ECDHES::createOKPKey() - Code Metrics - Inspection of "Merge pull request #213 from web-token/v2.1" - web-token/jwt-framework - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 7b61ef...71e756 )

by Florent

created 2019-09-11 10:45 UTC

ECDHES::createOKPKey() A

↳ Parent: ECDHES

Complexity

Conditions	3
Paths	3

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
dl	0
loc	27
rs	9.488
c	0
b	0
f	0
cc	3
nc	3
nop	1

<?php

declare(strict_types=1);

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2014-2019 Spomky-Labs
 *
 * This software may be modified and distributed under the terms
 * of the MIT license.  See the LICENSE file for details.
 */

namespace Jose\Component\Encryption\Algorithm\KeyEncryption;

use Base64Url\Base64Url;
use GMP;
use InvalidArgumentException;
use Jose\Component\Core\JWK;
use Jose\Component\Core\Util\Ecc\Curve;
use Jose\Component\Core\Util\Ecc\EcDH;
use Jose\Component\Core\Util\Ecc\NistCurve;
use Jose\Component\Core\Util\Ecc\PrivateKey;
use Jose\Component\Core\Util\ECKey;
use Jose\Component\Encryption\Algorithm\KeyEncryption\Util\ConcatKDF;
use RuntimeException;

final class ECDHES implements KeyAgreement
{
    public function allowedKeyTypes(): array
    {
        return ['EC', 'OKP'];
    }

    public function getAgreementKey(int $encryptionKeyLength, string $algorithm, JWK $recipientKey, ?JWK $senderKey, array $complete_header = [], array &$additional_header_values = []): string
    {
        if ($recipientKey->has('d')) {
            list($public_key, $private_key) = $this->getKeysFromPrivateKeyAndHeader($recipientKey, $complete_header);
        } else {
            list($public_key, $private_key) = $this->getKeysFromPublicKey($recipientKey, $additional_header_values);
        }

        $agreed_key = $this->calculateAgreementKey($private_key, $public_key);

        $apu = \array_key_exists('apu', $complete_header) ? $complete_header['apu'] : '';
        $apv = \array_key_exists('apv', $complete_header) ? $complete_header['apv'] : '';

        return ConcatKDF::generate($agreed_key, $algorithm, $encryptionKeyLength, $apu, $apv);
    }

    public function calculateAgreementKey(JWK $private_key, JWK $public_key): string
    {
        switch ($public_key->get('crv')) {
            case 'P-256':
            case 'P-384':
            case 'P-521':
                $curve = $this->getCurve($public_key->get('crv'));
                if (\function_exists('openssl_pkey_derive')) {
                    try {
                        $publicPem = ECKey::convertPublicKeyToPEM($public_key);
                        $privatePem = ECKey::convertPrivateKeyToPEM($private_key);

                        return openssl_pkey_derive($publicPem, $privatePem, $curve->getSize());
                    } catch (\Throwable $throwable) {
                        //Does nothing. Will fallback to the pure PHP function
                    }
                }

                $rec_x = $this->convertBase64ToGmp($public_key->get('x'));
                $rec_y = $this->convertBase64ToGmp($public_key->get('y'));
                $sen_d = $this->convertBase64ToGmp($private_key->get('d'));

                $priv_key = PrivateKey::create($sen_d);
                $pub_key = $curve->getPublicKeyFrom($rec_x, $rec_y);

                return $this->convertDecToBin(EcDH::computeSharedKey($curve, $pub_key, $priv_key));
            case 'X25519':
                $sKey = Base64Url::decode($private_key->get('d'));
                $recipientPublickey = Base64Url::decode($public_key->get('x'));

                return sodium_crypto_scalarmult($sKey, $recipientPublickey);
            default:
                throw new InvalidArgumentException(sprintf('The curve "%s" is not supported', $public_key->get('crv')));
        }
    }

    public function name(): string
    {
        return 'ECDH-ES';
    }

    public function getKeyManagementMode(): string
    {
        return self::MODE_AGREEMENT;
    }

