EncryptHelper::getAutomaticDecryption() - Code Metrics - Inspection of "improve performance + tips" - lekoala/silverstripe-encrypt - Measure and Improve Code Quality continuously with Scrutinizer

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Push — master ( 5a9348...48ccd3 )

by Thomas

created 2021-12-10 21:04 UTC

EncryptHelper::getAutomaticDecryption() A

↳ Parent: EncryptHelper

Complexity

Conditions	1
Paths	1

Size

Total Lines	3
Code Lines	1

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
eloc	1
c	0
b	0
f	0
dl	0
loc	3
rs	10
cc	1
nc	1
nop	0

<?php

namespace LeKoala\Encrypt;

use Exception;
use InvalidArgumentException;
use SilverStripe\Assets\File;
use ParagonIE\ConstantTime\Hex;
use SilverStripe\Core\ClassInfo;
use SilverStripe\ORM\DataObject;
use SilverStripe\Control\Director;
use SilverStripe\Core\Environment;
use ParagonIE\CipherSweet\CipherSweet;
use SilverStripe\ORM\FieldType\DBText;
use ParagonIE\CipherSweet\EncryptedFile;
.
|-- OtherDir
|   |-- Bar.php
|   `-- Foo.php
`-- SomeDir
    `-- Foo.php
use SilverStripe\ORM\FieldType\DBVarchar;
use SilverStripe\Core\Config\Configurable;
use SilverStripe\ORM\FieldType\DBHTMLText;
use SilverStripe\ORM\FieldType\DBComposite;
use ParagonIE\CipherSweet\Backend\FIPSCrypto;
use ParagonIE\CipherSweet\Backend\BoringCrypto;
use ParagonIE\CipherSweet\Backend\ModernCrypto;
use ParagonIE\CipherSweet\Contract\BackendInterface;
use ParagonIE\CipherSweet\Planner\FieldIndexPlanner;
use ParagonIE\CipherSweet\KeyProvider\StringProvider;
use ParagonIE\CipherSweet\Contract\KeyProviderInterface;
use SilverStripe\ORM\DB;

/**
 * @link https://ciphersweet.paragonie.com/php
 * @link https://paragonie.com/blog/2017/05/building-searchable-encrypted-databases-with-php-and-sql
 * @link https://paragonie.com/book/pecl-libsodium/read/09-recipes.md
 */
class EncryptHelper
{
    use Configurable;

    const DEFAULT_OUTPUT_SIZE = 15;
    const DEFAULT_DOMAIN_SIZE = 127;
    const BORING = "brng";
    const MODERN = "nacl";
    const FIPS = "fips";

    /**
     * @config
     * @var string
     */
    private static $forced_encryption = null;

    /**
     * @config
     * @var bool
     */
    private static $automatic_rotation = true;

    /**
     * @var boolean
     */
    private static $automatic_decryption = true;

    /**
     * @var string
     */
    private static $aad_source = "ID";

    /**
     * @var CipherSweet
     */
    protected static $ciphersweet;

    /**
     * @var EncryptedFile
     */
    protected static $encryptedFile;

    /**
     * @var array
     */
    protected static $field_cache = [];

    /**
     * @return string
     */
    public static function getForcedEncryption()
    {
        return self::config()->forced_encryption;
    }

    /**
     * @param string $forcedEncryption brng|nacl|fips
     * @return void
     */
    public static function setForcedEncryption($forcedEncryption)
    {
        if ($forcedEncryption && !in_array($forcedEncryption, ["brng", "nacl", "fips"])) {
            throw new InvalidArgumentException("$forcedEncryption is not supported");
        }
        self::config()->forced_encryption = $forcedEncryption;
    }

    /**
     * This would only work if you changed from algorithm
     * @return bool
     */
    public static function getAutomaticRotation()
    {
        return self::config()->automatic_rotation;
    }

    /**
     * @param bool $setAutomaticRotation
     * @return void
     */
    public static function setAutomaticRotation($automaticRotation)
    {
        self::config()->automatic_rotation = $automaticRotation;
    }

    /**
     * @return bool
     */
    public static function getAutomaticDecryption()
    {
        return self::config()->automatic_decryption;
    }

    /**
     * @param bool $automaticDecryption
     * @return void
     */
    public static function setAutomaticDecryption($automaticDecryption)
    {
        self::config()->automatic_decryption = $automaticDecryption;
    }

    /**
     * @return string
     */
    public static function getAadSource()
    {
        return self::config()->aad_source;
    }

    /**
     * @param bool $aadSource
     * @return void
     */
    public static function setAadSource($aadSource)
    {
        self::config()->aad_source = $aadSource;
    }

