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chore: use crypto-bigint instead of ursa #207

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berendsliedrecht
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@berendsliedrecht berendsliedrecht commented May 17, 2023

closes #202
partially resolves #203

})?))
impl From<&str> for LinkSecret {
fn from(value: &str) -> Self {
Self(U256::from_be_hex(value))
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This will panic on bad input, which doesn't seem ideal. I've been decoding the hex to bytes and using U256::from_be_slice but crypto-bigint could use fallible methods for this.

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@andrewwhitehead I have been running into some small issues between converting a U256 bigint to an ursa master secret.

Right now, I am doing quite a hacky way of serializing a link_secret, U256, into json and deserializing it into a master_secret, openssl bignum. Openssls bignum in JSON is represented as a decimal, but the U256 defaults to lower_le_hex.

Do you know of a way to fix this? There are some libraries which can convert between hex strings and decimal strings, which might be fine for now as this is a very temporary solution, but I might be missing some better conversion.

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Added a PR for decimal support, although it might still need some changes: RustCrypto/crypto-bigint#246

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@andrewwhitehead #237 makes this redundant, correct?

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Yep I don't think it's needed.

@berendsliedrecht berendsliedrecht deleted the use-big-num branch August 21, 2023 16:33
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Zeroing the Link Secret
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