openssl_encrypt中aes-128-cbc、aes-256-cbc中的128、256是与秘钥位数有关的,16位秘钥需要使用aes-128-cbc模式

      $len_key = strlen($sKey);
		if ($len_key <= 16){
			return openssl_decrypt($sStr, 'AES-128-ECB', $sKey, 0, $iv);
		} elseif ($len_key > 16 && $len_key <= 24) {
			return openssl_decrypt($sStr, 'AES-192-ECB', $sKey, 0, $iv);
		} else {
			return openssl_decrypt($sStr, 'AES-256-ECB', $sKey, 0, $iv);
		}

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