    /**
     * @link https://ciphersweet.paragonie.com/php/blind-index-planning
     * @return array
     */
    public static function planIndexSizes()
    {
        $dataObjects = ClassInfo::subclassesFor(DataObject::class);
        $indexes = [];
        foreach ($dataObjects as $dataObject) {
            if (!class_uses(HasEncryptedFields::class)) {
                continue;
            }
            $index[$dataObject] = self::planIndexSizesForClass($dataObject);
        }
        return $indexes;
    }

    /**
     * @param string $dataObject
     * @return array
     */
    public static function planIndexSizesForClass($class)
    {
        $sng = singleton($class);
        $encryptedFields = self::getEncryptedFields($class);
        // By default, plan for a large number of rows
        $estimatedPopulation = $class::config()->estimated_population ?? PHP_INT_MAX;
        $planner = new FieldIndexPlanner();
        $planner->setEstimatedPopulation($estimatedPopulation);
        $indexes = [];
        foreach ($encryptedFields as $encryptedField => $encryptedClass) {
            if (!is_subclass_of($encryptedClass, DBComposite::class)) {
                continue;
            }
            $dbObject = $sng->dbObject($encryptedField);
            $outputSize = $dbObject->getOutputSize() ?? self::DEFAULT_OUTPUT_SIZE;
            $domainSize = $dbObject->getDomainSize() ?? self::DEFAULT_DOMAIN_SIZE;
            $planner->addExistingIndex($encryptedField . "BlindIndex", $outputSize, $domainSize);
            // The smaller of the two values will be used to compute coincidences
            $indexes[] = ["L" => $outputSize, "K" => $domainSize];
        }
        $coincidenceCount = round(self::coincidenceCount($indexes, $estimatedPopulation));
        $recommended = $planner->recommend();
        $recommended['indexes'] = count($indexes);
        // If there is no coincidence, it means the index is not safe for use because it means
        // that two identical plaintexts will give the same output
        $recommended['coincidence_count'] = $coincidenceCount;
        $recommended['coincidence_ratio'] = $coincidenceCount / $estimatedPopulation * 100;
        $recommended['estimated_population'] = $estimatedPopulation;
        return $recommended;
    }

    /**
     * @deprecated
     * @link https://github.com/paragonie/ciphersweet/issues/62
     * @param array $ciphertext
     * @return array
     */
    public static function removeNulls($ciphertext)
    {
        foreach ($ciphertext as $k => $v) {
            if ($v === null) {
                $ciphertext[$k] = '';
            }
        }
        return $ciphertext;
    }

    /**
     * Attempting to pass a key of an invalid size (i.e. not 256-bit) will result in a CryptoOperationException being thrown.
     * The recommended way to generate a key is to use this method
     *
     * @return string A 64 chars string like 4e1c44f87b4cdf21808762970b356891db180a9dd9850e7baf2a79ff3ab8a2fc
     */
    public static function generateKey()
    {
        return Hex::encode(random_bytes(32));
    }

    /**
     * @return array Two 64 chars strings
     */
    public static function generateKeyPair()
    {
        $key_pair = sodium_crypto_box_keypair();
        $public_key = sodium_crypto_box_publickey($key_pair);
        $private_key = sodium_crypto_box_secretkey($key_pair);

        return [
            'public_key' => Hex::encode($public_key),
            'private_key' => Hex::encode($private_key),
        ];
    }

    /**
     * Get app encryption key
     * Encryption key should be provided in your $_ENV or .env file
     *
     * @return string
     */
    public static function getKey()
    {
        // Try our path variable
        $keyPath = Environment::getEnv('ENCRYPTION_KEY_PATH');
        $key = null;
        if ($keyPath) {
            $key = file_get_contents($keyPath);
            if (!$key || !is_string($key)) {
                throw new Exception("Could not read key from $keyPath");
            }
        }
        // Try regular env key
        if (!$key) {
            $key = Environment::getEnv('ENCRYPTION_KEY');
        }
        if (!$key) {
            $key = self::generateKey();
            if (Director::isDev()) {
                $envFile = rtrim(Director::baseFolder(), '/') . "/.env";
                if (is_file($envFile) && is_writable($envFile)) {
                    file_put_contents($envFile, 'ENCRYPTION_KEY="' . $key . '"', FILE_APPEND);
                    return $key;
                }
            }
            throw new Exception("Please define an ENCRYPTION_KEY in your environment. You can use this one: $key");
        }
        return $key;
    }

    /**
     * @return string
     */
    public static function getOldKey()
    {
        return Environment::getEnv('OLD_ENCRYPTION_KEY');
    }

    /**
     * @param string $key
     * @return StringProvider
     */
    public static function getProviderWithKey($key = null)
    {
        if ($key === null) {
            $key = self::getKey();
        }
        return new StringProvider($key);
    }

    /**
     * @return BackendInterface
     */
    public static function getRecommendedBackend()
    {
        if (version_compare(phpversion(), '7.2', '<')) {
            return new FIPSCrypto();
        }
        return new BoringCrypto();
    }

