Rell System Library/crypto/eth_sign

eth_sign

function eth_sign(data_hash: byte_array, privkey: byte_array): (byte_array, byte_array, integer)

Compute an Ethereum signature.

The given 32-byte array data_hash is typically a cryptographic hash obtained from a larger data structure using a hashing function such as hash(), sha256() or keccak256().

The public key corresponding to the given private key can be computed from the original value of data_hash and the returned signature tuple (r, s, rec_id) using the eth_ecrecover() method:

val (r, s, rec_id) = eth_sign(data_hash, privkey);
val pubkey = eth_ecrecover(r, s, rec_id, data_hash);
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The returned signature component rec_id is an adjusted recovery identifier, equivalent to Ethereum's recovery identifier (usually denoted as v) minus 27, i.e. rec_id == v - 27.

Return

a tuple containing the signature components:

  • r, the first 32 bytes of the signature

  • s, the second 32 bytes of the signature

  • rec_id, the adjusted recovery identifier (usually 0 or 1)

Since

0.10.6

Parameters

data_hash

a 32-byte array to be signed

privkey

the 32-byte private key with which to sign