Script::witnessSigOps() - Code Metrics - Inspection of "TransactionInterface: add getBaseSerialization & g..." - Bit-Wasp/bitcoin-php - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#446)

by thomas

created 2017-01-20 13:09 UTC

Script::witnessSigOps() B

↳ Parent: Script

Complexity

Conditions	5
Paths	4

Size

Total Lines	16
Code Lines	9

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	6
CRAP Score	5.9256

Importance

Changes

Metric	Value
cc	5
eloc	9
nc	4
nop	2
dl	0
loc	16
ccs	6
cts	9
cp	0.6667
crap	5.9256
rs	8.8571
c	0
b	0
f	0

<?php

namespace BitWasp\Bitcoin\Script;

use BitWasp\Bitcoin\Bitcoin;
use BitWasp\Bitcoin\Crypto\Hash;
use BitWasp\Bitcoin\Script\Classifier\OutputClassifier;
use BitWasp\Bitcoin\Script\Interpreter\InterpreterInterface;
use BitWasp\Bitcoin\Script\Parser\Parser;
use BitWasp\Bitcoin\Serializable;
use BitWasp\Buffertools\Buffer;
use BitWasp\Buffertools\BufferInterface;

class Script extends Serializable implements ScriptInterface
{

    /**
     * @var Opcodes
     */
    protected $opCodes;

    /**
     * @var string
     */
    protected $script;

    /**
     * @param BufferInterface $script
     * @param Opcodes|null $opCodes
     */
    public function __construct(BufferInterface $script = null, Opcodes $opCodes = null)
    {
        $this->script = $script instanceof BufferInterface ? $script->getBinary() : '';
        $this->opCodes = $opCodes ?: new Opcodes();
    }

    /**
     * @return BufferInterface
     */
    public function getBuffer()
    {
        return new Buffer($this->script);
    }

    /**
     * @return Parser
     */
    public function getScriptParser()
    {
        return new Parser(Bitcoin::getMath(), $this);
    }

    /**
     * Get all opcodes
     *
     * @return Opcodes
     */
    public function getOpCodes()
    {
        return $this->opCodes;
    }

    /**
     * Return a buffer containing the hash of this script.
     *
     * @return BufferInterface
     */
    public function getScriptHash()
    {
        return Hash::sha256ripe160($this->getBuffer());
    }

    /**
     * @return BufferInterface
     */
    public function getWitnessScriptHash()
    {
        return Hash::sha256($this->getBuffer());
    }

    /**
     * @param bool|true $accurate
     * @return int
     */
    public function countSigOps($accurate = true)
    {
        $count = 0;
        $parser = $this->getScriptParser();

        $lastOp = 0xff;
        try {
            foreach ($parser as $exec) {
                $op = $exec->getOp();

                // None of these are pushdatas, so just an opcode
                if ($op === Opcodes::OP_CHECKSIG || $op === Opcodes::OP_CHECKSIGVERIFY) {
                    $count++;
                } elseif ($op === Opcodes::OP_CHECKMULTISIG || $op === Opcodes::OP_CHECKMULTISIGVERIFY) {
                    if ($accurate && ($lastOp >= Opcodes::OP_1 && $lastOp <= Opcodes::OP_16)) {
                        $count += decodeOpN($lastOp);
                    } else {
                        $count += 20;
                    }
                }

                $lastOp = $op;
            }
        } catch (\Exception $e) {
            /* Script parsing failures don't count, and terminate the loop */
        }

        return $count;
    }

    /**
     * @param WitnessProgram $program
     * @param ScriptWitnessInterface $scriptWitness
     * @return int
     */
    private function witnessSigOps(WitnessProgram $program, ScriptWitnessInterface $scriptWitness)
    {
        if ($program->getVersion() === 0) {
            $size = $program->getProgram()->getSize();
            if ($size === 32 && count($scriptWitness) > 0) {
                $script = new Script($scriptWitness->bottom());
                return $script->countSigOps(true);
            }

            if ($size === 20) {
                return 1;
            }
        }

        return 0;
    }

    /**
     * @param ScriptInterface $scriptSig
     * @param ScriptWitnessInterface $scriptWitness
     * @param int $flags
     * @return int
     */
    public function countWitnessSigOps(ScriptInterface $scriptSig, ScriptWitnessInterface $scriptWitness, $flags)
    {
        if ($flags & InterpreterInterface::VERIFY_WITNESS === 0) {
            return 0;
        }

        $program = null;
        if ($this->isWitness($program)) {
            /** @var WitnessProgram $program */
            return $this->witnessSigOps($program, $scriptWitness);
        }

        if ((new OutputClassifier())->isPayToScriptHash($this)) {
            $parsed = $scriptSig->getScriptParser()->decode();
            $subscript = new Script(end($parsed)->getData());
            if ($subscript->isWitness($program)) {
                /** @var WitnessProgram $program */
                return $this->witnessSigOps($program, $scriptWitness);
            }
        }

        return 0;
    }

    /**
     * @param ScriptInterface $scriptSig
     * @return int
     */
    public function countP2shSigOps(ScriptInterface $scriptSig)
    {
        if (!(new OutputClassifier())->isPayToScriptHash($this)) {
            return $this->countSigOps(true);
        }

        try {
            $data = null;
            foreach ($scriptSig->getScriptParser() as $exec) {
                if ($exec->getOp() > Opcodes::OP_16) {
                    return 0;
                }

                if ($exec->isPush()) {
                    $data = $exec->getData();
                }
            }

            if (!$data instanceof BufferInterface) {
                return 0;
            }

            return (new Script($data))->countSigOps(true);
        } catch (\Exception $e) {
            return 0;
        }
    }

