ECPair.fromPrivateKey constructor
Creates a keypair from privateKey
Implementation
factory ECPair.fromPrivateKey(Uint8List privateKey, {Network network, bool compressed}) {
if (privateKey.length != 32)
throw ArgumentError(
"Expected property privateKey of type Buffer(Length: 32)");
if (!ecc.isPrivate(privateKey))
throw ArgumentError("Private key not in range [1, n)");
return ECPair(privateKey, null,
network: network, compressed: compressed);
}