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<?php |
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/** |
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* Trait implementation of the cipher/encryption data output formats for encryption algorithms. |
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*/ |
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namespace CryptoManana\Core\Traits\MessageEncryption; |
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use \CryptoManana\Core\Interfaces\MessageEncryption\CipherDataFormatsInterface as CipherDataFormatsSpecification; |
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use \CryptoManana\Core\StringBuilder as StringBuilder; |
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/** |
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* Trait CipherDataFormatsTrait - Reusable implementation of `CipherDataFormatsInterface`. |
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* |
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* @see \CryptoManana\Core\Interfaces\MessageDigestion\CipherDataFormatsInterface The abstract specification. |
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* |
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* @package CryptoManana\Core\Traits\MessageEncryption |
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* |
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* @property int $cipherFormat The output cipher format property storage. |
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* |
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* @mixin CipherDataFormatsSpecification |
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*/ |
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trait CipherDataFormatsTrait |
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{ |
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/** |
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* Internal method for converting the output format representation via the chosen format. |
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* |
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* @param string $bytes The bytes for conversion. |
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* @param bool|int|null $direction Flag for encryption direction (encrypt => `true` or decrypt => `false`). |
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* |
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* @return string The formatted bytes. |
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*/ |
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protected function changeOutputFormat($bytes, $direction = true) |
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{ |
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if ($this->cipherFormat === self::ENCRYPTION_OUTPUT_RAW) { |
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return $bytes; |
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} |
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if ($direction == true) { |
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switch ($this->cipherFormat) { |
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case self::ENCRYPTION_OUTPUT_HEX_LOWER: |
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$bytes = bin2hex($bytes); |
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break; |
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case self::ENCRYPTION_OUTPUT_HEX_UPPER: |
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$bytes = StringBuilder::stringToUpper(bin2hex($bytes)); |
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break; |
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case self::ENCRYPTION_OUTPUT_BASE_64: |
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$bytes = base64_encode($bytes); |
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break; |
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case self::ENCRYPTION_OUTPUT_BASE_64_URL: |
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default: |
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$bytes = base64_encode($bytes); |
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$bytes = StringBuilder::stringReplace(['+', '/', '='], ['-', '_', ''], $bytes); |
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break; |
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} |
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} else { |
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$hexCasePattern = '/^[a-f0-9]+$/'; |
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$base64Pattern = '%^[a-zA-Z0-9/+]*={0,2}$%'; |
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$base64UrlFriendlyPattern = '/^[a-zA-Z0-9_-]+$/'; |
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switch ($this->cipherFormat) { |
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case self::ENCRYPTION_OUTPUT_HEX_LOWER: |
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case self::ENCRYPTION_OUTPUT_HEX_UPPER: |
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if (preg_match($hexCasePattern, StringBuilder::stringToLower($bytes))) { |
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$bytes = hex2bin(StringBuilder::stringToLower($bytes)); |
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} |
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break; |
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case self::ENCRYPTION_OUTPUT_BASE_64: |
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if (preg_match($base64Pattern, $bytes) && StringBuilder::stringLength($bytes) % 4 === 0) { |
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$bytes = base64_decode($bytes); |
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} |
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break; |
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case self::ENCRYPTION_OUTPUT_BASE_64_URL: |
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default: |
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if (preg_match($base64UrlFriendlyPattern, $bytes)) { |
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$bytes = StringBuilder::stringReplace(['-', '_'], ['+', '/'], $bytes); |
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$times = StringBuilder::stringLength($bytes) % 4; |
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// Instead of str_pad for encoding friendly appending |
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for ($i = 0; $i < $times; $i++) { |
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$bytes .= '='; |
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} |
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$bytes = base64_decode($bytes); |
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} |
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break; |
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} |
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} |
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return $bytes; |
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} |
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/** |
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* Setter for the output cipher format code property. |
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* |
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* @param int $cipherFormat The output cipher format code. |
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* |
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* @return $this The encryption algorithm object. |
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* @throws \Exception Validation errors. |
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*/ |
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public function setCipherFormat($cipherFormat) |
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{ |
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$cipherFormat = filter_var( |
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$cipherFormat, |
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FILTER_VALIDATE_INT, |
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[ |
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"options" => [ |
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"min_range" => self::ENCRYPTION_OUTPUT_RAW, |
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"max_range" => self::ENCRYPTION_OUTPUT_BASE_64_URL, |
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], |
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] |
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); |
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if ($cipherFormat === false) { |
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throw new \InvalidArgumentException( |
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'The output format mode must be an integer between ' . |
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self::ENCRYPTION_OUTPUT_RAW . ' and ' . self::ENCRYPTION_OUTPUT_BASE_64_URL . '.' |
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); |
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} |
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$this->cipherFormat = $cipherFormat; |
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return $this; |
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} |
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/** |
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* Getter for the output cipher format code property. |
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* |
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* @return int The output cipher format code. |
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*/ |
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public function getCipherFormat() |
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{ |
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return $this->cipherFormat; |
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} |
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} |
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TonyKaravasilev /
CryptoManana
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