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Yes, you can and use a slow hashing function when constructing the verifier. I would recommend using PBKDF2, as it is designed for this purpose. In fact, Wikipedia says: $v$ is the host's password verifier, $v = g^x$, $x = H(s,p)$. Using of functions like PBKDF2 instead of $H$ for password hashing is highly recommended. Thus, you could use ...

The point of SRP is to remove the need for the SSL/TLS certificates. With SRP integrated into SSL/TLS (as per RFC 5054), you get mutual client/server password-based authentication and can do without any of the dreadful certificate business; and yet the protocol is still resilient to offline dictionary attacks. If your SSL/TLS still uses a server certificate ...