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Dec 18, 2019
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document precompute #178

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Expand Up @@ -329,6 +329,25 @@ sk2 = make_key(b"2-"+seed) # different key
assert sk1a.to_string() != sk2.to_string()
```

In case the application will verify a lot of signatures made with a single
key, it's possible to precompute some of the internal values to make
signature verification significantly faster. The break-even point occurs at
about 100 signatures verified.

To perform precomputation, you can call the `precompute()` method
on `VerifyingKey` instance:
```python
from ecdsa import SigningKey, NIST384p
sk = SigningKey.generate(curve=NIST384p)
vk = sk.verifying_key
vk.precompute()
signature = sk.sign(b"message")
assert vk.verify(signature, b"message")
```

Once `precompute()` was called, all signature verifications with this key will
be faster to execute.

## OpenSSL Compatibility

To produce signatures that can be verified by OpenSSL tools, or to verify
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