All of our derived types for these algorithms now call the exact same helpers (except maybe DSACryptoServiceProvider, which fails if you ask for something other than SHA-1, because of FIPS 186-2 limitations).

Perhaps instead of re-implementing these methods identically 14 times ({CNG,CSP,OpenSSL,Android,Apple} * {RSA,DSA,ECDSA} - DSACSP)) we should define them just the 3 times.