Bcrypt-PBKDF Key Derivation Function

Bcrypt-PBKDF2 is a non-standard key derivation function used in OpenSSH for decrypting local SSH keys. It uses elements of both PBKDF2 and Bcrypt, namely it uses Bcrypt as a base hash and loops it back into itself as done in PBKDF2, additionally some other parts are tweaked such as the length of the hash generated by Bcrypt.

This online tool allows you to use the Bcrypt-PBKDF Key Derivation Function.