HierarchicalKey::derivePath() - Code Metrics - Inspection of "HierarchicalKey: add getAddress and getScriptAndSi..." - Bit-Wasp/bitcoin-php - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#662)

by thomas

created 2018-03-09 00:59 UTC

HierarchicalKey::derivePath() A

↳ Parent: HierarchicalKey

Complexity

Conditions	1
Paths	1

Size

Total Lines	5
Code Lines	3

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	3
CRAP Score	1

Importance

Changes

Metric	Value
cc	1
eloc	3
nc	1
nop	1
dl	0
loc	5
ccs	3
cts	3
cp	1
crap	1
rs	9.4285
c	0
b	0
f	0

<?php

declare(strict_types=1);

namespace BitWasp\Bitcoin\Key\Deterministic;

use BitWasp\Bitcoin\Address\BaseAddressCreator;
use BitWasp\Bitcoin\Bitcoin;
use BitWasp\Bitcoin\Crypto\EcAdapter\Adapter\EcAdapterInterface;
use BitWasp\Bitcoin\Crypto\EcAdapter\Key\KeyInterface;
use BitWasp\Bitcoin\Crypto\EcAdapter\Key\PrivateKeyInterface;
use BitWasp\Bitcoin\Crypto\EcAdapter\Key\PublicKeyInterface;
use BitWasp\Bitcoin\Crypto\Hash;
use BitWasp\Bitcoin\Key\KeyToScript\ScriptAndSignData;
use BitWasp\Bitcoin\Key\KeyToScript\ScriptDataFactory;
use BitWasp\Bitcoin\Network\NetworkInterface;
use BitWasp\Bitcoin\Serializer\Key\HierarchicalKey\Base58ExtendedKeySerializer;
use BitWasp\Bitcoin\Serializer\Key\HierarchicalKey\ExtendedKeySerializer;
use BitWasp\Bitcoin\Util\IntRange;
use BitWasp\Buffertools\Buffer;
use BitWasp\Buffertools\BufferInterface;

class HierarchicalKey
{
    /**
     * @var EcAdapterInterface
     */
    protected $ecAdapter;

    /**
     * @var int
     */
    private $depth;

    /**
     * @var int
     */
    private $parentFingerprint;

    /**
     * @var int
     */
    private $sequence;

    /**
     * @var BufferInterface
     */
    private $chainCode;

    /**
     * @var KeyInterface
     */
    private $key;

    /**
     * @var ScriptDataFactory
     */
    private $scriptDataFactory;

    /**
     * @var ScriptAndSignData|null
     */
    private $scriptAndSignData;

    /**
     * @param EcAdapterInterface $ecAdapter
     * @param ScriptDataFactory $scriptDataFactory
     * @param int $depth
     * @param int $parentFingerprint
     * @param int $sequence
     * @param BufferInterface $chainCode
     * @param KeyInterface $key
     */
    public function __construct(EcAdapterInterface $ecAdapter, ScriptDataFactory $scriptDataFactory, int $depth, int $parentFingerprint, int $sequence, BufferInterface $chainCode, KeyInterface $key)
    {
        if ($depth < 0 || $depth > IntRange::U8_MAX) {
            throw new \InvalidArgumentException('Invalid depth for BIP32 key, must be in range [0 - 255] inclusive');
        }

        if ($parentFingerprint < 0 || $parentFingerprint > IntRange::U32_MAX) {
            throw new \InvalidArgumentException('Invalid fingerprint for BIP32 key, must be in range [0 - (2^31)-1] inclusive');
        }

        if ($sequence < 0 || $sequence > IntRange::U32_MAX) {
            throw new \InvalidArgumentException('Invalid sequence for BIP32 key, must be in range [0 - (2^31)-1] inclusive');
        }

        if ($chainCode->getSize() !== 32) {
            throw new \RuntimeException('Chaincode should be 32 bytes');
        }

        if (!$key->isCompressed()) {
            throw new \InvalidArgumentException('A HierarchicalKey must always be compressed');
        }

        $this->ecAdapter = $ecAdapter;
        $this->depth = $depth;
        $this->sequence = $sequence;
        $this->parentFingerprint = $parentFingerprint;
        $this->chainCode = $chainCode;
        $this->key = $key;
        $this->scriptDataFactory = $scriptDataFactory;
    }

