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<?php namespace Aws\Crypto\Cipher; use Aws\Exception\CryptoException; trait CipherBuilderTrait { /** * Returns an identifier recognizable by `openssl_*` functions, such as * `aes-256-cbc` or `aes-128-ctr`. * * @param string $cipherName Name of the cipher being used for encrypting * or decrypting. * @param int $keySize Size of the encryption key, in bits, that will be * used. * * @return string */ protected function getCipherOpenSslName($cipherName, $keySize) { return "aes-{$keySize}-{$cipherName}"; } /** * Constructs a CipherMethod for the given name, initialized with the other * data passed for use in encrypting or decrypting. * * @param string $cipherName Name of the cipher to generate for encrypting. * @param string $iv Base Initialization Vector for the cipher. * @param int $keySize Size of the encryption key, in bits, that will be * used. * * @return CipherMethod * * @internal */ protected function buildCipherMethod($cipherName, $iv, $keySize) { switch ($cipherName) { case 'cbc': return new Cbc( $iv, $keySize ); default: return null; } } /** * Performs a reverse lookup to get the openssl_* cipher name from the * AESName passed in from the MetadataEnvelope. * * @param $aesName * * @return string * * @internal */ protected function getCipherFromAesName($aesName) { switch ($aesName) { case 'AES/GCM/NoPadding': return 'gcm'; case 'AES/CBC/PKCS5Padding': return 'cbc'; default: throw new CryptoException('Unrecognized or unsupported' . ' AESName for reverse lookup.'); } } }