javax.crypto.BadPaddingException: Given final block not properly padded

加密算法：BASE64 (3DES (SHA1(原始字符串）））

public static String base64Encode(byte[] str)
{
BASE64Encoder encoder = new BASE64Encoder();
return encoder.encodeBuffer(str);
}

public static byte[] base64Decode(String str)
{
BASE64Decoder dec = new BASE64Decoder();
try
{
return dec.decodeBuffer(str); // 如果这里返回的是dec.decodeBuffer(str).toString() 那么在3DES解密时会报标题的错误
}
catch (IOException io)
{
throw new RuntimeException(io.getMessage(), io.getCause());
}
}