Puttygen windows 7 64 bit

Hi Guys,
I'm trying to setup a SFTP transfer to one of our clients, using winscp, and they are expecting me to send a SHA-1 fingerprint.
I've been playing around with puttygen to create the key pair, but the output always seems to provide a 128bit fingerprint (prefixed ssh-rsa 1023), which I am assuming is an MD5 hash, rather than an 160bit SHA-1 one?
I am using the SSH-2 RSA parameter.
I am getting this completely wrong?
thoughts appreicated!

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