feat(signer): ethereum implementation

Cargo.toml

@@ -110,6 +110,8 @@ 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 }
@@ -148,13 +150,16 @@ 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 }
+ethaddr = { version = "0.2.2", default-features = false }
 
 [profile.dev.package.smoldot-light]
 opt-level = 2

signer/Cargo.toml

@@ -15,7 +15,7 @@ description = "Sign extrinsics to be submitted by Subxt"
 keywords = ["parity", "subxt", "extrinsic", "signer"]
 
 [features]
-default = ["sr25519", "ecdsa", "subxt", "std"]
+default = ["sr25519", "ecdsa", "eth", "subxt", "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
@@ -24,6 +24,7 @@ std = ["regex/std", "sp-crypto-hashing/std", "pbkdf2/std", "sha2/std", "hmac/std
 # https://github.com/rust-bitcoin/rust-bitcoin/issues/930#issuecomment-1215538699
 sr25519 = ["schnorrkel"]
 ecdsa = ["secp256k1"]
+eth = ["keccak-hash", "secp256k1", "bip32", "ethaddr"]
 
 # Make the keypair algorithms here compatible with Subxt's Signer trait,
 # so that they can be used to sign transactions for compatible chains.
@@ -47,15 +48,19 @@ 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 }
+ethaddr = { 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]