    /**
     * Return the depth of this key. This is limited to 256 sequential derivations.
     *
     * @return int
     */
    public function getDepth(): int
    {
        return $this->depth;
    }

    /**
     * Get the sequence number for this address. Hardened keys are
     * created with sequence > 0x80000000. a sequence number lower
     * than this can be derived with the public key.
     *
     * @return int
     */
    public function getSequence(): int
    {
        return $this->sequence;
    }

    /**
     * Get the fingerprint of the parent key. For master keys, this is 00000000.
     *
     * @return int
     */
    public function getFingerprint(): int
    {
        if ($this->getDepth() === 0) {
            return 0;
        }

        return $this->parentFingerprint;
    }

    /**
     * Return the fingerprint to be used for child keys.
     * @return int
     */
    public function getChildFingerprint(): int
    {
        $pubKeyHash = $this->getPublicKey()->getPubKeyHash();
        return (int) $pubKeyHash->slice(0, 4)->getInt();
    }

    /**
     * Return the chain code - a deterministic 'salt' for HMAC-SHA512
     * in child derivations
     *
     * @return BufferInterface
     */
    public function getChainCode(): BufferInterface
    {
        return $this->chainCode;
    }

    /**
     * @return PrivateKeyInterface
     */
    public function getPrivateKey(): PrivateKeyInterface
    {
        if ($this->key->isPrivate()) {
            /** @var PrivateKeyInterface $key */
            $key = $this->key;
            return $key;
        }

        throw new \RuntimeException('Unable to get private key, not known');
    }

    /**
     * Get the public key the private key or public key.
     *
     * @return PublicKeyInterface
     */
    public function getPublicKey(): PublicKeyInterface
    {
        if ($this->isPrivate()) {
            return $this->getPrivateKey()->getPublicKey();
        } else {
            /** @var PublicKeyInterface $key */
            $key = $this->key;
            return $key;
        }
    }

    /**
     * @return HierarchicalKey
     */
    public function withoutPrivateKey(): HierarchicalKey
    {
        $clone = clone $this;
        $clone->key = $clone->getPublicKey();
        return $clone;
    }

    /**
     * @param ScriptDataFactory $factory
     * @return HierarchicalKey
     */
    public function withScriptFactory(ScriptDataFactory $factory)
    {
        $clone = clone $this;
        $clone->scriptDataFactory = $factory;
        return $clone;
    }

    /**
     * @return ScriptDataFactory
     */
    public function getScriptDataFactory()
    {
        return $this->scriptDataFactory;
    }

    /**
     * @return \BitWasp\Bitcoin\Key\KeyToScript\ScriptAndSignData
     */
    public function getScriptAndSignData()
    {
        if (null === $this->scriptAndSignData) {
            $this->scriptAndSignData = $this->scriptDataFactory->convertKey($this->key);
        }

        return $this->scriptAndSignData;
    }

    /**
     * @param BaseAddressCreator $addressCreator
     * @return \BitWasp\Bitcoin\Address\Address
     */
    public function getAddress(BaseAddressCreator $addressCreator)
    {
        return $this->getScriptAndSignData()->getAddress($addressCreator);
    }

    /**
     * Return whether this is a private key
     *
     * @return bool
     */
    public function isPrivate(): bool
    {
        return $this->key->isPrivate();
    }

    /**
     * Return whether the key is hardened
     *
     * @return bool
     */
    public function isHardened(): bool
    {
        return ($this->sequence >> 31) === 1;
    }

    /**
     * Create a buffer containing data to be hashed hashed to yield the child offset
     *
     * @param int $sequence
     * @return BufferInterface
     * @throws \Exception
     */
    public function getHmacSeed(int $sequence): BufferInterface
    {
        if ($sequence < 0 || $sequence > IntRange::U32_MAX) {
            throw new \InvalidArgumentException("Sequence is outside valid range, must be >= 0 && <= (2^31)-1");
        }

        if (($sequence >> 31) === 1) {
            if ($this->isPrivate() === false) {
                throw new \Exception("Can't derive a hardened key without the private key");
            }