    /**
     * @param string $encryption
     * @return BackendInterface
     */
    public static function getBackendForEncryption($encryption = null)
    {
        if (!$encryption) {
            return self::getRecommendedBackend();
        }
        switch ($encryption) {
            case self::BORING:
                return new BoringCrypto();
            case self::MODERN:
                return new ModernCrypto();
            case self::FIPS:
                return new FIPSCrypto();
        }
        throw new Exception("Unsupported encryption $encryption");
    }

    /**
     * @param BackendInterface $backend
     * @param string $key
     * @return CipherSweet
     */
    public static function getEngineForEncryption($encryption = null, $key = null)
    {
        return self::getEngine(self::getBackendForEncryption($encryption), $key);
    }

    /**
     * @param BackendInterface $backend
     * @param string $key
     * @return CipherSweet
     */
    public static function getEngine(BackendInterface $backend, $key = null)
    {
        $provider = self::getProviderWithKey($key);
        return new CipherSweet($provider, $backend);
    }

    /**
     * @param BackendInterface $backend
     * @param KeyProviderInterface $provider
     * @return CipherSweet
     */
    public static function getEngineWithProvider(BackendInterface $backend, KeyProviderInterface $provider)
    {
        return new CipherSweet($provider, $backend);
    }

    /**
     * @return EncryptedFile
     */
    public static function getEncryptedFileInstance()
    {
        if (!self::$encryptedFile) {
            self::$encryptedFile = new EncryptedFile(self::getCipherSweet());
        }
        return self::$encryptedFile;
    }

    /**
     * @param int $ID
     * @return bool
     */
    public static function checkIfFileIsEncrypted($ID)
    {
        return (bool)DB::prepared_query("SELECT Encrypted FROM File WHERE ID = ?", [$ID]);
    }

    /**
     * @param KeyProviderInterface $provider
     * @return CipherSweet
     */
    public static function getCipherSweet($provider = null)
    {
        if (self::$ciphersweet) {
            return self::$ciphersweet;
        }
        if ($provider === null) {
            $provider = self::getProviderWithKey();
        }
        if (self::getForcedEncryption()) {
            $backend = self::getBackendForEncryption(self::getForcedEncryption());
        } else {
            $backend = self::getRecommendedBackend();
        }
        self::$ciphersweet = new CipherSweet($provider, $backend);
        return self::$ciphersweet;
    }

    /**
     * @return void
     */
    public static function clearCipherSweet()
    {
        self::$ciphersweet = null;
        self::$encryptedFile = null;
    }

    /**
     * @return BackendInterface
     */
    public static function getCipherSweetBackend()
    {
        return self::getCipherSweet()->getBackend();
    }

    /**
     * Check if a value is encrypted
     *
     * @param string $value
     * @return boolean
     */
    public static function isEncrypted($value)
    {
        $prefix = substr($value, 0, 5);
        return in_array($prefix, ["brng:", "nacl:", "fips:"]);
    }

    /**
     * @param string $value
     * @return boolean
     */
    public static function isFips($value)
    {
        if (strpos($value, 'fips:') === 0) {
            return true;
        }
        return false;
    }

    /**
     * @param string $value
     * @return boolean
     */
    public static function isNacl($value)
    {
        if (strpos($value, 'nacl:') === 0) {
            return true;
        }
        return false;
    }

    /**
     * @param string $value
     * @return boolean
     */
    public static function isBoring($value)
    {
        if (strpos($value, 'brng:') === 0) {
            return true;
        }
        return false;
    }

    /**
     * @param string $value
     * @return string
     */
    public static function getEncryption($value)
    {
        if (self::isBoring($value)) {
            return self::BORING;
        }
        if (self::isNacl($value)) {
            return self::MODERN;
        }
        if (self::isFips($value)) {
            return self::FIPS;
        }
        return false;

    }

    /**
     * Check if a field is encrypted on a class
     * This relies on a field class starting with Encrypted
     *
     * @param string $class
     * @param string $field
     * @return boolean
     */
    public static function isEncryptedField($class, $field)
    {
        $key = $class . '_' . $field;
        if (isset(self::$field_cache[$key])) {
            return self::$field_cache[$key];
        }

        $fields = $class::config()->db;

        if (isset($fields[$field])) {
            $dbClass = $fields[$field];
            self::$field_cache[$key] = strpos($dbClass, 'Encrypted') !== false;
        } else {
            self::$field_cache[$key] = false;
        }
        return self::$field_cache[$key];
    }

    /**
     * Filters parameters from database class config
     * @return string
     */
    protected static function filterDbClass($dbClass)
    {
        $pos = strpos($dbClass, '(');
        if ($pos !== false) {
            $dbClass = substr($dbClass, 0, $pos);
        }
        return $dbClass;
    }

