如何在BASH中对md5和base64进行编码?

I need to encode md5 hash to base 64. The problem is that if give output of md5sum command to base64 command, it is considered as a text and not as a hexadecimal data. How to manage it? Base64 command has no option to set it's input as a hexadecimal number.I need to encode md5 hash to base 64. The probl