dkg-evrf crate

monero-oxide relies on ciphersuite, which is in-tree, yet we've made breaking
changes since. This commit adds a patch so
monero-oxide -> patches/ciphersuite -> crypto/ciphersuite, with
patches/ciphersuite resolving the breaking changes.

patches/ciphersuite/Cargo.toml

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+[package]
+name = "ciphersuite"
+version = "0.4.99"
+description = "Ciphersuites built around ff/group"
+license = "MIT"
+repository = "https://github.com/serai-dex/serai/tree/develop/crypto/ciphersuite"
+authors = ["Luke Parker <lukeparker5132@gmail.com>"]
+keywords = ["ciphersuite", "ff", "group"]
+edition = "2021"
+rust-version = "1.66"
+
+[package.metadata.docs.rs]
+all-features = true
+rustdoc-args = ["--cfg", "docsrs"]
+
+[lints]
+workspace = true
+
+[dependencies]
+ciphersuite = { path = "../../crypto/ciphersuite", default-features = false }
+dalek-ff-group = { path = "../../crypto/dalek-ff-group", default-features = false, optional = true }
+
+[features]
+alloc = ["ciphersuite/alloc"]
+std = [
+  "ciphersuite/std",
+  "dalek-ff-group?/std",
+]
+ed25519 = ["dalek-ff-group"]
+default = ["std"]

patches/ciphersuite/LICENSE

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+MIT License
+
+Copyright (c) 2021-2025 Luke Parker
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

patches/ciphersuite/README.md

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+# Ciphersuite
+
+Patch for the `crates.io` ciphersuite to use the in-tree ciphersuite, resolving
+breaking changes made since.

patches/ciphersuite/src/lib.rs

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+#![cfg_attr(not(feature = "std"), no_std)]
+
+pub use ciphersuite::*;
+#[cfg(feature = "ed25519")]
+use dalek_ff_group::Ed25519;