BIP39 Mnemonic

Mnemonic BIP39 implementation in PHP

Installation

Prerequisite

• PHP ^8.2
• ext-mbstring (MultiByte string PHP ext. for non-english wordlist)

Composer

composer require furqansiddiqui/bip39-mnemonic-php

Generating a Secure Mnemonic

Generate a mnemonic using a secure PRNG implementation.

BIP39::fromRandom

Argument	Type	Description
$wordList	AbstractLanguage	Langage instance for wordlist
$wordCount	int	Number of words (12-24)

Returns instance of Mnemonic class.

Example:

// Generate entropy using PRNG
$mnemonic = \FurqanSiddiqui\BIP39\BIP39::fromRandom(
    \FurqanSiddiqui\BIP39\Language\English::getInstance(),
    wordCount: 12
);

# array(12) { [0]=> string(4) "tape" [1]=> string(8) "solution" ... [10]=> string(6) "border" [11]=> string(6) "sample" }
var_dump($mnemonic->words);
# string(32) "ddd9dbcd1b07a09c16f080637818675f"
var_dump($mnemonic->entropy);

Entropy to Mnemonic

Generate mnemonic codes from given entropy

BIP39::fromRandom

Argument	Type	Description
$entropy	AbstractByteArray	Entropy
$wordList	AbstractLanguage	Langage instance for wordlist

Returns instance of Mnemonic class.

Example:

$mnemonic = \FurqanSiddiqui\BIP39\BIP39::fromEntropy(
    \Charcoal\Buffers\Buffer::fromBase16("ddd9dbcd1b07a09c16f080637818675f"),
    \FurqanSiddiqui\BIP39\Language\English::getInstance()
);

# array(12) { [0]=> string(4) "tape" [1]=> string(8) "solution" ... [10]=> string(6) "border" [11]=> string(6) "sample" }
var_dump($mnemonic->words);

Mnemonic sentence/Words to Mnemonic

Generate entropy from mnemonic codes

BIP39::fromWords

Argument	Type	Description
$words	Array<string>	Array of mnemonic codes
$wordList	AbstractLanguage	Langage instance for wordlist
$verifyChecksum	bool	Defaults to TRUE, computes and verifies checksum as per BIP39 spec.

Returns instance of Mnemonic class.

Example:

$mnemonic = \FurqanSiddiqui\BIP39\BIP39::fromWords(
    ["tape", "solution", "viable", "current", "key",
        "evoke", "forward", "avoid", "gloom", "school", "border", "sample"],
    \FurqanSiddiqui\BIP39\Language\English::getInstance()
);

#string(32) "ddd9dbcd1b07a09c16f080637818675f"
var_dump($mnemonic->entropy);

Mnemonic Class

readonly class Mnemonic

This lib will create this Mnemonic object as a result:

Property	Type	Description
language	string	Language name (as it was passed to constructor of wordlist class)
words	Array<string>	Mnemonic codes
wordsIndex	Array<int>	Position/index # of each mnemonic code corresponding to wordlist used
wordsCount	int	Number of mnemonic codes (i.e. 12, 15, 18, 21 or 24)
entropy	string	Entropy in hexadecimal encoding

Generating Seed with Passphrase

Mnemonic->generateSeed

Generates seed from a mnemonic as per BIP39 specifications.

Argument	Type	Description
$passphrase	string	Defaults to empty string ("")
$bytes	int	Number of bytes to return, defaults to 64.

Returns:

Type	Description
string	Returns computed PBKDF2 hash in RAW BINARY as string

Generate non-english mnemonic codes

Check AbstractLanguage and AbstractLanguageFile classes. English class has all 2048 words pre-loaded instead of reading from a local file every time. To implement other languages or custom set of 2048 words, check ChineseWords.php file in tests directory for example of implementation.

class CustomWords extends \FurqanSiddiqui\BIP39\Language\AbstractLanguageFile
{
    /**
     * @return static
     */
    protected static function constructor(): static
    {
        return new static(
            language: "some_language",
            words: static::wordsFromFile(
                pathToFile: "/path/to/wordlist.txt",
                eolChar: PHP_EOL
            ),
            mbEncoding: "UTF-8"
        );
    }
}

and then use in place of AbstractLanguage where required:

CustomWords::getInstance()

Test Vectors

Include PHPUnit tests for all test vectors mentioned in official BIP-0039 specification. Use following command to execute all tests using phpunit.phar

php phpunit.phar --bootstrap vendor/autoload.php tests/