I cloned the Parity repo, built everything, and Parity is running, but I can't figure out how to run ethkey.
To compile it from source, use:
cargo build --release -p ethkey --features=ethkey-cli
in the root Parity directory and for usage instructions:
Full documentation for the Ethereum key generator and signer.
Looking for key management? Use
cargo build --release -p ethstore --features=ethstore-cli