    /**
     * @return JWK[]
     */
    private function getKeysFromPublicKey(JWK $recipient_key, array &$additional_header_values): array
    {
        $this->checkKey($recipient_key, false);
        $public_key = $recipient_key;
        switch ($public_key->get('crv')) {
            case 'P-256':
            case 'P-384':
            case 'P-521':
                $private_key = ECKey::createECKey($public_key->get('crv'));

                break;
            case 'X25519':
                $this->checkSodiumExtensionIsAvailable();
                $private_key = $this->createOKPKey('X25519');

                break;
            default:
                throw new InvalidArgumentException(sprintf('The curve "%s" is not supported', $public_key->get('crv')));
        }
        $epk = $private_key->toPublic()->all();
        $additional_header_values['epk'] = $epk;

        return [$public_key, $private_key];
    }

    /**
     * @return JWK[]
     */
    private function getKeysFromPrivateKeyAndHeader(JWK $recipient_key, array $complete_header): array
    {
        $this->checkKey($recipient_key, true);
        $private_key = $recipient_key;
        $public_key = $this->getPublicKey($complete_header);
        if ($private_key->get('crv') !== $public_key->get('crv')) {
            throw new InvalidArgumentException('Curves are different');
        }

        return [$public_key, $private_key];
    }

    private function getPublicKey(array $complete_header): JWK
    {
        if (!isset($complete_header['epk'])) {
            throw new InvalidArgumentException('The header parameter "epk" is missing.');
        }
        if (!\is_array($complete_header['epk'])) {
            throw new InvalidArgumentException('The header parameter "epk" is not an array of parameters');
        }
        $public_key = new JWK($complete_header['epk']);
        $this->checkKey($public_key, false);

        return $public_key;
    }

    private function checkKey(JWK $key, bool $is_private): void
    {
        if (!\in_array($key->get('kty'), $this->allowedKeyTypes(), true)) {
            throw new InvalidArgumentException('Wrong key type.');
        }
        foreach (['x', 'crv'] as $k) {
            if (!$key->has($k)) {
                throw new InvalidArgumentException(sprintf('The key parameter "%s" is missing.', $k));
            }
        }

        switch ($key->get('crv')) {
            case 'P-256':
            case 'P-384':
            case 'P-521':
                if (!$key->has('y')) {
                    throw new InvalidArgumentException('The key parameter "y" is missing.');
                }

                break;
            case 'X25519':
                break;
            default:
                throw new InvalidArgumentException(sprintf('The curve "%s" is not supported', $key->get('crv')));
        }
        if (true === $is_private && !$key->has('d')) {
            throw new InvalidArgumentException('The key parameter "d" is missing.');
        }
    }

    private function getCurve(string $crv): Curve
    {
        switch ($crv) {
            case 'P-256':
                return NistCurve::curve256();
            case 'P-384':
                return NistCurve::curve384();
            case 'P-521':
                return NistCurve::curve521();
            default:
                throw new InvalidArgumentException(sprintf('The curve "%s" is not supported', $crv));
        }
    }

    private function convertBase64ToGmp(string $value): GMP
    {
        $value = unpack('H*', Base64Url::decode($value));

        return gmp_init($value[1], 16);
    }

    private function convertDecToBin(GMP $dec): string
    {
        if (gmp_cmp($dec, 0) < 0) {
            throw new \InvalidArgumentException('Unable to convert negative integer to string');
        }
        $hex = gmp_strval($dec, 16);

        if (0 !== mb_strlen($hex, '8bit') % 2) {
            $hex = '0'.$hex;
        }

        return hex2bin($hex);
    }

    /**
     * @param string $curve The curve
     */
    private function createOKPKey(string $curve): JWK
    {
        $this->checkSodiumExtensionIsAvailable();
        switch ($curve) {
            case 'X25519':
                $keyPair = sodium_crypto_box_keypair();
                $d = sodium_crypto_box_secretkey($keyPair);
                $x = sodium_crypto_box_publickey($keyPair);

                break;
            case 'Ed25519':
                $keyPair = sodium_crypto_sign_keypair();
                $d = sodium_crypto_sign_secretkey($keyPair);
                $x = sodium_crypto_sign_publickey($keyPair);

                break;
            default:
                throw new InvalidArgumentException(sprintf('Unsupported "%s" curve', $curve));
        }

        return new JWK([
            'kty' => 'OKP',
            'crv' => $curve,
            'x' => Base64Url::encode($x),
            'd' => Base64Url::encode($d),
        ]);
    }

    private function checkSodiumExtensionIsAvailable(): void
    {
        if (!\extension_loaded('sodium')) {
            throw new RuntimeException('The extension "sodium" is not available. Please install it to use this method');
        }
    }
}


