hash_update - PHP code example

The php Function Hash_Update

php function hash_update is designed to complement various hashing algorithms like md5() and sha(). It takes a string input and duplicates it using one of the aforementioned algorithms, producing the corresponding output which is then mixed with the data you want to hash. The hash_update() function will also work with functions like hash_equals(), hash_update_stream() and hash_final().

The unauthorized access of sensitive data can damage the application. This can be avoided by applying proper encryption to the data stored in the database. Password hashing is an easy way to do this. Unlike passwords which contain a sequence of characters, hashing converts these strings into fixed-length values which are difficult to reverse.

There are several functions available to encrypt data in php. Some of them are crypt(), md5() and sha1(). crypt() encrypts a string with the standard Unix DES-based encryption algorithm. md5() generates the MD5 message-digest algorithm and sha1() generates the SHA-1 hash of a string.

Another function that encrypts data in php is hash(). It takes two arguments: the first is a string value and the second is optional and can be set to a Boolean value. If the optional value is not set, it will return a lowercase hex string of 40 characters while if it is set to TRUE, it will return raw binary data.

There are also several new PHP 8.1 features to improve application performance. The fsync() and fdatasync() functions are similar to fflush() in that they flush the buffer to physical storage. However, the main difference is that fsync() and

hash_update example

private function computeHash(): string
    {
        try {
            $this->classReflector ??= new \ReflectionClass($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];
        }

$canon .= ' ';
                            $isSpaceSequence = false;
                        }
                        $currentLine .= $chunk[$i];
                        $canon .= $chunk[$i];
                }
            }

            if ($length + \strlen($canon) >= $maxLength) {
                $canon = substr($canon, 0, $maxLength - $length);
                $length += \strlen($canon);
                hash_update($hash, $canon);

                break;
            }

            $length += \strlen($canon);
            hash_update($hash, $canon);
        }

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

# az[0] &= 248;         # az[31] &= 63;         # 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(

$fieldsHash = hash_init('sha256');

        foreach ($this->signatureProperties as $property) {
            $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)), '+/=', '-_~');
    }
}

    protected static function h2c_string_to_hash_sha256($hLen, $ctx, $msg)
    {
        $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);

# az[0] &= 248;         # az[31] &= 63;         # 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(

if (!is_resource($fp)) {
            throw new SodiumException('Could not open input file for reading');
        }

        /** @var string $az */
        $az = hash('sha512', self::substr($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);

            ->sortByName()
            ->in($prefix)
        ;
    }

    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 = [];

    public static function hash(StreamInterface $stream, string $algo, bool $rawOutput = false): string
    {
        $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. */

/** * Catch hash_update() failures and throw instead of silently proceeding * * @param HashContext|resource &$hs * @param string $data * @return void * @throws SodiumException * @psalm-suppress PossiblyInvalidArgument */
    protected static function hash_update(&$hs, $data)
    {
        if (!hash_update($hs, $data)) {
            throw new SodiumException('hash_update() failed');
        }
    }

    /** * Convert a hexadecimal string into a binary string without cache-timing * leaks * * @internal You should not use this directly from another application * * @param string $hexString * @param string $ignore * @param bool $strictPadding * @return string (raw binary) * @throws RangeException * @throws TypeError */

if (!in_array($algorithm, array('md5', 'sha1'))) {
            throw new getid3_exception('Invalid algorithm ('.$algorithm.') in self::hash_data()');
        }

        $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 */