OpensslKey::messageChecksum() - Code Metrics - Inspection of "13.1.2 Variable rescope" - mmeyer2k/dcrypt - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#32)

by Michael

created 2020-10-21 21:21 UTC

OpensslKey::messageChecksum() A

↳ Parent: OpensslKey

Complexity

Conditions	1
Paths	1

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	2
CRAP Score	1

Importance

Changes

Metric	Value
dl	0
loc	4
ccs	2
cts	2
cp	1
rs	10
c	0
b	0
f	0
cc	1
nc	1
nop	1
crap	1

<?php

declare(strict_types=1);

/**
 * OpensslKey.php.
 *
 * PHP version 7
 *
 * @category Dcrypt
 *
 * @author   Michael Meyer (mmeyer2k) <[email protected]>
 * @license  http://opensource.org/licenses/MIT The MIT License (MIT)
 *
 * @link     https://github.com/mmeyer2k/dcrypt
 */

namespace Dcrypt;

use Dcrypt\Exceptions\InvalidKeyException;

/**
 * Provides key derivation functions.
 *
 * @category Dcrypt
 *
 * @author   Michael Meyer (mmeyer2k) <[email protected]>
 * @license  http://opensource.org/licenses/MIT The MIT License (MIT)
 *
 * @link     https://github.com/mmeyer2k/dcrypt
 */
final class OpensslKey
{
    /**
     * High entropy key.
     *
     * @var string
     */
    private $_key;

    /**
     * Algo string.
     *
     * @var string
     */
    private $_algo;

    /**
     * High entropy salt.
     *
     * @var string
     */
    private $_iv;

    /**
     * Name of cipher
     *
     * @var string
     */
    private $_cipher;

    /**
     * OpensslKey constructor.
     *
     * @param string $key Key to use for encryption
     * @param string $algo Algo to use for HKDF
     * @param string $cipher Name of cipher
     * @param string $ivr Initialization vector
     *
     * @throws InvalidKeyException
     */
    public function __construct(
        string $key,
        string $algo,
        string $cipher = '',
        string $ivr = ''
    )
    {
        // Store the key as what was supplied
        $this->_key = \base64_decode($key, true);

        // If key was not proper base64, bail out
        if ($this->_key === false) {
            throw new InvalidKeyException(InvalidKeyException::BASE64ENC);
        }

        // If key was to short, bail out
        if (Str::strlen($this->_key) < 32) {
            throw new InvalidKeyException(InvalidKeyException::KEYLENGTH);
        }

        // Store algo in object
        $this->_algo = $algo;

        // Store init vector in object
        $this->_iv = $ivr;

        // Store the cipher name
        $this->_cipher = $cipher;
    }

    /**
     * Generate the authentication key.
     *
     * @return string
     */
    public function authenticationKey(): string
    {
        return $this->deriveKey(__FUNCTION__ . '|' . $this->_cipher);
    }

    /**
     * Generate the encryption key.
     *
     * @return string
     */
    public function encryptionKey(): string
    {
        return $this->deriveKey(__FUNCTION__ . '|' . $this->_cipher);
    }

    /**
     * Derive a key with differing info string parameters.
     *
     * @param string $info Info parameter to provide to hash_hkdf
     *
     * @return string
     */
    public function deriveKey(string $info): string
    {
        return \hash_hkdf($this->_algo, $this->_key, 0, $info, $this->_iv);
    }

    /**
     * Calculates a given message HMAC.
     *
     * @param string $message
     * @return string
     */
    public function messageChecksum(string $message): string
    {
        return \hash_hmac($this->_algo, $message, $this->authenticationKey(), true);
    }

    /**
     * Returns the iv that object was created with.
     *
     * @return string
     */
    public function iv(): string
    {
        return $this->_iv;
    }

    /**
     * Returns the cipher name
     *
     * @return string
     */
    public function cipher(): string
    {
        return $this->_cipher;
    }

    /**
     * Returns the cipher algo that object was created with.
     *
     * @return string
     */
    public function algo(): string
    {
        return $this->_algo;
    }