    /**
     * @param string $class
     * @param bool $dbFields Return actual database field value instead of field name
     * @return array An associative array with the name of the field as key and the class as value
     */
    public static function getEncryptedFields($class, $dbFields = false)
    {
        $fields = $class::config()->db;
        $list = [];
        foreach ($fields as $field => $dbClass) {
            $dbClass = self::filterDbClass($dbClass);
            $key = $class . '_' . $field;
            if (isset($fields[$field])) {
                self::$field_cache[$key] = strpos($dbClass, 'Encrypted') !== false;
                if (self::$field_cache[$key]) {
                    // Sometimes we need actual db field name
                    if ($dbFields && is_subclass_of($dbClass, DBComposite::class)) {
                        $list[$field . "Value"] = $dbClass;
                    } else {
                        $list[$field] = $dbClass;
                    }
                }
            } else {
                self::$field_cache[$key] = false;
            }
        }
        return $list;
    }

    /**
     * A simple encryption
     * @param string $value
     * @return string
     */
    public static function encrypt($value)
    {
        // Do not encrypt twice
        $encryption = self::getEncryption($value);
        if ($encryption) {
            return $value;
        }
        $provider = self::getProviderWithKey();
        $backend = self::getBackendForEncryption($encryption);
        return $backend->encrypt($value, $provider->getSymmetricKey());
    }

    /**
     * A simple decryption
     * @param string $value
     * @return string
     */
    public static function decrypt($value)
    {
        // Only decrypt what we can decrypt
        $encryption = self::getEncryption($value);
        if (!$encryption) {
            return $value;
        }
        $provider = self::getProviderWithKey();
        $backend =  self::getBackendForEncryption($encryption);
        return $backend->decrypt($value, $provider->getSymmetricKey());
    }

    /**
     * Return a map of fields with their encrypted counterpart
     *
     * @return array
     */
    public static function mapEncryptionDBField()
    {
        return [
            DBHTMLText::class => EncryptedDBHTMLText::class,
            DBText::class => EncryptedDBText::class,
            DBVarchar::class => EncryptedDBVarchar::class,
        ];
    }

    /**
     * Compute Blind Index Information Leaks
     *
     * @link https://ciphersweet.paragonie.com/php/blind-index-planning
     * @link https://ciphersweet.paragonie.com/security
     * @param array $indexes an array of L (output size) / K (domaine size) pairs
     * @param int $R the number of encrypted records that use this blind index
     * @return float
     */
    public static function coincidenceCount(array $indexes, $R)
    {
        $exponent = 0;
        $count = count($indexes);
        for ($i = 0; $i < $count; ++$i) {
            $exponent += min($indexes[$i]['L'], $indexes[$i]['K']);
        }
        return (float) max(1, $R) / pow(2, $exponent);
    }

    /**
     * Alias of sendDecryptedFile
     * @deprecated
     * @param File|EncryptedDBFile $file
     * @return void
     */
    public static function sendEncryptedFile(File $file)
    {
        self::sendDecryptedFile($file);
    }

    /**
     * Send a decrypted file
     *
     * @param File|EncryptedDBFile $file
     * @param string $fileName
     * @param string $mimeType
     * @return void
     */
    public static function sendDecryptedFile(File $file, $fileName = null, $mimeType = null)
    {
        if (!$fileName) {
            $fileName = basename($file->getFilename());
        }
        if (!$mimeType) {
            $mimeType = 'application/octetstream';
        }
        header('Content-disposition: attachment; filename="' . $fileName . '"');
        header('Content-type: ' . $mimeType);
        header('Pragma: no-cache');
        header('Expires: 0');
        $file->sendDecryptedFile();
    }
}