            $data = "\x00{$this->getPrivateKey()->getBinary()}";
        } else {
            $data = $this->getPublicKey()->getBinary();
        }

        return new Buffer($data . pack("N", $sequence));
    }

    /**
     * Derive a child key
     *
     * @param int $sequence
     * @return HierarchicalKey
     * @throws \Exception
     */
    public function deriveChild(int $sequence): HierarchicalKey
    {
        $nextDepth = $this->depth + 1;
        if ($nextDepth > 255) {
            throw new \InvalidArgumentException('Invalid depth for BIP32 key, cannot exceed 255');
        }

        $hash = Hash::hmac('sha512', $this->getHmacSeed($sequence), $this->chainCode);
        $offset = $hash->slice(0, 32);
        $chain = $hash->slice(32);

        if (false === $this->ecAdapter->validatePrivateKey($offset)) {
            return $this->deriveChild($sequence + 1);
        }

        $key = $this->isPrivate() ? $this->getPrivateKey() : $this->getPublicKey();
        $key = $key->tweakAdd($offset->getGmp());

        return new HierarchicalKey(
            $this->ecAdapter,
            $this->scriptDataFactory,
            $nextDepth,
            $this->getChildFingerprint(),
            $sequence,
            $chain,
            $key
        );
    }

    /**
     * @param array|\stdClass|\Traversable $list
     * @return HierarchicalKey
     * @throws \Exception
     */
    public function deriveFromList($list): HierarchicalKey
    {
        if (!is_array($list) && !$list instanceof \Traversable && !$list instanceof \stdClass) {
            throw new \InvalidArgumentException('List must be an array or \Traversable');
        }

        $key = $this;
        foreach ($list as $sequence) {
$collection = json_decode($data, true);
if ( ! is_array($collection)) {
    throw new \RuntimeException('$collection must be an array.');
}

foreach ($collection as $item) { /** ... */ }
            $key = $key->deriveChild((int) $sequence);
        }

        return $key;
    }

    /**
     * Decodes a BIP32 path into actual 32bit sequence numbers and derives the child key
     *
     * @param string $path
     * @return HierarchicalKey
     * @throws \Exception
     */
    public function derivePath(string $path): HierarchicalKey
    {
        $sequences = new HierarchicalKeySequence();
        return $this->deriveFromList($sequences->decodePath($path));
    }

    /**
     * Serializes the instance according to whether it wraps a private or public key.
     * @param NetworkInterface $network
     * @return string
     */
    public function toExtendedKey(NetworkInterface $network = null): string
    {
        $network = $network ?: Bitcoin::getNetwork();

        $extendedSerializer = new Base58ExtendedKeySerializer(new ExtendedKeySerializer($this->ecAdapter));
        $extended = $extendedSerializer->serialize($network, $this);
        return $extended;
    }

    /**
     * Explicitly serialize as a private key. Throws an exception if
     * the key isn't private.
     *
     * @param NetworkInterface $network
     * @return string
     */
    public function toExtendedPrivateKey(NetworkInterface $network = null): string
    {
        if (!$this->isPrivate()) {
            throw new \LogicException('Cannot create extended private key from public');
        }

        return $this->toExtendedKey($network);
    }

    /**
     * Explicitly serialize as a public key. This will always work.
     *
     * @param NetworkInterface $network
     * @return string
     */
    public function toExtendedPublicKey(NetworkInterface $network = null): string
    {
        return $this->withoutPrivateKey()->toExtendedKey($network);
    }
}


