comÃposer add tephenhill/base58

1 files changed, 156 insertions, 0 deletions

diff --git a/vendor/stephenhill/base58/src/GMPService.php b/vendor/stephenhill/base58/src/GMPService.php
new file mode 100644
index 000000000..0dde30594
--- /dev/null
+++ b/vendor/stephenhill/base58/src/GMPService.php
@@ -0,0 +1,156 @@
+<?php
+
+namespace StephenHill;
+
+use InvalidArgumentException;
+
+class GMPService implements ServiceInterface
+{
+    /**
+     * @var string
+     * @since v1.1.0
+     */
+    protected $alphabet;
+
+    /**
+     * @var int
+     * @since v1.1.0
+     */
+    protected $base;
+
+    /**
+     * Constructor
+     *
+     * @param string $alphabet optional
+     * @since v1.1.0
+     */
+    public function __construct($alphabet = null)
+    {
+        // Handle null alphabet
+        if (is_null($alphabet) === true) {
+            $alphabet = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz';
+        }
+
+        // Type validation
+        if (is_string($alphabet) === false) {
+            throw new InvalidArgumentException('Argument $alphabet must be a string.');
+        }
+
+        // The alphabet must contain 58 characters
+        if (strlen($alphabet) !== 58) {
+            throw new InvalidArgumentException('Argument $alphabet must contain 58 characters.');
+        }
+
+        $this->alphabet = $alphabet;
+        $this->base = strlen($alphabet);
+    }
+    /**
+     * Encode a string into base58.
+     *
+     * @param  string $string The string you wish to encode.
+     * @since Release v1.1.0
+     * @return string The Base58 encoded string.
+     */
+    public function encode($string)
+    {
+        // Type validation
+        if (is_string($string) === false) {
+            throw new InvalidArgumentException('Argument $string must be a string.');
+        }
+
+        // If the string is empty, then the encoded string is obviously empty
+        if (strlen($string) === 0) {
+            return '';
+        }
+
+        // Now we need to convert the byte array into an arbitrary-precision decimal
+        // We basically do this by performing a base256 to base10 conversion
+        $hex = unpack('H*', $string);
+        $hex = reset($hex);
+        $decimal = gmp_init($hex, 16);
+
+        // This loop now performs base 10 to base 58 conversion
+        // The remainder or modulo on each loop becomes a base 58 character
+        $output = '';
+        while (gmp_cmp($decimal, $this->base) >= 0) {
+            list($decimal, $mod) = gmp_div_qr($decimal, $this->base);
+            $output .= $this->alphabet[gmp_intval($mod)];
+        }
+
+        // If there's still a remainder, append it
+        if (gmp_cmp($decimal, 0) > 0) {
+            $output .= $this->alphabet[gmp_intval($decimal)];
+        }
+
+        // Now we need to reverse the encoded data
+        $output = strrev($output);
+
+        // Now we need to add leading zeros
+        $bytes = str_split($string);
+        foreach ($bytes as $byte) {
+            if ($byte === "\x00") {
+                $output = $this->alphabet[0] . $output;
+                continue;
+            }
+            break;
+        }
+
+        return (string) $output;
+    }
+
+    /**
+     * Decode base58 into a PHP string.
+     *
+     * @param  string $base58 The base58 encoded string.
+     * @since Release v1.1.0
+     * @return string Returns the decoded string.
+     */
+    public function decode($base58)
+    {
+        // Type Validation
+        if (is_string($base58) === false) {
+            throw new InvalidArgumentException('Argument $base58 must be a string.');
+        }
+
+        // If the string is empty, then the decoded string is obviously empty
+        if (strlen($base58) === 0) {
+            return '';
+        }
+
+        $indexes = array_flip(str_split($this->alphabet));
+        $chars = str_split($base58);
+
+        // Check for invalid characters in the supplied base58 string
+        foreach ($chars as $char) {
+            if (isset($indexes[$char]) === false) {
+                throw new InvalidArgumentException('Argument $base58 contains invalid characters.');
+            }
+        }
+
+        // Convert from base58 to base10
+        $decimal = gmp_init($indexes[$chars[0]], 10);
+
+        for ($i = 1, $l = count($chars); $i < $l; $i++) {
+            $decimal = gmp_mul($decimal, $this->base);
+            $decimal = gmp_add($decimal, $indexes[$chars[$i]]);
+        }
+
+        // Convert from base10 to base256 (8-bit byte array)
+        $output = '';
+        while (gmp_cmp($decimal, 0) > 0) {
+            list($decimal, $byte) = gmp_div_qr($decimal, 256);
+            $output = pack('C', gmp_intval($byte)) . $output;
+        }
+
+        // Now we need to add leading zeros
+        foreach ($chars as $char) {
+            if ($indexes[$char] === 0) {
+                $output = "\x00" . $output;
+                continue;
+            }
+            break;
+        }
+
+        return $output;
+    }
+}