Namespace definitions

Calculate Ethererum public key from a signature and a hash.

Does almost the same as the Solidity ecrecover(...) function, but isn't its strict equivalent.

How this function differs from the Solidity one:

• takes rec_id instead of v, where rec_id = v - 27

• other parameters (r, s, hash) are the same, but in a different order

• returns a 64-byte public key, not a 20-byte address; the address is the last 20 bytes of keccak256(...) of the public key

Derives a 20-byte Ethereum address from a 32-byte private key.

Derives a 20-byte Ethereum address from a public key (33, 64, or 65 bytes).

Calculates an Ethereum signature. Takes a hash and a private key and returns values r, s, and rec_id that are accepted by eth_ecrecover.

Calculates a ECDSA (secp256k1) signature. The returned value can be verified with the verify_signature() function.

Calculates a Keccak256 hash of a byte array and returns a byte array.

Converts a privkey to a pubkey

Converts a public key between compressed (33-byte) and uncompressed (65-byte) formats.

Extracts the EC point coordinates (x, y) from a public key.

Calculates an SHA-256 hash of a byte array and returns a byte array.

Verifies a signature against a message and public key.

Constructs a public key (compressed or uncompressed) from EC point coordinates.