4be48ecb1b
Verifying signatures does not require any randomness, but requires the user to create a `Secp256k1` object nonetheless (this is just a way to guarantee that `init` is called --- an alternate API would be to have an independent unsafe `verify` function). If a Rng can't be created, rather than failing the `Secp256k1` initialization, fail the functions that actually try to use the Rng. This way signing and verifying, which require no randomness beyond that input to them, will work correctly. To avoid checking for a working Rng on each call to `generate_keypair` and `generate_nonce` (which is probably trivial next to the cost of actually generating the randomness, but w/e, user knows best), the user should use the generation functions in the `key` module, which take an Rng as input. |
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