1			<?php
2
3			namespace LeKoala\Encrypt;
4
5			use Exception;
6			use InvalidArgumentException;
7			use SilverStripe\Assets\File;
8			use ParagonIE\ConstantTime\Hex;
9			use SilverStripe\Core\ClassInfo;
10			use SilverStripe\ORM\DataObject;
11			use SilverStripe\Control\Director;
12			use SilverStripe\Core\Environment;
13			use ParagonIE\CipherSweet\CipherSweet;
14			use SilverStripe\ORM\FieldType\DBText;
15			use ParagonIE\CipherSweet\EncryptedFile;
			0 ignored issues – show Bug introduced 2021-12-10 21:07 UTC by Report Bug Copy Issue Report This use statement conflicts with another class in this namespace, `LeKoala\Encrypt\EncryptedFile`. Consider defining an alias. Let?s assume that you have a directory layout like this: . \|-- OtherDir \| \|-- Bar.php \| `-- Foo.php `-- SomeDir `-- Foo.php and let?s assume the following content of `Bar.php`: // Bar.php namespace OtherDir; use SomeDir\Foo; // This now conflicts the class OtherDir\Foo If both files `OtherDir/Foo.php` and `SomeDir/Foo.php` are loaded in the same runtime, you will see a PHP error such as the following: PHP Fatal error: Cannot use SomeDir\Foo as Foo because the name is already in use in OtherDir/Foo.php However, as `OtherDir/Foo.php` does not necessarily have to be loaded and the error is only triggered if it is loaded before `OtherDir/Bar.php`, this problem might go unnoticed for a while. In order to prevent this error from surfacing, you must import the namespace with a different alias: // Bar.php namespace OtherDir; use SomeDir\Foo as SomeDirFoo; // There is no conflict anymore. Loading history...
16			use SilverStripe\ORM\FieldType\DBVarchar;
17			use SilverStripe\Core\Config\Configurable;
18			use SilverStripe\ORM\FieldType\DBHTMLText;
19			use SilverStripe\ORM\FieldType\DBComposite;
20			use ParagonIE\CipherSweet\Backend\FIPSCrypto;
21			use ParagonIE\CipherSweet\Backend\BoringCrypto;
22			use ParagonIE\CipherSweet\Backend\ModernCrypto;
23			use ParagonIE\CipherSweet\Contract\BackendInterface;
24			use ParagonIE\CipherSweet\Planner\FieldIndexPlanner;
25			use ParagonIE\CipherSweet\KeyProvider\StringProvider;
26			use ParagonIE\CipherSweet\Contract\KeyProviderInterface;
27			use SilverStripe\ORM\DB;
28
29			/**
30			* @link https://ciphersweet.paragonie.com/php
31			* @link https://paragonie.com/blog/2017/05/building-searchable-encrypted-databases-with-php-and-sql
32			* @link https://paragonie.com/book/pecl-libsodium/read/09-recipes.md
33			*/
34			class EncryptHelper
35			{
36			use Configurable;
37
38			const DEFAULT_OUTPUT_SIZE = 15;
39			const DEFAULT_DOMAIN_SIZE = 127;
40			const BORING = "brng";
41			const MODERN = "nacl";
42			const FIPS = "fips";
43
44			/**
45			* @config
46			* @var string
47			*/
48			private static $forced_encryption = null;
49
50			/**
51			* @config
52			* @var bool
53			*/
54			private static $automatic_rotation = true;
55
56			/**
57			* @var boolean
58			*/
59			private static $automatic_decryption = true;
60
61			/**
62			* @var string
63			*/
64			private static $aad_source = "ID";
65
66			/**
67			* @var CipherSweet
68			*/
69			protected static $ciphersweet;
70
71			/**
72			* @var EncryptedFile
73			*/
74			protected static $encryptedFile;
75
76			/**
77			* @var array
78			*/
79			protected static $field_cache = [];
80
81			/**
82			* @return string
83			*/
84			public static function getForcedEncryption()
85			{
86			return self::config()->forced_encryption;
87			}
88
89			/**
90			* @param string $forcedEncryption brng\|nacl\|fips
91			* @return void
92			*/
93			public static function setForcedEncryption($forcedEncryption)
94			{
95			if ($forcedEncryption && !in_array($forcedEncryption, ["brng", "nacl", "fips"])) {
96			throw new InvalidArgumentException("$forcedEncryption is not supported");
97			}
98			self::config()->forced_encryption = $forcedEncryption;
99			}
100
101			/**
102			* This would only work if you changed from algorithm
103			* @return bool
104			*/
105			public static function getAutomaticRotation()
106			{
107			return self::config()->automatic_rotation;
108			}
109
110			/**
111			* @param bool $setAutomaticRotation
112			* @return void
113			*/
114			public static function setAutomaticRotation($automaticRotation)
115			{
116			self::config()->automatic_rotation = $automaticRotation;
117			}
118
119			/**
120			* @return bool
121			*/
122			public static function getAutomaticDecryption()
123			{
124			return self::config()->automatic_decryption;
125			}
126
127			/**
128			* @param bool $automaticDecryption
129			* @return void
130			*/
131			public static function setAutomaticDecryption($automaticDecryption)
132			{
133			self::config()->automatic_decryption = $automaticDecryption;
134			}
135
136			/**
137			* @return string
138			*/
139			public static function getAadSource()
140			{
141			return self::config()->aad_source;
142			}
143
144			/**
145			* @param bool $aadSource
146			* @return void
147			*/