1		<?php
2
3		declare(strict_types=1);
4
5		namespace BitWasp\Bitcoin\Key\Deterministic;
6
7		use BitWasp\Bitcoin\Address\BaseAddressCreator;
8		use BitWasp\Bitcoin\Bitcoin;
9		use BitWasp\Bitcoin\Crypto\EcAdapter\Adapter\EcAdapterInterface;
10		use BitWasp\Bitcoin\Crypto\EcAdapter\Key\KeyInterface;
11		use BitWasp\Bitcoin\Crypto\EcAdapter\Key\PrivateKeyInterface;
12		use BitWasp\Bitcoin\Crypto\EcAdapter\Key\PublicKeyInterface;
13		use BitWasp\Bitcoin\Crypto\Hash;
14		use BitWasp\Bitcoin\Key\KeyToScript\ScriptAndSignData;
15		use BitWasp\Bitcoin\Key\KeyToScript\ScriptDataFactory;
16		use BitWasp\Bitcoin\Network\NetworkInterface;
17		use BitWasp\Bitcoin\Serializer\Key\HierarchicalKey\Base58ExtendedKeySerializer;
18		use BitWasp\Bitcoin\Serializer\Key\HierarchicalKey\ExtendedKeySerializer;
19		use BitWasp\Bitcoin\Util\IntRange;
20		use BitWasp\Buffertools\Buffer;
21		use BitWasp\Buffertools\BufferInterface;
22
23		class HierarchicalKey
24		{
25		/**
26		* @var EcAdapterInterface
27		*/
28		protected $ecAdapter;
29
30		/**
31		* @var int
32		*/
33		private $depth;
34
35		/**
36		* @var int
37		*/
38		private $parentFingerprint;
39
40		/**
41		* @var int
42		*/
43		private $sequence;
44
45		/**
46		* @var BufferInterface
47		*/
48		private $chainCode;
49
50		/**
51		* @var KeyInterface
52		*/
53		private $key;
54
55		/**
56		* @var ScriptDataFactory
57		*/
58		private $scriptDataFactory;
59
60		/**
61		* @var ScriptAndSignData\|null
62		*/
63		private $scriptAndSignData;
64
65		/**
66		* @param EcAdapterInterface $ecAdapter
67		* @param ScriptDataFactory $scriptDataFactory
68		* @param int $depth
69		* @param int $parentFingerprint
70		* @param int $sequence
71		* @param BufferInterface $chainCode
72		* @param KeyInterface $key
73		*/
74	71	public function __construct(EcAdapterInterface $ecAdapter, ScriptDataFactory $scriptDataFactory, int $depth, int $parentFingerprint, int $sequence, BufferInterface $chainCode, KeyInterface $key)
75		{
76	71	if ($depth < 0 \|\| $depth > IntRange::U8_MAX) {
77		throw new \InvalidArgumentException('Invalid depth for BIP32 key, must be in range [0 - 255] inclusive');
78		}
79
80	71	if ($parentFingerprint < 0 \|\| $parentFingerprint > IntRange::U32_MAX) {
81		throw new \InvalidArgumentException('Invalid fingerprint for BIP32 key, must be in range [0 - (2^31)-1] inclusive');
82		}
83
84	71	if ($sequence < 0 \|\| $sequence > IntRange::U32_MAX) {
85		throw new \InvalidArgumentException('Invalid sequence for BIP32 key, must be in range [0 - (2^31)-1] inclusive');
86		}
87
88	71	if ($chainCode->getSize() !== 32) {
89		throw new \RuntimeException('Chaincode should be 32 bytes');
90		}
91
92	71	if (!$key->isCompressed()) {
93	1	throw new \InvalidArgumentException('A HierarchicalKey must always be compressed');
94		}
95
96	70	$this->ecAdapter = $ecAdapter;
97	70	$this->depth = $depth;
98	70	$this->sequence = $sequence;
99	70	$this->parentFingerprint = $parentFingerprint;
100	70	$this->chainCode = $chainCode;
101	70	$this->key = $key;
102	70	$this->scriptDataFactory = $scriptDataFactory;
103	70	}
104
105		/**
106		* Return the depth of this key. This is limited to 256 sequential derivations.
107		*
108		* @return int
109		*/
110	30	public function getDepth(): int
111		{
112	30	return $this->depth;
113		}
114
115		/**
116		* Get the sequence number for this address. Hardened keys are
117		* created with sequence > 0x80000000. a sequence number lower
118		* than this can be derived with the public key.
119		*
120		* @return int
121		*/
122	25	public function getSequence(): int
123		{
124	25	return $this->sequence;
125		}
126
127		/**
128		* Get the fingerprint of the parent key. For master keys, this is 00000000.
129		*
130		* @return int
131		*/
132	26	public function getFingerprint(): int
133		{
134	26	if ($this->getDepth() === 0) {
135	14	return 0;
136		}
137
138	22	return $this->parentFingerprint;
139		}
140
141		/**
142		* Return the fingerprint to be used for child keys.
143		* @return int
144		*/
