SSF signature using SHA1 and digtal certificate

Hello

I have a requirement that I sign data in an internal table using a certificate  and then append the detached signature to a file which is to be sent to the bank. I have managed to import the certificate and i am signing using ssf_krn_sign, however the bank says the digital signature being produced is too long, its supposed to be 128 characters, we are using SHA1 algorithm BTW.

Regards

Florence