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<?php |
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declare(strict_types=1); |
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namespace BitWasp\Bitcoin; |
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use BitWasp\Bitcoin\Crypto\Hash; |
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use BitWasp\Bitcoin\Exceptions\Base58ChecksumFailure; |
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use BitWasp\Bitcoin\Exceptions\Base58InvalidCharacter; |
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use BitWasp\Buffertools\Buffer; |
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use BitWasp\Buffertools\BufferInterface; |
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use BitWasp\Buffertools\Buffertools; |
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class Base58 |
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{ |
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/** |
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* @var string |
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*/ |
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private static $base58chars = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'; |
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/** |
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* Encode a given hex string in base58 |
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* |
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* @param BufferInterface $buffer |
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* @return string |
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*/ |
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public static function encode(BufferInterface $buffer): string |
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{ |
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$size = $buffer->getSize(); |
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if ($size === 0) { |
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1 |
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return ''; |
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} |
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$orig = $buffer->getBinary(); |
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$decimal = $buffer->getGmp(); |
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$return = ''; |
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$zero = gmp_init(0); |
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$_58 = gmp_init(58); |
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while (gmp_cmp($decimal, $zero) > 0) { |
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$div = gmp_div($decimal, $_58); |
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$rem = gmp_sub($decimal, gmp_mul($div, $_58)); |
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$return .= self::$base58chars[(int) gmp_strval($rem, 10)]; |
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$decimal = $div; |
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} |
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$return = strrev($return); |
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// Leading zeros |
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for ($i = 0; $i < $size && $orig[$i] === "\x00"; $i++) { |
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$return = '1' . $return; |
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} |
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return $return; |
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} |
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/** |
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* Decode a base58 string |
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* @param string $base58 |
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* @return BufferInterface |
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* @throws Base58InvalidCharacter |
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*/ |
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public static function decode(string $base58): BufferInterface |
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{ |
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if ($base58 === '') { |
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return new Buffer('', 0); |
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} |
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$original = $base58; |
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$length = strlen($base58); |
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$return = gmp_init(0); |
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$_58 = gmp_init(58); |
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for ($i = 0; $i < $length; $i++) { |
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$loc = strpos(self::$base58chars, $base58[$i]); |
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if ($loc === false) { |
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throw new Base58InvalidCharacter('Found character that is not allowed in base58: ' . $base58[$i]); |
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} |
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$return = gmp_add(gmp_mul($return, $_58), gmp_init($loc, 10)); |
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} |
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$binary = gmp_cmp($return, gmp_init(0)) === 0 ? '' : Buffer::int(gmp_strval($return, 10))->getBinary(); |
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for ($i = 0; $i < $length && $original[$i] === '1'; $i++) { |
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$binary = "\x00" . $binary; |
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} |
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return new Buffer($binary); |
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} |
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/** |
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* @param BufferInterface $data |
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* @return BufferInterface |
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*/ |
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public static function checksum(BufferInterface $data): BufferInterface |
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{ |
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return Hash::sha256d($data)->slice(0, 4); |
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} |
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/** |
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* Decode a base58 checksum string and validate checksum |
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* @param string $base58 |
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* @return BufferInterface |
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* @throws Base58ChecksumFailure |
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* @throws Base58InvalidCharacter |
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* @throws \Exception |
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*/ |
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public static function decodeCheck(string $base58): BufferInterface |
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{ |
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$decoded = self::decode($base58); |
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$checksumLength = 4; |
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if ($decoded->getSize() < $checksumLength) { |
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throw new Base58ChecksumFailure("Missing base58 checksum"); |
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} |
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$data = $decoded->slice(0, -$checksumLength); |
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$csVerify = $decoded->slice(-$checksumLength); |
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if (!hash_equals(self::checksum($data)->getBinary(), $csVerify->getBinary())) { |
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throw new Base58ChecksumFailure('Failed to verify checksum'); |
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} |
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return $data; |
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} |
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/** |
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* Encode the given data in base58, with a checksum to check integrity. |
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* |
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* @param BufferInterface $data |
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* @return string |
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*/ |
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public static function encodeCheck(BufferInterface $data): string |
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{ |
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return self::encode(Buffertools::concat($data, self::checksum($data))); |
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} |
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} |
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Bit-Wasp /
bitcoin-php
