feat(signer): ethereum implementation (#1501)

---------

Co-authored-by: James Wilson <[email protected]>

.github/workflows/rust.yml

@@ -189,6 +189,7 @@ jobs:
           cargo check -p subxt-signer
           cargo check -p subxt-signer --no-default-features --features sr25519
           cargo check -p subxt-signer --no-default-features --features ecdsa
+          cargo check -p subxt-signer --no-default-features --features unstable-eth
 
       # We can't enable web features here, so no cargo hack.
       - name: Cargo check subxt-lightclient

Cargo.toml

@@ -111,6 +111,8 @@ wabt = "0.10.0"
 wasm-bindgen-test = "0.3.24"
 which = "5.0.0"
 strip-ansi-escapes = "0.2.0"
+proptest = "1.4.0"
+hex-literal = "0.4.1"
 
 # Light client support:
 smoldot = { version = "0.16.0", default-features = false }
@@ -149,10 +151,12 @@ substrate-runner = { path = "testing/substrate-runner" }
 
 # subxt-signer deps that I expect aren't useful anywhere else:
 bip39 = { version = "2.0.0", default-features = false }
+bip32 = { version = "0.5.1", default-features = false }
 hmac = { version = "0.12.1", default-features = false }
 pbkdf2 = { version = "0.12.2", default-features = false }
 schnorrkel = { version = "0.11.4", default-features = false }
 secp256k1 = { version = "0.28.2", default-features = false }
+keccak-hash = { version = "0.10.0", default-features = false }
 secrecy = "0.8.0"
 sha2 = { version = "0.10.8", default-features = false }
 zeroize = { version = "1", default-features = false }

signer/Cargo.toml

@@ -16,14 +16,25 @@ keywords = ["parity", "subxt", "extrinsic", "signer"]
 
 [features]
 default = ["sr25519", "ecdsa", "subxt", "std"]
-std = ["regex/std", "sp-crypto-hashing/std", "pbkdf2/std", "sha2/std", "hmac/std", "bip39/std", "schnorrkel/std", "secp256k1/std", "sp-core/std"]
+std = [
+    "regex/std",
+    "sp-crypto-hashing/std",
+    "pbkdf2/std",
+    "sha2/std",
+    "hmac/std",
+    "bip39/std",
+    "schnorrkel/std",
+    "secp256k1/std",
+    "sp-core/std"
+]
 
 # Pick the signer implementation(s) you need by enabling the
 # corresponding features. Note: I had more difficulties getting
 # ecdsa compiling to WASM on my mac; following this comment helped:
 # https://github.com/rust-bitcoin/rust-bitcoin/issues/930#issuecomment-1215538699
 sr25519 = ["schnorrkel"]
 ecdsa = ["secp256k1"]
+unstable-eth = ["keccak-hash", "ecdsa", "secp256k1", "bip32"]
 
 # Make the keypair algorithms here compatible with Subxt's Signer trait,
 # so that they can be used to sign transactions for compatible chains.
@@ -37,7 +48,7 @@ web = ["getrandom/js"]
 subxt-core = { workspace = true, optional = true, default-features = false }
 secrecy = { workspace = true }
 regex = { workspace = true, features = ["unicode"] }
-hex = { workspace = true }
+hex = { workspace = true, features = ["alloc"] }
 cfg-if = { workspace = true }
 codec = { package = "parity-scale-codec", workspace = true, features = ["derive"] }
 sp-crypto-hashing = { workspace = true }
@@ -47,15 +58,18 @@ sha2 = { workspace = true }
 hmac = { workspace = true }
 zeroize = { workspace = true }
 bip39 = { workspace = true }
+bip32 = { workspace = true, features = ["alloc", "secp256k1"], optional = true }
 schnorrkel = { workspace = true, optional = true }
 secp256k1 = { workspace = true, optional = true, features = ["alloc", "recovery"] }
-
+keccak-hash = { workspace = true, optional = true }
 
 # We only pull this in to enable the JS flag for schnorrkel to use.
 getrandom = { workspace = true, optional = true }
 
 [dev-dependencies]
 sp-keyring = { workspace = true }
+proptest = { workspace = true }
+hex-literal = { workspace = true }
 sp-core = { workspace = true }
 
 [package.metadata.cargo-machete]