148			public static function setAadSource($aadSource)
149			{
150			self::config()->aad_source = $aadSource;
151			}
152
153			/**
154			* @link https://ciphersweet.paragonie.com/php/blind-index-planning
155			* @return array
156			*/
157			public static function planIndexSizes()
158			{
159			$dataObjects = ClassInfo::subclassesFor(DataObject::class);
160			$indexes = [];
161			foreach ($dataObjects as $dataObject) {
162			if (!class_uses(HasEncryptedFields::class)) {
163			continue;
164			}
165			$index[$dataObject] = self::planIndexSizesForClass($dataObject);
166			}
167			return $indexes;
168			}
169
170			/**
171			* @param string $dataObject
172			* @return array
173			*/
174			public static function planIndexSizesForClass($class)
175			{
176			$sng = singleton($class);
177			$encryptedFields = self::getEncryptedFields($class);
178			// By default, plan for a large number of rows
179			$estimatedPopulation = $class::config()->estimated_population ?? PHP_INT_MAX;
180			$planner = new FieldIndexPlanner();
181			$planner->setEstimatedPopulation($estimatedPopulation);
182			$indexes = [];
183			foreach ($encryptedFields as $encryptedField => $encryptedClass) {
184			if (!is_subclass_of($encryptedClass, DBComposite::class)) {
185			continue;
186			}
187			$dbObject = $sng->dbObject($encryptedField);
188			$outputSize = $dbObject->getOutputSize() ?? self::DEFAULT_OUTPUT_SIZE;
189			$domainSize = $dbObject->getDomainSize() ?? self::DEFAULT_DOMAIN_SIZE;
190			$planner->addExistingIndex($encryptedField . "BlindIndex", $outputSize, $domainSize);
191			// The smaller of the two values will be used to compute coincidences
192			$indexes[] = ["L" => $outputSize, "K" => $domainSize];
193			}
194			$coincidenceCount = round(self::coincidenceCount($indexes, $estimatedPopulation));
195			$recommended = $planner->recommend();
196			$recommended['indexes'] = count($indexes);
197			// If there is no coincidence, it means the index is not safe for use because it means
198			// that two identical plaintexts will give the same output
199			$recommended['coincidence_count'] = $coincidenceCount;
200			$recommended['coincidence_ratio'] = $coincidenceCount / $estimatedPopulation * 100;
201			$recommended['estimated_population'] = $estimatedPopulation;
202			return $recommended;
203			}
204
205			/**
206			* @deprecated
207			* @link https://github.com/paragonie/ciphersweet/issues/62
208			* @param array $ciphertext
209			* @return array
210			*/
211			public static function removeNulls($ciphertext)
212			{
213			foreach ($ciphertext as $k => $v) {
214			if ($v === null) {
215			$ciphertext[$k] = '';
216			}
217			}
218			return $ciphertext;
219			}
220
221			/**
222			* Attempting to pass a key of an invalid size (i.e. not 256-bit) will result in a CryptoOperationException being thrown.
223			* The recommended way to generate a key is to use this method
224			*
225			* @return string A 64 chars string like 4e1c44f87b4cdf21808762970b356891db180a9dd9850e7baf2a79ff3ab8a2fc
226			*/
227			public static function generateKey()
228			{
229			return Hex::encode(random_bytes(32));
230			}
231
232			/**
233			* @return array Two 64 chars strings
234			*/
235			public static function generateKeyPair()
236			{
237			$key_pair = sodium_crypto_box_keypair();
238			$public_key = sodium_crypto_box_publickey($key_pair);
239			$private_key = sodium_crypto_box_secretkey($key_pair);
240
241			return [
242			'public_key' => Hex::encode($public_key),
243			'private_key' => Hex::encode($private_key),
244			];
245			}
246
247			/**
248			* Get app encryption key
249			* Encryption key should be provided in your $_ENV or .env file
250			*
251			* @return string
252			*/
253			public static function getKey()
254			{
255			// Try our path variable
256			$keyPath = Environment::getEnv('ENCRYPTION_KEY_PATH');
257			$key = null;
258			if ($keyPath) {
259			$key = file_get_contents($keyPath);
260			if (!$key \|\| !is_string($key)) {
261			throw new Exception("Could not read key from $keyPath");
262			}
263			}
264			// Try regular env key
265			if (!$key) {
266			$key = Environment::getEnv('ENCRYPTION_KEY');
267			}
268			if (!$key) {
269			$key = self::generateKey();
270			if (Director::isDev()) {
271			$envFile = rtrim(Director::baseFolder(), '/') . "/.env";
272			if (is_file($envFile) && is_writable($envFile)) {
273			file_put_contents($envFile, 'ENCRYPTION_KEY="' . $key . '"', FILE_APPEND);
274			return $key;
275			}
276			}
277			throw new Exception("Please define an ENCRYPTION_KEY in your environment. You can use this one: $key");
278			}
279			return $key;
280			}
281
282			/**
283			* @return string
284			*/
285			public static function getOldKey()
286			{
287			return Environment::getEnv('OLD_ENCRYPTION_KEY');
288			}
289
290			/**
291			* @param string $key
292			* @return StringProvider
293			*/
294			public static function getProviderWithKey($key = null)
295			{
296			if ($key === null) {
297			$key = self::getKey();
