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<?php |
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declare(strict_types = 1); |
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namespace Sop\CryptoEncoding; |
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/** |
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* Implements PEM file encoding and decoding. |
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* |
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* @link https://tools.ietf.org/html/rfc7468 |
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*/ |
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class PEM |
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{ |
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// well-known PEM types |
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const TYPE_CERTIFICATE = "CERTIFICATE"; |
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const TYPE_CRL = "X509 CRL"; |
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const TYPE_CERTIFICATE_REQUEST = "CERTIFICATE REQUEST"; |
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const TYPE_ATTRIBUTE_CERTIFICATE = "ATTRIBUTE CERTIFICATE"; |
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const TYPE_PRIVATE_KEY = "PRIVATE KEY"; |
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const TYPE_PUBLIC_KEY = "PUBLIC KEY"; |
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const TYPE_ENCRYPTED_PRIVATE_KEY = "ENCRYPTED PRIVATE KEY"; |
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const TYPE_RSA_PRIVATE_KEY = "RSA PRIVATE KEY"; |
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const TYPE_RSA_PUBLIC_KEY = "RSA PUBLIC KEY"; |
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const TYPE_EC_PRIVATE_KEY = "EC PRIVATE KEY"; |
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const TYPE_PKCS7 = "PKCS7"; |
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const TYPE_CMS = "CMS"; |
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/** |
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* Regular expression to match PEM block. |
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* |
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* @var string |
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*/ |
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const PEM_REGEX = /* @formatter:off */ '/' . |
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/* line start */ '(?:^|[\r\n])' . |
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/* header */ '-----BEGIN (.+?)-----[\r\n]+' . |
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/* payload */ '(.+?)' . |
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/* trailer */ '[\r\n]+-----END \\1-----' . |
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'/ms'; /* @formatter:on */ |
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/** |
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* Content type. |
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* |
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* @var string $_type |
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*/ |
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protected $_type; |
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/** |
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* Payload. |
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* |
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* @var string $_data |
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*/ |
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protected $_data; |
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/** |
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* Constructor. |
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* |
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* @param string $type Content type |
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* @param string $data Payload |
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*/ |
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public function __construct(string $type, string $data) |
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{ |
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$this->_type = $type; |
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$this->_data = $data; |
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} |
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/** |
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* Initialize from a PEM-formatted string. |
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* |
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* @param string $str |
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* @throws \UnexpectedValueException If string is not valid PEM |
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* @return self |
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*/ |
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public static function fromString(string $str): self |
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{ |
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if (!preg_match(self::PEM_REGEX, $str, $match)) { |
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throw new \UnexpectedValueException("Not a PEM formatted string."); |
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} |
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$payload = preg_replace('/\s+/', "", $match[2]); |
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$data = base64_decode($payload, true); |
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if (false === $data) { |
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throw new \UnexpectedValueException("Failed to decode PEM data."); |
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} |
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return new self($match[1], $data); |
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} |
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/** |
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* Initialize from a file. |
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* |
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* @param string $filename Path to file |
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* @throws \RuntimeException If file reading fails |
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* @return self |
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*/ |
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public static function fromFile(string $filename): self |
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{ |
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if (!is_readable($filename) || |
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false === ($str = file_get_contents($filename))) { |
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throw new \RuntimeException("Failed to read $filename."); |
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} |
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return self::fromString($str); |
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} |
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/** |
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* Get content type. |
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* |
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* @return string |
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*/ |
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public function type(): string |
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{ |
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return $this->_type; |
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} |
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/** |
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* Get payload. |
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* |
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* @return string |
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*/ |
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public function data(): string |
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{ |
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return $this->_data; |
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} |
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/** |
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* Encode to PEM string. |
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* |
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* @return string |
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*/ |
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public function string(): string |
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{ |
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return "-----BEGIN {$this->_type}-----\n" . |
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trim(chunk_split(base64_encode($this->_data), 64, "\n")) . "\n" . |
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"-----END {$this->_type}-----"; |
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} |
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/** |
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* |
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* @return string |
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*/ |
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public function __toString() |
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{ |
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return $this->string(); |
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} |
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} |
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sop /
crypto-encoding
