Merge pull request #158 from sc0Vu/fix-150

Add toChecksumAddress in Utils.php

src/Utils.php

@@ -212,6 +212,31 @@ class Utils
         return true;
     }
 
+    /**
+     * toChecksumAddress
+     *
+     * @param string $value
+     * @return string
+     */
+    public static function toChecksumAddress($value)
+    {
+        if (!is_string($value)) {
+            throw new InvalidArgumentException('The value to toChecksumAddress function must be string.');
+        }
+        $value = self::stripZero(strtolower($value));
+        $hash = self::stripZero(self::sha3($value));
+        $ret = '0x';
+
+        for ($i = 0; $i < 40; $i++) {
+            if (intval($hash[$i], 16) >= 8) {
+                $ret .= strtoupper($value[$i]);
+            } else {
+                $ret .= $value[$i];
+            }
+        }
+        return $ret;
+    }
+
     /**
      * isHex
      * 

test/unit/UtilsTest.php

@@ -291,6 +291,33 @@ class UtilsTest extends TestCase
         $isAddressChecksum = Utils::isAddressChecksum(new stdClass);
     }
 
+    /**
+     * testToChecksumAddress
+     *
+     * @return void
+     */
+    public function testToChecksumAddress()
+    {
+        $checksumAddressTest = [
+            // All caps
+            '0x52908400098527886E0F7030069857D2E4169EE7',
+            '0x8617E340B3D01FA5F11F306F4090FD50E238070D',
+            // All Lower
+            '0xde709f2102306220921060314715629080e2fb77',
+            '0x27b1fdb04752bbc536007a920d24acb045561c26',
+            // Normal
+            '0x5aAeb6053F3E94C9b9A09f33669435E7Ef1BeAed',
+            '0xfB6916095ca1df60bB79Ce92cE3Ea74c37c5d359',
+            '0xdbF03B407c01E7cD3CBea99509d93f8DDDC8C6FB',
+            '0xD1220A0cf47c7B9Be7A2E6BA89F429762e7b9aDb'
+        ];
+
+        for ($i=0; $i<count($checksumAddressTest); $i++) {
+            $checksumAddress = Utils::toChecksumAddress(strtolower($checksumAddressTest[$i]));
+            $this->assertEquals($checksumAddressTest[$i], $checksumAddress);
+        }
+    }
+
     /**
      * testStripZero
      *