first commit

2025-11-28 10:08:12 +08:00
commit 09a14bf0a3
1088 changed files with 145132 additions and 0 deletions
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+<?php
+
+namespace WeChatPay;
+
+class RsaTool
+{
+    /**
+     * @var string - Equal to `sequence(oid(1.2.840.113549.1.1.1), null))`
+     * @link https://datatracker.ietf.org/doc/html/rfc3447#appendix-A.2
+     */
+    private const ASN1_OID_RSAENCRYPTION = '300d06092a864886f70d0101010500';
+    private const ASN1_SEQUENCE = 48;
+    private const CHR_NUL = "\0";
+    private const CHR_ETX = "\3";
+
+    /**
+     * Translate the \$thing strlen from `X690` style to the `ASN.1` 128bit hexadecimal length string
+     *
+     * @param string $thing - The string
+     *
+     * @return string The `ASN.1` 128bit hexadecimal length string
+     */
+    private static function encodeLength(string $thing): string
+    {
+        $num = strlen($thing);
+        if ($num <= 0x7F) {
+            return sprintf('%c', $num);
+        }
+
+        $tmp = ltrim(pack('N', $num), self::CHR_NUL);
+        return pack('Ca*', strlen($tmp) | 0x80, $tmp);
+    }
+
+    /**
+     * Convert the `PKCS#1` format RSA Public Key to `SPKI` format
+     *
+     * @param string $thing - The base64-encoded string, without evelope style
+     *
+     * @return string The `SPKI` style public key without evelope string
+     */
+    public static function pkcs1ToSpki(string $thing): string
+    {
+        $raw = self::CHR_NUL . base64_decode($thing);
+        $new = pack('H*', self::ASN1_OID_RSAENCRYPTION) . self::CHR_ETX . self::encodeLength($raw) . $raw;
+
+        return base64_encode(pack('Ca*a*', self::ASN1_SEQUENCE, self::encodeLength($new), $new));
+    }
+
+    public static function pemToBase64(string $data): string
+    {
+        $line = explode("\n", $data);
+        $base64 = '';
+        foreach($line as $row){
+            if(empty($row) || strpos($row, '-----BEGIN')!==false || strpos($row, '-----END')!==false) continue;
+            $base64 .= trim($row);
+        }
+        return $base64;
+    }
+    
+    public static function base64ToPem(string $data, $type): string
+    {
+        if(empty($data) || strpos($data, '-----BEGIN')!==false) return $data;
+        $pem = "-----BEGIN ".$type."-----\n" .
+            wordwrap($data, 64, "\n", true) .
+            "\n-----END ".$type."-----";
+        return $pem;
+    }
+
+    public static function pkcs1ToSpkiPem(string $thing): string
+    {
+        $raw = self::pemToBase64($thing);
+        $new = self::pkcs1ToSpki($raw);
+        return self::base64ToPem($new, 'PUBLIC KEY');
+    }
+}