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    SHA is used in the signing and integrity checking in SSL. Commented Nov 29, 2011 at 12:55
  • It can be used, you choose a cipher suite (consisting of authentication algorithm, hashing algorithm and encryption algorithm) prior to key exchange. You could also choose MD5 if the server supports it. Commented Nov 29, 2011 at 13:03
  • well, no CA in their right name would use that on their certs now though, right? ;) Yes, I'm just pointing out you kind of missed half the question all about hashing! Commented Nov 29, 2011 at 13:14
  • 3
    I didn't miss anything. The question was how is SHA used in RSA. THe answer is, it isn't. I'm not giving a conclusive list of all the possible uses of cryptograhpic algorithms. Also, CA's using MD5 in their certificates is not the same as servers and clients using MD5 in their SSL session negotiation. You can use MD5 in the latter with a SHA-1 certificate. Commented Nov 29, 2011 at 13:40
  • 1
    PGP != RSA, DSA or El Gamal Commented Nov 29, 2011 at 15:29