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Additional externs for ecdsa recovery and keccak (#1583)

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* Additional externs for ecdsa recovery and keccak

* Update core/executor/src/wasm_executor.rs

Co-Authored-By: gavofyork <github@gavwood.com>

* Update core/executor/src/wasm_executor.rs

Co-Authored-By: gavofyork <github@gavwood.com>

* Fix grumble

* Grumble.
This commit is contained in:
Gav Wood
2019-01-25 19:07:02 +00:00
committed by GitHub
parent 5ddcbe0ca6
commit c132e84572
14 changed files with 441 additions and 7 deletions
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substrate/core/sr-io/with_std.rs
+16
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@@ -24,10 +24,14 @@ extern crate substrate_state_machine;
extern crate substrate_trie as trie;
extern crate hash_db;
extern crate tiny_keccak;
extern crate secp256k1;
#[doc(hidden)]
pub extern crate parity_codec as codec;
// re-export hashing functions.
pub use primitives::{blake2_256, twox_128, twox_256, ed25519};
pub use tiny_keccak::keccak256 as keccak_256;
pub use primitives::{Blake2Hasher};
// Switch to this after PoC-3
@@ -200,6 +204,18 @@ pub fn ed25519_verify<P: AsRef<[u8]>>(sig: &[u8; 64], msg: &[u8], pubkey: P) ->
ed25519::verify(sig, msg, pubkey)
}
/// Verify and recover a SECP256k1 ECDSA signature.
/// - `sig` is passed in RSV format. V should be either 0/1 or 27/28.
/// - returns `Err` if the signatue is bad, otherwise the 64-byte pubkey (doesn't include the 0x04 prefix).
pub fn secp256k1_ecdsa_recover(sig: &[u8; 65], msg: &[u8; 32]) -> Result<[u8; 64], EcdsaVerifyError> {
let rs = secp256k1::Signature::parse_slice(&sig[0..64]).map_err(|_| EcdsaVerifyError::BadRS)?;
let v = secp256k1::RecoveryId::parse(if sig[64] > 26 { sig[64] - 27 } else { sig[64] } as u8).map_err(|_| EcdsaVerifyError::BadV)?;
let pubkey = secp256k1::recover(&secp256k1::Message::parse(msg), &rs, &v).map_err(|_| EcdsaVerifyError::BadSignature)?;
let mut res = [0u8; 64];
res.copy_from_slice(&pubkey.serialize()[1..65]);
Ok(res)
}
/// Execute the given closure with global function available whose functionality routes into the
/// externalities `ext`. Forwards the value that the closure returns.
// NOTE: need a concrete hasher here due to limitations of the `environmental!` macro, otherwise a type param would have been fine I think.