298			}
299			return new StringProvider($key);
300			}
301
302			/**
303			* @return BackendInterface
304			*/
305			public static function getRecommendedBackend()
306			{
307			if (version_compare(phpversion(), '7.2', '<')) {
308			return new FIPSCrypto();
309			}
310			return new BoringCrypto();
311			}
312
313			/**
314			* @param string $encryption
315			* @return BackendInterface
316			*/
317			public static function getBackendForEncryption($encryption = null)
318			{
319			if (!$encryption) {
320			return self::getRecommendedBackend();
321			}
322			switch ($encryption) {
323			case self::BORING:
324			return new BoringCrypto();
325			case self::MODERN:
326			return new ModernCrypto();
327			case self::FIPS:
328			return new FIPSCrypto();
329			}
330			throw new Exception("Unsupported encryption $encryption");
331			}
332
333			/**
334			* @param BackendInterface $backend
335			* @param string $key
336			* @return CipherSweet
337			*/
338			public static function getEngineForEncryption($encryption = null, $key = null)
339			{
340			return self::getEngine(self::getBackendForEncryption($encryption), $key);
341			}
342
343			/**
344			* @param BackendInterface $backend
345			* @param string $key
346			* @return CipherSweet
347			*/
348			public static function getEngine(BackendInterface $backend, $key = null)
349			{
350			$provider = self::getProviderWithKey($key);
351			return new CipherSweet($provider, $backend);
352			}
353
354			/**
355			* @param BackendInterface $backend
356			* @param KeyProviderInterface $provider
357			* @return CipherSweet
358			*/
359			public static function getEngineWithProvider(BackendInterface $backend, KeyProviderInterface $provider)
360			{
361			return new CipherSweet($provider, $backend);
362			}
363
364			/**
365			* @return EncryptedFile
366			*/
367			public static function getEncryptedFileInstance()
368			{
369			if (!self::$encryptedFile) {
370			self::$encryptedFile = new EncryptedFile(self::getCipherSweet());
371			}
372			return self::$encryptedFile;
373			}
374
375			/**
376			* @param int $ID
377			* @return bool
378			*/
379			public static function checkIfFileIsEncrypted($ID)
380			{
381			return (bool)DB::prepared_query("SELECT Encrypted FROM File WHERE ID = ?", [$ID]);
382			}
383
384			/**
385			* @param KeyProviderInterface $provider
386			* @return CipherSweet
387			*/
388			public static function getCipherSweet($provider = null)
389			{
390			if (self::$ciphersweet) {
391			return self::$ciphersweet;
392			}
393			if ($provider === null) {
394			$provider = self::getProviderWithKey();
395			}
396			if (self::getForcedEncryption()) {
397			$backend = self::getBackendForEncryption(self::getForcedEncryption());
398			} else {
399			$backend = self::getRecommendedBackend();
400			}
401			self::$ciphersweet = new CipherSweet($provider, $backend);
402			return self::$ciphersweet;
403			}
404
405			/**
406			* @return void
407			*/
408			public static function clearCipherSweet()
409			{
410			self::$ciphersweet = null;
411			self::$encryptedFile = null;
412			}
413
414			/**
415			* @return BackendInterface
416			*/
417			public static function getCipherSweetBackend()
418			{
419			return self::getCipherSweet()->getBackend();
420			}
421
422			/**
423			* Check if a value is encrypted
424			*
425			* @param string $value
426			* @return boolean
427			*/
428			public static function isEncrypted($value)
429			{
430			$prefix = substr($value, 0, 5);
431			return in_array($prefix, ["brng:", "nacl:", "fips:"]);
432			}
433
434			/**
435			* @param string $value
436			* @return boolean
437			*/
438			public static function isFips($value)
439			{
440			if (strpos($value, 'fips:') === 0) {
441			return true;
442			}
443			return false;
444			}
445
446			/**
447			* @param string $value
448			* @return boolean
449			*/
450			public static function isNacl($value)
451			{
452			if (strpos($value, 'nacl:') === 0) {
453			return true;
454			}
455			return false;
456			}
457
458			/**
459			* @param string $value
460			* @return boolean
461			*/
462			public static function isBoring($value)
463			{
464			if (strpos($value, 'brng:') === 0) {
465			return true;
466			}
467			return false;
468			}
469
470			/**
471			* @param string $value
472			* @return string
473			*/
474			public static function getEncryption($value)
475			{
476			if (self::isBoring($value)) {
477			return self::BORING;
478			}
479			if (self::isNacl($value)) {
480			return self::MODERN;
481			}
482			if (self::isFips($value)) {
483			return self::FIPS;
484			}
485			return false;
			0 ignored issues – show Bug Best Practice introduced 2021-07-02 15:05 UTC by Report Bug Copy Issue Report The expression `return false` returns the type `false` which is incompatible with the documented return type `string`. Loading history...
486			}
487
488			/**
489			* Check if a field is encrypted on a class
490			* This relies on a field class starting with Encrypted
