) & 248);
        $az[31] = self::intToChr((self::chrToInt($az[31]) & 63) | 64);

        # crypto_hash_sha512_init(&hs);         # crypto_hash_sha512_update(&hs, az + 32, 32);         # crypto_hash_sha512_update(&hs, m, mlen);         # crypto_hash_sha512_final(&hs, nonce);         $hs = hash_init('sha512');
        self::hash_update($hs, self::substr($az, 32, 32));
        self::hash_update($hs, $message);
        $nonceHash = hash_final($hs, true);

        # memmove(sig + 32, sk + 32, 32);         $pk = self::substr($sk, 32, 32);

        # sc_reduce(nonce);         # ge_scalarmult_base(&R, nonce);         # ge_p3_tobytes(sig, &R);         $nonce = self::sc_reduce($nonceHash) . self::substr($nonceHash, 32);
        $sig = self::ge_p3_tobytes(
            self::ge_scalarmult_base($nonce)
        );

$value = $this->propertyAccessor->getValue($user, $property) ?? '';
            if ($value instanceof \DateTimeInterface) {
                $value = $value->format('c');
            }

            if (!\is_scalar($value) && !$value instanceof \Stringable) {
                throw new \InvalidArgumentException(sprintf('The property path "%s" on the user object "%s" must return a value that can be cast to a string, but "%s" was returned.', $property, $user::class, get_debug_type($value)));
            }
            hash_update($fieldsHash, ':'.base64_encode($value));
        }

        $fieldsHash = strtr(base64_encode(hash_final($fieldsHash, true)), '+/=', '-_~');

        return $this->generateHash($fieldsHash.':'.$expires.':'.$userIdentifier).$fieldsHash;
    }

    private function generateHash(string $tokenValue): string
    {
        return strtr(base64_encode(hash_hmac('sha256', $tokenValue, $this->secret, true)), '+/=', '-_~');
    }
}

    }

    private function computeHash(): string
    {
        $hash = hash_init('xxh128');

        foreach ($this->getIterator() as $path => $info) {
            hash_update($hash, $path."\n");
        }

        return hash_final($hash);
    }

    private function expandGlob(string $pattern): array
    {
        $segments = preg_split('/\{([^{}]*+)\}/', $pattern, -1, \PREG_SPLIT_DELIM_CAPTURE);
        $paths = [$segments[0]];
        $patterns = [];

        for ($i = 1; $i < \count($segments); $i += 2) {
            $patterns = [];

$pos = $stream->tell();

        if ($pos > 0) {
            $stream->rewind();
        }

        $ctx = hash_init($algo);
        while (!$stream->eof()) {
            hash_update($ctx, $stream->read(1048576));
        }

        $out = hash_final($ctx, $rawOutput);
        $stream->seek($pos);

        return $out;
    }

    /** * Clone and modify a request with the given changes. * * This method is useful for reducing the number of clones needed to mutate * a message. * * The changes can be one of: * - method: (string) Changes the HTTP method. * - set_headers: (array) Sets the given headers. * - remove_headers: (array) Remove the given headers. * - body: (mixed) Sets the given body. * - uri: (UriInterface) Set the URI. * - query: (string) Set the query string value of the URI. * - version: (string) Set the protocol version. * * @param RequestInterface $request Request to clone and modify. * @param array $changes Changes to apply. */

$size = $end - $offset;

        $fp = fopen($file, 'rb');
        fseek($fp, $offset);
        $ctx = hash_init($algorithm);
        while ($size > 0) {
            $buffer = fread($fp, min($size, getID3::FREAD_BUFFER_SIZE));
            hash_update($ctx, $buffer);
            $size -= getID3::FREAD_BUFFER_SIZE;
        }
        $hash = hash_final($ctx);
        fclose($fp);

        return $hash;
    }

    /** * @param string $filename_source * @param string $filename_dest * @param int $offset * @param int $length * * @return bool * @throws Exception * * @deprecated Unused, may be removed in future versions of getID3 */

$az = hash('sha512', self::substr($secretKey, 0, 32), true);

        $az[0] = self::intToChr(self::chrToInt($az[0]) & 248);
        $az[31] = self::intToChr((self::chrToInt($az[31]) & 63) | 64);

        $hs = hash_init('sha512');
        self::hash_update($hs, self::substr($az, 32, 32));
        /** @var resource $hs */
        $hs = self::updateHashWithFile($hs, $fp, $size);

        /** @var string $nonceHash */
        $nonceHash = hash_final($hs, true);

        /** @var string $pk */
        $pk = self::substr($secretKey, 32, 32);

        /** @var string $nonce */
        $nonce = ParagonIE_Sodium_Core_Ed25519::sc_reduce($nonceHash) . self::substr($nonceHash, 32);

        /** @var string $sig */
        $sig = ParagonIE_Sodium_Core_Ed25519::ge_p3_tobytes(
            ParagonIE_Sodium_Core_Ed25519::ge_scalarmult_base($nonce)
        );