Is it possible to get a private key from certificate which issued with "GostR3410-2001-CryptoPro-A" standard and by an external cryptographic service provider to generate a digital signature with "ECGOST3410" algorithm?
I already have that type of certificate including the private key in a pfx file type.
How can I import it into a JKC and get the private key to generate a digital signature using ECGOST3410_2012Signer in bouncycastle?