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srp: compute K = H(S) correctly. #166

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srp: compute K = H(S) correctly. #166

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Commits on Apr 8, 2024

  1. srp: compute K = H(S) correctly. 

    According to [the specification] section _The SRP protocol_, `K` (which corresponds
to the session key) is computed as follows:

```
K = H(S)
```

where `H` is the digest algorithm, and `S` is the common exponential value.

In the [current implementation], `K` is equal to `S`, which does not follow
the SRP protocol specification.

This commit fixes this issue by computing the right value for `K`.

[the specification]: http://srp.stanford.edu/ndss.html#SECTION00032200000000000000
[current implementation]: https://github.com/RustCrypto/PAKEs/blob/8e46d6bfa24d44e6671616d730e978157b2b23e3/srp/src/client.rs#L211
    @zadlg
    zadlg committed Apr 8, 2024
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