updated-packages

vendor/lcobucci/jwt/src/Signer/Ecdsa/MultibyteStringConverter.php

@@ -0,0 +1,134 @@
+<?php
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2014-2018 Spomky-Labs
+ *
+ * This software may be modified and distributed under the terms
+ * of the MIT license.  See the LICENSE file for details.
+ *
+ * @link https://github.com/web-token/jwt-framework/blob/v1.2/src/Component/Core/Util/ECSignature.php
+ */
+namespace Lcobucci\JWT\Signer\Ecdsa;
+
+use InvalidArgumentException;
+use function bin2hex;
+use function dechex;
+use function hex2bin;
+use function hexdec;
+use function mb_strlen;
+use function mb_substr;
+use function str_pad;
+use const STR_PAD_LEFT;
+
+/**
+ * ECDSA signature converter using ext-mbstring
+ *
+ * @internal
+ */
+final class MultibyteStringConverter implements SignatureConverter
+{
+    const ASN1_SEQUENCE          = '30';
+    const ASN1_INTEGER           = '02';
+    const ASN1_MAX_SINGLE_BYTE   = 128;
+    const ASN1_LENGTH_2BYTES     = '81';
+    const ASN1_BIG_INTEGER_LIMIT = '7f';
+    const ASN1_NEGATIVE_INTEGER  = '00';
+    const BYTE_SIZE              = 2;
+
+    public function toAsn1($signature, $length)
+    {
+        $signature = bin2hex($signature);
+
+        if (self::octetLength($signature) !== $length) {
+            throw new InvalidArgumentException('Invalid signature length.');
+        }
+
+        $pointR = self::preparePositiveInteger(mb_substr($signature, 0, $length, '8bit'));
+        $pointS = self::preparePositiveInteger(mb_substr($signature, $length, null, '8bit'));
+
+        $lengthR = self::octetLength($pointR);
+        $lengthS = self::octetLength($pointS);
+
+        $totalLength  = $lengthR + $lengthS + self::BYTE_SIZE + self::BYTE_SIZE;
+        $lengthPrefix = $totalLength > self::ASN1_MAX_SINGLE_BYTE ? self::ASN1_LENGTH_2BYTES : '';
+
+        $asn1 = hex2bin(
+            self::ASN1_SEQUENCE
+            . $lengthPrefix . dechex($totalLength)
+            . self::ASN1_INTEGER . dechex($lengthR) . $pointR
+            . self::ASN1_INTEGER . dechex($lengthS) . $pointS
+        );
+
+        return $asn1;
+    }
+
+    private static function octetLength($data)
+    {
+        return (int) (mb_strlen($data, '8bit') / self::BYTE_SIZE);
+    }
+
+    private static function preparePositiveInteger($data)
+    {
+        if (mb_substr($data, 0, self::BYTE_SIZE, '8bit') > self::ASN1_BIG_INTEGER_LIMIT) {
+            return self::ASN1_NEGATIVE_INTEGER . $data;
+        }
+
+        while (mb_substr($data, 0, self::BYTE_SIZE, '8bit') === self::ASN1_NEGATIVE_INTEGER
+            && mb_substr($data, 2, self::BYTE_SIZE, '8bit') <= self::ASN1_BIG_INTEGER_LIMIT) {
+            $data = mb_substr($data, 2, null, '8bit');
+        }
+
+        return $data;
+    }
+
+    public function fromAsn1($signature, $length)
+    {
+        $message  = bin2hex($signature);
+        $position = 0;
+
+        if (self::readAsn1Content($message, $position, self::BYTE_SIZE) !== self::ASN1_SEQUENCE) {
+            throw new InvalidArgumentException('Invalid data. Should start with a sequence.');
+        }
+
+        if (self::readAsn1Content($message, $position, self::BYTE_SIZE) === self::ASN1_LENGTH_2BYTES) {
+            $position += self::BYTE_SIZE;
+        }
+
+        $pointR = self::retrievePositiveInteger(self::readAsn1Integer($message, $position));
+        $pointS = self::retrievePositiveInteger(self::readAsn1Integer($message, $position));
+
+        $points = hex2bin(str_pad($pointR, $length, '0', STR_PAD_LEFT) . str_pad($pointS, $length, '0', STR_PAD_LEFT));
+
+        return $points;
+    }
+
+    private static function readAsn1Content($message, &$position, $length)
+    {
+        $content   = mb_substr($message, $position, $length, '8bit');
+        $position += $length;
+
+        return $content;
+    }
+
+    private static function readAsn1Integer($message, &$position)
+    {
+        if (self::readAsn1Content($message, $position, self::BYTE_SIZE) !== self::ASN1_INTEGER) {
+            throw new InvalidArgumentException('Invalid data. Should contain an integer.');
+        }
+
+        $length = (int) hexdec(self::readAsn1Content($message, $position, self::BYTE_SIZE));
+
+        return self::readAsn1Content($message, $position, $length * self::BYTE_SIZE);
+    }
+
+    private static function retrievePositiveInteger($data)
+    {
+        while (mb_substr($data, 0, self::BYTE_SIZE, '8bit') === self::ASN1_NEGATIVE_INTEGER
+            && mb_substr($data, 2, self::BYTE_SIZE, '8bit') > self::ASN1_BIG_INTEGER_LIMIT) {
+            $data = mb_substr($data, 2, null, '8bit');
+        }
+
+        return $data;
+    }
+}