Is there some utils.decode_dss_signature function equivalent in some NodeJS module?

I have to generate an ECDSA sign and decode it after.

I tried with two different forms: one gave me a sign of size 135, while the other gave me a sign with size 70. The first one was generated with a pem key (asn1js and bn modules) and the second was generated with 'raw' key (eccrypto module).

I need to decode my sign to make another operations. Can anyone help me with this?

via Dalton