Script::countP2shSigOps() - Code Metrics - Inspection of "Unparsable scripts should be handled during sigop..." - Bit-Wasp/bitcoin-php - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#277)

by thomas

created 2016-03-07 22:37 UTC

Script::countP2shSigOps() C

↳ Parent: Script

Complexity

Conditions	7
Paths	17

Size

Total Lines	27
Code Lines	15

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	13
CRAP Score	7

Importance

Changes	3
Bugs	0	Features	2

Metric	Value
dl	0
loc	27
ccs	13
cts	13
cp	1
rs	6.7272
c	3
b	0
f	2
cc	7
eloc	15
nc	17
nop	1
crap	7

<?php

namespace BitWasp\Bitcoin\Script;

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

    /**
     * @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($this))->isPayToScriptHash()) {
            $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 $scriptSig)
    {
        if (!ScriptFactory::scriptPubKey()->classify($this)->isPayToScriptHash()) {
            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(WitnessProgram & $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;
    }
}


1		<?php
2
3		namespace BitWasp\Bitcoin\Script;
4
5		use BitWasp\Bitcoin\Bitcoin;
6		use BitWasp\Bitcoin\Script\Classifier\OutputClassifier;
7		use BitWasp\Bitcoin\Script\Interpreter\InterpreterInterface;
8		use BitWasp\Bitcoin\Script\Parser\Parser;
9		use BitWasp\Buffertools\Buffer;
10		use BitWasp\Bitcoin\Crypto\Hash;
11		use BitWasp\Bitcoin\Serializable;
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	1656	public function __construct(BufferInterface $script = null, Opcodes $opCodes = null)
32		{
33	1656	$this->script = $script instanceof BufferInterface ? $script->getBinary() : '';
34	1656	$this->opCodes = $opCodes ?: new Opcodes();
35	1656	}
36
37		/**
38		* @return BufferInterface
39		*/
40	1476	public function getBuffer()
41		{
42	1476	return new Buffer($this->script);
43		}
44
45		/**
46		* @return Parser
47		*/
48	1140	public function getScriptParser()
49		{
50	1140	return new Parser(Bitcoin::getMath(), $this);
51		}
52
53		/**
54		* Get all opcodes
55		*
56		* @return Opcodes
57		*/
58	696	public function getOpCodes()
59		{
60	696	return $this->opCodes;
61		}
62
63		/**
64		* Return a buffer containing the hash of this script.
65		*
66		* @return BufferInterface
67		*/
68	156	public function getScriptHash()
69		{
70	156	return Hash::sha256ripe160($this->getBuffer());
71		}
72
73		/**
74		* @param bool\|true $accurate
75		* @return int
76		*/
77	48	public function countSigOps($accurate = true)
78		{
79	48	$count = 0;
80	48	$parser = $this->getScriptParser();
81
82	48	$lastOp = 0xff;
83	48	try {
84	36	foreach ($parser as $exec) {
85		$op = $exec->getOp();
86
87	36	// None of these are pushdatas, so just an opcode
88	18	if ($op === Opcodes::OP_CHECKSIG \|\| $op === Opcodes::OP_CHECKSIGVERIFY) {
89	36	$count++;
90	30	} elseif ($op === Opcodes::OP_CHECKMULTISIG \|\| $op === Opcodes::OP_CHECKMULTISIGVERIFY) {
91	24	if ($accurate && ($lastOp >= Opcodes::OP_1 && $lastOp <= Opcodes::OP_16)) {
92	24	$count += decodeOpN($lastOp);
93	12	} else {
94		$count += 20;
95	30	}
96		}
97	36
98	48	$lastOp = $op;
99		}
100	48	} catch (\Exception $e) {
101		/* Script parsing failures don't count, and terminate the loop */
102		}
103
104		return $count;
105		}
106
107		/**
108		* @param WitnessProgram $program
109		* @param ScriptWitnessInterface $scriptWitness
