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extend/RSA.php

@@ -0,0 +1,66 @@
+<?php
+namespace extend;
+
+class RSA
+{
+    /**
+     * 生成秘钥
+     */
+    public static function getSecretKey(){
+        $config = [
+            'digest_alg' => "sha512",
+            'private_key_bits' => 4096,
+            'private_key_type' => OPENSSL_KEYTYPE_RSA,
+        ];
+        
+        $resources = openssl_pkey_new($config);
+        openssl_pkey_export($resources, $private_key, null, $config);
+        $public_key = openssl_pkey_get_details($resources);
+        
+        if (empty($private_key) || empty($public_key)) return error(-1, 'API_SECRET_KEY_CREATE_ERROR');
+        
+        $data = [
+            'public_key' => $public_key['key'],
+            'private_key' => $private_key 
+        ];
+        
+        return success(0, '', $data);
+    }
+    
+    /**
+     * 私钥解密
+     * @param string $encrypted
+     * @param string $private_key
+     */
+    public static function decrypt($encrypted, $private_key, $public_key){
+        $private_check = openssl_pkey_get_private($private_key);
+        if (!$private_check) return error(-1, 'PRIVATE_KEY_ERROR');
+        $public_check = openssl_pkey_get_public($public_key);
+        if (!$public_check) return error(-1, 'PUBLIC_KEY_ERROR');
+        
+        $details = openssl_pkey_get_details($public_check);
+        $bits = $details['bits'];
+        
+        $decrypted = '';
+        $base64_decoded = self::safe_base64_decode($encrypted);
+        // 分段解密
+        $parts = str_split($base64_decoded, ($bits / 8));
+        foreach ($parts as $part) {
+            $decrypted_temp = '';
+            $decrypt_res = openssl_private_decrypt($part, $decrypted_temp, $private_key);
+            if (!$decrypt_res) return error(-1, 'DECRYPT_FAIL');
+            $decrypted .= $decrypted_temp;
+        }
+        
+        return success(0, '', $decrypted);
+    }
+    
+    /**
+     * base64解码
+     * @param unknown $string
+     */
+    private static function safe_base64_decode($string){
+        $base_64 = str_replace(array( '-', '_' ), array( '+', '/' ), $string);
+        return base64_decode($base_64);
+    }
+}