145	33	public function getChildFingerprint(): int
146		{
147	33	$pubKeyHash = $this->getPublicKey()->getPubKeyHash();
148	33	return (int) $pubKeyHash->slice(0, 4)->getInt();
149		}
150
151		/**
152		* Return the chain code - a deterministic 'salt' for HMAC-SHA512
153		* in child derivations
154		*
155		* @return BufferInterface
156		*/
157	24	public function getChainCode(): BufferInterface
158		{
159	24	return $this->chainCode;
160		}
161
162		/**
163		* @return PrivateKeyInterface
164		*/
165	42	public function getPrivateKey(): PrivateKeyInterface
166		{
167	42	if ($this->key->isPrivate()) {
168		/** @var PrivateKeyInterface $key */
169	40	$key = $this->key;
170	40	return $key;
171		}
172
173	2	throw new \RuntimeException('Unable to get private key, not known');
174		}
175
176		/**
177		* Get the public key the private key or public key.
178		*
179		* @return PublicKeyInterface
180		*/
181	44	public function getPublicKey(): PublicKeyInterface
182		{
183	44	if ($this->isPrivate()) {
184	36	return $this->getPrivateKey()->getPublicKey();
185		} else {
186		/** @var PublicKeyInterface $key */
187	27	$key = $this->key;
188	27	return $key;
189		}
190		}
191
192		/**
193		* @return HierarchicalKey
194		*/
195	21	public function withoutPrivateKey(): HierarchicalKey
196		{
197	21	$clone = clone $this;
198	21	$clone->key = $clone->getPublicKey();
199	21	return $clone;
200		}
201
202		/**
203		* @param ScriptDataFactory $factory
204		* @return HierarchicalKey
205		*/
206	1	public function withScriptFactory(ScriptDataFactory $factory)
207		{
208	1	$clone = clone $this;
209	1	$clone->scriptDataFactory = $factory;
210	1	return $clone;
211		}
212
213		/**
214		* @return ScriptDataFactory
215		*/
216	24	public function getScriptDataFactory()
217		{
218	24	return $this->scriptDataFactory;
219		}
220
221		/**
222		* @return \BitWasp\Bitcoin\Key\KeyToScript\ScriptAndSignData
223		*/
224	19	public function getScriptAndSignData()
225		{
226	19	if (null === $this->scriptAndSignData) {
227	19	$this->scriptAndSignData = $this->scriptDataFactory->convertKey($this->key);
228		}
229
230	19	return $this->scriptAndSignData;
231		}
232
233		/**
234		* @param BaseAddressCreator $addressCreator
235		* @return \BitWasp\Bitcoin\Address\Address
236		*/
237	13	public function getAddress(BaseAddressCreator $addressCreator)
238		{
239	13	return $this->getScriptAndSignData()->getAddress($addressCreator);
240		}
241
242		/**
243		* Return whether this is a private key
244		*
245		* @return bool
246		*/
247	48	public function isPrivate(): bool
248		{
249	48	return $this->key->isPrivate();
250		}
251
252		/**
253		* Return whether the key is hardened
254		*
255		* @return bool
256		*/
257	2	public function isHardened(): bool
258		{
259	2	return ($this->sequence >> 31) === 1;
260		}
261
262		/**
263		* Create a buffer containing data to be hashed hashed to yield the child offset
264		*
265		* @param int $sequence
266		* @return BufferInterface
267		* @throws \Exception
268		*/
269	39	public function getHmacSeed(int $sequence): BufferInterface
270		{
271	39	if ($sequence < 0 \|\| $sequence > IntRange::U32_MAX) {
272	6	throw new \InvalidArgumentException("Sequence is outside valid range, must be >= 0 && <= (2^31)-1");
273		}
274
275	33	if (($sequence >> 31) === 1) {
276	30	if ($this->isPrivate() === false) {
277	2	throw new \Exception("Can't derive a hardened key without the private key");
278		}
279
280	28	$data = "\x00{$this->getPrivateKey()->getBinary()}";
281		} else {
282	31	$data = $this->getPublicKey()->getBinary();
283		}
284
285	31	return new Buffer($data . pack("N", $sequence));
286		}
287
288		/**
289		* Derive a child key
290		*
291		* @param int $sequence
292		* @return HierarchicalKey
293		* @throws \Exception
294		*/
295	36	public function deriveChild(int $sequence): HierarchicalKey
296		{
297	36	$nextDepth = $this->depth + 1;
298	36	if ($nextDepth > 255) {
299		throw new \InvalidArgumentException('Invalid depth for BIP32 key, cannot exceed 255');
