How to create an odd length file signature using CAPICOM + JS?

Question

OpenSSL

Knowledgeable people help. I have been unsuccessfully looking for a solution for several months.
When creating a signature using CAPICOM + JS, the signed data is converted to UNICODE (a feature of CAPICOM).
That is, when signing a file of 5 bytes, it is converted into a string of 6 bytes and after that a signature is made.
Accordingly, an attempt to verify the source file and the resulting signature (on the server side using openssl) fails.
If I sign a file of even length, then the check is successful.
What are the ways to solve this problem?