1			<?php
2
3			declare(strict_types=1);
4
5			/*
6			* The MIT License (MIT)
7			*
8			* Copyright (c) 2014-2019 Spomky-Labs
9			*
10			* This software may be modified and distributed under the terms
11			* of the MIT license. See the LICENSE file for details.
12			*/
13
14			namespace Jose\Component\Encryption\Algorithm\KeyEncryption;
15
16			use Base64Url\Base64Url;
17			use GMP;
18			use InvalidArgumentException;
19			use Jose\Component\Core\JWK;
20			use Jose\Component\Core\Util\Ecc\Curve;
21			use Jose\Component\Core\Util\Ecc\EcDH;
22			use Jose\Component\Core\Util\Ecc\NistCurve;
23			use Jose\Component\Core\Util\Ecc\PrivateKey;
24			use Jose\Component\Core\Util\ECKey;
25			use Jose\Component\Encryption\Algorithm\KeyEncryption\Util\ConcatKDF;
26			use RuntimeException;
27
28			final class ECDHES implements KeyAgreement
29			{
30			public function allowedKeyTypes(): array
31			{
32			return ['EC', 'OKP'];
33			}
34
35			public function getAgreementKey(int $encryptionKeyLength, string $algorithm, JWK $recipientKey, ?JWK $senderKey, array $complete_header = [], array &$additional_header_values = []): string
36			{
37			if ($recipientKey->has('d')) {
38			list($public_key, $private_key) = $this->getKeysFromPrivateKeyAndHeader($recipientKey, $complete_header);
39			} else {
40			list($public_key, $private_key) = $this->getKeysFromPublicKey($recipientKey, $additional_header_values);
41			}
42
43			$agreed_key = $this->calculateAgreementKey($private_key, $public_key);
44
45			$apu = \array_key_exists('apu', $complete_header) ? $complete_header['apu'] : '';
46			$apv = \array_key_exists('apv', $complete_header) ? $complete_header['apv'] : '';
47
48			return ConcatKDF::generate($agreed_key, $algorithm, $encryptionKeyLength, $apu, $apv);
49			}
50
51			public function calculateAgreementKey(JWK $private_key, JWK $public_key): string
52			{
53			switch ($public_key->get('crv')) {
54			case 'P-256':
55			case 'P-384':
56			case 'P-521':
57			$curve = $this->getCurve($public_key->get('crv'));
58			if (\function_exists('openssl_pkey_derive')) {
59			try {
60			$publicPem = ECKey::convertPublicKeyToPEM($public_key);
61			$privatePem = ECKey::convertPrivateKeyToPEM($private_key);
62
63			return openssl_pkey_derive($publicPem, $privatePem, $curve->getSize());
64			} catch (\Throwable $throwable) {
65			//Does nothing. Will fallback to the pure PHP function
66			}
67			}
68
69			$rec_x = $this->convertBase64ToGmp($public_key->get('x'));
70			$rec_y = $this->convertBase64ToGmp($public_key->get('y'));
71			$sen_d = $this->convertBase64ToGmp($private_key->get('d'));
72
73			$priv_key = PrivateKey::create($sen_d);
74			$pub_key = $curve->getPublicKeyFrom($rec_x, $rec_y);
75
76			return $this->convertDecToBin(EcDH::computeSharedKey($curve, $pub_key, $priv_key));
77			case 'X25519':
78			$sKey = Base64Url::decode($private_key->get('d'));
79			$recipientPublickey = Base64Url::decode($public_key->get('x'));
80
81			return sodium_crypto_scalarmult($sKey, $recipientPublickey);
82			default:
83			throw new InvalidArgumentException(sprintf('The curve "%s" is not supported', $public_key->get('crv')));
84			}
85			}
86
87			public function name(): string
88			{
89			return 'ECDH-ES';
90			}
91
92			public function getKeyManagementMode(): string
93			{
94			return self::MODE_AGREEMENT;
95			}
96
97			/**
98			* @return JWK[]
99			*/
100			private function getKeysFromPublicKey(JWK $recipient_key, array &$additional_header_values): array
101			{
102			$this->checkKey($recipient_key, false);
103			$public_key = $recipient_key;
104			switch ($public_key->get('crv')) {
105			case 'P-256':
106			case 'P-384':
107			case 'P-521':
108			$private_key = ECKey::createECKey($public_key->get('crv'));
109
110			break;
111			case 'X25519':
112			$this->checkSodiumExtensionIsAvailable();
113			$private_key = $this->createOKPKey('X25519');
114
115			break;
116			default:
117			throw new InvalidArgumentException(sprintf('The curve "%s" is not supported', $public_key->get('crv')));
118			}
119			$epk = $private_key->toPublic()->all();
120			$additional_header_values['epk'] = $epk;
121