491			*
492			* @param string $class
493			* @param string $field
494			* @return boolean
495			*/
496			public static function isEncryptedField($class, $field)
497			{
498			$key = $class . '_' . $field;
499			if (isset(self::$field_cache[$key])) {
500			return self::$field_cache[$key];
501			}
502
503			$fields = $class::config()->db;
504
505			if (isset($fields[$field])) {
506			$dbClass = $fields[$field];
507			self::$field_cache[$key] = strpos($dbClass, 'Encrypted') !== false;
508			} else {
509			self::$field_cache[$key] = false;
510			}
511			return self::$field_cache[$key];
512			}
513
514			/**
515			* Filters parameters from database class config
516			* @return string
517			*/
518			protected static function filterDbClass($dbClass)
519			{
520			$pos = strpos($dbClass, '(');
521			if ($pos !== false) {
522			$dbClass = substr($dbClass, 0, $pos);
523			}
524			return $dbClass;
525			}
526
527			/**
528			* @param string $class
529			* @param bool $dbFields Return actual database field value instead of field name
530			* @return array An associative array with the name of the field as key and the class as value
531			*/
532			public static function getEncryptedFields($class, $dbFields = false)
533			{
534			$fields = $class::config()->db;
535			$list = [];
536			foreach ($fields as $field => $dbClass) {
537			$dbClass = self::filterDbClass($dbClass);
538			$key = $class . '_' . $field;
539			if (isset($fields[$field])) {
540			self::$field_cache[$key] = strpos($dbClass, 'Encrypted') !== false;
541			if (self::$field_cache[$key]) {
542			// Sometimes we need actual db field name
543			if ($dbFields && is_subclass_of($dbClass, DBComposite::class)) {
544			$list[$field . "Value"] = $dbClass;
545			} else {
546			$list[$field] = $dbClass;
547			}
548			}
549			} else {
550			self::$field_cache[$key] = false;
551			}
552			}
553			return $list;
554			}
555
556			/**
557			* A simple encryption
558			* @param string $value
559			* @return string
560			*/
561			public static function encrypt($value)
562			{
563			// Do not encrypt twice
564			$encryption = self::getEncryption($value);
565			if ($encryption) {
566			return $value;
567			}
568			$provider = self::getProviderWithKey();
569			$backend = self::getBackendForEncryption($encryption);
570			return $backend->encrypt($value, $provider->getSymmetricKey());
571			}
572
573			/**
574			* A simple decryption
575			* @param string $value
576			* @return string
577			*/
578			public static function decrypt($value)
579			{
580			// Only decrypt what we can decrypt
581			$encryption = self::getEncryption($value);
582			if (!$encryption) {
583			return $value;
584			}
585			$provider = self::getProviderWithKey();
586			$backend = self::getBackendForEncryption($encryption);
587			return $backend->decrypt($value, $provider->getSymmetricKey());
588			}
589
590			/**
591			* Return a map of fields with their encrypted counterpart
592			*
593			* @return array
594			*/
595			public static function mapEncryptionDBField()
596			{
597			return [
598			DBHTMLText::class => EncryptedDBHTMLText::class,
599			DBText::class => EncryptedDBText::class,
600			DBVarchar::class => EncryptedDBVarchar::class,
601			];
602			}
603
604			/**
605			* Compute Blind Index Information Leaks
606			*
607			* @link https://ciphersweet.paragonie.com/php/blind-index-planning
608			* @link https://ciphersweet.paragonie.com/security
609			* @param array $indexes an array of L (output size) / K (domaine size) pairs
610			* @param int $R the number of encrypted records that use this blind index
611			* @return float
612			*/
613			public static function coincidenceCount(array $indexes, $R)
614			{
615			$exponent = 0;
616			$count = count($indexes);
617			for ($i = 0; $i < $count; ++$i) {
618			$exponent += min($indexes[$i]['L'], $indexes[$i]['K']);
619			}
620			return (float) max(1, $R) / pow(2, $exponent);
621			}
622
623			/**
624			* Alias of sendDecryptedFile
625			* @deprecated
626			* @param File\|EncryptedDBFile $file
627			* @return void
628			*/
629			public static function sendEncryptedFile(File $file)
630			{
631			self::sendDecryptedFile($file);
632			}
633
634			/**
635			* Send a decrypted file
636			*
637			* @param File\|EncryptedDBFile $file
638			* @param string $fileName
639			* @param string $mimeType
640			* @return void
641			*/
642			public static function sendDecryptedFile(File $file, $fileName = null, $mimeType = null)
643			{
644			if (!$fileName) {
645			$fileName = basename($file->getFilename());
646			}
647			if (!$mimeType) {
648			$mimeType = 'application/octetstream';
649			}
650			header('Content-disposition: attachment; filename="' . $fileName . '"');
651			header('Content-type: ' . $mimeType);
652			header('Pragma: no-cache');
653			header('Expires: 0');
654			$file->sendDecryptedFile();
655			}
656			}
657

lekoala / silverstripe-encrypt

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