110		* @return int
111		*/
112		private function witnessSigOps(WitnessProgram $program, ScriptWitnessInterface $scriptWitness)
113		{
114		if ($program->getVersion() == 0) {
115		$size = $program->getProgram()->getSize();
116		if ($size === 32 && count($scriptWitness) > 0) {
117		$script = new Script($scriptWitness->bottom());
118		return $script->countSigOps(true);
119		}
120
121		if ($size === 20) {
122		return 1;
123		}
124		}
125
126		return 0;
127		}
128
129		/**
130		* @param ScriptInterface $scriptSig
131		* @param ScriptWitnessInterface $scriptWitness
132		* @param int $flags
133		* @return int
134		*/
135		public function countWitnessSigOps(ScriptInterface $scriptSig, ScriptWitnessInterface $scriptWitness, $flags)
136		{
137		if ($flags & InterpreterInterface::VERIFY_WITNESS === 0) {
138		return 0;
139		}
140
141		$program = null;
142		if ($this->isWitness($program)) {
143		/** @var WitnessProgram $program */
144		return $this->witnessSigOps($program, $scriptWitness);
145		}
146
147		if ((new OutputClassifier($this))->isPayToScriptHash()) {
148		$parsed = $scriptSig->getScriptParser()->decode();
149		$subscript = new Script(end($parsed)->getData());
150		if ($subscript->isWitness($program)) {
151		/** @var WitnessProgram $program */
152		return $this->witnessSigOps($program, $scriptWitness);
153		}
154		}
155
156		return 0;
157		}
158
159	18	/**
160		* @param ScriptInterface $scriptSig
161	18	* @return int
162	6	*/
163		public function countP2shSigOps(ScriptInterface $scriptSig)
164		{
165	18	if (!ScriptFactory::scriptPubKey()->classify($this)->isPayToScriptHash()) {
166		return $this->countSigOps(true);
167	18	}
168	18
169	18	try {
170	6	$data = null;
171		foreach ($scriptSig->getScriptParser() as $exec) {
172		if ($exec->getOp() > Opcodes::OP_16) {
173	12	return 0;
174	12	}
175	12
176	18	if ($exec->isPush()) {
177		$data = $exec->getData();
178	18	}
179	6	}
180
181		if (!$data instanceof BufferInterface) {
182	12	return 0;
183		}
184
185		return (new Script($data))->countSigOps(true);
186		} catch (\Exception $e) {
187		return 0;
188	138	}
189		}
190	84
191	84	/**
192	12	* @return bool
193		*/
194	138	public function isPushOnly()
195		{
196	72	foreach ($this->getScriptParser()->decode() as $entity) {
197		if ($entity->getOp() > Opcodes::OP_16) {
198		return false;
199		}
200		}
201
202		return true;
203	108	}
204
205	108	/**
206	108	* @param WitnessProgram\|null $program
207	108	* @return bool
208	36	*/
209		public function isWitness(WitnessProgram & $program = null)
210		{
211	84	$buffer = $this->getBuffer();
212	84	$size = $buffer->getSize();
213	6	if ($size < 4 \|\| $size > 34) {
214		return false;
215		}
216	78
217	78	$script = $this->getScriptParser()->decode();
218	42	if (!isset($script[0]) \|\| !isset($script[1])) {
219		return false;
220		}
221	48
222	48	$version = $script[0]->getOp();
223	42	if ($version != Opcodes::OP_0 && ($version < Opcodes::OP_1 \|\| $version > Opcodes::OP_16)) {
224	42	return false;
225		}
226
227	6	$witness = $script[1];
228		if ($script[1]->isPush() && $size === $witness->getDataSize() + 2) {
229		$program = new WitnessProgram(decodeOpN($version), $witness->getData());
230		return true;
231		}
232
233		return false;
234		}
235		}
236

Bit-Wasp / bitcoin-php

Pull Request — master (#277)

Script::countP2shSigOps() C

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