Add x25519-dalek as dependency

Cargo.lock

@@ -2033,6 +2033,17 @@ dependencies = [
  "winapi-build",
 ]
 
+[[package]]
+name = "x25519-dalek"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "637ff90c9540fa3073bb577e65033069e4bae7c79d49d74aa3ffdf5342a53217"
+dependencies = [
+ "curve25519-dalek",
+ "rand_core 0.5.1",
+ "zeroize",
+]
+
 [[package]]
 name = "yaml-rust"
 version = "0.4.3"
@@ -2061,6 +2072,7 @@ dependencies = [
  "serde",
  "sha2",
  "thiserror",
+ "x25519-dalek",
 ]
 
 [[package]]
@@ -2140,3 +2152,18 @@ name = "zeroize"
 version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3cbac2ed2ba24cc90f5e06485ac8c7c1e5449fe8911aef4d8877218af021a5b8"
+dependencies = [
+ "zeroize_derive",
+]
+
+[[package]]
+name = "zeroize_derive"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "de251eec69fc7c1bc3923403d18ececb929380e016afe103da75f396704f8ca2"
+dependencies = [
+ "proc-macro2 1.0.7",
+ "quote 1.0.2",
+ "syn 1.0.13",
+ "synstructure",
+]

zebra-chain/Cargo.toml

@@ -19,6 +19,7 @@ secp256k1 = { version = "0.17.2", features = ["serde"] }
 serde = { version = "1", features = ["serde_derive"] }
 sha2 = "0.8"
 thiserror = "1"
+x25519-dalek = "0.6"
 # ZF deps
 redjubjub = "0.1"
 ed25519-zebra = "0.2"