    /**
     * Generate a new key that meets requirements for dcrypt.
     *
     * @param int $bytes Size of key in bytes
     *
     * @return string
     * @throws InvalidKeyException
     */
    public static function create(int $bytes = 32): string
    {
        if ($bytes < 32) {
            throw new InvalidKeyException(InvalidKeyException::KEYLENGTH);
        }

        return \base64_encode(\random_bytes($bytes));
    }
}


1		<?php
2
3		declare(strict_types=1);
4
5		/**
6		* OpensslKey.php.
7		*
8		* PHP version 7
9		*
10		* @category Dcrypt
11		*
12		* @author Michael Meyer (mmeyer2k) <[email protected]>
13		* @license http://opensource.org/licenses/MIT The MIT License (MIT)
14		*
15		* @link https://github.com/mmeyer2k/dcrypt
16		*/
17
18		namespace Dcrypt;
19
20		use Dcrypt\Exceptions\InvalidKeyException;
21
22		/**
23		* Provides key derivation functions.
24		*
25		* @category Dcrypt
26		*
27		* @author Michael Meyer (mmeyer2k) <[email protected]>
28		* @license http://opensource.org/licenses/MIT The MIT License (MIT)
29		*
30		* @link https://github.com/mmeyer2k/dcrypt
31		*/
32		final class OpensslKey
33		{
34		/**
35		* High entropy key.
36		*
37		* @var string
38		*/
39		private $_key;
40
41		/**
42		* Algo string.
43		*
44		* @var string
45		*/
46		private $_algo;
47
48		/**
49		* High entropy salt.
50		*
51		* @var string
52		*/
53		private $_iv;
54
55		/**
56		* Name of cipher
57		*
58		* @var string
59		*/
60		private $_cipher;
61
62		/**
63		* OpensslKey constructor.
64		*
65		* @param string $key Key to use for encryption
66		* @param string $algo Algo to use for HKDF
67		* @param string $cipher Name of cipher
68		* @param string $ivr Initialization vector
69		*
70		* @throws InvalidKeyException
71		*/
72	48	public function __construct(
73		string $key,
74		string $algo,
75		string $cipher = '',
76		string $ivr = ''
77		)
78		{
79		// Store the key as what was supplied
80	48	$this->_key = \base64_decode($key, true);
81
82		// If key was not proper base64, bail out
83	48	if ($this->_key === false) {
84	9	throw new InvalidKeyException(InvalidKeyException::BASE64ENC);
85		}
86
87		// If key was to short, bail out
88	39	if (Str::strlen($this->_key) < 32) {
89		throw new InvalidKeyException(InvalidKeyException::KEYLENGTH);
90		}
91
92		// Store algo in object
93	39	$this->_algo = $algo;
94
95		// Store init vector in object
96	39	$this->_iv = $ivr;
97
98		// Store the cipher name
99	39	$this->_cipher = $cipher;
100	39	}
101
102		/**
103		* Generate the authentication key.
104		*
105		* @return string
106		*/
107	36	public function authenticationKey(): string
108		{
109	36	return $this->deriveKey(__FUNCTION__ . '\|' . $this->_cipher);
110		}
111
112		/**
113		* Generate the encryption key.
114		*
115		* @return string
116		*/
117	37	public function encryptionKey(): string
118		{
119	37	return $this->deriveKey(__FUNCTION__ . '\|' . $this->_cipher);
120		}
121
122		/**
123		* Derive a key with differing info string parameters.
124		*
125		* @param string $info Info parameter to provide to hash_hkdf
126		*
127		* @return string
128		*/
129	39	public function deriveKey(string $info): string
130		{
131	39	return \hash_hkdf($this->_algo, $this->_key, 0, $info, $this->_iv);
132		}
133
134		/**
135		* Calculates a given message HMAC.
136		*
137		* @param string $message
138		* @return string
139		*/
140	36	public function messageChecksum(string $message): string
141		{
142	36	return \hash_hmac($this->_algo, $message, $this->authenticationKey(), true);
143		}
144
145		/**
146		* Returns the iv that object was created with.
147		*
148		* @return string
149		*/
150	37	public function iv(): string
151		{
152	37	return $this->_iv;
153		}
154
155		/**
156		* Returns the cipher name
157		*
158		* @return string
159		*/
160	36	public function cipher(): string
161		{
162	36	return $this->_cipher;
163		}
164
165		/**
166		* Returns the cipher algo that object was created with.
167		*
168		* @return string
169		*/
170		public function algo(): string
171		{
172		return $this->_algo;
173		}
174
175		/**
176		* Generate a new key that meets requirements for dcrypt.
177		*
178		* @param int $bytes Size of key in bytes
179		*
180		* @return string
181		* @throws InvalidKeyException
182		*/
183	31	public static function create(int $bytes = 32): string
184		{
185	31	if ($bytes < 32) {
186	1	throw new InvalidKeyException(InvalidKeyException::KEYLENGTH);
187		}
188
189	31	return \base64_encode(\random_bytes($bytes));
190		}
191		}
192

mmeyer2k / dcrypt

Pull Request — master (#32)

OpensslKey::messageChecksum() A

Complexity

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