122			return [$public_key, $private_key];
123			}
124
125			/**
126			* @return JWK[]
127			*/
128			private function getKeysFromPrivateKeyAndHeader(JWK $recipient_key, array $complete_header): array
129			{
130			$this->checkKey($recipient_key, true);
131			$private_key = $recipient_key;
132			$public_key = $this->getPublicKey($complete_header);
133			if ($private_key->get('crv') !== $public_key->get('crv')) {
134			throw new InvalidArgumentException('Curves are different');
135			}
136
137			return [$public_key, $private_key];
138			}
139
140			private function getPublicKey(array $complete_header): JWK
141			{
142			if (!isset($complete_header['epk'])) {
143			throw new InvalidArgumentException('The header parameter "epk" is missing.');
144			}
145			if (!\is_array($complete_header['epk'])) {
146			throw new InvalidArgumentException('The header parameter "epk" is not an array of parameters');
147			}
148			$public_key = new JWK($complete_header['epk']);
149			$this->checkKey($public_key, false);
150
151			return $public_key;
152			}
153
154			private function checkKey(JWK $key, bool $is_private): void
155			{
156			if (!\in_array($key->get('kty'), $this->allowedKeyTypes(), true)) {
157			throw new InvalidArgumentException('Wrong key type.');
158			}
159			foreach (['x', 'crv'] as $k) {
160			if (!$key->has($k)) {
161			throw new InvalidArgumentException(sprintf('The key parameter "%s" is missing.', $k));
162			}
163			}
164
165			switch ($key->get('crv')) {
166			case 'P-256':
167			case 'P-384':
168			case 'P-521':
169			if (!$key->has('y')) {
170			throw new InvalidArgumentException('The key parameter "y" is missing.');
171			}
172
173			break;
174			case 'X25519':
175			break;
176			default:
177			throw new InvalidArgumentException(sprintf('The curve "%s" is not supported', $key->get('crv')));
178			}
179			if (true === $is_private && !$key->has('d')) {
180			throw new InvalidArgumentException('The key parameter "d" is missing.');
181			}
182			}
183
184			private function getCurve(string $crv): Curve
185			{
186			switch ($crv) {
187			case 'P-256':
188			return NistCurve::curve256();
189			case 'P-384':
190			return NistCurve::curve384();
191			case 'P-521':
192			return NistCurve::curve521();
193			default:
194			throw new InvalidArgumentException(sprintf('The curve "%s" is not supported', $crv));
195			}
196			}
197
198			private function convertBase64ToGmp(string $value): GMP
199			{
200			$value = unpack('H*', Base64Url::decode($value));
201
202			return gmp_init($value[1], 16);
203			}
204
205			private function convertDecToBin(GMP $dec): string
206			{
207			if (gmp_cmp($dec, 0) < 0) {
208			throw new \InvalidArgumentException('Unable to convert negative integer to string');
209			}
210			$hex = gmp_strval($dec, 16);
211
212			if (0 !== mb_strlen($hex, '8bit') % 2) {
213			$hex = '0'.$hex;
214			}
215
216			return hex2bin($hex);
217			}
218
219			/**
220			* @param string $curve The curve
221			*/
222			private function createOKPKey(string $curve): JWK
223			{
224			$this->checkSodiumExtensionIsAvailable();
225			switch ($curve) {
226			case 'X25519':
227			$keyPair = sodium_crypto_box_keypair();
228			$d = sodium_crypto_box_secretkey($keyPair);
229			$x = sodium_crypto_box_publickey($keyPair);
230
231			break;
232			case 'Ed25519':
233			$keyPair = sodium_crypto_sign_keypair();
234			$d = sodium_crypto_sign_secretkey($keyPair);
235			$x = sodium_crypto_sign_publickey($keyPair);
236
237			break;
238			default:
239			throw new InvalidArgumentException(sprintf('Unsupported "%s" curve', $curve));
240			}
241
242			return new JWK([
243			'kty' => 'OKP',
244			'crv' => $curve,
245			'x' => Base64Url::encode($x),
246			'd' => Base64Url::encode($d),
247			]);
248			}
249
250			private function checkSodiumExtensionIsAvailable(): void
251			{
252			if (!\extension_loaded('sodium')) {
253			throw new RuntimeException('The extension "sodium" is not available. Please install it to use this method');
254			}
255			}
256			}
257

web-token / jwt-framework

Push — master ( 7b61ef...71e756 )

ECDHES::createOKPKey() A

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