300		}
301
302	36	$hash = Hash::hmac('sha512', $this->getHmacSeed($sequence), $this->chainCode);
303	31	$offset = $hash->slice(0, 32);
304	31	$chain = $hash->slice(32);
305
306	31	if (false === $this->ecAdapter->validatePrivateKey($offset)) {
307	1	return $this->deriveChild($sequence + 1);
308		}
309
310	31	$key = $this->isPrivate() ? $this->getPrivateKey() : $this->getPublicKey();
311	31	$key = $key->tweakAdd($offset->getGmp());
312
313	31	return new HierarchicalKey(
314	31	$this->ecAdapter,
315	31	$this->scriptDataFactory,
316	31	$nextDepth,
317	31	$this->getChildFingerprint(),
318	31	$sequence,
319	31	$chain,
320	31	$key
321		);
322		}
323
324		/**
325		* @param array\|\stdClass\|\Traversable $list
326		* @return HierarchicalKey
327		* @throws \Exception
328		*/
329	26	public function deriveFromList($list): HierarchicalKey
330		{
331	26	if (!is_array($list) && !$list instanceof \Traversable && !$list instanceof \stdClass) {
332		throw new \InvalidArgumentException('List must be an array or \Traversable');
333		}
334
335	26	$key = $this;
336	26	foreach ($list as $sequence) {
		0 ignored issues – show Bug introduced 2015-11-30 20:43 UTC by Report Bug Copy Issue Report The expression `$list` of type `array\|object<Traversable>\|object<stdClass>` is not guaranteed to be traversable. How about adding an additional type check? There are different options of fixing this problem. If you want to be on the safe side, you can add an additional type-check: $collection = json_decode($data, true); if ( ! is_array($collection)) { throw new \RuntimeException('$collection must be an array.'); } foreach ($collection as $item) { /** ... / } If you are sure that the expression is traversable, you might want to add a doc comment cast* to improve IDE auto-completion and static analysis: /** @var array $collection / $collection = json_decode($data, true); foreach ($collection as $item) { /* .. / } Mark the issue as a false-positive*: Just hover the remove button, in the top-right corner of this issue for more options. Loading history...
337	26	$key = $key->deriveChild((int) $sequence);
338		}
339
340	26	return $key;
341		}
342
343		/**
344		* Decodes a BIP32 path into actual 32bit sequence numbers and derives the child key
345		*
346		* @param string $path
347		* @return HierarchicalKey
348		* @throws \Exception
349		*/
350	26	public function derivePath(string $path): HierarchicalKey
351		{
352	26	$sequences = new HierarchicalKeySequence();
353	26	return $this->deriveFromList($sequences->decodePath($path));
354		}
355
356		/**
357		* Serializes the instance according to whether it wraps a private or public key.
358		* @param NetworkInterface $network
359		* @return string
360		*/
361	16	public function toExtendedKey(NetworkInterface $network = null): string
362		{
363	16	$network = $network ?: Bitcoin::getNetwork();
364
365	16	$extendedSerializer = new Base58ExtendedKeySerializer(new ExtendedKeySerializer($this->ecAdapter));
366	16	$extended = $extendedSerializer->serialize($network, $this);
367	16	return $extended;
368		}
369
370		/**
371		* Explicitly serialize as a private key. Throws an exception if
372		* the key isn't private.
373		*
374		* @param NetworkInterface $network
375		* @return string
376		*/
377	16	public function toExtendedPrivateKey(NetworkInterface $network = null): string
378		{
379	16	if (!$this->isPrivate()) {
380	2	throw new \LogicException('Cannot create extended private key from public');
381		}
382
383	14	return $this->toExtendedKey($network);
384		}
385
386		/**
387		* Explicitly serialize as a public key. This will always work.
388		*
389		* @param NetworkInterface $network
390		* @return string
391		*/
392	13	public function toExtendedPublicKey(NetworkInterface $network = null): string
393		{
394	13	return $this->withoutPrivateKey()->toExtendedKey($network);
395		}
396		}
397

Bit-Wasp / bitcoin-php

Pull Request — master (#662)

HierarchicalKey::derivePath() A

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