update to work with PSE halo2 0.3.0

- simpify protocol
- rebase on dev
- add mock backend
- fix failing tests
- use dedicated field element for salt

authdecode/Cargo.toml

@@ -0,0 +1,35 @@
+[package]
+name = "authdecode"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+name = "authdecode"
+
+[dependencies]
+thiserror = "1.0.56"
+num = "0.4.1" 
+rand = "0.8.5"
+rand_chacha = "0.3.1"
+sha2 = { version = "0.10.8", features = ["compress"] }
+opaque-debug = "0.3.0"
+mpz-core = { git = "https://github.com/privacy-scaling-explorations/mpz", commit = "499b75d20397235f8399817a53c65fa2d399d3b8"}
+blake3 = "1.3.3"
+serde = "1"
+bincode = "1"
+
+halo2_proofs = { git = "https://github.com/privacy-scaling-explorations/halo2", tag = "v0.3.0", default-features = false}
+halo2_poseidon = { git = "https://github.com/privacy-scaling-explorations/poseidon-gadget", rev="764a682"}
+
+group = "0.13"
+ff = "0.13"
+
+
+[dev-dependencies]
+hex = "0.4.3"
+num-bigint = { version = "0.4.4", features = ["rand"] }
+criterion = "0.5.1"
+rand_chacha = "0.3"
+rand = "0.8"
+rand_core = "0.6"
+rstest = "0.12"