media-cloud-sync / includes / sdk / s3 / Aws / Crypto / Cipher / CipherBuilderTrait.php

CipherBuilderTrait.php in Media Cloud Sync 1.2.2, at includes/sdk/s3/Aws/Crypto/Cipher/CipherBuilderTrait.php

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1	<?php
2
3	namespace Dudlewebs\WPMCS\s3\Aws\Crypto\Cipher;
4
5	use Dudlewebs\WPMCS\s3\Aws\Exception\CryptoException;
6	trait CipherBuilderTrait
7	{
8	/**
9	* Returns an identifier recognizable by `openssl_*` functions, such as
10	* `aes-256-cbc` or `aes-128-ctr`.
11	*
12	* @param string $cipherName Name of the cipher being used for encrypting
13	* or decrypting.
14	* @param int $keySize Size of the encryption key, in bits, that will be
15	* used.
16	*
17	* @return string
18	*/
19	protected function getCipherOpenSslName($cipherName, $keySize)
20	{
21	return "aes-{$keySize}-{$cipherName}";
22	}
23	/**
24	* Constructs a CipherMethod for the given name, initialized with the other
25	* data passed for use in encrypting or decrypting.
26	*
27	* @param string $cipherName Name of the cipher to generate for encrypting.
28	* @param string $iv Base Initialization Vector for the cipher.
29	* @param int $keySize Size of the encryption key, in bits, that will be
30	* used.
31	*
32	* @return CipherMethod
33	*
34	* @internal
35	*/
36	protected function buildCipherMethod($cipherName, $iv, $keySize)
37	{
38	switch ($cipherName) {
39	case 'cbc':
40	return new Cbc($iv, $keySize);
41	default:
42	return null;
43	}
44	}
45	/**
46	* Performs a reverse lookup to get the openssl_* cipher name from the
47	* AESName passed in from the MetadataEnvelope.
48	*
49	* @param $aesName
50	*
51	* @return string
52	*
53	* @internal
54	*/
55	protected function getCipherFromAesName($aesName)
56	{
57	switch ($aesName) {
58	case 'AES/GCM/NoPadding':
59	return 'gcm';
60	case 'AES/CBC/PKCS5Padding':
61	return 'cbc';
62	default:
63	throw new CryptoException('Unrecognized or unsupported' . ' AESName for reverse lookup.');
64	}
65	}
66	}
67