    /**
     * @return bool
     */
    public function isPushOnly()
    {
        foreach ($this->getScriptParser()->decode() as $entity) {
            if ($entity->getOp() > Opcodes::OP_16) {
                return false;
            }
        }

        return true;
    }

    /**
     * @param WitnessProgram|null $program
     * @return bool
     */
    public function isWitness(& $program = null)
    {
        $buffer = $this->getBuffer();
        $size = $buffer->getSize();
        if ($size < 4 || $size > 34) {
            return false;
        }

        $script = $this->getScriptParser()->decode();
        if (!isset($script[0]) || !isset($script[1])) {
            return false;
        }

        $version = $script[0]->getOp();
        if ($version !== Opcodes::OP_0 && ($version < Opcodes::OP_1 || $version > Opcodes::OP_16)) {
            return false;
        }

        $witness = $script[1];
        if ($script[1]->isPush() && $size === $witness->getDataSize() + 2) {
            $program = new WitnessProgram(decodeOpN($version), $witness->getData());
            return true;
        }

        return false;
    }

    /**
     * @param ScriptInterface $script
     * @return bool
     */
    public function equals(ScriptInterface $script)
    {
        return strcmp($this->script, $script->getBinary()) === 0;
    }

    /**
     * @return string
     */
    public function __debugInfo()
    {
        try {
            $decoded = $this->getScriptParser()->getHumanReadable();
        } catch (\Exception $e) {
            $decoded = 'decode failed';
        }
        return [
            'hex' => bin2hex($this->script),
            'asm' => $decoded
        ];
    }
}


1		<?php
2
3		namespace BitWasp\Bitcoin\Script;
4
5		use BitWasp\Bitcoin\Bitcoin;
6		use BitWasp\Bitcoin\Crypto\Hash;
7		use BitWasp\Bitcoin\Script\Classifier\OutputClassifier;
8		use BitWasp\Bitcoin\Script\Interpreter\InterpreterInterface;
9		use BitWasp\Bitcoin\Script\Parser\Parser;
10		use BitWasp\Bitcoin\Serializable;
11		use BitWasp\Buffertools\Buffer;
12		use BitWasp\Buffertools\BufferInterface;
13
14		class Script extends Serializable implements ScriptInterface
15		{
16
17		/**
18		* @var Opcodes
19		*/
20		protected $opCodes;
21
22		/**
23		* @var string
24		*/
25		protected $script;
26
27		/**
28		* @param BufferInterface $script
29		* @param Opcodes\|null $opCodes
30		*/
31	1590	public function __construct(BufferInterface $script = null, Opcodes $opCodes = null)
32		{
33	1590	$this->script = $script instanceof BufferInterface ? $script->getBinary() : '';
34	1590	$this->opCodes = $opCodes ?: new Opcodes();
35	1590	}
36
37		/**
38		* @return BufferInterface
39		*/
40	1602	public function getBuffer()
41		{
42	1602	return new Buffer($this->script);
43		}
44
45		/**
46		* @return Parser
47		*/
48	1446	public function getScriptParser()
49		{
50	1446	return new Parser(Bitcoin::getMath(), $this);
51		}
52
53		/**
54		* Get all opcodes
55		*
56		* @return Opcodes
57		*/
58	6	public function getOpCodes()
59		{
60	6	return $this->opCodes;
61		}
62
63		/**
64		* Return a buffer containing the hash of this script.
65		*
66		* @return BufferInterface
67		*/
68	18	public function getScriptHash()
69		{
70	18	return Hash::sha256ripe160($this->getBuffer());
71		}
72
73		/**
74		* @return BufferInterface
75		*/
76	75	public function getWitnessScriptHash()
77		{
78	75	return Hash::sha256($this->getBuffer());
79		}
80
81		/**
82		* @param bool\|true $accurate
83		* @return int
84		*/
85	18	public function countSigOps($accurate = true)
86		{
87	18	$count = 0;
88	18	$parser = $this->getScriptParser();
89
90	18	$lastOp = 0xff;
91		try {
92	18	foreach ($parser as $exec) {
93	12	$op = $exec->getOp();
94
95		// None of these are pushdatas, so just an opcode
96	12	if ($op === Opcodes::OP_CHECKSIG \|\| $op === Opcodes::OP_CHECKSIGVERIFY) {
97	6	$count++;
98	12	} elseif ($op === Opcodes::OP_CHECKMULTISIG \|\| $op === Opcodes::OP_CHECKMULTISIGVERIFY) {
99	10	if ($accurate && ($lastOp >= Opcodes::OP_1 && $lastOp <= Opcodes::OP_16)) {
100	8	$count += decodeOpN($lastOp);
101		} else {
102	4	$count += 20;
103		}
104		}
105
106	16	$lastOp = $op;
107		}
108	2	} catch (\Exception $e) {
109		/* Script parsing failures don't count, and terminate the loop */
110		}
111
112	18	return $count;
113		}
114
115		/**
116		* @param WitnessProgram $program
117		* @param ScriptWitnessInterface $scriptWitness
118		* @return int
119		*/
120	2	private function witnessSigOps(WitnessProgram $program, ScriptWitnessInterface $scriptWitness)
121		{
122	2	if ($program->getVersion() === 0) {
123	2	$size = $program->getProgram()->getSize();
124	2	if ($size === 32 && count($scriptWitness) > 0) {
125	2	$script = new Script($scriptWitness->bottom());
126	2	return $script->countSigOps(true);
127		}
128
129		if ($size === 20) {
130		return 1;
131		}
132		}
133
134		return 0;
135		}
136
137		/**
138		* @param ScriptInterface $scriptSig
139		* @param ScriptWitnessInterface $scriptWitness
140		* @param int $flags
141		* @return int
142		*/
143	2	public function countWitnessSigOps(ScriptInterface $scriptSig, ScriptWitnessInterface $scriptWitness, $flags)
144		{
145	2	if ($flags & InterpreterInterface::VERIFY_WITNESS === 0) {
146		return 0;
147		}
148
149	2	$program = null;
150	2	if ($this->isWitness($program)) {
151		/** @var WitnessProgram $program */
152	2	return $this->witnessSigOps($program, $scriptWitness);
153		}
154
155		if ((new OutputClassifier())->isPayToScriptHash($this)) {
156		$parsed = $scriptSig->getScriptParser()->decode();
157		$subscript = new Script(end($parsed)->getData());
158		if ($subscript->isWitness($program)) {
159		/** @var WitnessProgram $program */
160		return $this->witnessSigOps($program, $scriptWitness);
161		}
162		}
163
164		return 0;
165		}
166
167		/**
168		* @param ScriptInterface $scriptSig
169		* @return int
170		*/
171	8	public function countP2shSigOps(ScriptInterface $scriptSig)
172		{
173	8	if (!(new OutputClassifier())->isPayToScriptHash($this)) {
174	4	return $this->countSigOps(true);
175		}
176
177		try {
178	8	$data = null;
179	8	foreach ($scriptSig->getScriptParser() as $exec) {
180	8	if ($exec->getOp() > Opcodes::OP_16) {
181	2	return 0;
182		}
183
184	6	if ($exec->isPush()) {
185	6	$data = $exec->getData();
186		}
187		}
188
189	8	if (!$data instanceof BufferInterface) {
190	2	return 0;
191		}
192
193	6	return (new Script($data))->countSigOps(true);
194		} catch (\Exception $e) {
195		return 0;
196		}
197		}
198
199		/**
200		* @return bool
201		*/
202	106	public function isPushOnly()
203		{
204	106	foreach ($this->getScriptParser()->decode() as $entity) {
205	106	if ($entity->getOp() > Opcodes::OP_16) {
206	106	return false;
207		}
208		}
209
210	97	return true;
211		}
212
213		/**
214		* @param WitnessProgram\|null $program
215		* @return bool
216		*/
217	123	public function isWitness(& $program = null)
218		{
219	123	$buffer = $this->getBuffer();
220	123	$size = $buffer->getSize();
221	123	if ($size < 4 \|\| $size > 34) {
222	13	return false;
223		}
224
225	115	$script = $this->getScriptParser()->decode();
226	115	if (!isset($script[0]) \|\| !isset($script[1])) {
227	2	return false;
228		}
229
230	113	$version = $script[0]->getOp();
231	113	if ($version !== Opcodes::OP_0 && ($version < Opcodes::OP_1 \|\| $version > Opcodes::OP_16)) {
232	57	return false;
233		}
234
235	99	$witness = $script[1];
236	99	if ($script[1]->isPush() && $size === $witness->getDataSize() + 2) {
237	97	$program = new WitnessProgram(decodeOpN($version), $witness->getData());
238	97	return true;
239		}
240
241	2	return false;
242		}
243
244		/**
245		* @param ScriptInterface $script
246		* @return bool
247		*/
248	149	public function equals(ScriptInterface $script)
249		{
250	149	return strcmp($this->script, $script->getBinary()) === 0;
251		}
252
253		/**
254		* @return string
255		*/
256	2	public function __debugInfo()
257		{
258		try {
259	2	$decoded = $this->getScriptParser()->getHumanReadable();
260		} catch (\Exception $e) {
261		$decoded = 'decode failed';
262		}
263		return [
264	2	'hex' => bin2hex($this->script),
265	2	'asm' => $decoded
266		];
267		}
268		}
269

Bit-Wasp / bitcoin-php

Pull Request — master (#446)

Script::witnessSigOps() B

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